DurableTopicMessageContainer xref

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    1   /***
    2    *
    3    * Copyright 2004 Protique Ltd
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18  package org.codehaus.activemq.service.impl;
    19
    20  import org.apache.commons.logging.Log;
    21  import org.apache.commons.logging.LogFactory;
    22  import org.codehaus.activemq.message.ActiveMQMessage;
    23  import org.codehaus.activemq.message.ConsumerInfo;
    24  import org.codehaus.activemq.message.MessageAck;
    25  import org.codehaus.activemq.service.MessageIdentity;
    26  import org.codehaus.activemq.service.Subscription;
    27  import org.codehaus.activemq.service.TopicMessageContainer;
    28  import org.codehaus.activemq.store.TopicMessageStore;
    29
    30  import javax.jms.JMSException;
    31
    32  /***
    33   * A default implemenation of a Durable Topic based
    34   * {@link org.codehaus.activemq.service.MessageContainer}
    35   * which acts as an adapter between the {@link org.codehaus.activemq.service.MessageContainerManager}
    36   * requirements and those of the persistent {@link TopicMessageStore} implementations.
    37   *
    38   * @version $Revision: 1.14 $
    39   */
    40  public class DurableTopicMessageContainer implements TopicMessageContainer {
    41      private static final Log log = LogFactory.getLog(DurableTopicMessageContainer.class);
    42
    43      private TopicMessageStore messageStore;
    44      private String destinationName;
    45      private MessageIdentity lastMessageIdentity;
    46
    47      public DurableTopicMessageContainer(TopicMessageStore messageStore, String destinationName) {
    48          this.messageStore = messageStore;
    49          this.destinationName = destinationName;
    50      }
    51
    52      public String getDestinationName() {
    53          return destinationName;
    54      }
    55
    56      public MessageIdentity addMessage(ActiveMQMessage message) throws JMSException {
    57          MessageIdentity answer = messageStore.addMessage(message);
    58          lastMessageIdentity = answer;
    59          return answer;
    60      }
    61
    62      public void delete(MessageIdentity messageID, MessageAck ack) throws JMSException {
    63          // only called in MessagePointer and so shouldn't really delete
    64          //messageStore.removeMessage(new MessageIdentity(messageID));
    65      }
    66
    67      public boolean containsMessage(MessageIdentity messageIdentity) throws JMSException {
    68          /*** TODO: make more optimal implementation */
    69          return getMessage(messageIdentity) != null;
    70      }
    71
    72      public ActiveMQMessage getMessage(MessageIdentity messageID) throws JMSException {
    73          return messageStore.getMessage(messageID);
    74      }
    75
    76      public void registerMessageInterest(MessageIdentity messageIdentity) throws JMSException {
    77          messageStore.incrementMessageCount(messageIdentity);
    78      }
    79
    80      public void unregisterMessageInterest(MessageIdentity messageIdentity, MessageAck ack) throws JMSException {
    81          messageStore.decrementMessageCountAndMaybeDelete(messageIdentity, ack);
    82      }
    83
    84
    85      public void setLastAcknowledgedMessageID(Subscription subscription, MessageIdentity messageIdentity) throws JMSException {
    86          messageStore.setLastAcknowledgedMessageIdentity(subscription, messageIdentity);
    87      }
    88
    89      public void recoverSubscription(Subscription subscription) throws JMSException {
    90          messageStore.recoverSubscription(subscription, lastMessageIdentity);
    91      }
    92
    93      public void storeSubscription(ConsumerInfo info, Subscription subscription) throws JMSException {
    94          messageStore.setSubscriberEntry(info, subscription.getSubscriptionEntry());
    95      }
    96
    97      public void start() throws JMSException {
    98          messageStore.setMessageContainer(this);
    99          lastMessageIdentity = messageStore.getLastestMessageIdentity();
    100         messageStore.start();
    101     }
    102
    103     public void stop() throws JMSException {
    104         messageStore.stop();
    105     }
    106 }