org.apache.activemq.broker.region.cursors

Class VMPendingMessageCursor

java.lang.Object

org.apache.activemq.broker.region.cursors.AbstractPendingMessageCursor

org.apache.activemq.broker.region.cursors.VMPendingMessageCursor

All Implemented Interfaces:

PendingMessageCursor, Service

public class VMPendingMessageCursor
extends AbstractPendingMessageCursor

hold pending messages in a linked list (messages awaiting disptach to a consumer) cursor

Field Summary

Fields inherited from class org.apache.activemq.broker.region.cursors.AbstractPendingMessageCursor

audit, cacheEnabled, enableAudit, last, maxAuditDepth, maxBatchSize, maxProducersToAudit, memoryUsageHighWaterMark, prioritizedMessages, systemUsage, useCache

Constructor Summary

Constructors

Constructor and Description
VMPendingMessageCursor(boolean prioritizedMessages)

Method Summary

Methods

Modifier and Type	Method and Description
void	addMessageFirst(MessageReference node) add message to await dispatch
boolean	addMessageLast(MessageReference node) add message to await dispatch
void	clear() clear all pending messages
void	destroy() destroy the cursor
boolean	hasNext()
boolean	isEmpty()
boolean	isTransient()
MessageReference	next()
LinkedList<MessageReference>	pageInList(int maxItems) Page in a restricted number of messages
void	remove() remove the message at the cursor position
List<MessageReference>	remove(ConnectionContext context, Destination destination) remove a destination
void	remove(MessageReference node) remove a node
void	reset() reset the cursor
int	size()

Methods inherited from class org.apache.activemq.broker.region.cursors.AbstractPendingMessageCursor

add, addRecoveredMessage, fillBatch, gc, getMaxAuditDepth, getMaxBatchSize, getMaxProducersToAudit, getMemoryUsageHighWaterMark, getMessageAudit, getSystemUsage, hasMessagesBufferedToDeliver, hasSpace, isCacheEnabled, isDuplicate, isEmpty, isEnableAudit, isFull, isPrioritizedMessageSubscriber, isRecoveryRequired, isStarted, isUseCache, rebase, recordUniqueId, release, resetForGC, rollback, setCacheEnabled, setEnableAudit, setMaxAuditDepth, setMaxBatchSize, setMaxProducersToAudit, setMemoryUsageHighWaterMark, setMessageAudit, setSystemUsage, setUseCache, start, stop, tryAddMessageLast

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

VMPendingMessageCursor

public VMPendingMessageCursor(boolean prioritizedMessages)

Method Detail

remove

public List<MessageReference> remove(ConnectionContext context,
                            Destination destination)
                              throws Exception

Description copied from interface: PendingMessageCursor

remove a destination

Specified by:

remove in interface PendingMessageCursor

Overrides:

remove in class AbstractPendingMessageCursor

Throws:

Exception

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface PendingMessageCursor

Overrides:

isEmpty in class AbstractPendingMessageCursor

Returns:

true if there are no pending messages

reset

public void reset()

reset the cursor

Specified by:

reset in interface PendingMessageCursor

Overrides:

reset in class AbstractPendingMessageCursor

addMessageLast

public boolean addMessageLast(MessageReference node)

add message to await dispatch

Specified by:

addMessageLast in interface PendingMessageCursor

Overrides:

addMessageLast in class AbstractPendingMessageCursor

Parameters:

node -

Returns:

boolean true if successful, false if cursor traps a duplicate

addMessageFirst

public void addMessageFirst(MessageReference node)

add message to await dispatch

Specified by:

addMessageFirst in interface PendingMessageCursor

Overrides:

addMessageFirst in class AbstractPendingMessageCursor

Parameters:

node -

hasNext

public boolean hasNext()

Specified by:

hasNext in interface PendingMessageCursor

Overrides:

hasNext in class AbstractPendingMessageCursor

Returns:

true if there pending messages to dispatch

next

public MessageReference next()

Specified by:

next in interface PendingMessageCursor

Overrides:

next in class AbstractPendingMessageCursor

Returns:

the next pending message

remove

public void remove()

remove the message at the cursor position

Specified by:

remove in interface PendingMessageCursor

Overrides:

remove in class AbstractPendingMessageCursor

size

public int size()

Specified by:

size in interface PendingMessageCursor

Overrides:

size in class AbstractPendingMessageCursor

Returns:

the number of pending messages

clear

public void clear()

clear all pending messages

Specified by:

clear in interface PendingMessageCursor

Overrides:

clear in class AbstractPendingMessageCursor

remove

public void remove(MessageReference node)

Description copied from interface: PendingMessageCursor

remove a node

Specified by:

remove in interface PendingMessageCursor

Overrides:

remove in class AbstractPendingMessageCursor

pageInList

public LinkedList<MessageReference> pageInList(int maxItems)

Page in a restricted number of messages

Specified by:

pageInList in interface PendingMessageCursor

Overrides:

pageInList in class AbstractPendingMessageCursor

Parameters:

maxItems -

Returns:

a list of paged in messages

isTransient

public boolean isTransient()

Specified by:

isTransient in interface PendingMessageCursor

Overrides:

isTransient in class AbstractPendingMessageCursor

Returns:

true if the underlying state of this cursor disappears when the broker shuts down

destroy

public void destroy()
             throws Exception

Description copied from class: AbstractPendingMessageCursor

destroy the cursor

Specified by:

destroy in interface PendingMessageCursor

Overrides:

destroy in class AbstractPendingMessageCursor

Throws:

Exception