Lots of refactoring, add tps command

29 files changed, 798 insertions, 320 deletions

diff --git a/spark-common/src/main/java/me/lucko/spark/common/SparkPlatform.java b/spark-common/src/main/java/me/lucko/spark/common/SparkPlatform.java
index ef21d1c..8eb4565 100644
--- a/spark-common/src/main/java/me/lucko/spark/common/SparkPlatform.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/SparkPlatform.java
@@ -21,19 +21,20 @@
 package me.lucko.spark.common;
 
 import com.google.common.collect.ImmutableList;
-
 import me.lucko.spark.common.command.Arguments;
 import me.lucko.spark.common.command.Command;
+import me.lucko.spark.common.command.CommandResponseHandler;
 import me.lucko.spark.common.command.modules.MemoryModule;
+import me.lucko.spark.common.command.modules.MonitoringModule;
 import me.lucko.spark.common.command.modules.SamplerModule;
 import me.lucko.spark.common.command.modules.TickMonitoringModule;
 import me.lucko.spark.common.command.tabcomplete.CompletionSupplier;
 import me.lucko.spark.common.command.tabcomplete.TabCompleter;
-import me.lucko.spark.sampler.ThreadDumper;
-import me.lucko.spark.sampler.TickCounter;
-import me.lucko.spark.util.BytebinClient;
+import me.lucko.spark.common.monitor.tick.TpsCalculator;
+import me.lucko.spark.common.sampler.TickCounter;
+import me.lucko.spark.common.util.BytebinClient;
+import okhttp3.OkHttpClient;
 
-import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -41,52 +42,68 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 /**
- * Abstract command handling class used by all platforms.
+ * Abstract spark implementation used by all platforms.
  *
  * @param <S> the sender (e.g. CommandSender) type used by the platform
  */
-public abstract class SparkPlatform<S> {
+public class SparkPlatform<S> {
 
     /** The URL of the viewer frontend */
     public static final String VIEWER_URL = "https://sparkprofiler.github.io/#";
+    /** The shared okhttp client */
+    private static final OkHttpClient OK_HTTP_CLIENT = new OkHttpClient();
     /** The bytebin instance used by the platform */
-    public static final BytebinClient BYTEBIN_CLIENT = new BytebinClient("https://bytebin.lucko.me/", "spark-plugin");
-
-    /** The prefix used in all messages */
-    private static final String PREFIX = "&8[&fspark&8] &7";
-    
-    private static <T> List<Command<T>> prepareCommands() {
-        ImmutableList.Builder<Command<T>> builder = ImmutableList.builder();
-        new SamplerModule<T>().registerCommands(builder::add);
-        new TickMonitoringModule<T>().registerCommands(builder::add);
-        new MemoryModule<T>().registerCommands(builder::add);
-        return builder.build();
+    public static final BytebinClient BYTEBIN_CLIENT = new BytebinClient(OK_HTTP_CLIENT, "https://bytebin.lucko.me/", "spark-plugin");
+
+    private final List<Command<S>> commands;
+    private final SparkPlugin<S> plugin;
+
+    private final TickCounter tickCounter;
+    private final TpsCalculator tpsCalculator;
+
+    public SparkPlatform(SparkPlugin<S> plugin) {
+        this.plugin = plugin;
+
+        ImmutableList.Builder<Command<S>> commandsBuilder = ImmutableList.builder();
+        new SamplerModule<S>().registerCommands(commandsBuilder::add);
+        new MonitoringModule<S>().registerCommands(commandsBuilder::add);
+        new TickMonitoringModule<S>().registerCommands(commandsBuilder::add);
+        new MemoryModule<S>().registerCommands(commandsBuilder::add);
+        this.commands = commandsBuilder.build();
+
+        this.tickCounter = plugin.createTickCounter();
+        this.tpsCalculator = this.tickCounter != null ? new TpsCalculator() : null;
+    }
+
+    public void enable() {
+        if (this.tickCounter != null) {
+            this.tickCounter.addTickTask(this.tpsCalculator);
+            this.tickCounter.start();
+        }
+    }
+
+    public void disable() {
+        if (this.tickCounter != null) {
+            this.tickCounter.close();
+        }
+    }
+
+    public SparkPlugin<S> getPlugin() {
+        return this.plugin;
     }
 
-    private final List<Command<S>> commands = prepareCommands();
-    
-    // abstract methods implemented by each platform
-    public abstract String getVersion();
-    public abstract Path getPluginFolder();
-    public abstract String getLabel();
-    public abstract void sendMessage(S sender, String message);
-    public abstract void sendMessage(String message);
-    public abstract void sendLink(String url);
-    public abstract void runAsync(Runnable r);
-    public abstract ThreadDumper getDefaultThreadDumper();
-    public abstract TickCounter newTickCounter();
-
-    public void sendPrefixedMessage(S sender, String message) {
-        sendMessage(sender, PREFIX + message);
+    public TickCounter getTickCounter() {
+        return this.tickCounter;
     }
 
-    public void sendPrefixedMessage(String message) {
-        sendMessage(PREFIX + message);
+    public TpsCalculator getTpsCalculator() {
+        return this.tpsCalculator;
     }
 
     public void executeCommand(S sender, String[] args) {
+        CommandResponseHandler<S> resp = new CommandResponseHandler<>(this, sender);
         if (args.length == 0) {
-            sendUsage(sender);
+            sendUsage(resp);
             return;
         }
 
@@ -96,15 +113,15 @@ public abstract class SparkPlatform<S> {
         for (Command<S> command : this.commands) {
             if (command.aliases().contains(alias)) {
                 try {
-                    command.executor().execute(this, sender, new Arguments(rawArgs));
+                    command.executor().execute(this, sender, resp, new Arguments(rawArgs));
                 } catch (IllegalArgumentException e) {
-                    sendMessage(sender, "&c" + e.getMessage());
+                    resp.replyPrefixed("&c" + e.getMessage());
                 }
                 return;
             }
         }
 
-        sendUsage(sender);
+        sendUsage(resp);
     }
 
     public List<String> tabCompleteCommand(S sender, String[] args) {
@@ -127,15 +144,15 @@ public abstract class SparkPlatform<S> {
         return Collections.emptyList();
     }
 
-    private void sendUsage(S sender) {
-        sendPrefixedMessage(sender, "&fspark &7v" + getVersion());
+    private void sendUsage(CommandResponseHandler<S> sender) {
+        sender.replyPrefixed("&fspark &7v" + getPlugin().getVersion());
         for (Command<S> command : this.commands) {
-            sendMessage(sender, "&b&l> &7/" + getLabel() + " " + command.aliases().get(0));
+            sender.reply("&b&l> &7/" + getPlugin().getLabel() + " " + command.aliases().get(0));
             for (Command.ArgumentInfo arg : command.arguments()) {
                 if (arg.requiresParameter()) {
-                    sendMessage(sender, "       &8[&7--" + arg.argumentName() + "&8 <" + arg.parameterDescription() + ">]");
+                    sender.reply("       &8[&7--" + arg.argumentName() + "&8 <" + arg.parameterDescription() + ">]");
                 } else {
-                    sendMessage(sender, "       &8[&7--" + arg.argumentName() + "]");
+                    sender.reply("       &8[&7--" + arg.argumentName() + "]");
                 }
             }
         }
diff --git a/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java b/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java
new file mode 100644
index 0000000..7a3a353
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/SparkPlugin.java
@@ -0,0 +1,49 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common;
+
+import me.lucko.spark.common.sampler.ThreadDumper;
+import me.lucko.spark.common.sampler.TickCounter;
+
+import java.nio.file.Path;
+import java.util.Set;
+
+public interface SparkPlugin<S> {
+
+    String getVersion();
+
+    Path getPluginFolder();
+
+    String getLabel();
+
+    Set<S> getSenders();
+
+    void sendMessage(S sender, String message);
+
+    void sendLink(S sender, String url);
+
+    void runAsync(Runnable r);
+
+    ThreadDumper getDefaultThreadDumper();
+
+    TickCounter createTickCounter();
+
+}
diff --git a/spark-common/src/main/java/me/lucko/spark/common/command/Command.java b/spark-common/src/main/java/me/lucko/spark/common/command/Command.java
index fb440b1..c9f6551 100644
--- a/spark-common/src/main/java/me/lucko/spark/common/command/Command.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/command/Command.java
@@ -21,7 +21,6 @@
 package me.lucko.spark.common.command;
 
