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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package com.android.tv.util;
import android.os.Handler;
import android.os.Looper;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.TimeUnit;
/**
* An executor service that executes its tasks on the main thread.
*
* <p>Shutting down this executor is not supported.
*/
public class MainThreadExecutor extends AbstractExecutorService {
private static final MainThreadExecutor INSTANCE = new MainThreadExecutor();
public static MainThreadExecutor getInstance() {
return INSTANCE;
}
private final Handler mHandler = new Handler(Looper.getMainLooper());
@Override
public void execute(Runnable runnable) {
if (Looper.getMainLooper() == Looper.myLooper()) {
runnable.run();
} else {
mHandler.post(runnable);
}
}
/** Not supported and throws an exception when used. */
@Override
@Deprecated
public void shutdown() {
throw new UnsupportedOperationException();
}
/** Not supported and throws an exception when used. */
@Override
@Deprecated
public List<Runnable> shutdownNow() {
throw new UnsupportedOperationException();
}
@Override
public boolean isShutdown() {
return false;
}
@Override
public boolean isTerminated() {
return false;
}
/** Not supported and throws an exception when used. */
@Override
@Deprecated
public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
throw new UnsupportedOperationException();
}
}
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