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Objective: Using the file

Introduction

This sample demonstrates how to use the file system as an input medium using via the inbound file listener.

Prerequisites

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• Create three 3 new directories named in, out and original in a test directory , for example, in, out, original in (e.g., /home/user/test. Open ESB_HOME) in the local file system. Then, open the <ESB_HOME>/repository/samples/synapse_sample_900.xml and edit the following values. Change xml file in a text editor and change the transport.vfs.FileURI, transport.vfs.MoveAfterProcess, transport.vfs.MoveAfterFailure parameter  parameter values to the above the in, original,  and original directories  directory locations respectively. 
• Start the Synapse configuration numbered 900: wso2esb-samples.sh -sn 900
• Copy ESB_HOME/repository/samples/resources/vfs/test.xml to the directory given in transport.vfs.FileURI above.

Building the sample

The XML configuration for this sample is as follows:

<definitions xmlns="http://ws.apache.org/ns/synapse">
   <registry provider="org.wso2.carbon.mediation.registry.WSO2Registry">
      <parameter name="cachableDuration">15000</parameter>
   </registry>
   <taskManager provider="org.wso2.carbon.mediation.ntask.NTaskTaskManager">
      <parameter name="cachableDuration">15000</parameter>
   </taskManager>
   <inboundEndpoint xmlns="http://ws.apache.org/ns/synapse" name="file_inbound" sequence="request" onError="fault"  
                                                                           protocol="file" suspend="false">
      <parameters>
         <parameter name="interval">1000</parameter>
         <parameter name="sequential">true</parameter>
         <parameter name="transport.vfs.FileURI">file:///home/user/test/in</parameter>
         <!--CHANGE-->
         <parameter name="transport.vfs.ContentType">text/xml</parameter>
         <parameter name="transport.vfs.FileNamePattern">.*\.xml</parameter>
         <parameter name="transport.vfs.MoveAfterProcess">file:///home/user/test/original</parameter>
         <!--CHANGE-->
         <parameter name="transport.vfs.MoveAfterFailure">file:///home/user/test/original</parameter>
         <!--CHANGE-->
         <parameter name="transport.vfs.ActionAfterProcess">MOVE</parameter>
         <parameter name="transport.vfs.ActionAfterFailure">MOVE</parameter>
      </parameters>
   </inboundEndpoint>
   <sequence name="request" onError="fault">
      <call>
         <endpoint>
            <address format="soap12" uri="http://localhost:9000/services/SimpleStockQuoteService"/>
         </endpoint>
      </call>
      <drop/>
   </sequence>
</definitions>

...

This configuration file synapse_sample_900.xml is available in the <ESB_HOME>/repository/samples directory.

To build the sample

1. Start the ESB with the sample 900 configuration. For instructions on starting a sample ESB configuration, see Starting the ESB with a sample configuration.
   The operation log keeps running until the server starts, which usually takes several seconds. Wait until the server has fully booted up and displays a message similar to "WSO2 Carbon started in n seconds."

2. Start the Axis2 server. For instructions on starting the Axis2 server, see Starting the Axis2 server.

3. Deploy the back-end service SimpleStockQuoteService. For instructions on deploying sample back-end services, see Deploying sample back-end services.

Executing the sample

To execute the sample client

• Copy the ESB_HOME/repository/samples/resources/vfs/test.xml file to the location specified in transport.vfs.FileURI in the configuration (i.e., the in directory).
  
  The  test.xml file contains a simple stock quote request and is as follows: 

  Code Block
  language html/xml
  <?xml version='1.0' encoding='UTF-8'?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsa="http://www.w3.org/2005/08/addressing"> <soapenv:Body> <m0:getQuote xmlns:m0="http://services.samples"> <m0:request> <m0:symbol>IBM</m0:symbol> </m0:request> </m0:getQuote> </soapenv:Body> </soapenv:Envelope>

...

Analyzing the output

You will see that the inbound polling file listener picks the file from in directory and send sends it to the Axis2 service. The , and that the request XML file will be is moved to original the process directory. The response from the Axis2 server will be saved to out directory.