December 2008 - jboss-dev-forums - Jboss List Archives

[Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBM 2.0 Strict ordering via ordering groups

by ataylor

anonymous wrote : What's the advantage in allowing multiple consumers? If you're ordering, then by definition, you will need to serialise consumption I was just taking this from the comments on the Jira, 'In order to guarantee strict ordering, even on rollback or in the presence of multiple consumers or with xa transactions, the queue needs to ensure that no more than one message with the value of ordering group is being delivered at any one time.' anonymous wrote : I'm not sure I understand that, can you elaborate? So you send 10 messages, 5 for group A, with seq 1 to 5, and 5 for group B again with seq 1 to 5. A consumer consumes message group A seq 1 but does not acknowledge, the next message in group A with seq 2 can't be delivered but message group B seq 1 can, This gives you strict ordering within the defined group. anonymous wrote : Why would message groups deliver messages out of order? I don't follow that either. The producer can specify on send the sequence number of a message to specify its delivery order. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193863#4193863 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193863

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[Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBM 2.0 Strict ordering via ordering groups

by timfox

"ataylor" wrote : | yes it does, but isn't this done differently. You could have multiple consumers for a start, | What's the advantage in allowing multiple consumers? If you're ordering, then by definition, you will need to serialise consumption anonymous wrote : Also lets say you have 2 groups of messages odd and even, say m1 to m10, you should be able to deliver m2 even if m1 hasn't been delivered yet. | I'm not sure I understand that, can you elaborate? anonymous wrote : | Another thing is that you should always deliver in sequence, so if you send 3 messages with sequence 1, 3 then 2, the queue shouldn't deliver the message with sequence 3 before it delivers sequence no 2. Why would message groups deliver messages out of order? I don't follow that either. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193842#4193842 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193842

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[Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBM 2.0 Strict ordering via ordering groups

by ataylor

anonymous wrote : Yes, doesn't that give you ordering? yes it does, but isn't this done differently. You could have multiple consumers for a start, which is why you don't release the next message in the group until the previous has been acked. Also lets say you have 2 groups of messages odd and even, say m1 to m10, you should be able to deliver m2 even if m1 hasn't been delivered yet. Another thing is that you should always deliver in sequence, so if you send 3 messages with sequence 1, 3 then 2, the queue shouldn't deliver the message with sequence 3 before it delivers sequence no 2. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193841#4193841 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193841

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[Design the new POJO MicroContainer] - Re: KernelDeploymentDeployer and annotations in MDR

by scott.stark＠jboss.org

The current issue is that I do not see a deployment level annotation such as the following: | <deployment xmlns="urn:jboss:bean-deployer:2.0"> | | <annotation>@org.jboss.managed.api.annotation.ManagementDeployment(description="JBossSX Security Beans")</annotation> | ... | when creating the MangedObject for the KernelDeployment attachment in the KernelDeployment's DeplomentUnit MetaData. This annotation should not be pushed down to the component BeanMetaData. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193836#4193836 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193836

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[Design the new POJO MicroContainer] - Re: KernelDeploymentDeployer and annotations in MDR

by adrian＠jboss.org

But wouldn't it make more sense if the deployment annotations went into the DEPLOYMENT scope rather than the INSTANCE scope? i.e. there is no merge, just the normal overrides by scope This would also some other deployer to modify them. I didn't remember adding annotations to kernel deployments :-) so I went back to the original change http://viewvc.jboss.org/cgi-bin/viewvc.cgi/jbossas?view=rev&revision=60491 and from the date of that located the forum thread http://www.jboss.com/index.html?module=bb&op=viewtopic&t=100349 The issue appears to be that for the plain deployment, we don't necessarily have the classloader from which we can create the annotations. e.g. | <deployment> | <classloader><inject name="BeanConstructedLaterOrInThisFile"></classloader> | <annotation>@from.that.Classloader</annotation> | </deployment> | This could in principle also apply to the VDF, but more often than not we can use the DeploymentUnit's classloader. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193834#4193834 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193834

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[Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBM 2.0 Strict ordering via ordering groups

by timfox

"ataylor" wrote : GroupingRoundRobinDistributionPolicy pins a consumer to a message group, so if a queue has multiple consumers, messages with a certain group id set will always be distributed to the same consumer. Yes, doesn't that give you ordering? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193829#4193829 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193829

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[Design the new POJO MicroContainer] - Re: KernelDeploymentDeployer and annotations in MDR

by alesj

The annotations merge is done here: - http://anonsvn.jboss.org/repos/jbossas/projects/microcontainer/trunk/kern... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193819#4193819 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193819

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[Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBM 2.0 Strict ordering via ordering groups

by ataylor

GroupingRoundRobinDistributionPolicy pins a consumer to a message group, so if a queue has multiple consumers, messages with a certain group id set will always be distributed to the same consumer. An ordering group, as far as i understood, was to do with the order of messages within a group. So you could send 2 sets of messages for 2 different groups and the messages would be delivered in order within their own group. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193818#4193818 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193818

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[Design of JBoss jBPM] - Re: Using TaskManagement for non node specific TaskInstances

by aapthorp

Thanks, will look out for the alpha... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193817#4193817 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193817

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[Design the new POJO MicroContainer] - KernelDeploymentDeployer and annotations in MDR

by scott.stark＠jboss.org

Shouldn't the KernelDeploymentDeployer be loading the KernelDeployment annotations into the deployment MetaData? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4193816#4193816 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4193816

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jboss-dev-forums December 2008