org.springframework.integration.channel
Class PriorityChannel

java.lang.Object
  org.springframework.integration.channel.AbstractMessageChannel
      org.springframework.integration.channel.AbstractPollableChannel
          org.springframework.integration.channel.QueueChannel
              org.springframework.integration.channel.PriorityChannel

All Implemented Interfaces:

org.springframework.beans.factory.BeanFactoryAware, org.springframework.beans.factory.BeanNameAware, PollableChannel, MessageChannel

public class PriorityChannel
extends QueueChannel

A message channel that prioritizes messages based on a Comparator. The default comparator is based upon the message header's 'priority'.

Author:

Mark Fisher

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.integration.channel.AbstractMessageChannel

AbstractMessageChannel.ChannelInterceptorList

Constructor Summary

PriorityChannel()
Create a channel with an unbounded queue.

PriorityChannel(java.util.Comparator<Message<?>> comparator)
Create a channel with an unbounded queue.

PriorityChannel(int capacity)
Create a channel with the specified queue capacity.

PriorityChannel(int capacity, java.util.Comparator<Message<?>> comparator)
Create a channel with the specified queue capacity.

Method Summary

protected Message<?>	doReceive(long timeout) Subclasses must implement this method.
protected boolean	doSend(Message<?> message, long timeout) Subclasses must implement this method.

Methods inherited from class org.springframework.integration.channel.QueueChannel

clear, getMesssageCount, getRemainingCapacity, purge

Methods inherited from class org.springframework.integration.channel.AbstractPollableChannel

receive, receive

Methods inherited from class org.springframework.integration.channel.AbstractMessageChannel

addInterceptor, getInterceptors, getName, send, send, setBeanFactory, setBeanName, setConversionService, setDatatypes, setInterceptors, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.integration.core.MessageChannel

getName, send, send

Constructor Detail

PriorityChannel

public PriorityChannel(int capacity,
                       java.util.Comparator<Message<?>> comparator)

Create a channel with the specified queue capacity. If the capacity is a non-positive value, the queue will be unbounded. Message priority will be determined by the provided Comparator. If the comparator is null, the priority will be based upon the value of MessageHeader#getPriority().

PriorityChannel

public PriorityChannel(int capacity)

Create a channel with the specified queue capacity. Message priority will be based upon the value of MessageHeader#getPriority().

PriorityChannel

public PriorityChannel(java.util.Comparator<Message<?>> comparator)

Create a channel with an unbounded queue. Message priority will be determined by the provided Comparator. If the comparator is null, the priority will be based upon the value of MessageHeader#getPriority().

PriorityChannel

public PriorityChannel()

Create a channel with an unbounded queue. Message priority will be based on the value of MessageHeader#getPriority().

Method Detail

doSend

protected boolean doSend(Message<?> message,
                         long timeout)

Description copied from class: AbstractMessageChannel

Subclasses must implement this method. A non-negative timeout indicates how long to wait if the channel is at capacity (if the value is 0, it must return immediately with or without success). A negative timeout value indicates that the method should block until either the message is accepted or the blocking thread is interrupted.

Overrides:

doSend in class QueueChannel

doReceive

protected Message<?> doReceive(long timeout)

Description copied from class: AbstractPollableChannel

Subclasses must implement this method. A non-negative timeout indicates how long to wait if the channel is empty (if the value is 0, it must return immediately with or without success). A negative timeout value indicates that the method should block until either a message is available or the blocking thread is interrupted.

Overrides:

doReceive in class QueueChannel