Sample 700: Introduction to Message Store

Introduction

This sample demonstrates the basic functionality of a message store.

Prerequisites

For a list of prerequisites, see Prerequisites to Start the ESB Samples.

Building the sample

The XML configuration for this sample is as follows: 

<!-- Introduction to the Synapse Message Store -->
<definitions xmlns="http://ws.apache.org/ns/synapse">
    <sequence name="fault">
        <log level="full">
            <property name="MESSAGE" value="Executing default 'fault' sequence"/>
            <property name="ERROR_CODE" expression="get-property('ERROR_CODE')"/>
            <property name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/>
        </log>
        <drop/>
    </sequence>
    <sequence name="onStoreSequence">
        <log>
            <property name="On-Store" value="Storing message"/>
        </log>
    </sequence>
    <sequence name="main">
        <in>
            <log level="full"/>
            <property name="FORCE_SC_ACCEPTED" value="true" scope="axis2"/>
            <store messageStore="MyStore" sequence="onStoreSequence"/>
        </in>
        <description>The main sequence for the message mediation</description>
    </sequence>
    <messageStore name="MyStore"/>
</definitions>

This configuration file  synapse_sample_700.xml is available in the <ESB_HOME>/repository/samples directory.

To build the sample

1. Start the ESB with the sample 700 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

The sample client used here is the Stock Quote Client, which can operate in several modes. For further details on this sample client and its operation modes, see Stock Quote Client.

To execute the sample client

• Run the following command from the <ESB_HOME>/samples/axis2Client directory:

  ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/ -Dmode=placeorder
  

Analyzing the output

When you execute the client you will see that the message is dispatched to the main sequence.

In the main sequence, the store mediator will store the  placeorder request message in the MyStore message store. Before storing the request, the message store mediator will invoke the  onStoreSequence  sequence.

Analyze the output debug messages and you will see the following log:

INFO - LogMediator To: http://localhost:9000/services/SimpleStockQuoteService, WSAction: urn:placeOrder, SOAPAction: urn:placeOrder, ReplyTo: http://www.w3.org/2005/08/addressing/none, MessageID: urn:uuid:54f0e7c6-7b43-437c-837e-a825d819688c, Direction: request, On-Store = Storing message

You can then use the JMX view of the Synapse message store by using the jconsole in order to view the stored messages and delete them.