Java tutorial
/* * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.android.net; import android.os.NetStat; import android.os.SystemClock; import android.os.SystemProperties; import android.util.EventLog; import org.apache.http.HttpEntity; import org.apache.http.entity.HttpEntityWrapper; import java.io.FilterInputStream; import java.io.IOException; import java.io.InputStream; public class NetworkStatsEntity extends HttpEntityWrapper { private static final int HTTP_STATS_EVENT = 52001; private class NetworkStatsInputStream extends FilterInputStream { public NetworkStatsInputStream(InputStream wrapped) { super(wrapped); } @Override public void close() throws IOException { try { super.close(); } finally { long processingTime = SystemClock.elapsedRealtime() - mProcessingStartTime; long tx = NetStat.getUidTxBytes(mUid); long rx = NetStat.getUidRxBytes(mUid); EventLog.writeEvent(HTTP_STATS_EVENT, mUa, mResponseLatency, processingTime, tx - mStartTx, rx - mStartRx); } } } private final String mUa; private final int mUid; private final long mStartTx; private final long mStartRx; private final long mResponseLatency; private final long mProcessingStartTime; public NetworkStatsEntity(HttpEntity orig, String ua, int uid, long startTx, long startRx, long responseLatency, long processingStartTime) { super(orig); this.mUa = ua; this.mUid = uid; this.mStartTx = startTx; this.mStartRx = startRx; this.mResponseLatency = responseLatency; this.mProcessingStartTime = processingStartTime; } public static boolean shouldLogNetworkStats() { return "1".equals(SystemProperties.get("googlehttpclient.logstats")); } @Override public InputStream getContent() throws IOException { InputStream orig = super.getContent(); return new NetworkStatsInputStream(orig); } }