org.springframework.integration.dispatcher
Class DirectChannel

java.lang.Object
  org.springframework.integration.channel.AbstractMessageChannel
      org.springframework.integration.dispatcher.DirectChannel

All Implemented Interfaces:

org.springframework.beans.factory.BeanNameAware, MessageChannel, BlockingSource, BlockingTarget, MessageSource, MessageTarget, Subscribable

public class DirectChannel
extends AbstractMessageChannel
implements Subscribable

A channel that invokes the subscribed handler(s) in a sender's thread (returning after at most one handles the message). If a MessageSource is provided, then that source will likewise be polled within a receiver's thread.

Author:

Dave Syer, Mark Fisher

Field Summary

private SimpleDispatcher	dispatcher
private java.util.concurrent.atomic.AtomicInteger	handlerCount
private MessageSource<?>	source

Constructor Summary

DirectChannel()

DirectChannel(MessageSource<?> source)

Method Summary

java.util.List<Message<?>>	clear() Remove all Messages from this channel.
protected Message<?>	doReceive(long timeout) Subclasses must implement this method.
protected boolean	doSend(Message<?> message, long timeout) Subclasses must implement this method.
java.util.List<Message<?>>	purge(MessageSelector selector) Remove any Messages that are not accepted by the provided selector.
boolean	subscribe(MessageTarget target) Register a MessageTarget as a subscriber to this source.
boolean	unsubscribe(MessageTarget target) Remove a MessageTarget from the subscribers of this source.

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

addInterceptor, getName, receive, receive, send, send, setBeanName, setInterceptors, setName, toString

Methods inherited from class java.lang.Object

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

Field Detail

source

private volatile MessageSource<?> source

dispatcher

private final SimpleDispatcher dispatcher

handlerCount

private final java.util.concurrent.atomic.AtomicInteger handlerCount

Constructor Detail

DirectChannel

public DirectChannel()

DirectChannel

public DirectChannel(MessageSource<?> source)

Method Detail

subscribe

public boolean subscribe(MessageTarget target)

Description copied from interface: Subscribable

Register a MessageTarget as a subscriber to this source.

Specified by:

subscribe in interface Subscribable

unsubscribe

public boolean unsubscribe(MessageTarget target)

Description copied from interface: Subscribable

Remove a MessageTarget from the subscribers of this source.

Specified by:

unsubscribe in interface Subscribable

doReceive

protected Message<?> doReceive(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 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.

Specified by:

doReceive in class AbstractMessageChannel

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.

Specified by:

doSend in class AbstractMessageChannel

clear

public java.util.List<Message<?>> clear()

Description copied from interface: MessageChannel

Remove all Messages from this channel.

Specified by:

clear in interface MessageChannel

purge

public java.util.List<Message<?>> purge(MessageSelector selector)

Description copied from interface: MessageChannel

Remove any Messages that are not accepted by the provided selector.

Specified by:

purge in interface MessageChannel