Apache
/
activemq
mirror of https://github.com/apache/activemq.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

it's ensure dispatching happens in order 

git-svn-id: https://svn.apache.org/repos/asf/incubator/activemq/trunk@490111 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Robert Davies 2006-12-25 07:19:29 +00:00
parent d8674a0fed
commit c651ace525
1 changed files with 28 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
activemq-core/src/main/java/org/apache/activemq/broker/region/PrefetchSubscription.java
View File

@ -22,6 +22,7 @@ import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSException;
import org.apache.activemq.broker.Broker;
@ -60,6 +61,7 @@ abstract public class PrefetchSubscription extends AbstractSubscription{
protected long enqueueCounter;
protected long dispatchCounter;
protected long dequeueCounter;
private AtomicBoolean dispatching = new AtomicBoolean();
public PrefetchSubscription(Broker broker,ConnectionContext context,ConsumerInfo info, PendingMessageCursor cursor)
throws InvalidSelectorException{
@ -389,31 +391,37 @@ abstract public class PrefetchSubscription extends AbstractSubscription{
protected void dispatchMatched() throws IOException{
List toDispatch=null;
synchronized(pending){
if(dispatching.compareAndSet(false,true)){
try{
pending.reset();
while(pending.hasNext()&&!isFull()){
MessageReference node=pending.next();
pending.remove();
// Message may have been sitting in the pending list a while
// waiting for the consumer to ak the message.
if(node!=QueueMessageReference.NULL_MESSAGE&&node.isExpired()){
continue; // just drop it.
List toDispatch=null;
synchronized(pending){
try{
pending.reset();
while(pending.hasNext()&&!isFull()){
MessageReference node=pending.next();
pending.remove();
// Message may have been sitting in the pending list a while
// waiting for the consumer to ak the message.
if(node!=QueueMessageReference.NULL_MESSAGE&&node.isExpired()){
continue; // just drop it.
}
if(toDispatch==null){
toDispatch=new ArrayList();
}
toDispatch.add(node);
}
}finally{
pending.release();
}
if(toDispatch==null){
toDispatch=new ArrayList();
}
if(toDispatch!=null){
for(int i=0;i<toDispatch.size();i++){
MessageReference node=(MessageReference)toDispatch.get(i);
dispatch(node);
}
toDispatch.add(node);
}
}finally{
pending.release();
}
}
if(toDispatch!=null){
for(int i=0;i<toDispatch.size();i++){
MessageReference node=(MessageReference)toDispatch.get(i);
dispatch(node);
dispatching.set(false);
}
}
}