Figure 11-3 LCE architecture in VS .NET

Encoder Quick Response Code in VS .NET Figure 11-3 LCE architecture
Figure 11-3 LCE architecture
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The following sections cover the main parts of the LCE architecture to provide more information about the event class, publishers,
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Event Class
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The event is defined with an event interface and an event class You need not implement the methods of the event class, because the implementation is done automatically For the automatic generation of this class, just the metadata is needed, so that the automatic generated event class can invoke methods in subscribers that implement the same interface
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Publishers
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The publisher is an application that instantiates event classes and fires events by calling methods of the event class Publishers do not need to be implemented as serviced components; a publisher can be any application type that only has the job to call a serviced component It is often useful for the publisher to be a serviced component (for example, when the publisher also acts as a normal server-side component that is called by a client application)
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Subscribers
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LCEs define two different types of subscribers: persistent and transient A persistent subscriber is a serviced component A persistent subscription is registered within the Enterprise Services configuration This configuration is used to start the subscriber when an event occurs The persistent subscriber may be configured within the same application as the publisher, but usually this is not done A transient subscriber can be implemented with any application type (for example, a transient subscriber can be a Windows Forms application) The transient subscriber must subscribe to the event when it is running; there is no way the transient subscriber can be started automatically when the event occurs Figure 11-4 shows LCEs with transient and persistent subscribers
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Figure 11-4 LCE solution with transient and persistent subscribers
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Filters
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Events can be filtered before they are delivered to the client application You can see the position of a filter in the call flow in Figure 11-5 When the publisher fires an event that has a filter assigned, the event is not directly sent to the subscriber by the event class; instead, the event is filtered before it is forwarded to the subscriber The filter can define that the event is not forwarded to all subscribers, and can also define the order that is used to call back into the subscribers
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Figure 11-5 Filter in the LCE event flow
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You must differentiate between two filter types: a subscriber filter and a publisher filter A subscriber filter is defined by the subscriber application With this type of filter, the subscriber defines interest for an event depending
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks on values of the parameters of the event method (for example, the client is only interested when the parameter ActualStockCount of the method StockChanged has a value lower than 5) A publisher filter is defined by the publishing component If multiple clients are subscribed to a single event, by default there is no guarantee of the order that is used to invoke methods in the client application If you need a specific order to invoke methods in the client application, you can create a publisher filter A publisher filter can also be used to define that not all subscribed clients should be called If the publishing component should influence the way the subscribers are called, a publisher filter is the way to go
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Programming LCEs
To implement LCEs, you must define an event class and create a publisher and a subscriber The event class defines the methods that are invoked by the publisher and implemented by the subscriber Figure 11-6 shows an overview of the example that will be completed in this section The event class CourseOrderEvent implements the interface ICourseOrderEvent with a single method CourseOrder