how to compare integer properties in filter mediation in wso2 esb?

问题

i am new in wso2 esb and define 3 service that return integer value and use filter mediator to rout from one to another , but not correct work and in filter mode always return false my source is :

<sequence xmlns="http://ws.apache.org/ns/synapse" name="SeqOne">
<log level="full"/>
<property xmlns:ns="http://org.apache.synapse/xsd" xmlns:m0="http://tempuri.org/"        name="CParam" expression="//m0:SumSerViseResponse/m0:SumSerViseResult" scope="default"   type="INTEGER"/>
<log level="custom">
  <property xmlns:ns="http://org.apache.synapse/xsd" name="CParam"  expression="$ctx:CParam"/>
</log>
<property name="propertyA" value="4" scope="default" type="INTEGER"/>
<log level="custom">
  <property xmlns:ns="http://org.apache.synapse/xsd" name="propertyA" expression="get-property('propertyA')"/>
</log>
<property xmlns:ns="http://org.apache.synapse/xsd" name="propertyCompare" expression="$ctx:CParam > get-property('propertyA')" type="STRING"/>
<log level="custom">
  <property xmlns:ns="http://org.apache.synapse/xsd" name="propertyCompare" expression="get-property('propertyCompare')"/>
</log>
<filter xmlns:ns="http://org.apache.synapse/xsd" source="get-property('propertyCompare')" regex="true">
  <then>

回答1:

I tried your scenario and got the same output as yours. Then looked deep into it as this was a basic functionality and as I thought I've done something similar before.

The issue here is in the type of the property. For some strange reason INTEGER does not work here. You need to have DOUBLE or STRING. Even if you have string, it will correctly cast it when you do a comparison as in here. The following worked for me.

<inSequence>
     <log level="full"/>
     <property xmlns:m0="http://tempuri.org/"
               name="CParam"
               expression="//m0:SumSerViseResponse/m0:SumSerViseResult"
               scope="default"
               type="DOUBLE"/>
     <log level="custom">
        <property name="CParam" expression="$ctx:CParam"/>
     </log>
     <property name="propertyA" value="4.0" scope="default" type="DOUBLE"/>
     <log level="custom">
        <property xmlns:ns="http://org.apache.synapse/xsd"
                  name="propertyA"
                  expression="get-property('propertyA')"/>
     </log>
     <property name="propertyCompare"
               expression="$ctx:CParam > get-property('propertyA')"
               scope="default"
               type="BOOLEAN"/>
     <log level="custom">
        <property name="propertyCompare" expression="get-property('propertyCompare')"/>
     </log>
     <filter xpath="$ctx:CParam > get-property('propertyA')">
        <then>
           <send>
              <endpoint>
                 <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
              </endpoint>
           </send>
        </then>
        <else>
           <drop/>
        </else>
     </filter>
  </inSequence>

回答2:

following is an example done with switch mediator,

<switch source="get-property('propertyCompare')">
        <case regex="1">
           <log>
              <property name="one" value="__________ONE__________"/>
           </log>
        </case>
        <case regex="2">
           <log>
              <property name="two" value="__________TWO__________"/>
           </log>
        </case>
     </switch>

replace the log mediators with send mediator according to your needs.

来源：https://stackoverflow.com/questions/18866765/how-to-compare-integer-properties-in-filter-mediation-in-wso2-esb

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filter

wso2

esb

mediator