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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.be.model.cache.workers;
import org.openecomp.sdc.be.model.cache.jobs.Job;
import org.openecomp.sdc.be.model.cache.workers.IWorker;
import org.openecomp.sdc.be.workers.Worker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
/**
* Created by mlando on 9/6/2016. the class represents a worker the pull job
* from a queue and evacuates them.
*
*/
public class CacheWorker implements Runnable, IWorker {
private String workerName;
private static Logger log = LoggerFactory.getLogger(Worker.class.getName());
private LinkedBlockingQueue<Job> jobQueue;
private volatile boolean shutdown = false;
/**
* constructor
*
* @param workerName
* the name of the given worker
* @param jobQueue
* the queue the worker will block on.
*/
public CacheWorker(String workerName, LinkedBlockingQueue<Job> jobQueue) {
this.workerName = workerName;
this.jobQueue = jobQueue;
}
/**
* the method will try to get a job if one is avilable it will be retrived
* and handled. if no jobs are available the worker will block for 500
* milliseconds and then it wil check if it needs to shutdown. if not it
* will block again and so on until sutdown or a new job is available
*/
@Override
public void run() {
while (true) {
log.trace("CacheWorker:{} doing work", workerName);
try {
Job job = jobQueue.poll(500, TimeUnit.MILLISECONDS);
if (job != null) {
job.doWork();
log.trace("worker:{} done with work", workerName);
}
} catch (Throwable e) {
log.debug("worker {} failed during job execution.", workerName);
log.debug("exception", e);
}
if (shutdown) {
log.debug("worker:{} nothing to do stoping", workerName);
break;
}
}
}
/**
* the method sets the shutdown flag, when set the worker will stop it's
* execution as soon as possible with out completing its work
*/
@Override
public void shutDown() {
this.shutdown = true;
}
}
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