This section explains, through an example scenario, how the Message Dispatcher EIP can be implemented using WSO2 ESB. The following topics are covered:
| Table of Contents |
|---|
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| Message Dispatcher EIP (Figure 1) | Message Dispatcher Example Scenario (Figure 2) |
|---|---|
| Sender | Simple Stock Quote Client |
| Messages | Simple Stock Quote Requests |
| Message Dispatcher | Message Endpoint, Load-Balance Endpoint |
| Performers | Simple Stock Quote Server Instances |
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- Download and install WSO2 ESB from http://wso2.com/products/enterprise-service-bus. For a list of prerequisites and step-by-step installation instructions, refer to Getting Started in the WSO2 ESB documentation.
- Start three sample Axis2 server instances on ports 9000, 9001, and 9002. For instructions, refer to the section Setting Up the ESB Samples Setup - Starting Sample Back-End Servicesthe Axis2 server in the WSO2 ESB documentation.
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Simulating the sample scenario
Repeatedly send several requests to the ESB using the Stock Quote client as follows:
ant stockquote -Dtrpurl=http://localhost:8280/ -Dsymbol=foo
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Let's investigate the elements of the ESB configuration in detail. The line numbers below refer to the ESB configuration shown above.
- endpoint [line 13 in ESB config] - Defines the endpoint where the request should be sent.
- loadbalance [line 14 in ESB config] - Defines a set of endpoints where incoming requests are distributed using a particular algorithm. In this example, the algorithm distributes messages in a weighted round-robin manner.