Package org.apache.activemq.broker.region

Class AbstractSubscription

java.lang.Object

org.apache.activemq.broker.region.AbstractSubscription

All Implemented Interfaces:

Subscription, SubscriptionRecovery

Direct Known Subclasses:

PrefetchSubscription, TopicSubscription

public abstract class AbstractSubscription
extends Object
implements Subscription

Field Summary

Fields

Modifier and Type	Field	Description
protected Broker	broker
protected ConnectionContext	context
protected org.apache.activemq.filter.DestinationFilter	destinationFilter
protected CopyOnWriteArrayList<Destination>	destinations
protected org.apache.activemq.command.ConsumerInfo	info
protected AtomicInteger	prefetchExtension

Constructor Summary

Constructors

Constructor	Description
AbstractSubscription(Broker broker, ConnectionContext context, org.apache.activemq.command.ConsumerInfo info)

Method Summary

Modifier and Type	Method	Description
void	acknowledge(ConnectionContext context, org.apache.activemq.command.MessageAck ack)	Used when client acknowledge receipt of dispatched message.
void	add(ConnectionContext context, Destination destination)	The subscription will be receiving messages from the destination.
void	addDestination(Destination destination)	Add a destination
boolean	addRecoveredMessage(ConnectionContext context, org.apache.activemq.broker.region.MessageReference message)	Add a message to the SubscriptionRecovery
protected void	contractPrefetchExtension(int amount)
int	countBeforeFull()
protected void	decrementPrefetchExtension(int amount)
protected void	doAddRecoveredMessage(org.apache.activemq.broker.region.MessageReference message)
protected void	expandPrefetchExtension(int amount)
void	gc()	The subscription should release as may references as it can to help the garbage collector reclaim memory.
org.apache.activemq.command.ActiveMQDestination	getActiveMQDestination()
long	getConsumedCount()
org.apache.activemq.command.ConsumerInfo	getConsumerInfo()	The ConsumerInfo object that created the subscription.
ConnectionContext	getContext()
int	getCursorMemoryHighWaterMark()
CopyOnWriteArrayList<Destination>	getDestinations()
long	getInFlightMessageSize()
int	getInFlightUsage()
org.apache.activemq.command.ConsumerInfo	getInfo()
ObjectName	getObjectName()
AtomicInteger	getPrefetchExtension()
int	getPrefetchSize()
String	getSelector()
org.apache.activemq.filter.BooleanExpression	getSelectorExpression()
SubscriptionStatistics	getSubscriptionStatistics()
long	getTimeOfLastMessageAck()	Returns the time since the last Ack message was received by this subscription.
void	incrementConsumedCount()
boolean	isBrowser()
boolean	isRecoveryRequired()	Informs the Broker if the subscription needs to intervention to recover it's state e.g.
boolean	isSlowConsumer()
boolean	isUsePrefetchExtension()
boolean	isWildcard()	Returns true if this subscription is a Wildcard subscription.
boolean	matches(org.apache.activemq.broker.region.MessageReference node, org.apache.activemq.filter.MessageEvaluationContext context)	Is the subscription interested in the message?
boolean	matches(org.apache.activemq.command.ActiveMQDestination destination)	Is the subscription interested in messages in the destination?
List<org.apache.activemq.broker.region.MessageReference>	remove(ConnectionContext context, Destination destination)	The subscription will be no longer be receiving messages from the destination.
void	removeDestination(Destination destination)	Remove a destination
void	resetConsumedCount()
void	setCursorMemoryHighWaterMark(int cursorMemoryHighWaterMark)
void	setObjectName(ObjectName objectName)	Set when the subscription is registered in JMX
void	setPrefetchSize(int newSize)
void	setSelector(String selector)	Attempts to change the current active selector on the subscription.
void	setSlowConsumer(boolean val)
void	setTimeOfLastMessageAck(long value)
void	setUsePrefetchExtension(boolean usePrefetchExtension)
void	unmatched(org.apache.activemq.broker.region.MessageReference node)
void	wakeupDestinationsForDispatch()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.activemq.broker.region.Subscription

add, destroy, getDequeueCounter, getDispatchedCounter, getDispatchedQueueSize, getEnqueueCounter, getInFlightSize, getPendingMessageSize, getPendingQueueSize, isFull, isHighWaterMark, isLowWaterMark, processMessageDispatchNotification, pullMessage, updateConsumerPrefetch

