com.blade.task.cron.CronThreadPoolExecutor Maven / Gradle / Ivy
/**
* Copyright (c) 2017, biezhi 王爵 ([email protected])
*
* 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.blade.task.cron;
import com.blade.task.Task;
import java.util.Date;
import java.util.concurrent.*;
/**
* CronThreadPoolExecutor
*
* the thread pool implementation of the cron expression.
*
* @author biezhi
* @date 2018/4/9
*/
public class CronThreadPoolExecutor extends ScheduledThreadPoolExecutor implements CronExecutorService {
public CronThreadPoolExecutor(int corePoolSize, ThreadFactory threadFactory) {
super(corePoolSize, threadFactory);
}
@Override
public ScheduledFuture submit(Task task) {
if (task == null) throw new NullPointerException();
CronExpression expression = task.getCronExpression();
Runnable scheduleTask = () -> {
Date now = new Date();
Date time = expression.getNextValidTimeAfter(now);
try {
while (time != null) {
if (!task.isRunning()) {
break;
}
CronThreadPoolExecutor.this.schedule(task.getTask(), time.getTime() - now.getTime(), TimeUnit.MILLISECONDS);
while (now.before(time)) {
Thread.sleep(time.getTime() - now.getTime());
now = new Date();
}
time = expression.getNextValidTimeAfter(now);
}
} catch (RejectedExecutionException | CancellationException e) {
// Occurs if executor was already shutdown when schedule() is called
} catch (InterruptedException e) {
// Occurs when executing tasks are interrupted during shutdownNow()
Thread.currentThread().interrupt();
}
};
return this.schedule(scheduleTask, task.getDelay(), TimeUnit.MILLISECONDS);
}
}