/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.camel.component.ironmq;
import io.iron.ironmq.EmptyQueueException;
import io.iron.ironmq.Message;
import io.iron.ironmq.Messages;
import java.util.LinkedList;
import java.util.Queue;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.impl.ScheduledBatchPollingConsumer;
import org.apache.camel.spi.Synchronization;
import org.apache.camel.util.CastUtils;
import org.apache.camel.util.ExchangeHelper;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The IronMQ consumer.
*/
public class IronMQConsumer extends ScheduledBatchPollingConsumer {
private static final Logger LOG = LoggerFactory.getLogger(IronMQConsumer.class);
public IronMQConsumer(Endpoint endpoint, Processor processor) {
super(endpoint, processor);
}
@Override
protected int poll() throws Exception {
// must reset for each poll
shutdownRunningTask = null;
pendingExchanges = 0;
try {
Messages messages = null;
if (getEndpoint().getConfiguration().getTimeout() > 0) {
messages = getEndpoint().getQueue().get(getMaxMessagesPerPoll(), getEndpoint().getConfiguration().getTimeout());
LOG.trace("Receiving messages with request [messagePerPoll{}, timeout {}]...", getMaxMessagesPerPoll(), getEndpoint().getConfiguration().getTimeout());
} else {
messages = getEndpoint().getQueue().get(getMaxMessagesPerPoll());
LOG.trace("Receiving messages with request [messagePerPoll {}]...", getMaxMessagesPerPoll());
}
LOG.trace("Received {} messages", messages.getMessages().length);
Queue<Exchange> exchanges = createExchanges(messages.getMessages());
return processBatch(CastUtils.cast(exchanges));
} catch (EmptyQueueException e) {
return 0;
}
}
protected Queue<Exchange> createExchanges(Message[] messages) {
LOG.trace("Received {} messages in this poll", messages.length);
Queue<Exchange> answer = new LinkedList<Exchange>();
for (int i = 0; i < messages.length; i++) {
Exchange exchange = getEndpoint().createExchange(messages[i]);
answer.add(exchange);
}
return answer;
}
@Override
public int processBatch(Queue<Object> exchanges) throws Exception {
int total = exchanges.size();
for (int index = 0; index < total && isBatchAllowed(); index++) {
// only loop if we are started (allowed to run)
final Exchange exchange = ObjectHelper.cast(Exchange.class, exchanges.poll());
// add current index and total as properties
exchange.setProperty(Exchange.BATCH_INDEX, index);
exchange.setProperty(Exchange.BATCH_SIZE, total);
exchange.setProperty(Exchange.BATCH_COMPLETE, index == total - 1);
// update pending number of exchanges
pendingExchanges = total - index - 1;
// add on completion to handle after work when the exchange is done
exchange.addOnCompletion(new Synchronization() {
public void onComplete(Exchange exchange) {
processCommit(exchange);
}
public void onFailure(Exchange exchange) {
processRollback(exchange);
}
@Override
public String toString() {
return "IronMQConsumerOnCompletion";
}
});
LOG.trace("Processing exchange [{}]...", exchange);
getProcessor().process(exchange);
}
return total;
}
/**
* Strategy to delete the message after being processed.
*
* @param exchange the exchange
*/
protected void processCommit(Exchange exchange) {
String messageid = null;
try {
messageid = ExchangeHelper.getMandatoryHeader(exchange, IronMQConstants.MESSAGE_ID, String.class);
LOG.trace("Deleting message with id {}...", messageid);
getEndpoint().getQueue().deleteMessage(messageid);
LOG.trace("Message deleted");
} catch (Exception e) {
getExceptionHandler().handleException("Error occurred during delete of object with messageid : " + messageid + ". This exception is ignored.", exchange, e);
}
}
/**
* Strategy when processing the exchange failed.
*
* @param exchange the exchange
*/
protected void processRollback(Exchange exchange) {
Exception cause = exchange.getException();
if (cause != null) {
LOG.warn("Exchange failed, so rolling back message status: " + exchange, cause);
} else {
LOG.warn("Exchange failed, so rolling back message status: {}", exchange);
}
}
@Override
public IronMQEndpoint getEndpoint() {
return (IronMQEndpoint)super.getEndpoint();
}
}