 import com.google.common.collect.ImmutableList;
-
 import me.lucko.spark.common.SparkPlatform;
 
 import java.util.Collections;
@@ -109,7 +108,7 @@ public class Command<S> {
 
     @FunctionalInterface
     public interface Executor<S> {
-        void execute(SparkPlatform<S> platform, S sender, Arguments arguments);
+        void execute(SparkPlatform<S> platform, S sender, CommandResponseHandler resp, Arguments arguments);
     }
 
     @FunctionalInterface
diff --git a/spark-common/src/main/java/me/lucko/spark/common/command/CommandResponseHandler.java b/spark-common/src/main/java/me/lucko/spark/common/command/CommandResponseHandler.java
new file mode 100644
index 0000000..a5a7391
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/command/CommandResponseHandler.java
@@ -0,0 +1,75 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.command;
+
+import me.lucko.spark.common.SparkPlatform;
+
+import java.util.Set;
+import java.util.function.Consumer;
+
+public class CommandResponseHandler<S> {
+
+    /** The prefix used in all messages */
+    private static final String PREFIX = "&8[&fspark&8] &7";
+
+    private final SparkPlatform<S> platform;
+    private final S sender;
+
+    public CommandResponseHandler(SparkPlatform<S> platform, S sender) {
+        this.platform = platform;
+        this.sender = sender;
+    }
+
+    public S sender() {
+        return this.sender;
+    }
+
+    public void allSenders(Consumer<? super S> action) {
+        Set<S> senders = this.platform.getPlugin().getSenders();
+        senders.add(this.sender);
+        senders.forEach(action);
+    }
+
+    public void reply(String message) {
+        this.platform.getPlugin().sendMessage(this.sender, message);
+    }
+
+    public void broadcast(String message) {
+        allSenders(sender -> this.platform.getPlugin().sendMessage(sender, message));
+    }
+
+    public void replyPrefixed(String message) {
+        this.platform.getPlugin().sendMessage(this.sender, PREFIX + message);
+    }
+
+    public void broadcastPrefixed(String message) {
+        allSenders(sender -> this.platform.getPlugin().sendMessage(sender, PREFIX + message));
+    }
+
+    public void replyLink(String link) {
+        this.platform.getPlugin().sendLink(this.sender, link);
+    }
+
+    public void broadcastLink(String link) {
+        allSenders(sender -> this.platform.getPlugin().sendLink(sender, link));
+    }
+
+}
diff --git a/spark-common/src/main/java/me/lucko/spark/common/command/modules/MemoryModule.java b/spark-common/src/main/java/me/lucko/spark/common/command/modules/MemoryModule.java
index 5f17d54..2cb2e07 100644
--- a/spark-common/src/main/java/me/lucko/spark/common/command/modules/MemoryModule.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/command/modules/MemoryModule.java
@@ -24,9 +24,8 @@ import me.lucko.spark.common.SparkPlatform;
 import me.lucko.spark.common.command.Command;
 import me.lucko.spark.common.command.CommandModule;
 import me.lucko.spark.common.command.tabcomplete.TabCompleter;
-import me.lucko.spark.memory.HeapDump;
-import me.lucko.spark.memory.HeapDumpSummary;
-
+import me.lucko.spark.common.memory.HeapDump;
+import me.lucko.spark.common.memory.HeapDumpSummary;
 import okhttp3.MediaType;
 
