--- /dev/null
+/*
+ * Copyright (C) 2015 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.internal.util;
+
+import android.app.AlarmManager;
+import android.content.Context;
+import android.os.Handler;
+import android.os.Message;
+
+ /**
+ * An AlarmListener that sends the specified message to a Handler and keeps the system awake until
+ * the message is processed.
+ *
+ * This is useful when using the AlarmManager direct callback interface to wake up the system and
+ * request that an object whose API consists of messages (such as a StateMachine) perform some
+ * action.
+ *
+ * In this situation, using AlarmManager.onAlarmListener by itself will wake up the system to send
+ * the message, but does not guarantee that the system will be awake until the target object has
+ * processed it. This is because as soon as the onAlarmListener sends the message and returns, the
+ * AlarmManager releases its wakelock and the system is free to go to sleep again.
+ *
+ */
+public class WakeupMessage implements AlarmManager.OnAlarmListener {
+ private static AlarmManager sAlarmManager;
+ private final Handler mHandler;
+ private final String mCmdName;
+ private final int mCmd, mArg1, mArg2;
+
+ public WakeupMessage(Context context, Handler handler,
+ String cmdName, int cmd, int arg1, int arg2) {
+ if (sAlarmManager == null) {
+ sAlarmManager = context.getSystemService(AlarmManager.class);
+ }
+ mHandler = handler;
+ mCmdName = cmdName;
+ mCmd = cmd;
+ mArg1 = arg1;
+ mArg2 = arg2;
+ }
+
+ public WakeupMessage(Context context, Handler handler, String cmdName, int cmd, int arg1) {
+ this(context, handler, cmdName, cmd, arg1, 0);
+ }
+
+ public WakeupMessage(Context context, Handler handler, String cmdName, int cmd) {
+ this(context, handler, cmdName, cmd, 0, 0);
+ }
+
+ public void schedule(long when) {
+ sAlarmManager.setExact(
+ AlarmManager.ELAPSED_REALTIME_WAKEUP, when, mCmdName, this, mHandler);
+ }
+
+ public void cancel() {
+ sAlarmManager.cancel(this);
+ }
+
+ @Override
+ public void onAlarm() {
+ Message msg = mHandler.obtainMessage(mCmd, mArg1, mArg2);
+ mHandler.handleMessage(msg);
+ msg.recycle();
+ }
+}
import com.android.internal.util.Protocol;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
+import com.android.internal.util.WakeupMessage;
import com.android.server.connectivity.NetworkAgentInfo;
import java.io.IOException;
private class LingeringState extends State {
private static final String ACTION_LINGER_EXPIRED = "android.net.netmon.lingerExpired";
- private CustomIntentReceiver mBroadcastReceiver;
- private PendingIntent mIntent;
+ private WakeupMessage mWakeupMessage;
@Override
public void enter() {
- mLingerToken = new Random().nextInt();
- mBroadcastReceiver = new CustomIntentReceiver(ACTION_LINGER_EXPIRED, mLingerToken,
- CMD_LINGER_EXPIRED);
- mIntent = mBroadcastReceiver.getPendingIntent();
+ final String cmdName = ACTION_LINGER_EXPIRED + "." + mNetworkAgentInfo.network.netId;
+ mWakeupMessage = new WakeupMessage(mContext, getHandler(), cmdName, CMD_LINGER_EXPIRED);
long wakeupTime = SystemClock.elapsedRealtime() + mLingerDelayMs;
- mAlarmManager.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP, wakeupTime,
- // Give a specific window so we aren't subject to unknown inexactitude.
- mLingerDelayMs / 6, mIntent);
+ mWakeupMessage.schedule(wakeupTime);
}
@Override
}
return NOT_HANDLED;
case CMD_LINGER_EXPIRED:
- if (message.arg1 != mLingerToken)
- return HANDLED;
mConnectivityServiceHandler.sendMessage(
obtainMessage(EVENT_NETWORK_LINGER_COMPLETE, mNetworkAgentInfo));
return HANDLED;
@Override
public void exit() {
- mAlarmManager.cancel(mIntent);
- mContext.unregisterReceiver(mBroadcastReceiver);
+ mWakeupMessage.cancel();
}
}
import com.android.internal.util.Protocol;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
+import com.android.internal.util.WakeupMessage;
-import android.app.AlarmManager;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
// System services / libraries we use.
private final Context mContext;
- private final AlarmManager mAlarmManager;
private final Random mRandom;
private final INetworkManagementService mNMService;
// State variables.
