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/*
* Copyright (C) 2017 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.launcher3.util;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Process;
import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.TimeUnit;
/**
* Extension of {@link AbstractExecutorService} which executed on a provided looper.
*/
public class LooperExecutor extends AbstractExecutorService {
private final Handler mHandler;
public LooperExecutor(Looper looper) {
mHandler = new Handler(looper);
}
public Handler getHandler() {
return mHandler;
}
@Override
public void execute(Runnable runnable) {
if (mHandler.getLooper() == Looper.myLooper()) {
runnable.run();
} else {
mHandler.post(runnable);
}
}
/**
* Same as execute, but never runs the action inline.
*/
public void post(Runnable runnable) {
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) {
throw new UnsupportedOperationException();
}
/**
* Returns the thread for this executor
*/
public Thread getThread() {
return mHandler.getLooper().getThread();
}
/**
* Returns the looper for this executor
*/
public Looper getLooper() {
return mHandler.getLooper();
}
/**
* Set the priority of a thread, based on Linux priorities.
* @param priority Linux priority level, from -20 for highest scheduling priority
* to 19 for lowest scheduling priority.
* @see Process#setThreadPriority(int, int)
*/
public void setThreadPriority(int priority) {
Process.setThreadPriority(((HandlerThread) getThread()).getThreadId(), priority);
}
}
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