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INT-657 Added 'discardChannel' for MessageFilter

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This commit is contained in:
Mark Fisher
2009-05-21 14:12:11 +00:00
parent 399eee83b1
commit bc8e58b024
2 changed files with 86 additions and 3 deletions
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36
org.springframework.integration/src/main/java/org/springframework/integration/filter/MessageFilter.java
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@@ -17,8 +17,10 @@
package org.springframework.integration.filter;
import org.springframework.integration.core.Message;
import org.springframework.integration.core.MessageChannel;
import org.springframework.integration.handler.AbstractReplyProducingMessageHandler;
import org.springframework.integration.handler.ReplyMessageHolder;
import org.springframework.integration.message.MessageDeliveryException;
import org.springframework.integration.message.MessageRejectedException;
import org.springframework.integration.selector.MessageSelector;
import org.springframework.util.Assert;
@@ -39,6 +41,8 @@ public class MessageFilter extends AbstractReplyProducingMessageHandler {
private volatile boolean throwExceptionOnRejection;
private volatile MessageChannel discardChannel;
/**
* Create a MessageFilter that will delegate to the given
@@ -54,19 +58,45 @@ public class MessageFilter extends AbstractReplyProducingMessageHandler {
* Specify whether this filter should throw a
* {@link MessageRejectedException} when its selector does not accept a
* Message. The default value is <code>false</code> meaning that rejected
* Messages will be quietly dropped.
* Messages will be quietly dropped or sent to the discard channel if
* available. Typically this value would not be <code>true</code> when
* a discard channel is provided, but if so, it will still apply
* (in such a case, the Message will be sent to the discard channel,
* and <emphasis>then</emphasis> the exception will be thrown).
* @see #setDiscardChannel(MessageChannel)
*/
public void setThrowExceptionOnRejection(boolean throwExceptionOnRejection) {
this.throwExceptionOnRejection = throwExceptionOnRejection;
}
/**
* Specify a channel where rejected Messages should be sent. If the discard
* channel is null (the default), rejected Messages will be dropped. However,
* the 'throwExceptionOnRejection' flag determines whether rejected Messages
* trigger an exception. That value is evaluated regardless of the presence
* of a discard channel.
* @see #setThrowExceptionOnRejection(boolean)
*/
public void setDiscardChannel(MessageChannel discardChannel) {
this.discardChannel = discardChannel;
}
@Override
protected void handleRequestMessage(Message<?> message, ReplyMessageHolder replyHolder) {
if (this.selector.accept(message)) {
replyHolder.set(message);
}
else if (this.throwExceptionOnRejection) {
throw new MessageRejectedException(message);
else {
if (this.discardChannel != null) {
boolean discarded = this.sendReplyMessage(message, this.discardChannel);
if (!discarded) {
throw new MessageDeliveryException(message,
"failed to send rejected Message to the discard channel");
}
}
if (this.throwExceptionOnRejection) {
throw new MessageRejectedException(message);
}
}
}