Page Comparison

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The Point-to-Point Channel EIP pattern allows ensures that only a single receiver to consume consumes a sent message (when there are multiple receivers waiting to consume itthe message). For more information, go to see Point to Point Channel. 

Figure 1: Point-to-Point Channel EIP

Example scenario

The example scenario is uses an inventory for of stocks. It illustrates how a stock quote is generated, which only a single consumer receives at a given time. The diagram below depicts how to simulate the example scenario this example is simulated using the ESB.

Figure 2: Example scenario of the Point-to-Point Channel EIP

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1. Open a new terminal, and navigate to the <ESB_HOME>/samples/axis2Client/ directory. The Stock Quote client application is stored in this directory.

2. Execute the following command to send the request to the ESB.

   Code Block
   ant stockquote -Dtrpurl=http://localhost:8280/services/point-to-point-proxy -Dsymbol=foo

   The structure of the request should be as follows:

   Code Block
   <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>

Analyzing the output

Note that, out of all three instances of the Stock Quote service (Axis2 server), only one server acquires the sent request at a given time.

Stock client response: 

Standard :: Stock price = $81.06211284751495

samples.services.SimpleStockQuoteService :: Generating quote for : foo