/**
* 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.jms;
import java.util.Collections;
import java.util.List;
import org.apache.camel.Exchange;
import org.apache.camel.spi.BrowsableEndpoint;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.jms.core.JmsOperations;
/**
* An endpoint for a JMS Queue which is also browsable
*
* @version $Revision: 665824 $
*/
public class JmsQueueEndpoint extends JmsEndpoint implements BrowsableEndpoint<JmsExchange> {
private static final transient Log LOG = LogFactory.getLog(JmsQueueEndpoint.class);
private int maximumBrowseSize = -1;
private final QueueBrowseStrategy queueBrowseStrategy;
public JmsQueueEndpoint(String uri, JmsComponent component, String destination,
JmsConfiguration configuration) {
this(uri, component, destination, configuration, null);
}
public JmsQueueEndpoint(String uri, JmsComponent component, String destination,
JmsConfiguration configuration, QueueBrowseStrategy queueBrowseStrategy) {
super(uri, component, destination, false, configuration);
if (queueBrowseStrategy == null) {
this.queueBrowseStrategy = createQueueBrowseStrategy();
} else {
this.queueBrowseStrategy = queueBrowseStrategy;
}
}
public JmsQueueEndpoint(String endpointUri, String destination, QueueBrowseStrategy queueBrowseStrategy) {
super(endpointUri, destination, false);
if (queueBrowseStrategy == null) {
this.queueBrowseStrategy = createQueueBrowseStrategy();
} else {
this.queueBrowseStrategy = queueBrowseStrategy;
}
}
public JmsQueueEndpoint(String endpointUri, String destination) {
super(endpointUri, destination, false);
queueBrowseStrategy = createQueueBrowseStrategy();
}
public int getMaximumBrowseSize() {
return maximumBrowseSize;
}
/**
* If a number is set > 0 then this limits the number of messages that are
* returned when browsing the queue
*/
public void setMaximumBrowseSize(int maximumBrowseSize) {
this.maximumBrowseSize = maximumBrowseSize;
}
public List<Exchange> getExchanges() {
if (queueBrowseStrategy == null) {
return Collections.EMPTY_LIST;
}
String queue = getDestination();
JmsOperations template = getConfiguration().createInOnlyTemplate(this, false, queue);
return queueBrowseStrategy.browse(template, queue, this);
}
protected static QueueBrowseStrategy createQueueBrowseStrategy() {
QueueBrowseStrategy answer = null;
try {
answer = JmsComponent.tryCreateDefaultQueueBrowseStrategy();
} catch (Throwable e) {
LOG.debug("Caught exception trying to create default QueueBrowseStrategy. "
+ "This could be due to spring 2.0.x on classpath? Cause: " + e, e);
}
if (answer == null) {
LOG.warn("Cannot browse queues as no QueueBrowseStrategy specified. Are you using Spring 2.0.x by any chance? If you upgrade to 2.5.x or later then queue browsing is supported");
}
return answer;
}
}