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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 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.
* ============LICENSE_END=========================================================
*/
package org.onap.aai.event;
import org.onap.aai.event.api.EventConsumer;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.Processor;
import org.apache.camel.impl.ScheduledPollConsumer;
import org.onap.aai.logging.RouterCoreMsgs;
import org.onap.aai.cl.api.Logger;
import org.onap.aai.cl.eelf.LoggerFactory;
import org.onap.aai.cl.mdc.MdcContext;
import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.ScheduledThreadPoolExecutor;
/**
* The consumer component which is used to pull messages off of the event bus and send them to the
* next processor in the route chain. This type of consumer is based off of a scheduled poller so
* that events are pulled on a regular basis.
*/
public class EventBusConsumer extends ScheduledPollConsumer {
private Logger logger = LoggerFactory.getInstance().getLogger(EventBusConsumer.class);
private Logger auditLogger = LoggerFactory.getInstance().getAuditLogger(EventBusConsumer.class);
private final AbstractEventBusEndpoint endpoint;
private EventConsumer consumer;
/**
* EventBusConsumer Constructor.
*/
public EventBusConsumer(AbstractEventBusEndpoint endpoint, Processor processor, EventConsumer consumer) {
super(endpoint, processor);
super.setDelay(endpoint.getPollingDelay());
this.endpoint = endpoint;
setScheduledExecutorService(new ScheduledThreadPoolExecutor(endpoint.getPoolSize()));
this.consumer = consumer;
}
/**
* Method which is called by the Camel process on a scheduled basis. This specific implementation
* reads messages off of the configured topic and schedules tasks to process them .
*
* @return the number of messages that were processed off the event queue
*/
@Override
protected int poll() throws Exception {
String topic = endpoint.getEventTopic();
logger.debug("Checking for event on topic: " + topic);
int processCount = 0;
try {
Iterable<String> messages = consumer.consumeAndCommit();
for (String message : messages) {
Exchange exchange = endpoint.createExchange();
exchange.getIn().setBody(message);
getScheduledExecutorService().submit(new EventProcessor(exchange, topic));
++processCount;
}
} catch (Exception e) {
logger.error(RouterCoreMsgs.EVENT_PROCESSING_EXCEPTION, e, e.getLocalizedMessage());
}
logger.debug(RouterCoreMsgs.PROCESS_EVENT, topic, Integer.toString(processCount));
return processCount;
}
@Override
protected void doStop() throws Exception {
super.doStop();
if (endpoint != null) {
endpoint.close();
}
}
@Override
protected void doShutdown() throws Exception {
super.doShutdown();
if (endpoint != null) {
endpoint.close();
}
}
/**
* Class responsible for processing messages pulled off of the event bus.
*/
private class EventProcessor implements Runnable {
private Exchange message;
private String topic;
EventProcessor(Exchange message, String topic) {
this.message = message;
this.topic = topic;
}
@Override
public void run() {
try {
MdcContext.initialize(UUID.randomUUID().toString(), "DataRouter", "", "Event-Bus", "");
// Sends the message to the next processor in the defined Camel route
getProcessor().process(message);
Message response = message.getOut();
if (response != null) {
logger.debug("Routing response: " + response.getBody());
}
} catch (Exception e) {
logger.error(RouterCoreMsgs.EVENT_PROCESSING_EXCEPTION,e,e.getLocalizedMessage());
} finally {
// log exception if an exception occurred and was not handled
if (message.getException() != null) {
logger.info(RouterCoreMsgs.PROCESS_EVENT, topic, "FAILURE");
auditLogger.info(RouterCoreMsgs.PROCESS_EVENT, topic, "FAILURE");
} else {
logger.info(RouterCoreMsgs.PROCESS_EVENT, topic, "SUCCESS");
auditLogger.info(RouterCoreMsgs.PROCESS_EVENT, topic, "SUCCESS");
}
}
}
}
}
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