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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.onap.appc.listener.impl;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang3.concurrent.BasicThreadFactory;
import org.onap.appc.listener.Controller;
import org.onap.appc.listener.Listener;
import org.onap.appc.listener.ListenerProperties;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
/**
* A common implementation of a controller. This controller should not need to be modified to implement new listeners
*
*/
public class ControllerImpl implements Controller {
private final EELFLogger LOG = EELFManager.getInstance().getLogger(ControllerImpl.class);
private int LISTENER_COUNT = 1;
private Map<ListenerProperties, Listener> listeners = null;
private ThreadPoolExecutor executor;
/**
* Creates a Controller with the set of listener properties which will be used to start listener threads.
*
* @param properties
* A non null Set of ListenerProperties
*/
public ControllerImpl(Set<ListenerProperties> properties) {
listeners = new HashMap<ListenerProperties, Listener>();
for (ListenerProperties props : properties) {
if (props.getClass() != null) {
listeners.put(props, null);
} else {
LOG.error(String.format(
"The ListenerProperties %s has no Listener class associated with it and will not run.", props));
properties.remove(props);
}
}
LISTENER_COUNT = properties.size();
// Only create executor if listeners are configured
if (LISTENER_COUNT > 0) {
executor = new ThreadPoolExecutor(LISTENER_COUNT, LISTENER_COUNT, 1, TimeUnit.SECONDS,
new ArrayBlockingQueue<Runnable>(LISTENER_COUNT));
// Custom Named thread factory
BasicThreadFactory threadFactory = new BasicThreadFactory.Builder().namingPattern("Appc-Listener-%d").build();
executor.setThreadFactory(threadFactory);
}
}
@Override
public void start() {
LOG.info("Starting DMaaP Controller.");
for (ListenerProperties props : listeners.keySet()) {
try {
if (props.isDisabled()) {
LOG.warn(String.format("The listener %s is disabled and will not be run", props.getPrefix()));
} else {
Listener l = props.getListenerClass().getConstructor(ListenerProperties.class).newInstance(props);
l.setListenerId(props.getPrefix());
listeners.put(props, l);
executor.execute(l);
}
} catch (Exception e) {
LOG.error(String.format("Exception while starting listener %s.", props), e);
}
}
}
@Override
public void stop(boolean stopNow) {
LOG.info("Stopping DMaaP Controller.");
Iterator<Listener> itr = listeners.values().iterator();
while (itr.hasNext()) {
Listener l = itr.next();
if (stopNow && l != null) {
l.stopNow();
} else if(l!=null){
l.stop();
}
itr.remove();
}
// disable new tasks from being submitted
if(executor != null) {
executor.shutdown();
int timeout=300;
try {
if (!executor.awaitTermination(timeout, TimeUnit.SECONDS)) {
LOG.error("Not all tasks completed execution after " + timeout + " seconds. " +
"Attempting to stop all actively executing tasks.");
executor.shutdownNow();
}
if (!executor.awaitTermination(timeout, TimeUnit.SECONDS)) {
LOG.error("Could not terminate all tasks after " + (timeout*2) + " seconds.");
}
} catch (InterruptedException e) {
executor.shutdownNow();
Thread.currentThread().interrupt();
}
}
}
@Override
public Map<ListenerProperties, Listener> getListeners() {
return listeners;
}
}
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