org.apache.activemq.artemis.jms.client.ActiveMQQueueBrowser Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 34.0.0.Final

Show newest version

/*
 * 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.activemq.artemis.jms.client;

import jakarta.jms.JMSException;
import jakarta.jms.Queue;
import jakarta.jms.QueueBrowser;
import java.util.Enumeration;
import java.util.NoSuchElementException;

import org.apache.activemq.artemis.api.core.ActiveMQException;
import org.apache.activemq.artemis.api.core.SimpleString;
import org.apache.activemq.artemis.api.core.client.ClientConsumer;
import org.apache.activemq.artemis.api.core.client.ClientMessage;
import org.apache.activemq.artemis.api.core.client.ClientSession;
import org.apache.activemq.artemis.jms.client.compatible1X.ActiveMQCompatibleMessage;
import org.apache.activemq.artemis.utils.SelectorTranslator;

/**
 * ActiveMQ Artemis implementation of a JMS QueueBrowser.
 */
public final class ActiveMQQueueBrowser implements QueueBrowser {


   private final ConnectionFactoryOptions options;

   private final ClientSession session;

   private ClientConsumer consumer;

   private final ActiveMQQueue queue;

   private SimpleString filterString;

   private final boolean enable1xPrefixes;



   protected ActiveMQQueueBrowser(final ConnectionFactoryOptions options,
                                  final ActiveMQQueue queue,
                                  final String messageSelector,
                                  final ClientSession session,
                                  final boolean enable1xPrefixes) throws JMSException {
      this.options = options;
      this.session = session;
      this.queue = queue;
      if (messageSelector != null) {
         filterString = SimpleString.of(SelectorTranslator.convertToActiveMQFilterString(messageSelector));
      }
      this.enable1xPrefixes = enable1xPrefixes;
   }

   // QueueBrowser implementation -------------------------------------------------------------------

   @Override
   public void close() throws JMSException {
      if (consumer != null) {
         try {
            consumer.close();
         } catch (ActiveMQException e) {
            throw JMSExceptionHelper.convertFromActiveMQException(e);
         }
      }
   }

   @Override
   public Enumeration getEnumeration() throws JMSException {
      try {
         close();

         consumer = session.createConsumer(queue.getSimpleAddress(), filterString, true);

         return new BrowserEnumeration();
      } catch (ActiveMQException e) {
         throw JMSExceptionHelper.convertFromActiveMQException(e);
      }

   }

   @Override
   public String getMessageSelector() throws JMSException {
      return filterString == null ? null : filterString.toString();
   }

   @Override
   public Queue getQueue() throws JMSException {
      return queue;
   }


   @Override
   public String toString() {
      return "ActiveMQQueueBrowser->" + consumer;
   }

   private final class BrowserEnumeration implements Enumeration {

      ClientMessage current = null;

      @Override
      public boolean hasMoreElements() {
         if (current == null) {
            try {
               current = consumer.receiveImmediate();
            } catch (ActiveMQException e) {
               return false;
            }
         }
         return current != null;
      }

      @Override
      public ActiveMQMessage nextElement() {
         ActiveMQMessage msg;
         if (hasMoreElements()) {
            ClientMessage next = current;
            current = null;
            if (enable1xPrefixes) {
               msg = ActiveMQCompatibleMessage.createMessage(next, session, options);
            } else {
               msg = ActiveMQMessage.createMessage(next, session, options);
            }

            try {
               msg.doBeforeReceive();
            } catch (Exception e) {
               ActiveMQJMSClientLogger.LOGGER.errorCreatingMessage(msg.getCoreMessage().toString(), e);

               return null;
            }
            return msg;
         } else {
            throw new NoSuchElementException();
         }
      }
   }
}