UNDERSTANDING SUBSCRIBED REPORT DELIVERY in VB.NET

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UNDERSTANDING SUBSCRIBED REPORT DELIVERY
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The subscriber-publisher design pattern The RS subscribed delivery model follows the subscriber-publisher (also called observer) design pattern. This pattern is very popular with many modern programming frameworks. For example, one of the main reasons for the immense success of Microsoft Windows is its event-driven architecture. Figure 12.1 shows how you can use the subscriber-publisher programming model in your applications.
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Figure 12.1 In the subscriber-publisher model, the client (subscriber) subscribes to one or more events. When the event occurs, the publisher notifies the subscriber.
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The process is initiated by the subscriber b when it informs the publisher of its intent to be notified when a certain event of interest takes place. When the event occurs c, the publisher notifies the subscriber d about the event s occurrence. The publisher typically runs in unattended mode, such as a background service listening to incoming events. For example, as I type on my laptop keyboard, each keystroke generates a hardware interrupt request. The CPU intercepts the request and generates a software interrupt. The event traverses the operating system and application layers to output the character on the screen. In this example, you can view the keystroke as an event source, the CPU as a publisher, and the OS and application layers as subscribers. Let s now see how the subscriber-publisher pattern applies to the RS subscriptionbased delivery mechanism. 12.1.3 How the RS subscription-based model works In a nutshell, when a report is scheduled for subscribed delivery, report processing is triggered as a result of an event, such as a timing event from a schedule. The generated report is then delivered asynchronously to its subscribers, as shown in figure 12.2. With RS, here s how the subscriber-publisher pattern applies: the subscriber is typically the report s end user who subscribes himself or other users on their behalf. For example, a manager could subscribe herself and her subordinates to receive a report. The publisher is the Report Server, and the event source is the SQL Server Agent.
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Figure 12.2 With the subscription-based report delivery model, the report processing is triggered by an event and the generated report is delivered asynchronously to its subscribers.
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To better understand the process flow, we could break down subscribed report delivery into two phases: Creating the report subscription interactively by the user Processing and delivering the report asynchronously In the sections that follow, we refer back to figure 12.2 to explain each phase. Creating report subscriptions While we are not excluding the possibility of more sophisticated ways to generate subscriptions, such as by applications running in unattended mode, typically the user will create the subscription interactively by using a client application, which we call a report consumer. For example, the user could access b the Report Manager to initiate the subscription process. Once user has entered the subscription details, the report consumer invokes c one of the CreateSubscriptionXXX RS Web service SOAP APIs to save d the subscription details in the Report Catalog and schedule the subscription.
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Some of you may need to create subscriptions programmatically using the SOAP API. The documentation has good examples of how this could be done for both subscription types supported by RS. For this reason, we decided not to include a code sample to demonstrate this concept. If the documentation samples are not enough, you can use the tracing technique we showed you in chapter 8 to find out how the Report Manager uses the Web service API to create and schedule subscriptions.
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At this point, the Report Server has saved the subscription details in the Subscriptions table in the report catalog, and control is returned to the report consumer. This step concludes the interactive, synchronous part of the subscription process.
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