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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; 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.os.SystemClock;
import android.util.Log;
import org.mozilla.gecko.annotation.WrapForJNI;
/**
* All telemetry times are relative to one of two clocks:
*
* <p>* Real time since the device was booted, including deep sleep. Use this as a substitute for
* wall clock. * Uptime since the device was booted, excluding deep sleep. Use this to avoid timing
* a user activity when their phone is in their pocket!
*
* <p>The majority of methods in this class are defined in terms of real time.
*/
public class TelemetryUtils {
private static final String LOGTAG = "TelemetryUtils";
@WrapForJNI(stubName = "AddHistogram", dispatchTo = "gecko")
private static native void nativeAddHistogram(String name, int value);
public static long uptime() {
return SystemClock.uptimeMillis();
}
public static long realtime() {
return SystemClock.elapsedRealtime();
}
// Define new histograms in:
// toolkit/components/telemetry/Histograms.json
public static void addToHistogram(final String name, final int value) {
if (GeckoThread.isRunning()) {
nativeAddHistogram(name, value);
} else {
GeckoThread.queueNativeCall(
TelemetryUtils.class, "nativeAddHistogram", String.class, name, value);
}
}
public abstract static class Timer {
private final long mStartTime;
private final String mName;
private volatile boolean mHasFinished;
private volatile long mElapsed = -1;
protected abstract long now();
public Timer(final String name) {
mName = name;
mStartTime = now();
}
public void cancel() {
mHasFinished = true;
}
public long getElapsed() {
return mElapsed;
}
public void stop() {
// Only the first stop counts.
if (mHasFinished) {
return;
}
mHasFinished = true;
final long elapsed = now() - mStartTime;
if (elapsed < 0) {
Log.e(LOGTAG, "Current time less than start time -- clock shenanigans?");
return;
}
mElapsed = elapsed;
if (elapsed > Integer.MAX_VALUE) {
Log.e(LOGTAG, "Duration of " + elapsed + "ms is too great to add to histogram.");
return;
}
addToHistogram(mName, (int) (elapsed));
}
}
public static class UptimeTimer extends Timer {
public UptimeTimer(final String name) {
super(name);
}
@Override
protected long now() {
return TelemetryUtils.uptime();
}
}
}
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