 import java.io.IOException;
@@ -44,34 +43,34 @@ public class MemoryModule<S> implements CommandModule<S> {
         consumer.accept(Command.<S>builder()
                 .aliases("heapsummary")
                 .argumentUsage("run-gc-before", null)
-                .executor((platform, sender, arguments) -> {
-                    platform.runAsync(() -> {
-                        if (arguments.boolFlag("run-gc-before")) {
-                            platform.sendPrefixedMessage("&7Running garbage collector...");
-                            System.gc();
-                        }
-
-                        platform.sendPrefixedMessage("&7Creating a new heap dump summary, please wait...");
-
-                        HeapDumpSummary heapDump;
-                        try {
-                            heapDump = HeapDumpSummary.createNew();
-                        } catch (Exception e) {
-                            platform.sendPrefixedMessage("&cAn error occurred whilst inspecting the heap.");
-                            e.printStackTrace();
-                            return;
-                        }
-
-                        byte[] output = heapDump.formCompressedDataPayload();
-                        try {
-                            String key = SparkPlatform.BYTEBIN_CLIENT.postGzippedContent(output, JSON_TYPE);
-                            platform.sendPrefixedMessage("&bHeap dump summmary output:");
-                            platform.sendLink(SparkPlatform.VIEWER_URL + key);
-                        } catch (IOException e) {
-                            platform.sendPrefixedMessage("&cAn error occurred whilst uploading the data.");
-                            e.printStackTrace();
-                        }
-                    });
+                .executor((platform, sender, resp, arguments) -> {
+                    platform.getPlugin().runAsync(() -> {
+                                    if (arguments.boolFlag("run-gc-before")) {
+                                        resp.broadcastPrefixed("&7Running garbage collector...");
+                                        System.gc();
+                                    }
+
+                                    resp.broadcastPrefixed("&7Creating a new heap dump summary, please wait...");
+
+                                    HeapDumpSummary heapDump;
+                                    try {
+                                        heapDump = HeapDumpSummary.createNew();
+                                    } catch (Exception e) {
+                                        resp.broadcastPrefixed("&cAn error occurred whilst inspecting the heap.");
+                                        e.printStackTrace();
+                                        return;
+                                    }
+
+                                    byte[] output = heapDump.formCompressedDataPayload();
+                                    try {
+                                        String key = SparkPlatform.BYTEBIN_CLIENT.postContent(output, JSON_TYPE, false).key();
+                                        resp.broadcastPrefixed("&bHeap dump summmary output:");
+                                        resp.broadcastLink(SparkPlatform.VIEWER_URL + key);
+                                    } catch (IOException e) {
+                                        resp.broadcastPrefixed("&cAn error occurred whilst uploading the data.");
+                                        e.printStackTrace();
+                                    }
+                                });
                 })
                 .tabCompleter((platform, sender, arguments) -> TabCompleter.completeForOpts(arguments, "--run-gc-before"))
                 .build()
@@ -81,35 +80,36 @@ public class MemoryModule<S> implements CommandModule<S> {
                 .aliases("heapdump")
                 .argumentUsage("run-gc-before", null)
                 .argumentUsage("include-non-live", null)
-                .executor((platform, sender, arguments) -> {
-                    platform.runAsync(() -> {
-                        Path pluginFolder = platform.getPluginFolder();
-                        try {
-                            Files.createDirectories(pluginFolder);
-                        } catch (IOException e) {
-                            // ignore
-                        }
-
-                        Path file = pluginFolder.resolve("heap-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now()) + (HeapDump.isOpenJ9() ? ".phd" : ".hprof"));
-                        boolean liveOnly = !arguments.boolFlag("include-non-live");
-
-                        if (arguments.boolFlag("run-gc-before")) {
-                            platform.sendPrefixedMessage("&7Running garbage collector...");
-                            System.gc();
-                        }
-
-                        platform.sendPrefixedMessage("&7Creating a new heap dump, please wait...");
-
-                        try {
-                            HeapDump.dumpHeap(file, liveOnly);
-                        } catch (Exception e) {
-                            platform.sendPrefixedMessage("&cAn error occurred whilst creating a heap dump.");
-                            e.printStackTrace();
-                            return;
-                        }
-
-                        platform.sendPrefixedMessage("&bHeap dump written to: " + file.toString());
-                    });
+                .executor((platform, sender, resp, arguments) -> {
+                    // ignore
+                    platform.getPlugin().runAsync(() -> {
+                                    Path pluginFolder = platform.getPlugin().getPluginFolder();
+                                    try {
+                                        Files.createDirectories(pluginFolder);
+                                    } catch (IOException e) {
+                                        // ignore
+                                    }
+
+                                    Path file = pluginFolder.resolve("heap-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now()) + (HeapDump.isOpenJ9() ? ".phd" : ".hprof"));
+                                    boolean liveOnly = !arguments.boolFlag("include-non-live");
+
+                                    if (arguments.boolFlag("run-gc-before")) {
+                                        resp.broadcastPrefixed("&7Running garbage collector...");
+                                        System.gc();
+                                    }
+
+                                    resp.broadcastPrefixed("&7Creating a new heap dump, please wait...");
+
+                                    try {
+                                        HeapDump.dumpHeap(file, liveOnly);
+                                    } catch (Exception e) {
+                                        resp.broadcastPrefixed("&cAn error occurred whilst creating a heap dump.");
+                                        e.printStackTrace();
+                                        return;
+                                    }
+
+                                    resp.broadcastPrefixed("&bHeap dump written to: " + file.toString());
+                                });
                 })
                 .tabCompleter((platform, sender, arguments) -> TabCompleter.completeForOpts(arguments, "--run-gc-before", "--include-non-live"))
                 .build()
diff --git a/spark-common/src/main/java/me/lucko/spark/common/command/modules/MonitoringModule.java b/spark-common/src/main/java/me/lucko/spark/common/command/modules/MonitoringModule.java
new file mode 100644
index 0000000..b543e1d
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/command/modules/MonitoringModule.java
@@ -0,0 +1,51 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.command.modules;
+
+import me.lucko.spark.common.command.Command;
+import me.lucko.spark.common.command.CommandModule;
+import me.lucko.spark.common.monitor.tick.TpsCalculator;
+
+import java.util.function.Consumer;
+
+public class MonitoringModule<S> implements CommandModule<S> {
+
+    @Override
+    public void registerCommands(Consumer<Command<S>> consumer) {
+        consumer.accept(Command.<S>builder()
+                .aliases("tps")
+                .executor((platform, sender, resp, arguments) -> {
+                    TpsCalculator tpsCalculator = platform.getTpsCalculator();
+                    if (tpsCalculator == null) {
+                        resp.replyPrefixed("TPS data is not available.");
+                        return;
+                    }
+
+                    String formattedTpsString = tpsCalculator.toFormattedString();
+                    resp.replyPrefixed("TPS from last 5s, 10s, 1m, 5m, 15m");
+                    resp.replyPrefixed(formattedTpsString);
+                })
+                .tabCompleter(Command.TabCompleter.empty())
+                .build()
+        );
+    }
+
+}
diff --git a/spark-common/src/main/java/me/lucko/spark/common/command/modules/SamplerModule.java b/spark-common/src/main/java/me/lucko/spark/common/command/modules/SamplerModule.java
index 9d00a96..a0f171c 100644
--- a/spark-common/src/main/java/me/lucko/spark/common/command/modules/SamplerModule.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/command/modules/SamplerModule.java
@@ -23,14 +23,14 @@ package me.lucko.spark.common.command.modules;
 import me.lucko.spark.common.SparkPlatform;
 import me.lucko.spark.common.command.Command;
 import me.lucko.spark.common.command.CommandModule;
+import me.lucko.spark.common.command.CommandResponseHandler;
 import me.lucko.spark.common.command.tabcomplete.CompletionSupplier;
 import me.lucko.spark.common.command.tabcomplete.TabCompleter;
-import me.lucko.spark.sampler.Sampler;
-import me.lucko.spark.sampler.SamplerBuilder;
-import me.lucko.spark.sampler.ThreadDumper;
-import me.lucko.spark.sampler.ThreadGrouper;
-import me.lucko.spark.sampler.TickCounter;
-
+import me.lucko.spark.common.sampler.Sampler;
+import me.lucko.spark.common.sampler.SamplerBuilder;
+import me.lucko.spark.common.sampler.ThreadDumper;
+import me.lucko.spark.common.sampler.ThreadGrouper;
+import me.lucko.spark.common.sampler.TickCounter;
 import okhttp3.MediaType;
 
 import java.io.IOException;
@@ -62,15 +62,15 @@ public class SamplerModule<S> implements CommandModule<S> {
                 .argumentUsage("interval", "interval millis")
                 .argumentUsage("only-ticks-over", "tick length millis")
                 .argumentUsage("include-line-numbers", null)
-                .executor((platform, sender, arguments) -> {
+                .executor((platform, sender, resp, arguments) -> {
                     int timeoutSeconds = arguments.intFlag("timeout");
                     if (timeoutSeconds != -1 && timeoutSeconds <= 10) {
-                        platform.sendPrefixedMessage(sender, "&cThe specified timeout is not long enough for accurate results to be formed. Please choose a value greater than 10.");
+                        resp.replyPrefixed("&cThe specified timeout is not long enough for accurate results to be formed. Please choose a value greater than 10.");
                         return;
                     }
 
                     if (timeoutSeconds != -1 && timeoutSeconds < 30) {
-                        platform.sendPrefixedMessage(sender, "&7The accuracy of the output will significantly improve when sampling is able to run for longer periods. Consider setting a timeout value over 30 seconds.");
+                        resp.replyPrefixed("&7The accuracy of the output will significantly improve when sampling is able to run for longer periods. Consider setting a timeout value over 30 seconds.");
                     }
 
                     double intervalMillis = arguments.doubleFlag("interval");
@@ -84,7 +84,7 @@ public class SamplerModule<S> implements CommandModule<S> {
                     ThreadDumper threadDumper;
                     if (threads.isEmpty()) {
                         // use the server thread
-                        threadDumper = platform.getDefaultThreadDumper();
+                        threadDumper = platform.getPlugin().getDefaultThreadDumper();
                     } else if (threads.contains("*")) {
                         threadDumper = ThreadDumper.ALL;
                     } else {
@@ -108,10 +108,9 @@ public class SamplerModule<S> implements CommandModule<S> {
                     int ticksOver = arguments.intFlag("only-ticks-over");
                     TickCounter tickCounter = null;
                     if (ticksOver != -1) {
-                        try {
-                            tickCounter = platform.newTickCounter();
-                        } catch (UnsupportedOperationException e) {
-                            platform.sendPrefixedMessage(sender, "&cTick counting is not supported!");
+                        tickCounter = platform.getTickCounter();
+                        if (tickCounter == null) {
+                            resp.replyPrefixed("&cTick counting is not supported!");
                             return;
                         }
                     }
@@ -119,11 +118,11 @@ public class SamplerModule<S> implements CommandModule<S> {
                     Sampler sampler;
                     synchronized (this.activeSamplerMutex) {
                         if (this.activeSampler != null) {
-                            platform.sendPrefixedMessage(sender, "&7An active sampler is already running.");
+                            resp.replyPrefixed("&7An active sampler is already running.");
                             return;
                         }
 
