BDbTopicMessageStore 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.store.bdb;
    19
    20  import com.sleepycat.je.Database;
    21  import com.sleepycat.je.DatabaseEntry;
    22  import com.sleepycat.je.DatabaseException;
    23  import com.sleepycat.je.LockMode;
    24  import com.sleepycat.je.OperationStatus;
    25  import com.sleepycat.je.SecondaryConfig;
    26  import com.sleepycat.je.SecondaryCursor;
    27  import com.sleepycat.je.SecondaryDatabase;
    28  import com.sleepycat.je.Transaction;
    29  import org.apache.commons.logging.Log;
    30  import org.apache.commons.logging.LogFactory;
    31  import org.codehaus.activemq.message.ActiveMQMessage;
    32  import org.codehaus.activemq.message.ConsumerInfo;
    33  import org.codehaus.activemq.message.MessageAck;
    34  import org.codehaus.activemq.message.WireFormat;
    35  import org.codehaus.activemq.service.MessageIdentity;
    36  import org.codehaus.activemq.service.SubscriberEntry;
    37  import org.codehaus.activemq.service.Subscription;
    38  import org.codehaus.activemq.store.TopicMessageStore;
    39  import org.codehaus.activemq.util.JMSExceptionHelper;
    40
    41  import javax.jms.JMSException;
    42  import java.io.IOException;
    43
    44  /***
    45   * @version $Revision: 1.2 $
    46   */
    47  public class BDbTopicMessageStore extends BDbMessageStore implements TopicMessageStore {
    48      private static final Log log = LogFactory.getLog(BDbTopicMessageStore.class);
    49
    50      private Database subscriptionDatabase;
    51
    52      public BDbTopicMessageStore(Database database, SecondaryDatabase secondaryDatabase, SecondaryConfig secondaryConfig, SequenceNumberCreator sequenceNumberCreator, WireFormat wireFormat, Database subscriptionDatabase) {
    53          super(database, secondaryDatabase, secondaryConfig, sequenceNumberCreator, wireFormat);
    54          this.subscriptionDatabase = subscriptionDatabase;
    55      }
    56
    57      public void incrementMessageCount(MessageIdentity messageId) {
    58          /*** TODO */
    59      }
    60
    61      public void decrementMessageCountAndMaybeDelete(MessageIdentity messageIdentity, MessageAck ack) {
    62          /*** TODO */
    63      }
    64
    65      public void setLastAcknowledgedMessageIdentity(Subscription subscription, MessageIdentity messageIdentity) throws JMSException {
    66          checkClosed();
    67          try {
    68              doSetLastAcknowledgedMessageIdentity(subscription, messageIdentity);
    69          }
    70          catch (DatabaseException e) {
    71              throw JMSExceptionHelper.newJMSException("Failed to update last acknowledge messageID for : "
    72                      + messageIdentity + ". Reason: " + e, e);
    73          }
    74      }
    75
    76
    77      public void recoverSubscription(Subscription subscription, MessageIdentity lastDispatchedMessage) throws JMSException {
    78          checkClosed();
    79          SecondaryCursor cursor = null;
    80          try {
    81              DatabaseEntry lastAckKey = getLastAcknowledgedMessageID(subscription, lastDispatchedMessage);
    82              if (lastAckKey != null) {
    83                  cursor = getSecondaryDatabase().openSecondaryCursor(BDbHelper.getTransaction(), getCursorConfig());
    84                  DatabaseEntry valueEntry = new DatabaseEntry();
    85                  OperationStatus status = cursor.getSearchKey(lastAckKey, valueEntry, LockMode.DEFAULT);
    86                  if (status != OperationStatus.SUCCESS) {
    87                      log.error("Could not find the last acknowledged record for: " + subscription + ". Status: " + status);
    88                  }
    89                  else {
    90                      while (true) {
    91                          // lets pass straight over the first entry, which we've already ack'd
    92                          status = cursor.getNext(lastAckKey, valueEntry, LockMode.DEFAULT);
    93                          if (status != OperationStatus.SUCCESS) {
    94                              if (status != OperationStatus.NOTFOUND) {
    95                                  log.warn("Strange result when iterating to end of collection: " + status);
    96                              }
    97                              break;
    98                          }
    99
    100                         ActiveMQMessage message = extractMessage(valueEntry);
    101                         subscription.addMessage(getContainer(), message);
    102                     }
    103                 }
    104             }
    105         }
    106         catch (DatabaseException e) {
    107             throw JMSExceptionHelper.newJMSException("Unable to recover topic subscription for: "
    108                     + subscription + ". Reason: " + e, e);