private final StateMachine mController;
- private final AlarmListener mKickAlarm;
- private final AlarmListener mTimeoutAlarm;
- private final AlarmListener mRenewAlarm;
- private final AlarmListener mOneshotTimeoutAlarm;
+ private final WakeupMessage mKickAlarm;
+ private final WakeupMessage mTimeoutAlarm;
+ private final WakeupMessage mRenewAlarm;
+ private final WakeupMessage mOneshotTimeoutAlarm;
private final String mIfaceName;
private boolean mRegisteredForPreDhcpNotification;
private State mWaitBeforeStartState = new WaitBeforeStartState(mDhcpInitState);
private State mWaitBeforeRenewalState = new WaitBeforeRenewalState(mDhcpRenewingState);
+ private WakeupMessage makeWakeupMessage(String cmdName, int cmd) {
+ cmdName = DhcpClient.class.getSimpleName() + "." + mIfaceName + "." + cmdName;
+ return new WakeupMessage(mContext, getHandler(), cmdName, cmd);
+ }
+
private DhcpClient(Context context, StateMachine controller, String iface) {
super(TAG);
setInitialState(mStoppedState);
- mAlarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
IBinder b = ServiceManager.getService(Context.NETWORKMANAGEMENT_SERVICE);
mNMService = INetworkManagementService.Stub.asInterface(b);
mRandom = new Random();
// Used to schedule packet retransmissions.
- mKickAlarm = new AlarmListener("KICK", CMD_KICK);
+ mKickAlarm = makeWakeupMessage("KICK", CMD_KICK);
// Used to time out PacketRetransmittingStates.
- mTimeoutAlarm = new AlarmListener("TIMEOUT", CMD_TIMEOUT);
+ mTimeoutAlarm = makeWakeupMessage("TIMEOUT", CMD_TIMEOUT);
// Used to schedule DHCP renews.
- mRenewAlarm = new AlarmListener("RENEW", DhcpStateMachine.CMD_RENEW_DHCP);
+ mRenewAlarm = makeWakeupMessage("RENEW", DhcpStateMachine.CMD_RENEW_DHCP);
// Used to tell the caller when its request (CMD_START_DHCP or CMD_RENEW_DHCP) timed out.
// TODO: when the legacy DHCP client is gone, make the client fully asynchronous and
// remove this.
- mOneshotTimeoutAlarm = new AlarmListener("ONESHOT_TIMEOUT", CMD_ONESHOT_TIMEOUT);
+ mOneshotTimeoutAlarm = makeWakeupMessage("ONESHOT_TIMEOUT", CMD_ONESHOT_TIMEOUT);
}
@Override
return client;
}
- /**
- * An AlarmListener that sends the specified command to the state machine.
- */
- private class AlarmListener implements AlarmManager.OnAlarmListener {
- private final int cmd;
- private final String name;
-
- public AlarmListener(final String cmdName, final int cmd) {
- this.cmd = cmd;
- this.name = DhcpClient.class.getSimpleName() + "." + mIfaceName + "." + cmdName;
- }
-
- public void set(long alarmTime) {
- mAlarmManager.setExact(
- AlarmManager.ELAPSED_REALTIME_WAKEUP, alarmTime, name, this, getHandler());
- }
-
- public void cancel() {
- mAlarmManager.cancel(this);
- }
-
- public void onAlarm() {
- sendMessage(cmd);
- }
- }
-
private boolean initInterface() {
try {
mIface = NetworkInterface.getByName(mIfaceName);
}
private void scheduleRenew() {
- mAlarmManager.cancel(mRenewAlarm);
+ mRenewAlarm.cancel();
if (mDhcpLeaseExpiry != 0) {
long now = SystemClock.elapsedRealtime();
long alarmTime = (now + mDhcpLeaseExpiry) / 2;
- mRenewAlarm.set(alarmTime);
+ mRenewAlarm.schedule(alarmTime);
Log.d(TAG, "Scheduling renewal in " + ((alarmTime - now) / 1000) + "s");
} else {
Log.d(TAG, "Infinite lease, no renewal needed");
// one state, so we can just use the state timeout.
private void scheduleOneshotTimeout() {
final long alarmTime = SystemClock.elapsedRealtime() + DHCP_TIMEOUT_MS;
- mOneshotTimeoutAlarm.set(alarmTime);
+ mOneshotTimeoutAlarm.schedule(alarmTime);
}
class StoppedState extends LoggingState {
long now = SystemClock.elapsedRealtime();
long timeout = jitterTimer(mTimer);
long alarmTime = now + timeout;
- mKickAlarm.cancel();
- mKickAlarm.set(alarmTime);
+ mKickAlarm.schedule(alarmTime);
mTimer *= 2;
if (mTimer > MAX_TIMEOUT_MS) {
mTimer = MAX_TIMEOUT_MS;
protected void maybeInitTimeout() {
if (mTimeout > 0) {
long alarmTime = SystemClock.elapsedRealtime() + mTimeout;
- mTimeoutAlarm.set(alarmTime);
+ mTimeoutAlarm.schedule(alarmTime);
}
}
}
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