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/*
* WarmRoast
* Copyright (C) 2013 Albert Pham <http://www.sk89q.com>
*
* 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.profiler;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
/**
* Main sampler class.
*/
public class Sampler extends TimerTask {
/** The thread management interface for the current JVM */
private final ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
/** A map of root stack nodes for each thread with sampling data */
private final Map<String, StackNode> threadData = new HashMap<>();
/** A set of recorded thread info that's yet to be inserted into the node structure */
private final Set<QueuedThreadInfo> pendingThreadData = Collections.synchronizedSet(Collections.newSetFromMap(new IdentityHashMap<>()));
/** The worker pool for inserting stack nodes */
private ExecutorService workerPool;
/** The lock object */
private final Object[] lock = new Object[0];
/** A future to encapsulation the completion of this sampler instance */
private final CompletableFuture<Sampler> future = new CompletableFuture<>();
/** The interval to wait between sampling, in milliseconds */
private final int interval;
/** The instance used to generate thread information for use in sampling */
private final ThreadDumper threadDumper;
/** The time when sampling first began */
private long startTime = -1;
/** The unix timestamp (in millis) when this sampler should automatically complete.*/
private final long endTime; // -1 for nothing
public Sampler(int interval, ThreadDumper threadDumper, long endTime) {
this.interval = interval;
this.threadDumper = threadDumper;
this.endTime = endTime;
}
/**
* Starts the sampler.
*
* @param samplingThread the timer to schedule the sampling on
* @param workerPool the worker pool
*/
public void start(Timer samplingThread, ExecutorService workerPool) {
this.workerPool = workerPool;
samplingThread.scheduleAtFixedRate(this, 0, this.interval);
this.startTime = System.currentTimeMillis();
}
private void insertData(QueuedThreadInfo data) {
synchronized (this.lock) {
try {
StackNode node = this.threadData.computeIfAbsent(data.threadName, StackNode::new);
node.log(data.stack, Sampler.this.interval);
this.pendingThreadData.remove(data);
} catch (Exception e) {
e.printStackTrace();
// we need to remove the pending data even if the insert failed
this.pendingThreadData.remove(data);
}
}
}
/**
* Gets the sampling data recorded by this instance.
*
* @return the data
*/
public Map<String, StackNode> getData() {
if (this.pendingThreadData.isEmpty()) {
return this.threadData;
}
// wait for all pending data to be inserted
while (true) {
synchronized (this.lock) {
if (this.pendingThreadData.isEmpty()) {
return this.threadData;
}
}
}
}
public long getStartTime() {
if (this.startTime == -1) {
throw new IllegalStateException("Not yet started");
}
return this.startTime;
}
public long getEndTime() {
return this.endTime;
}
public CompletableFuture<Sampler> getFuture() {
return this.future;
}
@Override
public void run() {
try {
if (this.endTime != -1 && this.endTime <= System.currentTimeMillis()) {
this.future.complete(this);
cancel();
return;
}
ThreadInfo[] threadDumps = this.threadDumper.dumpThreads(this.threadBean);
for (ThreadInfo threadInfo : threadDumps) {
String threadName = threadInfo.getThreadName();
StackTraceElement[] stack = threadInfo.getStackTrace();
if (threadName == null || stack == null) {
continue;
}
QueuedThreadInfo queuedData = new QueuedThreadInfo(threadName, stack);
this.pendingThreadData.add(queuedData);
this.workerPool.execute(queuedData);
}
} catch (Throwable t) {
this.future.completeExceptionally(t);
cancel();
}
}
public JsonObject formOutput() {
JsonObject out = new JsonObject();
JsonArray threads = new JsonArray();
List<Map.Entry<String, StackNode>> data = new ArrayList<>(getData().entrySet());
data.sort(Map.Entry.comparingByKey());
for (Map.Entry<String, StackNode> entry : data) {
JsonObject o = new JsonObject();
o.addProperty("threadName", entry.getKey());
o.addProperty("totalTime", entry.getValue().getTotalTime());
o.add("rootNode", entry.getValue().serialize());
threads.add(o);
}
out.add("threads", threads);
return out;
}
private final class QueuedThreadInfo implements Runnable {
private final String threadName;
private final StackTraceElement[] stack;
private QueuedThreadInfo(String threadName, StackTraceElement[] stack) {
this.threadName = threadName;
this.stack = stack;
}
@Override
public void run() {
insertData(this);
}
}
}
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