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 34 public SingleMessageHandler(Looper looper, int handledMessage) { 35 mHandledMessageWhat = handledMessage; 36 mHandler = new Handler(looper, this); 37 } 38 39 protected abstract void handleEvent(EventType event); 40 41 @Override 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 56 public void sendEvents(List<EventType> events) { 57 mHandler.sendMessage(mHandler.obtainMessage(mHandledMessageWhat, events)); 58 } 59 } 60
