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INT-2031, INT-2112 Added support to fall back on FIFO semantics to the PriorityChannel if PRIORITY header is not provided, changed type of PRIORITY header to be Long instead of Integer

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INT-2031, INT-2112 fixed one more broken test

INT-2031 changed the priority type back to Integer

INT-2031 added SequenceFallbackComparator

INT-2031 changed the name of the comparator from delegatingComparator to targetComparator
This commit is contained in:
Oleg Zhurakousky
2011-09-07 14:33:49 -04:00
committed by Mark Fisher
parent 90061778a4
commit 2930ad0065
3 changed files with 150 additions and 16 deletions
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63
spring-integration-core/src/main/java/org/springframework/integration/channel/PriorityChannel.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2010 the original author or authors.
* Copyright 2002-2011 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -17,8 +17,11 @@
package org.springframework.integration.channel;
import java.util.Comparator;
import java.util.Map;
import java.util.concurrent.PriorityBlockingQueue;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.beans.DirectFieldAccessor;
import org.springframework.integration.Message;
import org.springframework.integration.MessageHeaders;
import org.springframework.integration.util.UpperBound;
@@ -28,10 +31,15 @@ import org.springframework.integration.util.UpperBound;
* The default comparator is based upon the message header's 'priority'.
*
* @author Mark Fisher
* @author Oleg Zhurakousky
*/
public class PriorityChannel extends QueueChannel {
private final UpperBound upperBound;
private final AtomicLong sequenceCounter = new AtomicLong();
private static final String SEQUENCE_HEADER_NAME = "__priorityChannelSequence__";
/**
@@ -42,8 +50,7 @@ public class PriorityChannel extends QueueChannel {
* {@link MessageHeaders#getPriority()}.
*/
public PriorityChannel(int capacity, Comparator<Message<?>> comparator) {
super(new PriorityBlockingQueue<Message<?>>(11,
(comparator != null) ? comparator : new MessagePriorityComparator()));
super(new PriorityBlockingQueue<Message<?>>(11, new SequenceFallbackComparator(comparator)));
this.upperBound = new UpperBound(capacity);
}
@@ -74,32 +81,58 @@ public class PriorityChannel extends QueueChannel {
}
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
protected boolean doSend(Message<?> message, long timeout) {
if (!upperBound.tryAcquire(timeout)) {
return false;
}
Map innerMap = (Map) new DirectFieldAccessor(message.getHeaders()).getPropertyValue("headers");
innerMap.put(SEQUENCE_HEADER_NAME, sequenceCounter.incrementAndGet());
return super.doSend(message, 0);
}
@SuppressWarnings({ "rawtypes"})
@Override
protected Message<?> doReceive(long timeout) {
Message<?> message = super.doReceive(timeout);
if (message != null) {
upperBound.release();
return message;
}
return null;
}
private static class MessagePriorityComparator implements Comparator<Message<?>> {
if (message != null) {
Map innerMap = (Map) new DirectFieldAccessor(message.getHeaders()).getPropertyValue("headers");
innerMap.remove(SEQUENCE_HEADER_NAME);
upperBound.release();
}
return message;
}
private static class SequenceFallbackComparator implements Comparator<Message<?>> {
private final Comparator<Message<?>> targetComparator;
public SequenceFallbackComparator(Comparator<Message<?>> targetComparator){
this.targetComparator = targetComparator;
}
public int compare(Message<?> message1, Message<?> message2) {
Integer priority1 = message1.getHeaders().getPriority();
Integer priority2 = message2.getHeaders().getPriority();
priority1 = priority1 != null ? priority1 : 0;
priority2 = priority2 != null ? priority2 : 0;
return priority2.compareTo(priority1);
int compareResult = 0;
if (this.targetComparator != null){
compareResult = this.targetComparator.compare(message1, message2);
}
else {
Integer priority1 = message1.getHeaders().getPriority();
Integer priority2 = message2.getHeaders().getPriority();
priority1 = priority1 != null ? priority1 : 0;
priority2 = priority2 != null ? priority2 : 0;
compareResult = priority2.compareTo(priority1);
}
if (compareResult == 0){
Long sequence1 = (Long) message1.getHeaders().get(SEQUENCE_HEADER_NAME);
Long sequence2 = (Long) message2.getHeaders().get(SEQUENCE_HEADER_NAME);
compareResult = sequence1.compareTo(sequence2);
}
return compareResult;
}
}

3
spring-integration-core/src/main/java/org/springframework/integration/config/xml/StandardHeaderEnricherParser.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2010 the original author or authors.
* Copyright 2002-2011 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -31,6 +31,7 @@ import org.springframework.util.StringUtils;
* references) if provided as 'header' sub-elements.
*
* @author Mark Fisher
* @author Oleg Zhurakousky
*/
public class StandardHeaderEnricherParser extends HeaderEnricherParserSupport {