org.codehaus.activemq.store.bdbn
Class BDbTopicMessageStore

java.lang.Object
  extended byorg.codehaus.activemq.store.bdbn.BDbMessageStore
      extended byorg.codehaus.activemq.store.bdbn.BDbTopicMessageStore
All Implemented Interfaces:
MessageStore, Service, TopicMessageStore

public class BDbTopicMessageStore
extends BDbMessageStore
implements TopicMessageStore

An implementation of TopicMessageStore using native C Berkeley DB

Version:
$Revision: 1.2 $

Constructor Summary
BDbTopicMessageStore()
           
 
Method Summary
 void decrementMessageCountAndMaybeDelete(MessageIdentity messageIdentity, MessageAck ack)
          Decrement the reference count of this message ID and if there are no more references then delete the message from persistent store (or maybe archive it off somewhere)
 MessageIdentity getLastestMessageIdentity()
          Returns the last message identity that was delivered on this container which can then be used as a checkpoint so that when new durable consumers start, we know where to checkpoint their subscriptions.
 SubscriberEntry getSubscriberEntry(ConsumerInfo info)
          Finds the subscriber entry for the given consumer info
 void incrementMessageCount(MessageIdentity messageId)
          Increments the reference count of the message ID as its been dispatched to another subscriber.
 void recoverSubscription(Subscription subscription, MessageIdentity lastDispatchedMessage)
          For the new subcription find the last acknowledged message ID and then find any new messages since then and dispatch them to the subscription.
 void setLastAcknowledgedMessageIdentity(Subscription subscription, MessageIdentity messageIdentity)
          Stores the last acknowledged messgeID for the given subscription so that we can recover and commence dispatching messages from the last checkpoint
 void setSubscriberEntry(ConsumerInfo info, SubscriberEntry subscriberEntry)
          Inserts or updates the subscriber info due to a subscription change
 void stop()
          Called to shutdown the service
 
Methods inherited from class org.codehaus.activemq.store.bdbn.BDbMessageStore
addMessage, asBytes, asBytes, createKey, extractMessage, getMessage, recover, removeMessage, setMessageContainer, start
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.codehaus.activemq.store.TopicMessageStore
setMessageContainer
 
Methods inherited from interface org.codehaus.activemq.store.MessageStore
addMessage, getMessage, recover, removeMessage
 
Methods inherited from interface org.codehaus.activemq.service.Service
start
 

Constructor Detail

BDbTopicMessageStore

public BDbTopicMessageStore()
Method Detail

incrementMessageCount

public void incrementMessageCount(MessageIdentity messageId)
                           throws JMSException
Description copied from interface: TopicMessageStore
Increments the reference count of the message ID as its been dispatched to another subscriber.

Specified by:
incrementMessageCount in interface TopicMessageStore
Parameters:
messageId -
Throws:
JMSException

decrementMessageCountAndMaybeDelete

public void decrementMessageCountAndMaybeDelete(MessageIdentity messageIdentity,
                                                MessageAck ack)
                                         throws JMSException
Description copied from interface: TopicMessageStore
Decrement the reference count of this message ID and if there are no more references then delete the message from persistent store (or maybe archive it off somewhere)

Specified by:
decrementMessageCountAndMaybeDelete in interface TopicMessageStore
Parameters:
messageIdentity -
ack -
Throws:
JMSException

setLastAcknowledgedMessageIdentity

public void setLastAcknowledgedMessageIdentity(Subscription subscription,
                                               MessageIdentity messageIdentity)
                                        throws JMSException
Description copied from interface: TopicMessageStore
Stores the last acknowledged messgeID for the given subscription so that we can recover and commence dispatching messages from the last checkpoint

Specified by:
setLastAcknowledgedMessageIdentity in interface TopicMessageStore
Parameters:
subscription -
messageIdentity -
Throws:
JMSException

recoverSubscription

public void recoverSubscription(Subscription subscription,
                                MessageIdentity lastDispatchedMessage)
Description copied from interface: TopicMessageStore
For the new subcription find the last acknowledged message ID and then find any new messages since then and dispatch them to the subscription.

If this is a new subscription then the lastDispatchMessage should be written to the acknowledgement table to write a checkpoint so that when we recover we will start from the correct point.

e.g. if we dispatched some messages to a new durable topic subscriber, then went down before acknowledging any messages, we need to know the correct point from which to recover from.

Specified by:
recoverSubscription in interface TopicMessageStore
Parameters:
subscription -
lastDispatchedMessage -

getLastestMessageIdentity

public MessageIdentity getLastestMessageIdentity()
                                          throws JMSException
Description copied from interface: TopicMessageStore
Returns the last message identity that was delivered on this container which can then be used as a checkpoint so that when new durable consumers start, we know where to checkpoint their subscriptions.

Note that this method does not need to return a valid messageID, purely the sequence number.

Specified by:
getLastestMessageIdentity in interface TopicMessageStore
Returns:
the last message identity which was persisted in the durable store or null if the store is empty.
Throws:
JMSException

getSubscriberEntry

public SubscriberEntry getSubscriberEntry(ConsumerInfo info)
                                   throws JMSException
Description copied from interface: TopicMessageStore
Finds the subscriber entry for the given consumer info

Specified by:
getSubscriberEntry in interface TopicMessageStore
Parameters:
info -
Returns:
Throws:
JMSException

setSubscriberEntry

public void setSubscriberEntry(ConsumerInfo info,
                               SubscriberEntry subscriberEntry)
                        throws JMSException
Description copied from interface: TopicMessageStore
Inserts or updates the subscriber info due to a subscription change

Specified by:
setSubscriberEntry in interface TopicMessageStore
Parameters:
info -
subscriberEntry -
Throws:
JMSException

stop

public void stop()
          throws JMSException
Description copied from interface: Service
Called to shutdown the service

Specified by:
stop in interface Service
Overrides:
stop in class BDbMessageStore
Throws:
JMSException


Copyright © 2004 Protique, Ltd.. All Rights Reserved.