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/*
* Copyright 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
package org.webrtc;
import java.util.HashMap;
import java.util.Map;
// Java-side of androidmetrics.cc
//
// Rtc histograms can be queried through the API, getAndReset().
// The returned map holds the name of a histogram and its samples.
//
// Example of `map` with one histogram:
// `name`: "WebRTC.Video.InputFramesPerSecond"
// `min`: 1
// `max`: 100
// `bucketCount`: 50
// `samples`: [30]:1
//
// Most histograms are not updated frequently (e.g. most video metrics are an
// average over the call and recorded when a stream is removed).
// The metrics can for example be retrieved when a peer connection is closed.
public class Metrics {
private static final String TAG = "Metrics";
public final Map<String, HistogramInfo> map =
new HashMap<String, HistogramInfo>(); // <name, HistogramInfo>
@CalledByNative
Metrics() {}
/**
* Class holding histogram information.
*/
public static class HistogramInfo {
public final int min;
public final int max;
public final int bucketCount;
public final Map<Integer, Integer> samples =
new HashMap<Integer, Integer>(); // <value, # of events>
@CalledByNative("HistogramInfo")
public HistogramInfo(int min, int max, int bucketCount) {
this.min = min;
this.max = max;
this.bucketCount = bucketCount;
}
@CalledByNative("HistogramInfo")
public void addSample(int value, int numEvents) {
samples.put(value, numEvents);
}
}
@CalledByNative
private void add(String name, HistogramInfo info) {
map.put(name, info);
}
// Enables gathering of metrics (which can be fetched with getAndReset()).
// Must be called before PeerConnectionFactory is created.
public static void enable() {
nativeEnable();
}
// Gets and clears native histograms.
public static Metrics getAndReset() {
return nativeGetAndReset();
}
private static native void nativeEnable();
private static native Metrics nativeGetAndReset();
}
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