Class UniquePropertyMessageEvictionStrategy

java.lang.Object

org.apache.activemq.broker.region.policy.MessageEvictionStrategySupport

org.apache.activemq.broker.region.policy.UniquePropertyMessageEvictionStrategy

All Implemented Interfaces:

MessageEvictionStrategy

public class UniquePropertyMessageEvictionStrategy
extends MessageEvictionStrategySupport

An eviction strategy which evicts the oldest message within messages with the same property value

Field Summary

Fields

Modifier and Type	Field	Description
protected String	propertyName

Constructor Summary

Constructors

Constructor	Description
UniquePropertyMessageEvictionStrategy()

Method Summary

Modifier and Type	Method	Description
org.apache.activemq.broker.region.MessageReference[]	evictMessages(LinkedList messages)	Find the message reference in the given list with oldest messages at the front and newer messages at the end
String	getPropertyName()
void	setPropertyName(String propertyName)

Methods inherited from class MessageEvictionStrategySupport

getEvictExpiredMessagesHighWatermark, isExpiryCheckEnabled, setEvictExpiredMessagesHighWatermark, setExpiryCheckEnabled

Methods inherited from class Object

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

Field Details

propertyName

protected String propertyName

Constructor Details

UniquePropertyMessageEvictionStrategy

public UniquePropertyMessageEvictionStrategy()

Method Details

getPropertyName

public String getPropertyName()

setPropertyName

public void setPropertyName(String propertyName)

evictMessages

public org.apache.activemq.broker.region.MessageReference[] evictMessages(LinkedList messages)
                                                                   throws IOException

Description copied from interface: MessageEvictionStrategy

Find the message reference in the given list with oldest messages at the front and newer messages at the end

Returns:

the message that has been evicted.

Throws:

IOException - if an exception occurs such as reading a message content (but should not ever happen as usually all the messages will be in RAM when this method is called).