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Before digging into implementation details, let's take a look at the relationship between the example scenario and the Recipient List EIP by comparing their core components.

Recipient List EIP (Figure 1)Recipient List Example Scenario (Figure 2)
Recipient ListRecipientList mediator
Receivers (A, B, C, D)SimpleStockQuote Service Instances (foo, WSO2)

Environment setup

  1. Download and install WSO2 ESB from For a list of prerequisites and step-by-step installation instructions, refer to Installation Guide in the WSO2 ESB documentation. 
  2. Deploy the SimpleStockQuoteService and start three instances of Axis2 Server in ports 9000, 9001, 9002, and 9003. For instructions, refer to the section Setting up the ESB Samples - Starting the Axis2 server in the WSO2 ESB documentation.
  3. You need four Axis2 servers as follows:

    -http 9000 -https 9004 -name MyServer1
    -http 9001 -https 9005 -name MyServer2
    -http 9002 -https 9006 -name MyServer3
    -http 9003 -https 9007 -name MyServer4

ESB configuration

Start the ESB server and log into its management console UI (https: //localhost:9443/carbon ). In the management console, navigate to the Main menu and click Source View in the Service Bus section. Next, copy and paste the following configuration, which helps you explore the example scenario, to the source view.



Note that the ESB sends the request to servers running on ports 9002 and 9003. If you change the symbol to foo, it will send the requests to servers running on port 9000 and 9001

you see the following output in Axis2 9002 and 9003 servers: 

Standard :: Stock price = $97.2597329576317

Server ouput: :: Generating quote for : WSO2

you see the following output in Axis2 9000 and 9001 servers: 

Standard :: Stock price = $65.69553059675577

Server ouput: :: Generating quote for : foo

How the implementation works