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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.async;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import me.lucko.spark.common.SparkPlatform;
import me.lucko.spark.common.sampler.AbstractSampler;
import me.lucko.spark.common.sampler.SamplerMode;
import me.lucko.spark.common.sampler.SamplerSettings;
import me.lucko.spark.common.sampler.window.ProfilingWindowUtils;
import me.lucko.spark.common.tick.TickHook;
import me.lucko.spark.common.util.SparkThreadFactory;
import me.lucko.spark.common.ws.ViewerSocket;
import me.lucko.spark.proto.SparkSamplerProtos.SamplerData;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.function.IntPredicate;
/**
* A sampler implementation using async-profiler.
*/
public class AsyncSampler extends AbstractSampler {
/** Function to collect and measure samples - either execution or allocation */
private final SampleCollector<?> sampleCollector;
/** Object that provides access to the async-profiler API */
private final AsyncProfilerAccess profilerAccess;
/** Responsible for aggregating and then outputting collected sampling data */
private final AsyncDataAggregator dataAggregator;
/** Mutex for the current profiler job */
private final Object[] currentJobMutex = new Object[0];
/** Current profiler job */
private AsyncProfilerJob currentJob;
/** The executor used for scheduling and management */
private ScheduledExecutorService scheduler;
/** The task to send statistics to the viewer socket */
private ScheduledFuture<?> socketStatisticsTask;
public AsyncSampler(SparkPlatform platform, SamplerSettings settings, SampleCollector<?> collector) {
super(platform, settings);
this.sampleCollector = collector;
this.profilerAccess = AsyncProfilerAccess.getInstance(platform);
this.dataAggregator = new AsyncDataAggregator(settings.threadGrouper());
this.scheduler = Executors.newSingleThreadScheduledExecutor(
new ThreadFactoryBuilder()
.setNameFormat("spark-async-sampler-worker-thread")
.setUncaughtExceptionHandler(SparkThreadFactory.EXCEPTION_HANDLER)
.build()
);
}
/**
* Starts the profiler.
*/
@Override
public void start() {
super.start();
TickHook tickHook = this.platform.getTickHook();
if (tickHook != null) {
this.windowStatisticsCollector.startCountingTicks(tickHook);
}
int window = ProfilingWindowUtils.windowNow();
AsyncProfilerJob job = this.profilerAccess.startNewProfilerJob();
job.init(this.platform, this.sampleCollector, this.threadDumper, window, this.background);
job.start();
this.windowStatisticsCollector.recordWindowStartTime(window);
this.currentJob = job;
// rotate the sampler job to put data into a new window
boolean shouldNotRotate = this.sampleCollector instanceof SampleCollector.Allocation && ((SampleCollector.Allocation) this.sampleCollector).isLiveOnly();
if (!shouldNotRotate) {
this.scheduler.scheduleAtFixedRate(
this::rotateProfilerJob,
ProfilingWindowUtils.WINDOW_SIZE_SECONDS,
ProfilingWindowUtils.WINDOW_SIZE_SECONDS,
TimeUnit.SECONDS
);
}
recordInitialGcStats();
scheduleTimeout();
}
private void rotateProfilerJob() {
try {
synchronized (this.currentJobMutex) {
AsyncProfilerJob previousJob = this.currentJob;
if (previousJob == null) {
return;
}
try {
// stop the previous job
previousJob.stop();
} catch (Exception e) {
e.printStackTrace();
}
// start a new job
int window = previousJob.getWindow() + 1;
AsyncProfilerJob newJob = this.profilerAccess.startNewProfilerJob();
newJob.init(this.platform, this.sampleCollector, this.threadDumper, window, this.background);
newJob.start();
this.windowStatisticsCollector.recordWindowStartTime(window);
this.currentJob = newJob;
// collect statistics for the previous window
try {
this.windowStatisticsCollector.measureNow(previousJob.getWindow());
} catch (Exception e) {
e.printStackTrace();
}
// aggregate the output of the previous job
previousJob.aggregate(this.dataAggregator);
// prune data older than the history size
IntPredicate predicate = ProfilingWindowUtils.keepHistoryBefore(window);
this.dataAggregator.pruneData(predicate);
this.windowStatisticsCollector.pruneStatistics(predicate);
this.scheduler.execute(this::processWindowRotate);
}
} catch (Throwable e) {
e.printStackTrace();
}
}
private void scheduleTimeout() {
if (this.autoEndTime == -1) {
return;
}
long delay = this.autoEndTime - System.currentTimeMillis();
if (delay <= 0) {
return;
}
this.scheduler.schedule(() -> {
stop(false);
this.future.complete(this);
}, delay, TimeUnit.MILLISECONDS);
}
/**
* Stops the profiler.
*/
@Override
public void stop(boolean cancelled) {
super.stop(cancelled);
synchronized (this.currentJobMutex) {
this.currentJob.stop();
if (!cancelled) {
this.windowStatisticsCollector.measureNow(this.currentJob.getWindow());
this.currentJob.aggregate(this.dataAggregator);
} else {
this.currentJob.deleteOutputFile();
}
this.currentJob = null;
}
if (this.socketStatisticsTask != null) {
this.socketStatisticsTask.cancel(false);
}
if (this.scheduler != null) {
this.scheduler.shutdown();
this.scheduler = null;
}
}
@Override
public void attachSocket(ViewerSocket socket) {
super.attachSocket(socket);
if (this.socketStatisticsTask == null) {
this.socketStatisticsTask = this.scheduler.scheduleAtFixedRate(this::sendStatisticsToSocket, 10, 10, TimeUnit.SECONDS);
}
}
@Override
public SamplerMode getMode() {
return this.sampleCollector.getMode();
}
@Override
public SamplerData toProto(SparkPlatform platform, ExportProps exportProps) {
SamplerData.Builder proto = SamplerData.newBuilder();
if (exportProps.channelInfo() != null) {
proto.setChannelInfo(exportProps.channelInfo());
}
writeMetadataToProto(proto, platform, exportProps.creator(), exportProps.comment(), this.dataAggregator);
writeDataToProto(proto, this.dataAggregator, exportProps.mergeMode().get(), exportProps.classSourceLookup().get());
return proto.build();
}
}
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