selector-expression from custom method

[keerthib]

Hi,

I am using recipient list router to route messages to different channels like below:
I want to inject selector_expression value from another bean (selectorExpressionEvaluator). How can I do that?

Here is my SI:

                       'recipient-list-router'(
				'input-channel':'inputChannel'
				)
			{
				recipient (
					'channel':'channelToTransformer',
					'selector-expression':"if(0==0)"
					)
				recipient (
					'channel':'mailChannel',
					'selector-expression':""
					)
			}

Bean:

class selectorExpressionEvaluator{
 
boolean validateMessage(Message message){
// code which checks header/property values against valid values listed in xml and returns true/false
}
}

If I can call this method, will it be called every time router receives message? or will it be called only once during app start-up?
Idea is - we should be able to change the channel message selector during run time. Any other suggestions?

Please help.
Thank you
Keerthi.

[Mark Fisher]

I don't know if I'm following the use-case exactly, but here are a couple ideas that might help. SpEL expressions can reference a bean via the @ symbol: expression="@foo.bar(payload, headers.x)" - AND you can always use a Router or Filter that has a <groovy:script ../> sub-element. The groovy script can be dynamic (see: http://static.springsource.org/sprin...single/#groovy). We also support something similar for SpEL with the <expression> sub-element (see: http://static.springsource.org/sprin...lter-namespace and scroll down to the example that has an 'expression' sub-element).

Hope that helps.
-Mark

[keerthib]

Hi Mark,

Thank you for that. I am exactly looking for this syntax - @foo.bar() and I just found it in here : https://jira.springsource.org/browse/INT-578
My bean extends MessageSelector, so I am assuming that I don't have to call @myBean.accept(message) and giving this should be enough - expression = "@myBean"
I am trying that anyways.

Thank you.
keerthi

[keerthib]

Hi,

I tried doing this but message is directly going to transformer even though expression is returning false by default! Where am I going wrong?!

outgoingEventFilter(com.event.filter.OutgoingEventFilter)
recipient (
	'channel':'outChannel',
	'selector-expression':"@outgoingEventFilter.accept(payload)"
)

class OutgoingEventFilter implements MessageSelector{	
	@Override
	public boolean accept(Message<Object> message) {
		return false
	}
	public boolean accept(String payload){
		return false
	}	
}

Even if I give direct FALSE, message is going to outChannel?!

def doWithSpring = {
 integration{
  'recipient-list-router'(id:'listenerRouter','input-channel':'inChannel')
  {
   recipient('selector-expression':"false",'channel':'outChannel')
  }
 }
}