-                        platform.sendPrefixedMessage("&7Initializing a new profiler, please wait...");
+                        resp.broadcastPrefixed("&7Initializing a new profiler, please wait...");
 
                         SamplerBuilder builder = new SamplerBuilder();
                         builder.threadDumper(threadDumper);
@@ -138,11 +137,11 @@ public class SamplerModule<S> implements CommandModule<S> {
                         }
                         sampler = this.activeSampler = builder.start();
 
-                        platform.sendPrefixedMessage("&bProfiler now active!");
+                        resp.broadcastPrefixed("&bProfiler now active!");
                         if (timeoutSeconds == -1) {
-                            platform.sendPrefixedMessage("&7Use '/" + platform.getLabel() + " stop' to stop profiling and upload the results.");
+                            resp.broadcastPrefixed("&7Use '/" + platform.getPlugin().getLabel() + " stop' to stop profiling and upload the results.");
                         } else {
-                            platform.sendPrefixedMessage("&7The results will be automatically returned after the profiler has been running for " + timeoutSeconds + " seconds.");
+                            resp.broadcastPrefixed("&7The results will be automatically returned after the profiler has been running for " + timeoutSeconds + " seconds.");
                         }
                     }
 
@@ -151,7 +150,7 @@ public class SamplerModule<S> implements CommandModule<S> {
                     // send message if profiling fails
                     future.whenCompleteAsync((s, throwable) -> {
                         if (throwable != null) {
-                            platform.sendPrefixedMessage("&cSampling operation failed unexpectedly. Error: " + throwable.toString());
+                            resp.broadcastPrefixed("&cSampling operation failed unexpectedly. Error: " + throwable.toString());
                             throwable.printStackTrace();
                         }
                     });
@@ -168,8 +167,8 @@ public class SamplerModule<S> implements CommandModule<S> {
                     // await the result
                     if (timeoutSeconds != -1) {
                         future.thenAcceptAsync(s -> {
-                            platform.sendPrefixedMessage("&7The active sampling operation has completed! Uploading results...");
-                            handleUpload(platform, s);
+                            resp.broadcastPrefixed("&7The active sampling operation has completed! Uploading results...");
+                            handleUpload(platform, resp, s);
                         });
                     }
                 })
@@ -188,21 +187,21 @@ public class SamplerModule<S> implements CommandModule<S> {
 
         consumer.accept(Command.<S>builder()
                 .aliases("info")
-                .executor((platform, sender, arguments) -> {
+                .executor((platform, sender, resp, arguments) -> {
                     synchronized (this.activeSamplerMutex) {
                         if (this.activeSampler == null) {
-                            platform.sendPrefixedMessage(sender, "&7There isn't an active sampling task running.");
+                            resp.replyPrefixed("&7There isn't an active sampling task running.");
                         } else {
                             long timeout = this.activeSampler.getEndTime();
                             if (timeout == -1) {
-                                platform.sendPrefixedMessage(sender, "&7There is an active sampler currently running, with no defined timeout.");
+                                resp.replyPrefixed("&7There is an active sampler currently running, with no defined timeout.");
                             } else {
                                 long timeoutDiff = (timeout - System.currentTimeMillis()) / 1000L;
-                                platform.sendPrefixedMessage(sender, "&7There is an active sampler currently running, due to timeout in " + timeoutDiff + " seconds.");
+                                resp.replyPrefixed("&7There is an active sampler currently running, due to timeout in " + timeoutDiff + " seconds.");
                             }
 
                             long runningTime = (System.currentTimeMillis() - this.activeSampler.getStartTime()) / 1000L;
-                            platform.sendPrefixedMessage(sender, "&7It has been sampling for " + runningTime + " seconds so far.");
+                            resp.replyPrefixed("&7It has been sampling for " + runningTime + " seconds so far.");
                         }
                     }
                 })
@@ -211,14 +210,14 @@ public class SamplerModule<S> implements CommandModule<S> {
 
         consumer.accept(Command.<S>builder()
                 .aliases("stop", "upload", "paste")
-                .executor((platform, sender, arguments) -> {
+                .executor((platform, sender, resp, arguments) -> {
                     synchronized (this.activeSamplerMutex) {
                         if (this.activeSampler == null) {
-                            platform.sendPrefixedMessage(sender, "&7There isn't an active sampling task running.");
+                            resp.replyPrefixed("&7There isn't an active sampling task running.");
                         } else {
                             this.activeSampler.cancel();
-                            platform.sendPrefixedMessage("&7The active sampling operation has been stopped! Uploading results...");
-                            handleUpload(platform, this.activeSampler);
+                            resp.broadcastPrefixed("&7The active sampling operation has been stopped! Uploading results...");
+                            handleUpload(platform, resp, this.activeSampler);
                             this.activeSampler = null;
                         }
                     }
@@ -228,14 +227,14 @@ public class SamplerModule<S> implements CommandModule<S> {
 
         consumer.accept(Command.<S>builder()
                 .aliases("cancel")
-                .executor((platform, sender, arguments) -> {
+                .executor((platform, sender, resp, arguments) -> {
                     synchronized (this.activeSamplerMutex) {
                         if (this.activeSampler == null) {
-                            platform.sendPrefixedMessage(sender, "&7There isn't an active sampling task running.");
+                            resp.replyPrefixed("&7There isn't an active sampling task running.");
                         } else {
                             this.activeSampler.cancel();
                             this.activeSampler = null;
-                            platform.sendPrefixedMessage("&bThe active sampling task has been cancelled.");
+                            resp.broadcastPrefixed("&bThe active sampling task has been cancelled.");
                         }
                     }
                 })
@@ -243,15 +242,15 @@ public class SamplerModule<S> implements CommandModule<S> {
         );
     }
 
-    private void handleUpload(SparkPlatform<S> platform, Sampler sampler) {
-        platform.runAsync(() -> {
+    private void handleUpload(SparkPlatform<S> platform, CommandResponseHandler<S> resp, Sampler sampler) {
+        platform.getPlugin().runAsync(() -> {
             byte[] output = sampler.formCompressedDataPayload();
             try {
-                String key = SparkPlatform.BYTEBIN_CLIENT.postGzippedContent(output, JSON_TYPE);
-                platform.sendPrefixedMessage("&bSampling results:");
-                platform.sendLink(SparkPlatform.VIEWER_URL + key);
+                String key = SparkPlatform.BYTEBIN_CLIENT.postContent(output, JSON_TYPE, false).key();
+                resp.broadcastPrefixed("&bSampling results:");
+                resp.broadcastLink(SparkPlatform.VIEWER_URL + key);
             } catch (IOException e) {
-                platform.sendPrefixedMessage("&cAn error occurred whilst uploading the results.");
+                resp.broadcastPrefixed("&cAn error occurred whilst uploading the results.");
                 e.printStackTrace();
             }
         });
diff --git a/spark-common/src/main/java/me/lucko/spark/common/command/modules/TickMonitoringModule.java b/spark-common/src/main/java/me/lucko/spark/common/command/modules/TickMonitoringModule.java
index 3ad8909..bea7a07 100644
--- a/spark-common/src/main/java/me/lucko/spark/common/command/modules/TickMonitoringModule.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/command/modules/TickMonitoringModule.java
@@ -20,12 +20,12 @@
 
 package me.lucko.spark.common.command.modules;
 
