UniquePropertyMessageEvictionStrategy (ActiveMQ 5.17.0 API)

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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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 org.apache.activemq.broker.region.policy.MessageEvictionStrategySupport
getEvictExpiredMessagesHighWatermark, setEvictExpiredMessagesHighWatermark

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - propertyName
```
protected String propertyName
```
- Constructor Detail
  - UniquePropertyMessageEvictionStrategy
```
public UniquePropertyMessageEvictionStrategy()
```
- Method Detail
  - getPropertyName
```
public String getPropertyName()
```
  - setPropertyName
```
public void setPropertyName(String propertyName)
```
  - evictMessages
```
public 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).