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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 java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;

import org.openecomp.sdc.be.config.BeEcompErrorManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by michael on 6/24/2016.
 */
public class Worker<T extends Job<E>, E> implements Runnable {

	private String workerName;
	private LinkedBlockingQueue<T> inputQueue;

	private LinkedBlockingQueue<E> outputQueue;

	private static Logger log = LoggerFactory.getLogger(Worker.class.getName());

	public Worker(String workerName, LinkedBlockingQueue<T> inputQueue, LinkedBlockingQueue<E> outputQueue) {
		this.workerName = workerName;
		this.inputQueue = inputQueue;
		this.outputQueue = outputQueue;
	}

	@Override
	public void run() {

		try {
			while (true) {
				log.trace("worker:{} doing work", workerName);
				T job = inputQueue.poll(500, TimeUnit.MILLISECONDS);
				if (job == null) {

					log.debug("worker:{} nothing to do");
					break;
				}
				this.outputQueue.put(job.doWork());
				log.trace("worker:{} done with work", workerName);
			}
		} catch (Exception e) {
			BeEcompErrorManager.getInstance().logInternalFlowError("executingJobFailed",
					"failed during job execution worker" + workerName, BeEcompErrorManager.ErrorSeverity.ERROR);
			log.debug("worker: {} nothing to do stoping", workerName,e);
		}
	}

}