-import me.lucko.spark.common.SparkPlatform;
 import me.lucko.spark.common.command.Command;
 import me.lucko.spark.common.command.CommandModule;
+import me.lucko.spark.common.command.CommandResponseHandler;
 import me.lucko.spark.common.command.tabcomplete.TabCompleter;
-import me.lucko.spark.monitor.TickMonitor;
-import me.lucko.spark.sampler.TickCounter;
+import me.lucko.spark.common.monitor.tick.TickMonitor;
+import me.lucko.spark.common.sampler.TickCounter;
 
 import java.util.function.Consumer;
 
@@ -37,27 +37,29 @@ public class TickMonitoringModule<S> implements CommandModule<S> {
     @Override
     public void registerCommands(Consumer<Command<S>> consumer) {
         consumer.accept(Command.<S>builder()
-                .aliases("monitoring")
+                .aliases("tickmonitoring")
                 .argumentUsage("threshold", "percentage increase")
                 .argumentUsage("without-gc", null)
-                .executor((platform, sender, arguments) -> {
-                    if (this.activeTickMonitor == null) {
+                .executor((platform, sender, resp, arguments) -> {
+                    TickCounter tickCounter = platform.getTickCounter();
+                    if (tickCounter == null) {
+                        resp.replyPrefixed("&cNot supported!");
+                        return;
+                    }
 
+                    if (this.activeTickMonitor == null) {
                         int threshold = arguments.intFlag("threshold");
                         if (threshold == -1) {
                             threshold = 100;
                         }
 
-                        try {
-                            TickCounter tickCounter = platform.newTickCounter();
-                            this.activeTickMonitor = new ReportingTickMonitor(platform, tickCounter, threshold, !arguments.boolFlag("without-gc"));
-                        } catch (UnsupportedOperationException e) {
-                            platform.sendPrefixedMessage(sender, "&cNot supported!");
-                        }
+                        this.activeTickMonitor = new ReportingTickMonitor(resp, tickCounter, threshold, !arguments.boolFlag("without-gc"));
+                        tickCounter.addTickTask(this.activeTickMonitor);
                     } else {
+                        tickCounter.removeTickTask(this.activeTickMonitor);
                         this.activeTickMonitor.close();
                         this.activeTickMonitor = null;
-                        platform.sendPrefixedMessage("&7Tick monitor disabled.");
+                        resp.broadcastPrefixed("&7Tick monitor disabled.");
                     }
                 })
                 .tabCompleter((platform, sender, arguments) -> TabCompleter.completeForOpts(arguments, "--threshold", "--without-gc"))
@@ -66,16 +68,16 @@ public class TickMonitoringModule<S> implements CommandModule<S> {
     }
 
     private class ReportingTickMonitor extends TickMonitor {
-        private final SparkPlatform<S> platform;
+        private final CommandResponseHandler<S> resp;
 
-        ReportingTickMonitor(SparkPlatform<S> platform, TickCounter tickCounter, int percentageChangeThreshold, boolean monitorGc) {
+        ReportingTickMonitor(CommandResponseHandler<S> resp, TickCounter tickCounter, int percentageChangeThreshold, boolean monitorGc) {
             super(tickCounter, percentageChangeThreshold, monitorGc);
-            this.platform = platform;
+            this.resp = resp;
         }
 
         @Override
         protected void sendMessage(String message) {
-            this.platform.sendPrefixedMessage(message);
+            this.resp.broadcastPrefixed(message);
         }
     }
 }
diff --git a/spark-common/src/main/java/me/lucko/spark/memory/HeapDump.java b/spark-common/src/main/java/me/lucko/spark/common/memory/HeapDump.java
index 4017d64..6200c17 100644
--- a/spark-common/src/main/java/me/lucko/spark/memory/HeapDump.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/memory/HeapDump.java
@@ -18,17 +18,16 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.memory;
+package me.lucko.spark.common.memory;
 
+import javax.management.JMX;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
 import java.io.IOException;
 import java.lang.management.ManagementFactory;
 import java.lang.reflect.Method;
 import java.nio.file.Path;
 
-import javax.management.JMX;
-import javax.management.MBeanServer;
-import javax.management.ObjectName;
-
 /**
  * Utility for creating .hprof memory heap snapshots.
  */
diff --git a/spark-common/src/main/java/me/lucko/spark/memory/HeapDumpSummary.java b/spark-common/src/main/java/me/lucko/spark/common/memory/HeapDumpSummary.java
index 402b89e..f3f62db 100644
--- a/spark-common/src/main/java/me/lucko/spark/memory/HeapDumpSummary.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/memory/HeapDumpSummary.java
@@ -18,12 +18,14 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.memory;
+package me.lucko.spark.common.memory;
 
 import com.google.gson.stream.JsonWriter;
+import me.lucko.spark.common.util.TypeDescriptors;
 
-import me.lucko.spark.util.TypeDescriptors;
-
+import javax.management.JMX;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
@@ -38,10 +40,6 @@ import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 import java.util.zip.GZIPOutputStream;
 
-import javax.management.JMX;
-import javax.management.MBeanServer;
-import javax.management.ObjectName;
-
 /**
  * Represents a "heap dump summary" from the VM.
  *
diff --git a/spark-common/src/main/java/me/lucko/spark/monitor/GarbageCollectionMonitor.java b/spark-common/src/main/java/me/lucko/spark/common/monitor/gc/GarbageCollectionMonitor.java
index 906ca07..93a5fd8 100644
--- a/spark-common/src/main/java/me/lucko/spark/monitor/GarbageCollectionMonitor.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/monitor/gc/GarbageCollectionMonitor.java
@@ -18,29 +18,26 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.monitor;
+package me.lucko.spark.common.monitor.gc;
 
 import com.sun.management.GarbageCollectionNotificationInfo;
 
-import java.lang.management.GarbageCollectorMXBean;
-import java.lang.management.ManagementFactory;
-import java.util.ArrayList;
-import java.util.List;
-
 import javax.management.ListenerNotFoundException;
 import javax.management.Notification;
 import javax.management.NotificationEmitter;
 import javax.management.NotificationListener;
 import javax.management.openmbean.CompositeData;
+import java.lang.management.GarbageCollectorMXBean;
+import java.lang.management.ManagementFactory;
+import java.util.ArrayList;
+import java.util.List;
 
 public class GarbageCollectionMonitor implements NotificationListener, AutoCloseable {
 
-    private final TickMonitor tickMonitor;
+    private final List<Listener> listeners = new ArrayList<>();
     private final List<NotificationEmitter> emitters = new ArrayList<>();
 
-    public GarbageCollectionMonitor(TickMonitor tickMonitor) {
-        this.tickMonitor = tickMonitor;
-
+    public GarbageCollectionMonitor() {
         List<GarbageCollectorMXBean> beans = ManagementFactory.getGarbageCollectorMXBeans();
         for (GarbageCollectorMXBean bean : beans) {
             if (!(bean instanceof NotificationEmitter)) {
@@ -53,6 +50,14 @@ public class GarbageCollectionMonitor implements NotificationListener, AutoClose
         }
     }
 
+    public void addListener(Listener listener) {
+        this.listeners.add(listener);
+    }
+
+    public void removeListener(Listener listener) {
+        this.listeners.remove(listener);
+    }
+
     @Override
     public void handleNotification(Notification notification, Object handback) {
         if (!notification.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION)) {
@@ -60,7 +65,9 @@ public class GarbageCollectionMonitor implements NotificationListener, AutoClose
         }
 
         GarbageCollectionNotificationInfo data = GarbageCollectionNotificationInfo.from((CompositeData) notification.getUserData());
-        this.tickMonitor.onGc(data);
+        for (Listener listener : this.listeners) {
+            listener.onGc(data);
+        }
     }
 
