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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2018 European Software Marketing Ltd.
* ================================================================================
* 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.client;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import javax.naming.ConfigurationException;
import org.onap.aai.cl.api.Logger;
import org.onap.aai.cl.eelf.LoggerFactory;
import org.onap.aai.event.api.EventConsumer;
import org.onap.aai.event.api.MessageWithOffset;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;
import com.rabbitmq.client.AMQP;
/**
* Event bus client consumer wrapper for RabbitMQ.
* This will open a async consumer which will put messages on internal queue so that calling client can then
* consume and ackowledge the same based on offset/deliveryTag.
* Topic exchange type is powerful and can behave like other exchanges.
* When a queue is bound with "#" (hash) binding key - it will receive all the messages, regardless of the routing key - like in fanout exchange.
* When special characters "*" (star) and "#" (hash) aren't used in bindings, the topic exchange will behave just like a direct one
* @author GURJEETB
*
*/
public class RabbitMqEventConsumer implements EventConsumer {
private static Logger log = LoggerFactory.getInstance().getLogger(RabbitMqEventConsumer.class);
private BlockingQueue<MessageWithOffset> messageQueue;
private final Connection connection;
private final Channel channel;
private Long lastDeliveryTag;
private long timeout = 5000;
private RabbitMqClientConfig config;
/**
* (intended for testing prupose only)
* @param messageQueue
*/
public void setMessageQueue(BlockingQueue<MessageWithOffset> messageQueue) {
this.messageQueue = messageQueue;
}
public RabbitMqEventConsumer(RabbitMqClientConfig config) throws Exception {
this.config = config;
this.messageQueue = new ArrayBlockingQueue<>(1000);
if (config.getQueue() == null) {
throw new ConfigurationException("Mandatory config param queue not set");
}
this.connection = RabbitMqUtils.createConnection(config);
this.channel = connection.createChannel();
if (config.getExchangeName() != null) {
channel.exchangeDeclare(config.getExchangeName(), config.getExchangeType(), true, false, config.getExchangeArguments());
channel.queueDeclare(config.getQueue(), true, false, false, config.getQueueArguments());
channel.queueBind(config.getQueue(), config.getExchangeName(), config.getBindingKey());
}
else {
channel.queueDeclare(config.getQueue(), true, false, false, config.getQueueArguments());
}
channel.basicConsume(config.getQueue(), false, new CallBackConsumer(channel)); //AutoAck is false
}
@Override
public Iterable<String> consumeAndCommit() throws Exception {
Iterable<String> list = consume();
commitOffsets();
return list;
}
@Override
public Iterable<String> consume() throws Exception {
List<String> list = new ArrayList<>();
MessageWithOffset record = null;
if(messageQueue.peek()!=null) {
do
{
record = messageQueue.poll(1000, TimeUnit.MILLISECONDS);
lastDeliveryTag = record.getOffset();
list.add(record.getMessage());
}while(messageQueue.peek()!=null);
}
return list;
}
@Override
public Iterable<MessageWithOffset> consumeWithOffsets() throws Exception {
List<MessageWithOffset> list = new ArrayList<>();
MessageWithOffset record = null;
if(messageQueue.peek()!=null) {
do
{
record = messageQueue.poll(1000, TimeUnit.MILLISECONDS);
lastDeliveryTag = record.getOffset();
list.add(record);
}while(messageQueue.peek()!=null);
}
return list;
}
@Override
public void commitOffsets() throws Exception {
if(lastDeliveryTag != null)
{
channel.basicAck(lastDeliveryTag, true); //Ack messages upto lastDeliveryTag or offset so that they can be marked
lastDeliveryTag = null;
}
}
@Override
public void commitOffsets(long offset) throws Exception {
channel.basicAck(offset, true); //Ack messages upto lastDeliveryTag or offset so that they can be marked
}
/**
* Closes the channel
* @throws Exception
*/
public void close() throws Exception {
channel.close();
connection.close();
}
class CallBackConsumer extends DefaultConsumer{
CallBackConsumer(Channel channel) {
super(channel);
}
@Override
public void handleDelivery(String consumerTag, Envelope envelope,
AMQP.BasicProperties properties, byte[] body) throws IOException {
String message = new String(body, "UTF-8");
try
{
MessageWithOffset record = new MessageWithOffset(envelope.getDeliveryTag(), message);
messageQueue.offer(record, timeout, TimeUnit.MILLISECONDS);
}
catch(Exception e)
{
log.debug(" Got exception while handling message="+e.getMessage()+" Will be reposting to queue");
channel.basicNack(envelope.getDeliveryTag(), false, true); //Explicit Ack with requeue
}
}
}
}
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