Package org.apache.activemq.store

Interface TopicReferenceStore

All Superinterfaces:

MessageStore, ReferenceStore, Service, TopicMessageStore

public interface TopicReferenceStore
extends ReferenceStore, TopicMessageStore

A MessageStore for durable topic subscriptions

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.activemq.store.ReferenceStore

ReferenceStore.ReferenceData

Method Summary

Modifier and Type	Method	Description
boolean	acknowledgeReference(ConnectionContext context, String clientId, String subscriptionName, MessageId messageId)	Removes the last acknowledged messgeID for the given subscription so that we can recover and commence dispatching messages from the last checkpoint N.B.
void	addSubsciption(SubscriptionInfo subscriptionInfo, boolean retroactive)	Inserts the subscriber info due to a subscription change
void	deleteSubscription(String clientId, String subscriptionName)
SubscriptionInfo[]	getAllSubscriptions()	Lists all the durable subscriptions for a given destination.
int	getMessageCount(String clientId, String subscriberName)	Get the number of messages ready to deliver from the store to a durable subscriber
SubscriptionInfo	lookupSubscription(String clientId, String subscriptionName)	Finds the subscriber entry for the given consumer info
void	recoverNextMessages(String clientId, String subscriptionName, int maxReturned, MessageRecoveryListener listener)	For an active subscription - retrieve messages from the store for the subscriber after the lastMessageId messageId
void	recoverSubscription(String clientId, String subscriptionName, MessageRecoveryListener listener)	For the new subscription find the last acknowledged message ID and then find any new messages since then and dispatch them to the subscription.
void	resetBatching(String clientId, String subscriptionName)	A hint to the Store to reset any batching state for a durable subsriber

Methods inherited from interface org.apache.activemq.store.MessageStore

addMessage, addMessage, asyncAddQueueMessage, asyncAddQueueMessage, asyncAddTopicMessage, asyncAddTopicMessage, dispose, getDestination, getMessage, getMessageCount, getMessageSize, getMessageStoreStatistics, isEmpty, isPrioritizedMessages, recover, recoverNextMessages, registerIndexListener, removeAllMessages, removeAsyncMessage, removeMessage, resetBatching, setMemoryUsage, setPrioritizedMessages, updateMessage

Methods inherited from interface org.apache.activemq.store.ReferenceStore

addMessageReference, getMessageReference, getStoreLock, setBatch, supportsExternalBatchControl

Methods inherited from interface org.apache.activemq.Service

start, stop

Methods inherited from interface org.apache.activemq.store.TopicMessageStore

acknowledge, addSubscription, getMessageSize, getMessageStoreSubStatistics

Method Detail

acknowledgeReference

boolean acknowledgeReference(ConnectionContext context,
                             String clientId,
                             String subscriptionName,
                             MessageId messageId)
                      throws IOException

Removes the last acknowledged messgeID for the given subscription so that we can recover and commence dispatching messages from the last checkpoint N.B. - all messages previous to this one for a given subscriber should also be acknowledged

Parameters:

context -

clientId -

subscriptionName -

messageId -

Returns:

true if there are no more references to the message - or the message is null

Throws:

IOException

deleteSubscription

void deleteSubscription(String clientId,
                        String subscriptionName)
                 throws IOException

Specified by:

deleteSubscription in interface TopicMessageStore

Parameters:

clientId -

subscriptionName -

Throws:

IOException

JMSException

recoverSubscription

void recoverSubscription(String clientId,
                         String subscriptionName,
                         MessageRecoveryListener listener)
                  throws Exception

For the new subscription find the last acknowledged message ID and then find any new messages since then and dispatch them to the subscription.

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:

clientId -

subscriptionName -

listener -

Throws:

Exception

recoverNextMessages

void recoverNextMessages(String clientId,
                         String subscriptionName,
                         int maxReturned,
                         MessageRecoveryListener listener)
                  throws Exception

For an active subscription - retrieve messages from the store for the subscriber after the lastMessageId messageId

Specified by:

recoverNextMessages in interface TopicMessageStore

Parameters:

clientId -

subscriptionName -

maxReturned -

listener -

Throws:

Exception

resetBatching

void resetBatching(String clientId,
                   String subscriptionName)

A hint to the Store to reset any batching state for a durable subsriber

Specified by:

resetBatching in interface TopicMessageStore

Parameters:

clientId -

subscriptionName -

getMessageCount

int getMessageCount(String clientId,
                    String subscriberName)
             throws IOException

Get the number of messages ready to deliver from the store to a durable subscriber

Specified by:

getMessageCount in interface TopicMessageStore

Parameters:

clientId -

subscriberName -

Returns:

the outstanding message count

Throws:

IOException

lookupSubscription

SubscriptionInfo lookupSubscription(String clientId,
                                    String subscriptionName)
                             throws IOException

Finds the subscriber entry for the given consumer info

Specified by:

lookupSubscription in interface TopicMessageStore

Parameters:

clientId -

subscriptionName -

Returns:

the SubscriptionInfo

Throws:

IOException

getAllSubscriptions

SubscriptionInfo[] getAllSubscriptions()
                                throws IOException

Lists all the durable subscriptions for a given destination.

Specified by:

getAllSubscriptions in interface TopicMessageStore

Returns:

an array SubscriptionInfos

Throws:

IOException

addSubsciption

void addSubsciption(SubscriptionInfo subscriptionInfo,
                    boolean retroactive)
             throws IOException

Inserts the subscriber info due to a subscription change

If this is a new subscription and the retroactive is false, then the last message sent to the topic should be set as the last message acknowledged by they new subscription. Otherwise, if retroactive is true, then create the subscription without it having an acknowledged message so that on recovery, all message recorded for the topic get replayed.

Parameters:

subscriptionInfo -

retroactive -

Throws:

IOException