org.apache.activemq.broker.region.cursors

Class QueueDispatchPendingList

java.lang.Object

org.apache.activemq.broker.region.cursors.QueueDispatchPendingList

All Implemented Interfaces:

Iterable<MessageReference>, PendingList

public class QueueDispatchPendingList
extends Object
implements PendingList

An abstraction that keeps the correct order of messages that need to be dispatched to consumers, but also hides the fact that there might be redelivered messages that should be dispatched ahead of any other paged in messages. Direct usage of this class is recommended as you can control when redeliveries need to be added vs regular pending messages (the next set of messages that can be dispatched) Created by ceposta

Constructor Summary

Constructors

Constructor and Description
QueueDispatchPendingList()

Method Summary

Methods

Modifier and Type	Method and Description
void	addAll(PendingList pendingList) Adds all the elements of the given PendingList to this PendingList.
void	addForRedelivery(List<MessageReference> list, boolean noConsumers)
PendingNode	addMessageFirst(MessageReference message) Messages added are added directly to the pagedInPendingDispatch set of messages.
PendingNode	addMessageLast(MessageReference message) Messages added are added directly to the pagedInPendingDispatch set of messages.
void	clear() Discards all Messages currently held in the PendingList.
boolean	contains(MessageReference message) Query the PendingList to determine if the given message is contained within.
MessageReference	get(MessageId messageId)
boolean	hasRedeliveries()
boolean	isEmpty() Returns true if there are no Messages in the PendingList currently.
Iterator<MessageReference>	iterator() Returns an iterator over the pending Messages.
PendingNode	remove(MessageReference message) Removes the given MessageReference from the PendingList if it is contained within.
void	setPrioritizedMessages(boolean prioritizedMessages)
int	size() Returns the number of MessageReferences that are awaiting dispatch.
Collection<MessageReference>	values() Returns a new Collection that contains all the MessageReferences currently held in this PendingList.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueueDispatchPendingList

public QueueDispatchPendingList()

Method Detail

isEmpty

public boolean isEmpty()

Description copied from interface: PendingList

Returns true if there are no Messages in the PendingList currently.

Specified by:

isEmpty in interface PendingList

Returns:

true if the PendingList is currently empty.

clear

public void clear()

Description copied from interface: PendingList

Discards all Messages currently held in the PendingList.

Specified by:

clear in interface PendingList

addMessageFirst

public PendingNode addMessageFirst(MessageReference message)

Messages added are added directly to the pagedInPendingDispatch set of messages. If you're trying to add a message that is marked redelivered add it using addMessageForRedelivery() method

Specified by:

addMessageFirst in interface PendingList

Parameters:

message - The MessageReference that is to be added to this list.

Returns:

addMessageLast

public PendingNode addMessageLast(MessageReference message)

Messages added are added directly to the pagedInPendingDispatch set of messages. If you're trying to add a message that is marked redelivered add it using addMessageForRedelivery() method

Specified by:

addMessageLast in interface PendingList

Parameters:

message - The MessageReference that is to be added to this list.

Returns:

remove

public PendingNode remove(MessageReference message)

Description copied from interface: PendingList

Removes the given MessageReference from the PendingList if it is contained within.

Specified by:

remove in interface PendingList

Parameters:

message - The MessageReference that is to be removed to this list.

Returns:

the PendingNode that contains the removed message or null if the message was not present in this list.

size

public int size()

Description copied from interface: PendingList

Returns the number of MessageReferences that are awaiting dispatch.

Specified by:

size in interface PendingList

Returns:

current count of the pending messages.

iterator

public Iterator<MessageReference> iterator()

Description copied from interface: PendingList

Returns an iterator over the pending Messages. The subclass controls how the returned iterator actually traverses the list of pending messages allowing for the order to vary based on factors like Message priority or some other mechanism.

Specified by:

iterator in interface Iterable<MessageReference>

Specified by:

iterator in interface PendingList

Returns:

an Iterator that returns MessageReferences contained in this list.

contains

public boolean contains(MessageReference message)

Description copied from interface: PendingList

Query the PendingList to determine if the given message is contained within.

Specified by:

contains in interface PendingList

Parameters:

message - The Message that is the target of this query.

Returns:

true if the MessageReference is contained in this list.

values

public Collection<MessageReference> values()

Description copied from interface: PendingList

Returns a new Collection that contains all the MessageReferences currently held in this PendingList. The elements of the list are ordered using the same rules as the subclass uses for iteration.

Specified by:

values in interface PendingList

Returns:

a new Collection containing this lists MessageReferences.

addAll

public void addAll(PendingList pendingList)

Description copied from interface: PendingList

Adds all the elements of the given PendingList to this PendingList.

Specified by:

addAll in interface PendingList

Parameters:

pendingList - The PendingList that is to be added to this collection.

get

public MessageReference get(MessageId messageId)

Specified by:

get in interface PendingList

setPrioritizedMessages

public void setPrioritizedMessages(boolean prioritizedMessages)

hasRedeliveries

public boolean hasRedeliveries()

addForRedelivery

public void addForRedelivery(List<MessageReference> list,
                    boolean noConsumers)

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