org.apache.camel.component.jms.DefaultQueueBrowseStrategy Maven / Gradle / Ivy
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* 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.ArrayList;
import java.util.Enumeration;
import java.util.List;
import jakarta.jms.JMSException;
import jakarta.jms.Message;
import jakarta.jms.QueueBrowser;
import jakarta.jms.Session;
import org.apache.camel.Exchange;
import org.springframework.jms.core.BrowserCallback;
import org.springframework.jms.core.JmsOperations;
/**
* A default implementation of queue browsing using the Spring {@link BrowserCallback}
*/
public class DefaultQueueBrowseStrategy implements QueueBrowseStrategy {
@Override
public List browse(JmsOperations template, String queue, final JmsBrowsableEndpoint endpoint) {
if (endpoint.getSelector() != null) {
return template.browseSelected(queue, endpoint.getSelector(),
(session, browser) -> doBrowse(endpoint, session, browser));
} else {
return template.browse(queue, (session, browser) -> doBrowse(endpoint, session, browser));
}
}
private static List doBrowse(JmsBrowsableEndpoint endpoint, Session session, QueueBrowser browser)
throws JMSException {
int size = endpoint.getMaximumBrowseSize();
if (size <= 0) {
size = Integer.MAX_VALUE;
}
// not the best implementation in the world as we have to browse
// the entire queue, which could be massive
List answer = new ArrayList<>();
Enumeration iter = browser.getEnumeration();
for (int i = 0; i < size && iter.hasMoreElements(); i++) {
Message message = (Message) iter.nextElement();
Exchange exchange = endpoint.createExchange(message, session);
answer.add(exchange);
}
return answer;
}
}