what different between message-driven-channel-adapter and jms:inbound-gateway

[loveam]

hi,all:

after read SI reference, I am confuse about it.

according the document, it looks "jms:message-driven-channel-adapter" and "jms:inbound-gateway" doing a same thing.

[Mark Fisher]

The difference is that any "-channel-adapter" in Spring Integration is *one way* while any "gateway" adapter supports *request/reply*. So, for example, when using the JMS "inbound-gateway", any JMS client can send a Message that has a JMSReplyTo property and expect a response on the Destination as long as the Spring Integration Message flow that begins with that adapter does in fact generate a response.

[loveam]

thank you very much

[Grzegorz Grzybek]

Hi

And in code it looks like this:


this.registerBeanDefinitionParser("inbound-gateway", new JmsMessageDrivenEndpointParser(true));
this.registerBeanDefinitionParser("message-driven-channel-adapter", new JmsMessageDrivenEndpointParser(false));


The boolean flag is used to set expectReply property.
When the listener receives incoming JMS message, "inbound-gateway" sends it to the channel ("pulls" it into Spring-Integration) using:


this.channelTemplate.send(requestMessage)

"message-driven-channel-adapter" uses:


this.channelTemplate.sendAndReceive(requestMessage )

which may block when you are not going to reply to JMS message (which is common in case JMS is used as some kind of notification service).

regards
Grzegorz Grzybek