Field Detail

broker

protected Broker broker

context

protected ConnectionContext context

info

protected org.apache.activemq.command.ConsumerInfo info

destinationFilter

protected final org.apache.activemq.filter.DestinationFilter destinationFilter

destinations

protected final CopyOnWriteArrayList<Destination> destinations

prefetchExtension

protected final AtomicInteger prefetchExtension

Constructor Detail

AbstractSubscription

public AbstractSubscription(Broker broker,
                            ConnectionContext context,
                            org.apache.activemq.command.ConsumerInfo info)
                     throws InvalidSelectorException

Throws:

InvalidSelectorException

Method Detail

acknowledge

public void acknowledge(ConnectionContext context,
                        org.apache.activemq.command.MessageAck ack)
                 throws Exception

Description copied from interface: Subscription

Used when client acknowledge receipt of dispatched message.

Specified by:

acknowledge in interface Subscription

Throws:

IOException

Exception

matches

public boolean matches(org.apache.activemq.broker.region.MessageReference node,
                       org.apache.activemq.filter.MessageEvaluationContext context)
                throws IOException

Description copied from interface: Subscription

Is the subscription interested in the message?

Specified by:

matches in interface Subscription

Returns:

true if matching

Throws:

IOException

isWildcard

public boolean isWildcard()

Description copied from interface: Subscription

Returns true if this subscription is a Wildcard subscription.

Specified by:

isWildcard in interface Subscription

Returns:

true if wildcard subscription.

matches

public boolean matches(org.apache.activemq.command.ActiveMQDestination destination)

Description copied from interface: Subscription

Is the subscription interested in messages in the destination?

Specified by:

matches in interface Subscription

Returns:

true if matching

add

public void add(ConnectionContext context,
                Destination destination)
         throws Exception

Description copied from interface: Subscription

The subscription will be receiving messages from the destination.

Specified by:

add in interface Subscription

Throws:

Exception

remove

public List<org.apache.activemq.broker.region.MessageReference> remove(ConnectionContext context,
                                                                       Destination destination)
                                                                throws Exception

Description copied from interface: Subscription

The subscription will be no longer be receiving messages from the destination.

Specified by:

remove in interface Subscription

Returns:

a list of un-acked messages that were added to the subscription.

Throws:

Exception

getConsumerInfo

public org.apache.activemq.command.ConsumerInfo getConsumerInfo()

Description copied from interface: Subscription

The ConsumerInfo object that created the subscription.

Specified by:

getConsumerInfo in interface Subscription

gc

public void gc()

Description copied from interface: Subscription

The subscription should release as may references as it can to help the garbage collector reclaim memory.

Specified by:

gc in interface Subscription

getContext

public ConnectionContext getContext()

Specified by:

getContext in interface Subscription

getInfo

public org.apache.activemq.command.ConsumerInfo getInfo()

getSelectorExpression

public org.apache.activemq.filter.BooleanExpression getSelectorExpression()

getSelector

public String getSelector()

Specified by:

getSelector in interface Subscription

Returns:

the JMS selector on the current subscription

setSelector

public void setSelector(String selector)
                 throws InvalidSelectorException

Description copied from interface: Subscription

Attempts to change the current active selector on the subscription. This operation is not supported for persistent topics.

Specified by:

setSelector in interface Subscription

Throws:

InvalidSelectorException

getObjectName

public ObjectName getObjectName()

Specified by:

getObjectName in interface Subscription

Returns:

the JMX object name that this subscription was registered as if applicable

setObjectName

public void setObjectName(ObjectName objectName)

Description copied from interface: Subscription

Set when the subscription is registered in JMX

Specified by:

setObjectName in interface Subscription

getPrefetchSize

public int getPrefetchSize()

Specified by:

getPrefetchSize in interface Subscription

Returns:

the prefetch size that is configured for the subscription

isUsePrefetchExtension

public boolean isUsePrefetchExtension()

setUsePrefetchExtension

public void setUsePrefetchExtension(boolean usePrefetchExtension)

setPrefetchSize

public void setPrefetchSize(int newSize)

isRecoveryRequired

public boolean isRecoveryRequired()

