如何在路由器表达式中使用util常量？

Question

I've defined these util constants in my context.

<util:constant id="foo1" static-field="com.marvel.avengers.hulc.util.MyExampleConstants.FOO1"/>
<util:constant id="foo2" static-field="com.marvel.avengers.hulc.util.MyExampleConstants.FOO2"/>
<util:constant id="foo3" static-field="com.marvel.avengers.hulc.util.MyExampleConstants.FOO3"/>

I've tried using foo1 constant in my router expression, but it looks like #{foo1} is a bean id and not its value.

<int:router input-channel="channelABC" expression=" !payload.avengersVO.powType.equals(#{foo1}) 
        and !payload.avengersVO.powType.equals(#{foo2}) 
        and !payload.avengersVO.powType.equals(#{foo3}) ? 'flowEndpoint' : 'civilWarsChan'"/>

On the other hand I could use this in an expression but want to see if I could make use of the constants that I've defined in the router expression:

<int:router input-channel="channelABC" expression=" !payload.avengersVO.powType.equals(T(com.marvel.avengers.hulc.util.MyExampleConstants).FOO1) 
    and !payload.avengersVO.powType.equals(T(com.marvel.avengers.hulc.util.MyExampleConstants).FOO2) 
    and !payload.avengersVO.powType.equals(T(com.marvel.avengers.hulc.util.MyExampleConstants).FOO3) ? 'flowEndpoint' : 'civilWarsChan'"/>

Can someone help me to know, how to get value from this bean in router expression. Thanks in advance.

Answer 1

This should work:

!payload.avengersVO.powType.equals(@foo2) 

Although, your case looks for me fine, too:

<util:constant id="foo" static-field="org.springframework.integration.router.config.RouterParserTests.FOO"/>

<router input-channel="constantExpressionRouter" expression="'#{foo}'"/>

However, pay attention that I wrap the Bean Definition expression into the literal quotes to avoid an attempt to evaluate it as a property at runtime on each message.