org.apache.activemq.artemis.core.server.impl

Class LastValueQueue

java.lang.Object

org.apache.activemq.artemis.utils.critical.CriticalComponentImpl

org.apache.activemq.artemis.core.server.impl.QueueImpl

org.apache.activemq.artemis.core.server.impl.LastValueQueue

All Implemented Interfaces:

Bindable, Queue, CriticalComponent

public class LastValueQueue
extends QueueImpl

A queue that will discard messages if a newer message with the same Message.HDR_LAST_VALUE_NAME property value. In other words it only retains the last value

This is useful for example, for stock prices, where you're only interested in the latest value for a particular stock

Field Summary

Fields inherited from class org.apache.activemq.artemis.core.server.impl.QueueImpl

CHECK_QUEUE_SIZE_PERIOD, CRITICAL_CONSUMER, CRITICAL_DELIVER, CRITICAL_PATH_ADD_HEAD, CRITICAL_PATH_ADD_TAIL, CRITICAL_PATHS, DEFAULT_FLUSH_LIMIT, DELIVERY_TIMEOUT, MAX_DELIVERIES_IN_LOOP, NUM_PRIORITIES, REDISTRIBUTOR_BATCH_SIZE

Fields inherited from interface org.apache.activemq.artemis.core.server.Queue

MAX_CONSUMERS_UNLIMITED

Constructor Summary

Constructors

Constructor and Description

LastValueQueue(long persistenceID, SimpleString address, SimpleString name, Filter filter, PageSubscription pageSubscription, SimpleString user, boolean durable, boolean temporary, boolean autoCreated, RoutingType routingType, Integer maxConsumers, Boolean exclusive, Boolean purgeOnNoConsumers, ScheduledExecutorService scheduledExecutor, PostOffice postOffice, StorageManager storageManager, HierarchicalRepository<AddressSettings> addressSettingsRepository, ArtemisExecutor executor, ActiveMQServer server, QueueFactory factory)

Method Summary

Modifier and Type	Method and Description
void	addHead(MessageReference ref, boolean scheduling)
void	addTail(MessageReference ref, boolean direct)
boolean	equals(Object obj)
int	hashCode()
boolean	isLastValue()
protected void	refRemoved(MessageReference ref)

Methods inherited from class org.apache.activemq.artemis.core.server.impl.QueueImpl

acknowledge, acknowledge, acknowledge, acknowledge, acknowledge, addConsumer, addHead, addRedistributor, addTail, browserIterator, cancel, cancel, cancel, cancelRedistributor, changeReferencePriority, changeReferencesPriority, checkRedelivery, close, debug, decDelivering, deleteAllReferences, deleteAllReferences, deleteMatchingReferences, deleteMatchingReferences, deleteQueue, deleteQueue, deleteReference, deliverAsync, deliverNow, deliverScheduledMessages, destroyPaging, expire, expire, expireReference, expireReferences, expireReferences, finalize, flushExecutor, forceDelivery, getAddress, getConsumerCount, getConsumers, getConsumersRefCount, getDeliveringCount, getDeliveringMessages, getDeliveringSize, getDurableDeliveringCount, getDurableDeliveringSize, getDurableMessageCount, getDurablePersistentSize, getDurableScheduledCount, getDurableScheduledSize, getExecutor, getExpiryAddress, getFilter, getGroupCount, getGroups, getGroupsUsed, getID, getMaxConsumers, getMessageCount, getMessagesAcknowledged, getMessagesAdded, getMessagesExpired, getMessagesKilled, getName, getNumberOfReferences, getPageSubscription, getPersistentSize, getRate, getReference, getRoutingName, getRoutingType, getScheduledCount, getScheduledMessages, getScheduledSize, getUniqueName, getUser, hasMatchingConsumer, incrementMesssagesAdded, isAutoCreated, isDirectDeliver, isDurable, isDurableMessage, isExclusive, isExpirationRedundant, isInternalQueue, isPaused, isPersistedPause, isPurgeOnNoConsumers, isTemporary, iterator, moveReference, moveReferences, moveReferences, moveReferencesBetweenSnFQueues, pause, pause, postAcknowledge, reacknowledge, recheckRefCount, refAdded, referenceHandled, reload, reloadPause, removeConsumer, removeReferenceWithID, resetAllGroups, resetAllIterators, resetGroup, resetMessagesAcknowledged, resetMessagesAdded, resetMessagesExpired, resetMessagesKilled, resume, retryMessages, route, routeWithAck, scheduleIfPossible, sendMessagesToDeadLetterAddress, sendMessageToDeadLetterAddress, sendToDeadLetterAddress, setConsumersRefCount, setExclusive, setInternalQueue, setMaxConsumer, setPurgeOnNoConsumers, setRoutingType, toString, unproposed

Methods inherited from class org.apache.activemq.artemis.utils.critical.CriticalComponentImpl

enterCritical, getCriticalAnalyzer, isExpired, leaveCritical

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.activemq.artemis.core.server.Queue

deleteMatchingReferences

Methods inherited from interface org.apache.activemq.artemis.utils.critical.CriticalComponent

enterCritical, isExpired, leaveCritical

Constructor Detail

LastValueQueue

public LastValueQueue(long persistenceID,
                      SimpleString address,
                      SimpleString name,
                      Filter filter,
                      PageSubscription pageSubscription,
                      SimpleString user,
                      boolean durable,
                      boolean temporary,
                      boolean autoCreated,
                      RoutingType routingType,
                      Integer maxConsumers,
                      Boolean exclusive,
                      Boolean purgeOnNoConsumers,
                      ScheduledExecutorService scheduledExecutor,
                      PostOffice postOffice,
                      StorageManager storageManager,
                      HierarchicalRepository<AddressSettings> addressSettingsRepository,
                      ArtemisExecutor executor,
                      ActiveMQServer server,
                      QueueFactory factory)

Method Detail

addTail

public void addTail(MessageReference ref,
                    boolean direct)

Specified by:

addTail in interface Queue

Overrides:

addTail in class QueueImpl

addHead

public void addHead(MessageReference ref,
                    boolean scheduling)

Specified by:

addHead in interface Queue

Overrides:

addHead in class QueueImpl

refRemoved

protected void refRemoved(MessageReference ref)

Overrides:

refRemoved in class QueueImpl

isLastValue

public boolean isLastValue()

Specified by:

isLastValue in interface Queue

Overrides:

isLastValue in class QueueImpl

hashCode

public int hashCode()

Overrides:

hashCode in class QueueImpl

equals

public boolean equals(Object obj)

Overrides:

equals in class QueueImpl