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 
24 import java.util.List;
25 import java.util.function.Consumer;
26 
27 /**
28  * Handles call back into clients for Car managers.
29  * @hide
30  */
31 public abstract class SingleMessageHandler<EventType> implements Callback {
32     private final int mHandledMessageWhat;
33     private final Handler mHandler;
34 
SingleMessageHandler(Looper looper, int handledMessage)35     public SingleMessageHandler(Looper looper, int handledMessage) {
36         mHandledMessageWhat = handledMessage;
37         mHandler = new Handler(looper, this);
38     }
39 
SingleMessageHandler(Handler handler, int handledMessage)40     public SingleMessageHandler(Handler handler, int handledMessage) {
41         this(handler.getLooper(), handledMessage);
42     }
43 
handleEvent(EventType event)44     protected abstract void handleEvent(EventType event);
45 
46     @Override
handleMessage(Message msg)47     public boolean handleMessage(Message msg) {
48         if (msg.what == mHandledMessageWhat) {
49             List<EventType> events = (List<EventType>) msg.obj;
50             events.forEach(new Consumer<EventType>() {
51                 @Override
52                 public void accept(EventType event) {
53                     handleEvent(event);
54                 }
55             });
56         }
57 
58         return true;
59     }
60 
sendEvents(List<EventType> events)61     public void sendEvents(List<EventType> events) {
62         mHandler.sendMessage(mHandler.obtainMessage(mHandledMessageWhat, events));
63     }
64 
65 }
66