How to Read file Stored in Registry - WSO2 ESB

Sometimes we need to read file content in the mediation flow of WSO2 ESB.

Let's say we have a file named EndPoints.xml with the below content in the registry path of /_system/config/repository/demo as follows.

File Content :

<EndPointsList xmlns:ns1="http://endpoints">
<EP>www.google.com</EP>
<EP>www.yahoo.com</EP>
</EndPointsList>

Registry Path:

Sample Proxy:

In this proxy service, the file named EndPoints.xml is read and content is printed using log mediator.

<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="TestFileReadProxy"
       transports="https,http"
       statistics="disable"
       trace="disable"
       startOnLoad="true">
   <target>
      <inSequence>
         <property name="EndPointList"
                   expression="get-property('registry','conf:/repository/demo/EndPoints.xml')"
                   scope="default"
                   type="OM"/>
         <foreach xmlns:nm="http://endpoints"
                  id="foreach_1"
                  expression="$ctx:EndPointList//EP">
            <sequence>
               <log level="custom">
                  <property name="EP:" expression="//EP"/>
               </log>
            </sequence>
         </foreach>
         <respond/>
      </inSequence>
   </target>
   <description/>
</proxy>
                                

Log Output:

TID: [-1234] [] [2016-12-02 11:58:13,964]  INFO {org.apache.synapse.mediators.builtin.LogMediator} -  EP: = www.google.com {org.apache.synapse.mediators.builtin.LogMediator}
TID: [-1234] [] [2016-12-02 11:58:13,966]  INFO {org.apache.synapse.mediators.builtin.LogMediator} -  EP: = www.yahoo.com {org.apache.synapse.mediators.builtin.LogMediator}