Description copied from interface: Subscription

Informs the Broker if the subscription needs to intervention to recover it's state e.g. DurableTopicSubscriber may do

Specified by:

isRecoveryRequired in interface Subscription

Returns:

true if recovery required

See Also:

PendingMessageCursor

isSlowConsumer

public boolean isSlowConsumer()

Specified by:

isSlowConsumer in interface Subscription

setSlowConsumer

public void setSlowConsumer(boolean val)

addRecoveredMessage

public boolean addRecoveredMessage(ConnectionContext context,
                                   org.apache.activemq.broker.region.MessageReference message)
                            throws Exception

Description copied from interface: SubscriptionRecovery

Add a message to the SubscriptionRecovery

Specified by:

addRecoveredMessage in interface SubscriptionRecovery

Returns:

true if the message is accepted

Throws:

Exception

getActiveMQDestination

public org.apache.activemq.command.ActiveMQDestination getActiveMQDestination()

Specified by:

getActiveMQDestination in interface SubscriptionRecovery

Returns:

the Destination associated with this Subscription

isBrowser

public boolean isBrowser()

Specified by:

isBrowser in interface Subscription

Returns:

true if a browser

getInFlightMessageSize

public long getInFlightMessageSize()

Specified by:

getInFlightMessageSize in interface Subscription

Returns:

the size in bytes of the messages awaiting acknowledgement

getInFlightUsage

public int getInFlightUsage()

Specified by:

getInFlightUsage in interface Subscription

Returns:

the in flight messages as a percentage of the prefetch size

addDestination

public void addDestination(Destination destination)

Add a destination

Parameters:

destination -

removeDestination

public void removeDestination(Destination destination)

Remove a destination

Parameters:

destination -

getCursorMemoryHighWaterMark

public int getCursorMemoryHighWaterMark()

Specified by:

getCursorMemoryHighWaterMark in interface Subscription

setCursorMemoryHighWaterMark

public void setCursorMemoryHighWaterMark(int cursorMemoryHighWaterMark)

Specified by:

setCursorMemoryHighWaterMark in interface Subscription

countBeforeFull

public int countBeforeFull()

Specified by:

countBeforeFull in interface Subscription

Returns:

the number of messages this subscription can accept before its full

unmatched

public void unmatched(org.apache.activemq.broker.region.MessageReference node)
               throws IOException

Specified by:

unmatched in interface Subscription

Throws:

IOException

doAddRecoveredMessage

protected void doAddRecoveredMessage(org.apache.activemq.broker.region.MessageReference message)
                              throws Exception

Throws:

Exception

getTimeOfLastMessageAck

public long getTimeOfLastMessageAck()

Description copied from interface: Subscription

Returns the time since the last Ack message was received by this subscription. If there has never been an ack this value should be set to the creation time of the subscription.

Specified by:

getTimeOfLastMessageAck in interface Subscription

Returns:

time of last received Ack message or Subscription create time if no Acks.

setTimeOfLastMessageAck

public void setTimeOfLastMessageAck(long value)

getConsumedCount

public long getConsumedCount()

Specified by:

getConsumedCount in interface Subscription

incrementConsumedCount

public void incrementConsumedCount()

Specified by:

incrementConsumedCount in interface Subscription

resetConsumedCount

public void resetConsumedCount()

Specified by:

resetConsumedCount in interface Subscription

getSubscriptionStatistics

public SubscriptionStatistics getSubscriptionStatistics()

Specified by:

getSubscriptionStatistics in interface Subscription

wakeupDestinationsForDispatch

public void wakeupDestinationsForDispatch()

getPrefetchExtension

public AtomicInteger getPrefetchExtension()

contractPrefetchExtension

protected void contractPrefetchExtension(int amount)

expandPrefetchExtension

protected void expandPrefetchExtension(int amount)

decrementPrefetchExtension

protected void decrementPrefetchExtension(int amount)

getDestinations

public CopyOnWriteArrayList<Destination> getDestinations()