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From "james strachan (JIRA)" <j...@activemq.org>
Subject [jira] Commented: (AMQ-641) JMS is a asynchronous interface ,blocking is not allow.
Date Fri, 17 Mar 2006 10:00:26 GMT
    [ http://jira.activemq.org/jira//browse/AMQ-641?page=comments#action_35776 ] 

james strachan commented on AMQ-641:
------------------------------------

This is not strictly true; the JMS API consists of a number of synchronous APIs and some asynchronous
APIs. The asynchronous part is really the consumer.setMessageListener().

In the JMS specification, operations such as createConnnection, createSession, createProducer,
createConsumer, send, commit, rollback are all actually synchronous operations - for good
reason since due to security constraints, they could fail - or for reliability reasons users
need to know a transaction or message send did actually work and make it to the broker.

However ActiveMQ does have an extension where we can configure all send operations to be asynchronous
by default, so once a connection is established, sends will be non-blocking.
e.g. for 3.x use tcp;//localhost:61616?useAsyncSend=true

http://activemq.org/ActiveMQ+3+Transport+Configurations

>  JMS is a asynchronous interface ,blocking is not allow.
> --------------------------------------------------------
>
>          Key: AMQ-641
>          URL: http://jira.activemq.org/jira//browse/AMQ-641
>      Project: ActiveMQ
>         Type: Bug

>   Components: JMS client, Connector
>     Versions: 3.2.2, 4.0 M4
>  Environment: winxp jdk1.4.2 jdk 1.5.6
>     Reporter: tao

>
>
> If I use failover:tcp//.... in the jms client,
> That all method will be blocked when net or activemq error.
> This  is not a good idea.My application will be blocked. 
> And If I use tcp//.... in the jms client,Sometimes ,send(message) method will be blocked,also
not return.
>  JMS is a asynchronous interface ,blocking is not allow at any condition.

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