[英]In Spring integration, how do I use Util constant in router channel
I've a use case where I've defined all my constants in one class.我有一个用例,我在一个类中定义了所有常量。
public class MyExampleConstants {
public static String FOO1 = "hulcSmash";
public static String FOO2 = "billionairePlayBoy";
public static String FOO3 = "capShield";
}
Right now I'm using something like this in routerChan for mapping values:现在我在 routerChan 中使用类似的东西来映射值:
//using exact string match in mapping value, however, want to see if the constants be used here.
<int:router input-channel="powRouterChan" resolution-required="false" expression="payload.avengersVO.powType" default-output-channel="flowEndPoint">
<int:mapping value="hulcSmash" channel="avengersHulcChan" />
<int:mapping value="billionairePlayBoy" channel="avengersIRManChan" />
<int:mapping value="capShield" channel="avengersCapAmericaChan" />
</int:router>
and In router expresstions something like this:在路由器表达式中是这样的:
//Now these placeholders are being configured in properties
<int:router input-channel="channelABC" expression=" !payload.avengersVO.powType.equals('${avengers.hulc.smash}')
and !payload.avengersVO.powType.equals('${avengers.billionaire.PlayBoy}')
and !payload.avengersVO.powType.equals('${avengers.capShield}') ? 'flowEndpoint' : 'civilWarsChan'"/>
Now I've added my constants into my context and want to use them in my router channel as mapping values:现在我已将常量添加到我的上下文中,并希望在我的路由器通道中将它们用作映射值:
<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"/>
<int:router input-channel="powRouterChan" resolution-required="false" expression="payload.avengersVO.powType" default-output-channel="flowEndPoint">
<int:mapping value="foo1" channel="avengersHulcChan" />
<int:mapping value="foo2" channel="avengersIRManChan" />
<int:mapping value="foo3" channel="avengersCapAmericaChan" />
</int:router>
and want to update the expression above to something like this, using constants that I've declared above:并希望使用我在上面声明的常量将上面的表达式更新为类似的内容:
<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'"/>
Please suggust how can I use this.请建议我如何使用它。 Thanks in advance.
提前致谢。
You can do it directly in the original mapping router, using the T
operator:您可以使用
T
运算符直接在原始映射路由器中执行此操作:
<int:router input-channel="powRouterChan" resolution-required="false" expression="payload.avengersVO.powType" default-output-channel="flowEndPoint">
<int:mapping value="#{T(com.marvel.avengers.hulc.util.MyExampleConstants).FOO1}" channel="avengersHulcChan" />
...
</int:router>
or using the static:或使用静态:
<int:router input-channel="powRouterChan" resolution-required="false" expression="payload.avengersVO.powType" default-output-channel="flowEndPoint">
<int:mapping value="#{foo1}" channel="avengersHulcChan" />
...
</int:router>
If you must do it in the expression for some reason, use @foo1
where the @
means reference to a bean.如果出于某种原因必须在表达式中执行此操作,请使用
@foo1
,其中@
表示对 bean 的引用。 But the first two solutions are more efficient.但前两种解决方案更有效。
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