/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.yarn.sls.scheduler;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Queue;
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.exceptions.YarnException;
@Private
@Unstable
public class TaskRunner {
@Private
@Unstable
public abstract static class Task implements Runnable, Delayed {
private long start;
private long end;
private long nextRun;
private long startTime;
private long endTime;
private long repeatInterval;
private Queue<Task> queue;
public Task(){}
//values in milliseconds, start/end are milliseconds from now
public void init(long startTime, long endTime, long repeatInterval) {
if (endTime - startTime < 0) {
throw new IllegalArgumentException(MessageFormat.format(
"endTime[{0}] cannot be smaller than startTime[{1}]", endTime,
startTime));
}
if (repeatInterval < 0) {
throw new IllegalArgumentException(MessageFormat.format(
"repeatInterval[{0}] cannot be less than 1", repeatInterval));
}
if ((endTime - startTime) % repeatInterval != 0) {
throw new IllegalArgumentException(MessageFormat.format(
"Invalid parameters: (endTime[{0}] - startTime[{1}]) " +
"% repeatInterval[{2}] != 0",
endTime, startTime, repeatInterval));
}
start = startTime;
end = endTime;
this.repeatInterval = repeatInterval;
}
private void timeRebase(long now) {
startTime = now + start;
endTime = now + end;
this.nextRun = startTime;
}
//values in milliseconds, start is milliseconds from now
//it only executes firstStep()
public void init(long startTime) {
init(startTime, startTime, 1);
}
private void setQueue(Queue<Task> queue) {
this.queue = queue;
}
@Override
public final void run() {
try {
if (nextRun == startTime) {
firstStep();
nextRun += repeatInterval;
if (nextRun <= endTime) {
queue.add(this);
}
} else if (nextRun < endTime) {
middleStep();
nextRun += repeatInterval;
queue.add(this);
} else {
lastStep();
}
} catch (Exception e) {
e.printStackTrace();
Thread.getDefaultUncaughtExceptionHandler()
.uncaughtException(Thread.currentThread(), e);
}
}
@Override
public long getDelay(TimeUnit unit) {
return unit.convert(nextRun - System.currentTimeMillis(),
TimeUnit.MILLISECONDS);
}
@Override
public int compareTo(Delayed o) {
if (!(o instanceof Task)) {
throw new IllegalArgumentException("Parameter must be a Task instance");
}
Task other = (Task) o;
return (int) Math.signum(nextRun - other.nextRun);
}
public abstract void firstStep() throws Exception;
public abstract void middleStep() throws Exception;
public abstract void lastStep() throws Exception;
public void setEndTime(long et) {
endTime = et;
}
}
private DelayQueue queue;
private int threadPoolSize;
private ThreadPoolExecutor executor;
private long startTimeMS = 0;
public TaskRunner() {
queue = new DelayQueue();
}
public void setQueueSize(int threadPoolSize) {
this.threadPoolSize = threadPoolSize;
}
@SuppressWarnings("unchecked")
public void start() {
if (executor != null) {
throw new IllegalStateException("Already started");
}
DelayQueue preStartQueue = queue;
queue = new DelayQueue();
executor = new ThreadPoolExecutor(threadPoolSize, threadPoolSize, 0,
TimeUnit.MILLISECONDS, queue);
executor.prestartAllCoreThreads();
startTimeMS = System.currentTimeMillis();
for (Object d : preStartQueue) {
schedule((Task) d, startTimeMS);
}
}
public void stop() {
executor.shutdownNow();
}
@SuppressWarnings("unchecked")
private void schedule(Task task, long timeNow) {
task.timeRebase(timeNow);
task.setQueue(queue);
queue.add(task);
}
public void schedule(Task task) {
schedule(task, System.currentTimeMillis());
}
public long getStartTimeMS() {
return this.startTimeMS;
}
}