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This chapter is from the book

This chapter is from the book

Out-In Example and Implementation Options

The process of the newspaper making an offer to a subscriber and then handling the response is shown in Figure 11-17. The interactions here are, by definition, asynchronous: Neither party is actively waiting for an input. Furthermore, the service provider (the newspaper) will likely have separate threads (or applications) for sending the offers and processing the responses. Consequently, there will likely be a need to communicate context information between these two threads as was discussed in the earlier asynchronous In-Out example.

Figure 11-17

Figure 11-17 Make Offer Process

As with the Out-Only pattern, the only suitable protocol and transport combination available in ActiveMatrix is XML over JMS. The SCA design would be similar to that discussed in the Out-Only example, and the JMSCorrelationID and JMSReplyTo properties would have to be used as described in the Asynchronous In-Out example.

There are five implementation types that would be appropriate for the newspaper: BusinessWorks, Java, C++, and Spring. There are four that would be appropriate for the subscriber: BusinessWorks, Java, C++, and Spring. Note that WebApp would not be appropriate for either role since its input is just the raw HTTP protocol.

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