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/*
* Copyright (C) 2013 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.android.server.wifi;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.NetworkInfo;
import static android.net.NetworkInfo.DetailedState.CONNECTED;
import android.net.TrafficStats;
import android.net.wifi.WifiManager;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
import android.os.Handler;
import android.os.Message;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import com.android.internal.util.AsyncChannel;
/* Polls for traffic stats and notifies the clients */
final class WifiTrafficPoller {
/**
* Interval in milliseconds between polling for traffic
* statistics
*/
private static final int POLL_TRAFFIC_STATS_INTERVAL_MSECS = 1000;
private static final int ENABLE_TRAFFIC_STATS_POLL = 1;
private static final int TRAFFIC_STATS_POLL = 2;
private static final int ADD_CLIENT = 3;
private static final int REMOVE_CLIENT = 4;
private boolean mEnableTrafficStatsPoll = false;
private int mTrafficStatsPollToken = 0;
private long mTxPkts;
private long mRxPkts;
/* Tracks last reported data activity */
private int mDataActivity;
private final List<Messenger> mClients = new ArrayList<Messenger>();
// err on the side of updating at boot since screen on broadcast may be missed
// the first time
private AtomicBoolean mScreenOn = new AtomicBoolean(true);
private final TrafficHandler mTrafficHandler;
private NetworkInfo mNetworkInfo;
private final String mInterface;
WifiTrafficPoller(Context context, String iface) {
mInterface = iface;
mTrafficHandler = new TrafficHandler();
IntentFilter filter = new IntentFilter();
filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_SCREEN_ON);
context.registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(
WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
mNetworkInfo = (NetworkInfo) intent.getParcelableExtra(
WifiManager.EXTRA_NETWORK_INFO);
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
mScreenOn.set(false);
} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
mScreenOn.set(true);
}
evaluateTrafficStatsPolling();
}
}, filter);
}
void addClient(Messenger client) {
Message.obtain(mTrafficHandler, ADD_CLIENT, client).sendToTarget();
}
void removeClient(Messenger client) {
Message.obtain(mTrafficHandler, REMOVE_CLIENT, client).sendToTarget();
}
private class TrafficHandler extends Handler {
public void handleMessage(Message msg) {
switch (msg.what) {
case ENABLE_TRAFFIC_STATS_POLL:
mEnableTrafficStatsPoll = (msg.arg1 == 1);
mTrafficStatsPollToken++;
if (mEnableTrafficStatsPoll) {
notifyOnDataActivity();
sendMessageDelayed(Message.obtain(this, TRAFFIC_STATS_POLL,
mTrafficStatsPollToken, 0), POLL_TRAFFIC_STATS_INTERVAL_MSECS);
}
break;
case TRAFFIC_STATS_POLL:
if (msg.arg1 == mTrafficStatsPollToken) {
notifyOnDataActivity();
sendMessageDelayed(Message.obtain(this, TRAFFIC_STATS_POLL,
mTrafficStatsPollToken, 0), POLL_TRAFFIC_STATS_INTERVAL_MSECS);
}
break;
case ADD_CLIENT:
mClients.add((Messenger) msg.obj);
break;
case REMOVE_CLIENT:
mClients.remove(msg.obj);
break;
}
}
}
private void evaluateTrafficStatsPolling() {
Message msg;
if (mNetworkInfo == null) return;
if (mNetworkInfo.getDetailedState() == CONNECTED && mScreenOn.get()) {
msg = Message.obtain(mTrafficHandler,
ENABLE_TRAFFIC_STATS_POLL, 1, 0);
} else {
msg = Message.obtain(mTrafficHandler,
ENABLE_TRAFFIC_STATS_POLL, 0, 0);
}
msg.sendToTarget();
}
private void notifyOnDataActivity() {
long sent, received;
long preTxPkts = mTxPkts, preRxPkts = mRxPkts;
int dataActivity = WifiManager.DATA_ACTIVITY_NONE;
mTxPkts = TrafficStats.getTxPackets(mInterface);
mRxPkts = TrafficStats.getRxPackets(mInterface);
if (preTxPkts > 0 || preRxPkts > 0) {
sent = mTxPkts - preTxPkts;
received = mRxPkts - preRxPkts;
if (sent > 0) {
dataActivity |= WifiManager.DATA_ACTIVITY_OUT;
}
if (received > 0) {
dataActivity |= WifiManager.DATA_ACTIVITY_IN;
}
if (dataActivity != mDataActivity && mScreenOn.get()) {
mDataActivity = dataActivity;
for (Messenger client : mClients) {
Message msg = Message.obtain();
msg.what = WifiManager.DATA_ACTIVITY_NOTIFICATION;
msg.arg1 = mDataActivity;
try {
client.send(msg);
} catch (RemoteException e) {
// Failed to reach, skip
// Client removal is handled in WifiService
}
}
}
}
}
void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
pw.println("mEnableTrafficStatsPoll " + mEnableTrafficStatsPoll);
pw.println("mTrafficStatsPollToken " + mTrafficStatsPollToken);
pw.println("mTxPkts " + mTxPkts);
pw.println("mRxPkts " + mRxPkts);
pw.println("mDataActivity " + mDataActivity);
}
}
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