This section explains how the Message EIP can be implemented using WSO2 ESB. The following topics are covered:
Introduction to Message
In an enterprise that uses Message Channels to connect between two different applications, you must package information as a data set. Data sets facilitate information transmission from one application to another. The Message EIP is used as the transfer medium in this case. A message has two parts: a header and a body. A header holds information about the data being transmitted, its origin, and its destination. A body holds the actual data.
For more information on the Message EIP, refer to http://www.eaipatterns.com/Message.html.
Figure 1: Message EIP
How WSO2 ESB supports the Message EIP
As described in Messaging Bridge, irrespective of the format of a request you send from the client application, WSO2 ESB transforms the message into a SOAP envelope, which adheres to the Message EIP. The following code segment illustrates the transformed message of a typical request. Notice that it has a header and a body.
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.samples" xmlns:xsd="http://services.samples/xsd">
<soapenv:Header />
<soapenv:Body>
<ser:getQuote>
<ser:request>
<ser:symbol>Foo</ser:symbol>
</ser:request>
</ser:getQuote>
</soapenv:Body>
</soapenv:Envelope>