wso2 - using value from a property to retrive sequence name - wso2

Question

I'm configuring a proxy-service and I have three sequences: s1,s2,s3
The value of 1,2,3 is stored in a local registry variable and it's get from the registry and stored in the property called 'myProp'
now, based on the value of this myProp I would like to call one of the three sequences.
I tried this:
<sequence key="s{concat(get-property('myProp'))}"/>
but doesn't works.
This is the property code:
<property name="myProp"
expression="get-property('registry','conf:repository/myVersion2.xml')"
scope="default"
type="STRING"/>
and this is what I'm trying to do:
<filter source="get-property('myProp')"
regex=".*>1<.*"
description="filter">
<then>
<log level="custom" separator=":">
<property name="TestVersion" value="LOG_S1_TRUE"/>
<property name="TestVersion" expression="get-property('myProp')"/>
</log>
<sequence key="s{concat(get-property('myProp'))}"/>
</then>
<else>
<log level="custom" separator=":">
<property name="TestVersion" value="LOG_S1_FALSE"/>
</log>
</else>
</filter>
I get this error from the log:
TID: [0] [ESB] [2015-07-03 12:47:25,340] ERROR {org.apache.synapse.mediators.base.SequenceMediator} - Sequence named Value {name ='null', keyValue ='s{concat(get-property('myProp'))}'} cannot be found {org.apache.synapse.mediators.base.SequenceMediator}
Thanks in advance to who know how to solve it.
Regards
Claudio

Answer 1

Assign the keyvalue to a property first to test it, you will notice that it cannot work :)
Try:
<sequence key="{concat('s', get-property('myProp'))}"/>