     @Override
@@ -73,5 +80,11 @@ public class GarbageCollectionMonitor implements NotificationListener, AutoClose
             }
         }
         this.emitters.clear();
+        this.listeners.clear();
+    }
+
+    public interface Listener {
+        void onGc(GarbageCollectionNotificationInfo data);
     }
+
 }
diff --git a/spark-common/src/main/java/me/lucko/spark/monitor/TickMonitor.java b/spark-common/src/main/java/me/lucko/spark/common/monitor/tick/TickMonitor.java
index abb6148..034e876 100644
--- a/spark-common/src/main/java/me/lucko/spark/monitor/TickMonitor.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/monitor/tick/TickMonitor.java
@@ -18,16 +18,16 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.monitor;
+package me.lucko.spark.common.monitor.tick;
 
 import com.sun.management.GarbageCollectionNotificationInfo;
-
-import me.lucko.spark.sampler.TickCounter;
+import me.lucko.spark.common.monitor.gc.GarbageCollectionMonitor;
+import me.lucko.spark.common.sampler.TickCounter;
 
 import java.text.DecimalFormat;
 import java.util.DoubleSummaryStatistics;
 
-public abstract class TickMonitor implements Runnable, AutoCloseable {
+public abstract class TickMonitor implements TickCounter.TickTask, GarbageCollectionMonitor.Listener, AutoCloseable {
     private static final DecimalFormat df = new DecimalFormat("#.##");
 
     private final TickCounter tickCounter;
@@ -44,24 +44,25 @@ public abstract class TickMonitor implements Runnable, AutoCloseable {
         this.tickCounter = tickCounter;
         this.percentageChangeThreshold = percentageChangeThreshold;
 
-        this.tickCounter.start();
-        this.tickCounter.addTickTask(this);
-
-        this.garbageCollectionMonitor = monitorGc ? new GarbageCollectionMonitor(this) : null;
+        if (monitorGc) {
+            this.garbageCollectionMonitor =  new GarbageCollectionMonitor();
+            this.garbageCollectionMonitor.addListener(this);
+        } else {
+            this.garbageCollectionMonitor = null;
+        }
     }
 
     protected abstract void sendMessage(String message);
 
     @Override
     public void close() {
-        this.tickCounter.close();
         if (this.garbageCollectionMonitor != null) {
             this.garbageCollectionMonitor.close();
         }
     }
 
     @Override
-    public void run() {
+    public void onTick(TickCounter counter) {
         double now = ((double) System.nanoTime()) / 1000000d;
 
         // init
@@ -110,13 +111,14 @@ public abstract class TickMonitor implements Runnable, AutoCloseable {
 
             double percentageChange = (increase * 100d) / this.avg;
             if (percentageChange > this.percentageChangeThreshold) {
-                sendMessage("&7Tick &8#" + this.tickCounter.getCurrentTick() + " &7lasted &b" + df.format(diff) +
+                sendMessage("&7Tick &8#" + counter.getCurrentTick() + " &7lasted &b" + df.format(diff) +
                         "&7 ms. (&b" + df.format(percentageChange) + "% &7increase from average)");
             }
         }
     }
 
-    void onGc(GarbageCollectionNotificationInfo data) {
+    @Override
+    public void onGc(GarbageCollectionNotificationInfo data) {
         if (this.state == State.SETUP) {
             // set lastTickTime to zero so this tick won't be counted in the average
             this.lastTickTime = 0;
diff --git a/spark-common/src/main/java/me/lucko/spark/common/monitor/tick/TpsCalculator.java b/spark-common/src/main/java/me/lucko/spark/common/monitor/tick/TpsCalculator.java
new file mode 100644
index 0000000..2f3af3e
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/monitor/tick/TpsCalculator.java
@@ -0,0 +1,170 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.monitor.tick;
+
+import me.lucko.spark.common.sampler.TickCounter;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Calculates the servers TPS (ticks per second) rate.
+ *
+ * <p>The code use to calculate the TPS is the same as the code used by the Minecraft server itself.
+ * This means that this class will output values the same as the /tps command.</p>
+ *
+ * <p>We calculate our own values instead of pulling them from the server for two reasons. Firstly,
+ * it's easier - pulling from the server requires reflection code on each of the platforms, we'd
+ * rather avoid that. Secondly, it allows us to generate rolling averages over a shorter period of
+ * time.</p>
+ */
+public class TpsCalculator implements TickCounter.TickTask {
+
+    private static final long SEC_IN_NANO = TimeUnit.SECONDS.toNanos(1);
+    private static final int TPS = 20;
+    private static final int SAMPLE_INTERVAL = 20;
+    private static final BigDecimal TPS_BASE = new BigDecimal(SEC_IN_NANO).multiply(new BigDecimal((long) SAMPLE_INTERVAL));
+
+    private final RollingAverage tps5S = new RollingAverage(5);
+    private final RollingAverage tps10S = new RollingAverage(10);
+    private final RollingAverage tps1M = new RollingAverage(60);
+    private final RollingAverage tps5M = new RollingAverage(60 * 5);
+    private final RollingAverage tps15M = new RollingAverage(60 * 15);
+
+    private final RollingAverage[] averages = new RollingAverage[]{
+            this.tps5S, this.tps10S, this.tps1M, this.tps5M, this.tps15M
+    };
+
+    private long last = 0;
+
+    // called every tick
+    @Override
+    public void onTick(TickCounter counter) {
+        if (counter.getCurrentTick() % SAMPLE_INTERVAL != 0) {
+            return;
+        }
+
+        long now = System.nanoTime();
+
+        if (this.last == 0) {
+            this.last = now;
+            return;
+        }
+
+        long diff = now - this.last;
+        BigDecimal currentTps = TPS_BASE.divide(new BigDecimal(diff), 30, RoundingMode.HALF_UP);
+
+        for (RollingAverage rollingAverage : this.averages) {
+            rollingAverage.add(currentTps, diff);
+        }
+
+        this.last = now;
+    }
+
+    public RollingAverage avg5Sec() {
+        return this.tps5S;
+    }
+
+    public RollingAverage avg10Sec() {
+        return this.tps10S;
+    }
+
+    public RollingAverage avg1Min() {
+        return this.tps1M;
+    }
+
+    public RollingAverage avg5Min() {
+        return this.tps5M;
+    }
+
+    public RollingAverage avg15Min() {
+        return this.tps15M;
+    }
+
+    public String toFormattedString() {
+        return formatTps(this.tps5S.getAverage()) + ", " +
+                formatTps(this.tps10S.getAverage()) + ", " +
+                formatTps(this.tps1M.getAverage()) + ", " +
+                formatTps(this.tps5M.getAverage()) + ", " +
+                formatTps(this.tps15M.getAverage());
+    }
+
+    public static String formatTps(double tps) {
+        StringBuilder sb = new StringBuilder();
+        if (tps > 18.0) {
+            sb.append("&a");
+        } else if (tps > 16.0) {
+            sb.append("&e");
+        } else {
+            sb.append("&c");
+        }
+        if (tps > 20.0) {
+            sb.append('*');
+        }
+        return sb.append(Math.min(Math.round(tps * 100.0) / 100.0, 20.0)).toString();
+    }
+
+    /**
+     * Rolling average calculator taken.
+     *
+     * <p>This code is taken from PaperMC/Paper, licensed under MIT.</p>
+     *
+     * @author aikar (PaperMC) https://github.com/PaperMC/Paper/blob/master/Spigot-Server-Patches/0021-Further-improve-server-tick-loop.patch
+     */
+    public static final class RollingAverage {
+        private final int size;
+        private long time;
+        private BigDecimal total;
+        private int index = 0;
+        private final BigDecimal[] samples;
+        private final long[] times;
+
+        RollingAverage(int size) {
+            this.size = size;
+            this.time = size * SEC_IN_NANO;
+            this.total = new BigDecimal((long) TPS).multiply(new BigDecimal(SEC_IN_NANO)).multiply(new BigDecimal((long) size));
+            this.samples = new BigDecimal[size];
+            this.times = new long[size];
+            for (int i = 0; i < size; i++) {
+                this.samples[i] = new BigDecimal((long) TPS);
+                this.times[i] = SEC_IN_NANO;
+            }
+        }
+
+        public void add(BigDecimal x, long t) {
+            this.time -= this.times[this.index];
+            this.total = this.total.subtract(this.samples[this.index].multiply(new BigDecimal(this.times[this.index])));
+            this.samples[this.index] = x;
+            this.times[this.index] = t;
+            this.time += t;
+            this.total = this.total.add(x.multiply(new BigDecimal(t)));
+            if (++this.index == this.size) {
+                this.index = 0;
+            }
+        }
+
+        public double getAverage() {
+            return this.total.divide(new BigDecimal(this.time), 30, RoundingMode.HALF_UP).doubleValue();
+        }
+    }
+
+}
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/Sampler.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/Sampler.java
index 6777770..d504247 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/Sampler.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/Sampler.java
@@ -19,15 +19,14 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler;
+package me.lucko.spark.common.sampler;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import com.google.gson.stream.JsonWriter;
-
-import me.lucko.spark.sampler.aggregator.DataAggregator;
-import me.lucko.spark.sampler.aggregator.SimpleDataAggregator;
-import me.lucko.spark.sampler.aggregator.TickedDataAggregator;
-import me.lucko.spark.sampler.node.ThreadNode;
+import me.lucko.spark.common.sampler.aggregator.DataAggregator;
+import me.lucko.spark.common.sampler.aggregator.SimpleDataAggregator;
+import me.lucko.spark.common.sampler.aggregator.TickedDataAggregator;
+import me.lucko.spark.common.sampler.node.ThreadNode;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/SamplerBuilder.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/SamplerBuilder.java
index bf9dc04..4ce69df 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/SamplerBuilder.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/SamplerBuilder.java
@@ -18,7 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler;
+package me.lucko.spark.common.sampler;
 
