1 /*
2  * Copyright (C) 2017 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.internal;
18 
19 import android.os.Handler;
20 import android.os.Handler.Callback;
21 import android.os.Looper;
22 import android.os.Message;
23 import java.util.List;
24 import java.util.function.Consumer;
25 
26 /**
27  * Handles call back into clients for Car managers.
28  * @hide
29  */
30 public abstract class SingleMessageHandler<EventType> implements Callback {
31     private final int mHandledMessageWhat;
32     private final Handler mHandler;
33 
SingleMessageHandler(Looper looper, int handledMessage)34     public SingleMessageHandler(Looper looper, int handledMessage) {
35         mHandledMessageWhat = handledMessage;
36         mHandler = new Handler(looper, this);
37     }
38 
handleEvent(EventType event)39     protected abstract void handleEvent(EventType event);
40 
41     @Override
handleMessage(Message msg)42     public boolean handleMessage(Message msg) {
43         if (msg.what == mHandledMessageWhat) {
44             List<EventType> events = (List<EventType>) msg.obj;
45             events.forEach(new Consumer<EventType>() {
46                 @Override
47                 public void accept(EventType event) {
48                     handleEvent(event);
49                 }
50             });
51         }
52 
53         return true;
54     }
55 
sendEvents(List<EventType> events)56     public void sendEvents(List<EventType> events) {
57         mHandler.sendMessage(mHandler.obtainMessage(mHandledMessageWhat, events));
58     }
59 }
60