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/*
* Copyright (C) 2019 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.systemui.util.concurrency;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.TimeUnit;
/**
* Implementations of {@link DelayableExecutor} for SystemUI.
*/
public class ExecutorImpl implements DelayableExecutor {
private final Handler mHandler;
ExecutorImpl(Looper looper) {
mHandler = new Handler(looper, this::onHandleMessage);
}
@Override
public void execute(Runnable command) {
if (!mHandler.post(command)) {
throw new RejectedExecutionException(mHandler + " is shutting down");
}
}
@Override
public Runnable executeDelayed(Runnable r, long delay, TimeUnit unit) {
ExecutionToken token = new ExecutionToken(r);
Message m = mHandler.obtainMessage(MSG_EXECUTE_RUNNABLE, token);
mHandler.sendMessageDelayed(m, unit.toMillis(delay));
return token;
}
@Override
public Runnable executeAtTime(Runnable r, long uptimeMillis, TimeUnit unit) {
ExecutionToken token = new ExecutionToken(r);
Message m = mHandler.obtainMessage(MSG_EXECUTE_RUNNABLE, token);
mHandler.sendMessageAtTime(m, unit.toMillis(uptimeMillis));
return token;
}
private boolean onHandleMessage(Message msg) {
if (msg.what == MSG_EXECUTE_RUNNABLE) {
ExecutionToken token = (ExecutionToken) msg.obj;
token.runnable.run();
} else {
throw new IllegalStateException("Unrecognized message: " + msg.what);
}
return true;
}
private class ExecutionToken implements Runnable {
public final Runnable runnable;
private ExecutionToken(Runnable runnable) {
this.runnable = runnable;
}
@Override
public void run() {
mHandler.removeCallbacksAndMessages(this);
}
}
private static final int MSG_EXECUTE_RUNNABLE = 0;
}
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