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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 java.util.concurrent.TimeUnit;
/**
* Implementation of {@link RepeatableExecutor} for SystemUI.
*/
class RepeatableExecutorImpl implements RepeatableExecutor {
private final DelayableExecutor mExecutor;
RepeatableExecutorImpl(DelayableExecutor executor) {
mExecutor = executor;
}
@Override
public void execute(Runnable command) {
mExecutor.execute(command);
}
@Override
public Runnable executeRepeatedly(Runnable r, long initDelay, long delay, TimeUnit unit) {
ExecutionToken token = new ExecutionToken(r, delay, unit);
token.start(initDelay, unit);
return token::cancel;
}
private class ExecutionToken implements Runnable {
private final Runnable mCommand;
private final long mDelay;
private final TimeUnit mUnit;
private final Object mLock = new Object();
private Runnable mCancel;
ExecutionToken(Runnable r, long delay, TimeUnit unit) {
mCommand = r;
mDelay = delay;
mUnit = unit;
}
@Override
public void run() {
mCommand.run();
synchronized (mLock) {
if (mCancel != null) {
mCancel = mExecutor.executeDelayed(this, mDelay, mUnit);
}
}
}
/** Starts execution that will repeat the command until {@link cancel}. */
public void start(long startDelay, TimeUnit unit) {
synchronized (mLock) {
mCancel = mExecutor.executeDelayed(this, startDelay, unit);
}
}
/** Cancel repeated execution of command. */
public void cancel() {
synchronized (mLock) {
if (mCancel != null) {
mCancel.run();
mCancel = null;
}
}
}
}
}
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