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/*
* Copyright (C) 2016 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.os.IBinder;
import android.os.IBinder.DeathRecipient;
import android.os.RemoteException;
import com.android.internal.util.StateMachine;
/**
* Allows StateMachine instances to subscribe to binder death.
*
* @hide
*/
public class StateMachineDeathRecipient implements DeathRecipient {
private final StateMachine mStateMachine;
private final int mDeathCommand;
private IBinder mLinkedBinder;
/**
* Construct a StateMachineDeathRecipient.
*
* @param sm StateMachine instance to receive a message upon Binder death.
* @param command message to send the state machine.
*/
public StateMachineDeathRecipient(StateMachine sm, int command) {
mStateMachine = sm;
mDeathCommand = command;
}
/**
* Listen for the death of a binder.
*
* This method will unlink from death notifications from any
* previously linked IBinder instance.
*
* @param binder remote object to listen for death.
* @return true iff we have successfully subscribed to death notifications of a live
* IBinder instance.
*/
public boolean linkToDeath(IBinder binder) {
unlinkToDeath();
try {
binder.linkToDeath(this, 0);
} catch (RemoteException e) {
// The remote has already died.
return false;
}
mLinkedBinder = binder;
return true;
}
/**
* Unlink from notifications from the last linked IBinder instance.
*/
public void unlinkToDeath() {
if (mLinkedBinder == null) {
return;
}
mLinkedBinder.unlinkToDeath(this, 0);
mLinkedBinder = null;
}
/**
* Called by the binder subsystem upon remote object death.
*/
@Override
public void binderDied() {
mStateMachine.sendMessage(mDeathCommand);
}
}
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