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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import android.util.Log;
import java.lang.Thread;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class GeckoJavaSampler {
private static final String LOGTAG = "JavaSampler";
private static Thread sSamplingThread = null;
private static SamplingThread sSamplingRunnable = null;
private static Thread sMainThread = null;
// Use the same timer primitive as the profiler
// to get a perfect sample syncing.
private static native double getProfilerTime();
private static class Sample {
public Frame[] mFrames;
public double mTime;
public Sample(StackTraceElement[] aStack) {
mFrames = new Frame[aStack.length];
mTime = getProfilerTime();
for (int i = 0; i < aStack.length; i++) {
mFrames[aStack.length - 1 - i] = new Frame();
mFrames[aStack.length - 1 - i].fileName = aStack[i].getFileName();
mFrames[aStack.length - 1 - i].lineNo = aStack[i].getLineNumber();
mFrames[aStack.length - 1 - i].methodName = aStack[i].getMethodName();
mFrames[aStack.length - 1 - i].className = aStack[i].getClassName();
}
}
}
private static class Frame {
public String fileName;
public int lineNo;
public String methodName;
public String className;
}
private static class SamplingThread implements Runnable {
private final int mInterval;
private final int mSampleCount;
private boolean mPauseSampler = false;
private boolean mStopSampler = false;
private Map<Integer,Sample[]> mSamples = new HashMap<Integer,Sample[]>();
private int mSamplePos;
public SamplingThread(final int aInterval, final int aSampleCount) {
// If we sample faster then 10ms we get to many missed samples
mInterval = Math.max(10, aInterval);
mSampleCount = aSampleCount;
}
public void run() {
synchronized (GeckoJavaSampler.class) {
mSamples.put(0, new Sample[mSampleCount]);
mSamplePos = 0;
// Find the main thread
Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
for (Thread t : threadSet) {
if (t.getName().compareToIgnoreCase("main") == 0) {
sMainThread = t;
break;
}
}
if (sMainThread == null) {
Log.e(LOGTAG, "Main thread not found");
return;
}
}
while (true) {
try {
Thread.sleep(mInterval);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (GeckoJavaSampler.class) {
if (!mPauseSampler) {
StackTraceElement[] bt = sMainThread.getStackTrace();
mSamples.get(0)[mSamplePos] = new Sample(bt);
mSamplePos = (mSamplePos+1) % mSamples.get(0).length;
}
if (mStopSampler) {
break;
}
}
}
}
private Sample getSample(int aThreadId, int aSampleId) {
if (aThreadId < mSamples.size() && aSampleId < mSamples.get(aThreadId).length &&
mSamples.get(aThreadId)[aSampleId] != null) {
int startPos = 0;
if (mSamples.get(aThreadId)[mSamplePos] != null) {
startPos = mSamplePos;
}
int readPos = (startPos + aSampleId) % mSamples.get(aThreadId).length;
return mSamples.get(aThreadId)[readPos];
}
return null;
}
}
public synchronized static String getThreadName(int aThreadId) {
if (aThreadId == 0 && sMainThread != null) {
return sMainThread.getName();
}
return null;
}
private synchronized static Sample getSample(int aThreadId, int aSampleId) {
return sSamplingRunnable.getSample(aThreadId, aSampleId);
}
public synchronized static double getSampleTime(int aThreadId, int aSampleId) {
Sample sample = getSample(aThreadId, aSampleId);
if (sample != null) {
System.out.println("Sample: " + sample.mTime);
return sample.mTime;
}
return 0;
}
public synchronized static String getFrameName(int aThreadId, int aSampleId, int aFrameId) {
Sample sample = getSample(aThreadId, aSampleId);
if (sample != null && aFrameId < sample.mFrames.length) {
Frame frame = sample.mFrames[aFrameId];
if (frame == null) {
return null;
}
return frame.className + "." + frame.methodName + "()";
}
return null;
}
public static void start(int aInterval, int aSamples) {
synchronized (GeckoJavaSampler.class) {
sSamplingRunnable = new SamplingThread(aInterval, aSamples);
sSamplingThread = new Thread(sSamplingRunnable, "Java Sampler");
sSamplingThread.start();
}
}
public static void pause() {
synchronized (GeckoJavaSampler.class) {
sSamplingRunnable.mPauseSampler = true;
}
}
public static void unpause() {
synchronized (GeckoJavaSampler.class) {
sSamplingRunnable.mPauseSampler = false;
}
}
public static void stop() {
synchronized (GeckoJavaSampler.class) {
if (sSamplingThread == null) {
return;
}
sSamplingRunnable.mStopSampler = true;
try {
sSamplingThread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
sSamplingThread = null;
sSamplingRunnable = null;
}
}
}
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