    109         }
    110         catch (IOException e) {
    111             throw JMSExceptionHelper.newJMSException("Unable to recover topic subscription for: "
    112                     + subscription + ". Reason: " + e, e);
    113         }
    114         finally {
    115             if (cursor != null) {
    116                 try {
    117                     cursor.close();
    118                 }
    119                 catch (DatabaseException e) {
    120                     log.warn("Caught exception closing cursor: " + e, e);
    121                 }
    122             }
    123         }
    124     }
    125
    126     public MessageIdentity getLastestMessageIdentity() throws JMSException {
    127         checkClosed();
    128         SecondaryCursor cursor = null;
    129         try {
    130             cursor = getSecondaryDatabase().openSecondaryCursor(BDbHelper.getTransaction(), getCursorConfig());
    131             DatabaseEntry keyEntry = new DatabaseEntry();
    132             DatabaseEntry valueEntry = new DatabaseEntry();
    133             OperationStatus status = cursor.getLast(keyEntry, valueEntry, LockMode.DEFAULT);
    134             if (status == OperationStatus.SUCCESS) {
    135                 if (log.isDebugEnabled()) {
    136                     log.debug("Loaded last sequence number of: " + BDbHelper.longFromBytes(keyEntry.getData()));
    137                 }
    138                 return new MessageIdentity(null, keyEntry);
    139             }
    140             else if (status != OperationStatus.NOTFOUND) {
    141                 log.error("Could not find the last sequence number. Status: " + status);
    142             }
    143             return null;
    144         }
    145         catch (DatabaseException e) {
    146             throw JMSExceptionHelper.newJMSException("Unable to load the last sequence number. Reason: " + e, e);
    147         }
    148         finally {
    149             if (cursor != null) {
    150                 try {
    151                     cursor.close();
    152                 }
    153                 catch (DatabaseException e) {
    154                     log.warn("Caught exception closing cursor: " + e, e);
    155                 }
    156             }
    157         }
    158     }
    159
    160     public SubscriberEntry getSubscriberEntry(ConsumerInfo info) throws JMSException {
    161         return null;  /*** TODO */
    162     }
    163
    164     public void setSubscriberEntry(ConsumerInfo info, SubscriberEntry subscriberEntry) throws JMSException {
    165         /*** TODO */
    166     }
    167
    168     public synchronized void stop() throws JMSException {
    169         JMSException firstException = BDbPersistenceAdapter.closeDatabase(subscriptionDatabase, null);
    170         subscriptionDatabase = null;
    171         super.stop();
    172         if (firstException != null) {
    173             throw JMSExceptionHelper.newJMSException("Unable to close the subscription database: " + firstException, firstException);
    174         }
    175     }
    176
    177     // Implementation methods
    178     //-------------------------------------------------------------------------
    179
    180     protected DatabaseEntry getLastAcknowledgedMessageID(Subscription subscription, MessageIdentity lastDispatchedMessage) throws DatabaseException {
    181         DatabaseEntry key = createKey(subscription.getPersistentKey());
    182         DatabaseEntry value = new DatabaseEntry();
    183         OperationStatus status = subscriptionDatabase.get(null, key, value, null);
    184         if (status == OperationStatus.SUCCESS) {
    185             return value;
    186         }
    187         else if (status == OperationStatus.NOTFOUND) {
    188             // we need to insert the new entry
    189             if (lastDispatchedMessage != null) {
    190                 return doSetLastAcknowledgedMessageIdentity(subscription, lastDispatchedMessage);
    191             }
    192         }
    193         else {
    194             log.warn("Unexpected status return from querying lastAcknowledgeSequenceNumber for: " + subscription + " status: " + status);
    195         }
    196         return null;
    197     }
    198
    199     protected DatabaseEntry doSetLastAcknowledgedMessageIdentity(Subscription subscription, MessageIdentity messageIdentity) throws DatabaseException {
    200         Transaction transaction = BDbHelper.getTransaction();
    201         DatabaseEntry key = createKey(subscription.getPersistentKey());
    202         DatabaseEntry value = getSequenceNumberKey(messageIdentity);
    203         subscriptionDatabase.put(transaction, key, value);
    204         return value;
    205     }
    206 }