 import java.util.concurrent.TimeUnit;
 
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/ThreadDumper.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/ThreadDumper.java
index 5b68eaf..14938ac 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/ThreadDumper.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/ThreadDumper.java
@@ -19,9 +19,9 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler;
+package me.lucko.spark.common.sampler;
 
-import me.lucko.spark.util.ThreadFinder;
+import me.lucko.spark.common.util.ThreadFinder;
 
 import java.lang.management.ThreadInfo;
 import java.lang.management.ThreadMXBean;
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/ThreadGrouper.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/ThreadGrouper.java
index 3f1be33..f53800a 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/ThreadGrouper.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/ThreadGrouper.java
@@ -18,7 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler;
+package me.lucko.spark.common.sampler;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/TickCounter.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/TickCounter.java
index 059e420..aa839ba 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/TickCounter.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/TickCounter.java
@@ -18,7 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler;
+package me.lucko.spark.common.sampler;
 
 /**
  * A hook with the game's "tick loop".
@@ -48,13 +48,17 @@ public interface TickCounter extends AutoCloseable {
      *
      * @param runnable the task
      */
-    void addTickTask(Runnable runnable);
+    void addTickTask(TickTask runnable);
 
     /**
      * Removes a tick task
      *
      * @param runnable the task
      */
-    void removeTickTask(Runnable runnable);
+    void removeTickTask(TickTask runnable);
+
+    interface TickTask {
+        void onTick(TickCounter counter);
+    }
 
 }
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/aggregator/DataAggregator.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/aggregator/DataAggregator.java
index 0e38eb4..8c65c2d 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/aggregator/DataAggregator.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/aggregator/DataAggregator.java
@@ -18,9 +18,9 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler.aggregator;
+package me.lucko.spark.common.sampler.aggregator;
 
-import me.lucko.spark.sampler.node.ThreadNode;
+import me.lucko.spark.common.sampler.node.ThreadNode;
 
 import java.util.Map;
 
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/aggregator/SimpleDataAggregator.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/aggregator/SimpleDataAggregator.java
index a72b47f..8fbd03f 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/aggregator/SimpleDataAggregator.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/aggregator/SimpleDataAggregator.java
@@ -18,11 +18,11 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler.aggregator;
+package me.lucko.spark.common.sampler.aggregator;
 
-import me.lucko.spark.sampler.ThreadGrouper;
-import me.lucko.spark.sampler.node.AbstractNode;
-import me.lucko.spark.sampler.node.ThreadNode;
+import me.lucko.spark.common.sampler.ThreadGrouper;
+import me.lucko.spark.common.sampler.node.AbstractNode;
+import me.lucko.spark.common.sampler.node.ThreadNode;
 
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/aggregator/TickedDataAggregator.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/aggregator/TickedDataAggregator.java
index ef568c8..8f8124b 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/aggregator/TickedDataAggregator.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/aggregator/TickedDataAggregator.java
@@ -18,12 +18,12 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler.aggregator;
+package me.lucko.spark.common.sampler.aggregator;
 
-import me.lucko.spark.sampler.ThreadGrouper;
-import me.lucko.spark.sampler.TickCounter;
-import me.lucko.spark.sampler.node.AbstractNode;
-import me.lucko.spark.sampler.node.ThreadNode;
+import me.lucko.spark.common.sampler.ThreadGrouper;
+import me.lucko.spark.common.sampler.TickCounter;
+import me.lucko.spark.common.sampler.node.AbstractNode;
+import me.lucko.spark.common.sampler.node.ThreadNode;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/node/AbstractNode.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/node/AbstractNode.java
index 859014f..5cfc0f2 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/node/AbstractNode.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/node/AbstractNode.java
@@ -19,7 +19,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler.node;
+package me.lucko.spark.common.sampler.node;
 
 import com.google.gson.stream.JsonWriter;
 
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/node/StackTraceNode.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/node/StackTraceNode.java
index 8cbcd0f..c4e7ac4 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/node/StackTraceNode.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/node/StackTraceNode.java
@@ -19,7 +19,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler.node;
+package me.lucko.spark.common.sampler.node;
 
 import com.google.gson.stream.JsonWriter;
 
diff --git a/spark-common/src/main/java/me/lucko/spark/sampler/node/ThreadNode.java b/spark-common/src/main/java/me/lucko/spark/common/sampler/node/ThreadNode.java
index 2acce21..4e8714c 100644
--- a/spark-common/src/main/java/me/lucko/spark/sampler/node/ThreadNode.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/sampler/node/ThreadNode.java
@@ -18,7 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.sampler.node;
+package me.lucko.spark.common.sampler.node;
 
 import com.google.gson.stream.JsonWriter;
 
