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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.workers;
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.openecomp.sdc.common.log.wrappers.Logger;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
/**
* Created by michael on 6/24/2016.
*/
public class Manager<T extends Job, E> {
private static final int TERMINATION_TIMEAUT = 30;
private static Logger log = Logger.getLogger(Manager.class.getName());
private ExecutorService executor;
private LinkedBlockingQueue<T> inputQueue;
private LinkedBlockingQueue<E> outputQueue;
private int numberOfWorkers;
public void init(int numberOfWorkers) {
log.debug("initializing workers, creating {} workers", numberOfWorkers);
this.numberOfWorkers = numberOfWorkers;
final ThreadFactory threadFactory = new ThreadFactoryBuilder().setNameFormat("Worker-%d").build();
this.executor = Executors.newFixedThreadPool(numberOfWorkers, threadFactory);
this.inputQueue = new LinkedBlockingQueue<>();
this.outputQueue = new LinkedBlockingQueue<>();
}
public void addJob(T job) {
log.trace("job add to input queue");
this.inputQueue.add(job);
}
public LinkedBlockingQueue<E> start() {
for (int i = 0; i < numberOfWorkers; i++) {
String workerName = "worker-" + i;
log.debug("starting worker:{}", workerName);
this.executor.submit(new Worker(workerName, this.inputQueue, this.outputQueue));
}
executor.shutdown();
try {
if (!executor.awaitTermination(TERMINATION_TIMEAUT, TimeUnit.MINUTES)) {
log.error("timer elapsed while waiting for the worker's to finish. ");
}
log.debug("all workers finished");
} catch (InterruptedException e) {
log.error("failed while waiting for", e);
Thread.currentThread().interrupt();
}
return outputQueue;
}
//
// public static void main(String[] args) {
// ExecutorService executor = Executors.newFixedThreadPool(NTHREDS);
// for (int i = 0; i < 500; i++) {
// Runnable worker = new MyRunnable(10000000L + i);
// executor.execute(worker);
// }
// // This will make the executor accept no new threads
// // and finish all existing threads in the queue
// executor.shutdown();
// // Wait until all threads are finish
// executor.awaitTermination();
// System.out.println("Finished all threads");
// }
// }
}
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