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/*
* 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.sampler;
import me.lucko.spark.common.SparkPlatform;
import me.lucko.spark.common.platform.PlatformInfo;
import me.lucko.spark.common.util.Configuration;
import java.util.logging.Level;
public class BackgroundSamplerManager {
private static final String OPTION_ENABLED = "backgroundProfiler";
private static final String OPTION_ENGINE = "backgroundProfilerEngine";
private static final String OPTION_INTERVAL = "backgroundProfilerInterval";
private static final String OPTION_THREAD_GROUPER = "backgroundProfilerThreadGrouper";
private static final String OPTION_THREAD_DUMPER = "backgroundProfilerThreadDumper";
private static final String MARKER_FAILED = "_marker_background_profiler_failed";
private final SparkPlatform platform;
private final Configuration configuration;
private final boolean enabled;
public BackgroundSamplerManager(SparkPlatform platform, Configuration configuration) {
this.platform = platform;
this.configuration = configuration;
PlatformInfo.Type type = this.platform.getPlugin().getPlatformInfo().getType();
this.enabled = type != PlatformInfo.Type.CLIENT && this.configuration.getBoolean(OPTION_ENABLED, type == PlatformInfo.Type.SERVER);
}
public void initialise() {
if (!this.enabled) {
return;
}
// are we enabling the background profiler by default for the first time?
boolean didEnableByDefault = false;
if (!this.configuration.contains(OPTION_ENABLED)) {
this.configuration.setBoolean(OPTION_ENABLED, true);
didEnableByDefault = true;
}
// did the background profiler fail to start on the previous attempt?
if (this.configuration.getBoolean(MARKER_FAILED, false)) {
this.platform.getPlugin().log(Level.WARNING, "It seems the background profiler failed to start when spark was last enabled. Sorry about that!");
this.platform.getPlugin().log(Level.WARNING, "In the future, spark will try to use the built-in Java profiling engine instead.");
this.configuration.remove(MARKER_FAILED);
this.configuration.setString(OPTION_ENGINE, "java");
this.configuration.save();
}
this.platform.getPlugin().log(Level.INFO, "Starting background profiler...");
if (didEnableByDefault) {
// set the failed marker and save before we try to start the profiler,
// then remove the marker afterwards if everything goes ok!
this.configuration.setBoolean(MARKER_FAILED, true);
this.configuration.save();
}
try {
startSampler();
if (didEnableByDefault) {
this.configuration.remove(MARKER_FAILED);
this.configuration.save();
}
} catch (Throwable e) {
e.printStackTrace();
}
}
public boolean restartBackgroundSampler() {
if (this.enabled) {
startSampler();
return true;
}
return false;
}
private void startSampler() {
boolean forceJavaEngine = this.configuration.getString(OPTION_ENGINE, "async").equals("java");
ThreadGrouper threadGrouper = ThreadGrouper.parseConfigSetting(this.configuration.getString(OPTION_THREAD_GROUPER, "by-pool"));
ThreadDumper threadDumper = ThreadDumper.parseConfigSetting(this.configuration.getString(OPTION_THREAD_DUMPER, "default"));
if (threadDumper == null) {
threadDumper = this.platform.getPlugin().getDefaultThreadDumper();
}
int interval = this.configuration.getInteger(OPTION_INTERVAL, 10);
Sampler sampler = new SamplerBuilder()
.background(true)
.threadDumper(threadDumper)
.threadGrouper(threadGrouper)
.samplingInterval(interval)
.forceJavaSampler(forceJavaEngine)
.start(this.platform);
this.platform.getSamplerContainer().setActiveSampler(sampler);
}
}
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