diff --git a/spark-common/src/main/java/me/lucko/spark/common/util/AbstractHttpClient.java b/spark-common/src/main/java/me/lucko/spark/common/util/AbstractHttpClient.java
new file mode 100644
index 0000000..1ff169d
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/AbstractHttpClient.java
@@ -0,0 +1,45 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.util;
+
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+import java.io.IOException;
+
+public class AbstractHttpClient {
+
+    /** The http client */
+    protected final OkHttpClient okHttp;
+
+    public AbstractHttpClient(OkHttpClient okHttp) {
+        this.okHttp = okHttp;
+    }
+
+    protected Response makeHttpRequest(Request request) throws IOException {
+        Response response = this.okHttp.newCall(request).execute();
+        if (!response.isSuccessful()) {
+            throw new RuntimeException("Request was unsuccessful: " + response.code() + " - " + response.message());
+        }
+        return response;
+    }
+}
diff --git a/spark-common/src/main/java/me/lucko/spark/common/util/BytebinClient.java b/spark-common/src/main/java/me/lucko/spark/common/util/BytebinClient.java
new file mode 100644
index 0000000..ff8f4e3
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/BytebinClient.java
@@ -0,0 +1,149 @@
+/*
+ * This file is part of bytebin, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package me.lucko.spark.common.util;
+
+import okhttp3.MediaType;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+import java.io.IOException;
+
+/**
+ * Utility for posting content to bytebin.
+ */
+public class BytebinClient extends AbstractHttpClient {
+
+    /** The bytebin URL */
+    private final String url;
+    /** The client user agent */
+    private final String userAgent;
+
+    /**
+     * Creates a new bytebin instance
+     *
+     * @param url the bytebin url
+     * @param userAgent the client user agent string
+     */
+    public BytebinClient(OkHttpClient okHttpClient, String url, String userAgent) {
+        super(okHttpClient);
+        if (url.endsWith("/")) {
+            this.url = url;
+        } else {
+            this.url = url + "/";
+        }
+        this.userAgent = userAgent;
+    }
+
+    /**
+     * POSTs GZIP compressed content to bytebin.
+     *
+     * @param buf the compressed content
+     * @param contentType the type of the content
+     * @param allowModification if the paste should be modifiable
+     * @return the key of the resultant content
+     * @throws IOException if an error occurs
+     */
+    public Content postContent(byte[] buf, MediaType contentType, boolean allowModification) throws IOException {
+        RequestBody body = RequestBody.create(contentType, buf);
+
+        Request.Builder requestBuilder = new Request.Builder()
+                .url(this.url + "post")
+                .header("User-Agent", this.userAgent)
+                .header("Content-Encoding", "gzip");
+
+        if (allowModification) {
+            requestBuilder.header("Allow-Modification", "true");
+        }
+
+        Request request = requestBuilder.post(body).build();
+        try (Response response = makeHttpRequest(request)) {
+            String key = response.header("Location");
+            if (key == null) {
+                throw new IllegalStateException("Key not returned");
+            }
+
+            if (allowModification) {
+                String modificationKey = response.header("Modification-Key");
+                if (modificationKey == null) {
+                    throw new IllegalStateException("Modification key not returned");
+                }
+                return new Content(key, modificationKey);
+            } else {
+                return new Content(key);
+            }
+        }
+    }
+
+    /**
+     * PUTs modified GZIP compressed content to bytebin in place of existing content.
+     *
+     * @param existingContent the existing content
+     * @param buf the compressed content to put
+     * @param contentType the type of the content
+     * @throws IOException if an error occurs
+     */
+    public void modifyContent(Content existingContent, byte[] buf, MediaType contentType) throws IOException {
+        if (!existingContent.modifiable) {
+            throw new IllegalArgumentException("Existing content is not modifiable");
+        }
+
+        RequestBody body = RequestBody.create(contentType, buf);
+
+        Request.Builder requestBuilder = new Request.Builder()
+                .url(this.url + existingContent.key())
+                .header("User-Agent", this.userAgent)
+                .header("Content-Encoding", "gzip")
+                .header("Modification-Key", existingContent.modificationKey);
+
+        Request request = requestBuilder.put(body).build();
+        makeHttpRequest(request).close();
+    }
+
+    public static final class Content {
+        private final String key;
+        private final boolean modifiable;
+        private final String modificationKey;
+
+        Content(String key) {
+            this.key = key;
+            this.modifiable = false;
+            this.modificationKey = null;
+        }
+
+        Content(String key, String modificationKey) {
+            this.key = key;
+            this.modifiable = true;
+            this.modificationKey = modificationKey;
+        }
+
+        public String key() {
+            return this.key;
+        }
+    }
+
+}
diff --git a/spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java b/spark-common/src/main/java/me/lucko/spark/common/util/ThreadFinder.java
index 8ba7b10..cc0722a 100644
--- a/spark-common/src/main/java/me/lucko/spark/util/ThreadFinder.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/ThreadFinder.java
@@ -18,7 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.util;
+package me.lucko.spark.common.util;
 
 import java.util.Arrays;
 import java.util.Objects;
diff --git a/spark-common/src/main/java/me/lucko/spark/util/TypeDescriptors.java b/spark-common/src/main/java/me/lucko/spark/common/util/TypeDescriptors.java
index 20dbe17..a232e77 100644
--- a/spark-common/src/main/java/me/lucko/spark/util/TypeDescriptors.java
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/TypeDescriptors.java
@@ -18,7 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package me.lucko.spark.util;
+package me.lucko.spark.common.util;
 
 /**
  * Utilities for working with Java type descriptors.
diff --git a/spark-common/src/main/java/me/lucko/spark/util/BytebinClient.java b/spark-common/src/main/java/me/lucko/spark/util/BytebinClient.java
deleted file mode 100644
index 00e1c69..0000000
--- a/spark-common/src/main/java/me/lucko/spark/util/BytebinClient.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * This file is part of bytebin, licensed under the MIT License.
- *
- *  Copyright (c) lucko (Luck) <luck@lucko.me>
- *  Copyright (c) contributors
- *
- *  Permission is hereby granted, free of charge, to any person obtaining a copy
- *  of this software and associated documentation files (the "Software"), to deal
- *  in the Software without restriction, including without limitation the rights
- *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- *  copies of the Software, and to permit persons to whom the Software is
- *  furnished to do so, subject to the following conditions:
- *
- *  The above copyright notice and this permission notice shall be included in all
- *  copies or substantial portions of the Software.
- *
- *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- *  SOFTWARE.
- */
-package me.lucko.spark.util;
-
-import okhttp3.MediaType;
-import okhttp3.OkHttpClient;
-import okhttp3.Request;
-import okhttp3.RequestBody;
-import okhttp3.Response;
-
-import java.io.IOException;
-
-/**
- * Utility for posting content to bytebin.
- */
-public class BytebinClient {
-
-    /** The bytebin URL */
-    private final String url;
-    /** The client user agent */
-    private final String userAgent;
-    /** The http client */
-    protected final OkHttpClient okHttp;
-
-    /**
-     * Creates a new bytebin instance
-     *
-     * @param url the bytebin url
-     * @param userAgent the client user agent string
-     */
-    public BytebinClient(String url, String userAgent) {
-        if (url.endsWith("/")) {
-            this.url = url + "post";
-        } else {
-            this.url = url + "/post";
-        }
-        this.userAgent = userAgent;
-        this.okHttp = new OkHttpClient();
-    }
-
-    /**
-     * Posts GZIP compressed content to bytebin.
-     *
-     * @param buf the compressed content
-     * @param contentType the type of the content
-     * @return the key of the resultant content
-     * @throws IOException if an error occurs
-     */
-    public String postGzippedContent(byte[] buf, MediaType contentType) throws IOException {
-        RequestBody body = RequestBody.create(contentType, buf);
-
-        Request.Builder requestBuilder = new Request.Builder()
-                .url(this.url)
-                .header("User-Agent", this.userAgent)
-                .header("Content-Encoding", "gzip")
-                .post(body);
-
-        Request request = requestBuilder.build();
-        try (Response response = makeHttpRequest(request)) {
-            return response.header("Location");
-        }
-    }
-
-    protected Response makeHttpRequest(Request request) throws IOException {
-        Response response = this.okHttp.newCall(request).execute();
-        if (!response.isSuccessful()) {
-            throw new RuntimeException("Request was unsuccessful: " + response.code() + " - " + response.message());
-        }
-        return response;
-    }
-}