1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.car; 18 19 import android.annotation.Nullable; 20 import android.os.IBinder; 21 import android.os.IInterface; 22 import android.os.RemoteException; 23 24 import java.util.Collection; 25 import java.util.HashMap; 26 27 /** 28 * Helper class to hold client's binder interface. 29 */ 30 public class BinderInterfaceContainer<T extends IInterface> { 31 32 public static class BinderInterface<T extends IInterface> 33 implements IBinder.DeathRecipient { 34 public final T binderInterface; 35 private final BinderInterfaceContainer<T> mContainer; 36 BinderInterface(BinderInterfaceContainer<T> container, T binderInterface)37 public BinderInterface(BinderInterfaceContainer<T> container, T binderInterface) { 38 mContainer = container; 39 this.binderInterface = binderInterface; 40 } 41 42 @Override binderDied()43 public void binderDied() { 44 binderInterface.asBinder().unlinkToDeath(this, 0); 45 mContainer.handleBinderDeath(this); 46 } 47 } 48 49 public interface BinderEventHandler<T extends IInterface> { onBinderDeath(BinderInterface<T> bInterface)50 void onBinderDeath(BinderInterface<T> bInterface); 51 } 52 53 private final BinderEventHandler<T> mEventHandler; 54 private final HashMap<IBinder, BinderInterface<T>> mBinders = new HashMap<>(); 55 BinderInterfaceContainer(@ullable BinderEventHandler<T> eventHandler)56 public BinderInterfaceContainer(@Nullable BinderEventHandler<T> eventHandler) { 57 mEventHandler = eventHandler; 58 } 59 BinderInterfaceContainer()60 public BinderInterfaceContainer() { 61 mEventHandler = null; 62 } 63 addBinder(T binderInterface)64 public void addBinder(T binderInterface) { 65 IBinder binder = binderInterface.asBinder(); 66 synchronized (this) { 67 BinderInterface<T> bInterface = mBinders.get(binder); 68 if (bInterface != null) { 69 return; 70 } 71 bInterface = new BinderInterface<T>(this, binderInterface); 72 try { 73 binder.linkToDeath(bInterface, 0); 74 } catch (RemoteException e) { 75 throw new IllegalArgumentException(e); 76 } 77 mBinders.put(binder, bInterface); 78 } 79 } 80 removeBinder(T binderInterface)81 public void removeBinder(T binderInterface) { 82 IBinder binder = binderInterface.asBinder(); 83 synchronized(this) { 84 BinderInterface<T> bInterface = mBinders.get(binder); 85 if (bInterface == null) { 86 return; 87 } 88 binder.unlinkToDeath(bInterface, 0); 89 mBinders.remove(binder); 90 } 91 } 92 getBinderInterface(T binderInterface)93 public BinderInterface<T> getBinderInterface(T binderInterface) { 94 IBinder binder = binderInterface.asBinder(); 95 synchronized (this) { 96 return mBinders.get(binder); 97 } 98 } 99 addBinderInterface(BinderInterface<T> bInterface)100 public void addBinderInterface(BinderInterface<T> bInterface) { 101 IBinder binder = bInterface.binderInterface.asBinder(); 102 synchronized (this) { 103 try { 104 binder.linkToDeath(bInterface, 0); 105 } catch (RemoteException e) { 106 throw new IllegalArgumentException(e); 107 } 108 mBinders.put(binder, bInterface); 109 } 110 } 111 getInterfaces()112 public Collection<BinderInterface<T>> getInterfaces() { 113 synchronized (this) { 114 return mBinders.values(); 115 } 116 } 117 size()118 public synchronized int size() { 119 return mBinders.size(); 120 } 121 clear()122 public synchronized void clear() { 123 Collection<BinderInterface<T>> interfaces = getInterfaces(); 124 for (BinderInterface<T> bInterface : interfaces) { 125 removeBinder(bInterface.binderInterface); 126 } 127 } 128 handleBinderDeath(BinderInterface<T> bInterface)129 private void handleBinderDeath(BinderInterface<T> bInterface) { 130 removeBinder(bInterface.binderInterface); 131 if (mEventHandler != null) { 132 mEventHandler.onBinderDeath(bInterface); 133 } 134 } 135 } 136