1/*
2 * Copyright (C) 2014 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
17package com.android.launcher3;
18
19import android.os.Handler;
20import android.os.Looper;
21
22import java.util.List;
23import java.util.concurrent.AbstractExecutorService;
24import java.util.concurrent.TimeUnit;
25
26/**
27 * An executor service that executes its tasks on the main thread.
28 *
29 * Shutting down this executor is not supported.
30 */
31public class MainThreadExecutor extends AbstractExecutorService {
32
33    private Handler mHandler = new Handler(Looper.getMainLooper());
34
35    @Override
36    public void execute(Runnable runnable) {
37        if (Looper.getMainLooper() == Looper.myLooper()) {
38            runnable.run();
39        } else {
40            mHandler.post(runnable);
41        }
42    }
43
44    /**
45     * Not supported and throws an exception when used.
46     */
47    @Override
48    @Deprecated
49    public void shutdown() {
50        throw new UnsupportedOperationException();
51    }
52
53    /**
54     * Not supported and throws an exception when used.
55     */
56    @Override
57    @Deprecated
58    public List<Runnable> shutdownNow() {
59        throw new UnsupportedOperationException();
60    }
61
62    @Override
63    public boolean isShutdown() {
64        return false;
65    }
66
67    @Override
68    public boolean isTerminated() {
69        return false;
70    }
71
72    /**
73     * Not supported and throws an exception when used.
74     */
75    @Override
76    @Deprecated
77    public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
78        throw new UnsupportedOperationException();
79    }
80}
81