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/*-
* ============LICENSE_START=======================================================
* openECOMP : APP-C
* ================================================================================
* 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.appc.listener;
import java.security.SecureRandom;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.commons.lang3.concurrent.BasicThreadFactory;
import org.openecomp.appc.listener.impl.EventHandlerImpl;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
public abstract class AbstractListener implements Listener {
private final EELFLogger LOG = EELFManager.getInstance().getLogger(AbstractListener.class);
protected AtomicBoolean run = new AtomicBoolean(false);
protected int QUEUED_MIN = 1;
protected int QUEUED_MAX = 10;
protected int THREAD_MIN = 4;
protected int THREAD_MAX = THREAD_MIN; // Fixed thread pool
protected int THREAD_SCALE_DOWN_SEC = 10; // Number of seconds to wait until we remove idle threads
protected ThreadPoolExecutor executor;
protected EventHandler dmaap;
protected ListenerProperties props;
private String listenerId;
public AbstractListener(ListenerProperties props) {
updateProperties(props);
dmaap = new EventHandlerImpl(props);
if (dmaap.getClientId().equals("0")) {
dmaap.setClientId(String.valueOf(new SecureRandom().nextInt(1000)));
}
BlockingQueue<Runnable> threadQueue = new ArrayBlockingQueue<Runnable>(QUEUED_MAX + QUEUED_MIN + 1);
executor = new ThreadPoolExecutor(THREAD_MIN, THREAD_MAX, THREAD_SCALE_DOWN_SEC, TimeUnit.SECONDS, threadQueue,
new JobRejectionHandler());
// Custom Named thread factory
BasicThreadFactory threadFactory = new BasicThreadFactory.Builder().namingPattern("DMaaP-Worker-%d").build();
executor.setThreadFactory(threadFactory);
run.set(true);
}
/**
* Starts a loop that will only end after stop() or stopNow() are called. The loop will read messages off the DMaaP
* topic and perform some action on them while writing messages back to DMaaP at critical points in the execution.
* Inherited from Runnable.
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
LOG.error("Listener.run() has not been implemented");
}
@Override
public void stop() {
run.set(false);
LOG.info(String.format("Stopping with %d messages in queue", executor.getQueue().size()));
executor.shutdown();
try {
executor.awaitTermination(10, TimeUnit.SECONDS);
} catch (InterruptedException e) {
LOG.error("Listener graceful stop() failed", e);
}
// close DMaaP clients
if (dmaap != null) {
dmaap.closeClients();
}
LOG.info("Listener Thread Pool Finished");
}
@Override
public void stopNow() {
run.set(false);
LOG.info(String.format("StopNow called. Orphaning %d messages in the queue", executor.getQueue().size()));
executor.getQueue().clear();
stop();
}
@Override
public String getBenchmark() {
return String.format("%s - No benchmarking implemented.", getListenerId());
}
@Override
public String getListenerId() {
return listenerId;
}
// Sets the id of the listener in
@Override
public void setListenerId(String id) {
listenerId = id;
}
private void updateProperties(ListenerProperties properties) {
this.props = properties;
QUEUED_MIN =
Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MIN_QUEUE, String.valueOf(QUEUED_MIN)));
QUEUED_MAX =
Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MAX_QUEUE, String.valueOf(QUEUED_MAX)));
THREAD_MIN =
Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MIN_POOL, String.valueOf(THREAD_MIN)));
THREAD_MAX =
Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MAX_POOL, String.valueOf(THREAD_MAX)));
listenerId = props.getPrefix();
}
/**
* This class will be used to handle what happens when we cannot add a job because of a ThreadPool issue. It does
* not get invoked if there is any fault with the job. NOTE: So far, this has only been seen when doing a
* {@link Listener#stopNow}
*
*/
class JobRejectionHandler implements RejectedExecutionHandler {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
LOG.error(String.format("A job was rejected. [%s]", r));
}
}
}
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