Package org.apache.activemq.memory.buffer

Class SizeBasedMessageBuffer

java.lang.Object

org.apache.activemq.memory.buffer.SizeBasedMessageBuffer

All Implemented Interfaces:

MessageBuffer

public class SizeBasedMessageBuffer
extends Object
implements MessageBuffer

A MessageBuffer which evicts from the largest buffers first.

Constructor Summary

Constructors

Constructor	Description
SizeBasedMessageBuffer()
SizeBasedMessageBuffer(int limit)

Method Summary

Modifier and Type	Method	Description
protected void	bubbleDown(MessageQueue biggest, int position)
protected void	bubbleUp(MessageQueue queue, int queueSize)
void	clear()
MessageQueue	createMessageQueue()	Creates a new message queue instance
int	getSize()
void	onSizeChanged(MessageQueue queue, int delta, int queueSize)	After a message queue has changed we may need to perform some evictions
protected void	swap(int firstPosition, MessageQueue first, int secondPosition, MessageQueue second)

Methods inherited from class java.lang.Object

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

Constructor Details

SizeBasedMessageBuffer

public SizeBasedMessageBuffer()

SizeBasedMessageBuffer

public SizeBasedMessageBuffer(int limit)

Method Details

getSize

public int getSize()

Specified by:

getSize in interface MessageBuffer

createMessageQueue

public MessageQueue createMessageQueue()

Creates a new message queue instance

Specified by:

createMessageQueue in interface MessageBuffer

onSizeChanged

public void onSizeChanged(MessageQueue queue,
 int delta,
 int queueSize)

After a message queue has changed we may need to perform some evictions

Specified by:

onSizeChanged in interface MessageBuffer

Parameters:

delta -

queueSize -

clear

public void clear()

Specified by:

clear in interface MessageBuffer

bubbleUp

protected void bubbleUp(MessageQueue queue,
 int queueSize)

bubbleDown

protected void bubbleDown(MessageQueue biggest,
 int position)

swap

protected void swap(int firstPosition,
 MessageQueue first,
 int secondPosition,
 MessageQueue second)