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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.service.engine.event.impl.eventrequestor;
import java.util.EnumMap;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.onap.policy.apex.core.infrastructure.threading.ApplicationThreadFactory;
import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
import org.onap.policy.apex.service.engine.event.ApexEventConsumer;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.engine.event.ApexEventReceiver;
import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
import org.onap.policy.apex.service.engine.event.PeeredReference;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class implements an Apex event consumer that receives events from its peered event requestor
* producer.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class EventRequestorConsumer implements ApexEventConsumer, Runnable {
// Get a reference to the logger
private static final Logger LOGGER = LoggerFactory.getLogger(EventRequestorConsumer.class);
// The amount of time to wait in milliseconds between checks that the consumer thread has
// stopped
private static final long EVENT_REQUESTOR_WAIT_SLEEP_TIME = 50;
// The event receiver that will receive events from this consumer
private ApexEventReceiver eventReceiver;
// The name for this consumer
private String name = null;
// The peer references for this event handler
private final Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap =
new EnumMap<>(EventHandlerPeeredMode.class);
// Temporary request holder for incoming event send requests
private final BlockingQueue<Object> incomingEventRequestQueue = new LinkedBlockingQueue<>();
// The consumer thread and stopping flag
private Thread consumerThread;
private boolean stopOrderedFlag = false;
// The number of events received to date
private int eventsReceived = 0;
@Override
public void init(final String consumerName, final EventHandlerParameters consumerParameters,
final ApexEventReceiver incomingEventReceiver) throws ApexEventException {
this.eventReceiver = incomingEventReceiver;
this.name = consumerName;
// Check and get the event requestor consumer properties
if (!(consumerParameters
.getCarrierTechnologyParameters() instanceof EventRequestorCarrierTechnologyParameters)) {
final String errorMessage =
"specified consumer properties are not applicable to event Requestor consumer (" + this.name + ")";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
// Check if we are in peered mode
if (!consumerParameters.isPeeredMode(EventHandlerPeeredMode.REQUESTOR)) {
final String errorMessage = "event Requestor consumer (" + this.name
+ ") must run in peered requestor mode with a event Requestor producer";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
}
/**
* Receive an incoming event send request from the peered event Requestor producer and queue it.
*
* @param eventObject the incoming event to process
* @throws ApexEventRuntimeException on queueing errors
*/
public void processEvent(final Object eventObject) {
// Push the event onto the queue for handling
try {
incomingEventRequestQueue.add(eventObject);
} catch (final Exception e) {
final String errorMessage =
"could not queue request \"" + eventObject + "\" on event Requestor consumer (" + this.name + ")";
LOGGER.warn(errorMessage, e);
throw new ApexEventRuntimeException(errorMessage);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void start() {
// Configure and start the event reception thread
final String threadName = this.getClass().getName() + ":" + this.name;
consumerThread = new ApplicationThreadFactory(threadName).newThread(this);
consumerThread.setDaemon(true);
consumerThread.start();
}
/**
* {@inheritDoc}.
*/
@Override
public String getName() {
return name;
}
/**
* Get the number of events received to date.
*
* @return the number of events received
*/
public int getEventsReceived() {
return eventsReceived;
}
/**
* {@inheritDoc}.
*/
@Override
public PeeredReference getPeeredReference(final EventHandlerPeeredMode peeredMode) {
return peerReferenceMap.get(peeredMode);
}
/**
* {@inheritDoc}.
*/
@Override
public void setPeeredReference(final EventHandlerPeeredMode peeredMode, final PeeredReference peeredReference) {
peerReferenceMap.put(peeredMode, peeredReference);
}
/**
* {@inheritDoc}.
*/
@Override
public void run() {
// The endless loop that receives events using REST calls
while (consumerThread.isAlive() && !stopOrderedFlag) {
try {
// Take the next event from the queue
final Object eventObject =
incomingEventRequestQueue.poll(EVENT_REQUESTOR_WAIT_SLEEP_TIME, TimeUnit.MILLISECONDS);
if (eventObject == null) {
// Poll timed out, wait again
continue;
}
// Send the event into Apex
eventReceiver.receiveEvent(null, eventObject);
eventsReceived++;
} catch (final InterruptedException e) {
LOGGER.debug("Thread interrupted, Reason {}", e.getMessage());
Thread.currentThread().interrupt();
} catch (final Exception e) {
LOGGER.warn("error receiving events on thread {}", consumerThread.getName(), e);
}
}
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
stopOrderedFlag = true;
while (consumerThread.isAlive()) {
ThreadUtilities.sleep(EVENT_REQUESTOR_WAIT_SLEEP_TIME);
}
}
}
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