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With serviced components, sometimes you not only want to invoke methods, but you also have the serviced component call back into the calling component With Enterprise Services applications, you can do this with the help of loosely coupled events (LCEs) With LCEs, the client is not called directly by the serviced component, but the serviced component publishes events to the COM+ facility instead The COM+ facility forwards the event to clients Specifically, this chapter covers the following topics:
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The architecture of LCEs Programming LCEs Using LCEs across the network LCEs and queued components
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LCE Overview
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With both COM and NET remoting, the component that is running on the server can invoke methods in the client application With both of these technologies, the events are invoked directly from the component in the client application You can see the architecture of COM events in Figure 11-1 The client application must query for the interfaceIConnectionPointContainer and invoke the method FindConnectionPoint to get a reference to the IConnectionPoint interface returned Using the IConnectionPoint interface, the client can pass a reference to the sink object to the server by calling the Advise method The sink object is a COM object that is implemented in the client application After these steps to build up the connection from the server to the client, the server component can invoke methods in the sink object This is not only possible on the local system; with DCOM, it can also be done across the network
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Figure 11-1 COM events
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With a distributed NET solution, NET events can be sent across the network, with the network functionality for events being handled by [1] NET remoting When you use events with NET remoting, the remoting server declares an event that the client uses to register a [2] method that has the same signature as defined with the type of the event The type of an event is a delegate The delegate defines the parameter and return types of the handler method that must be implemented by the client application The client application implements a handler method and registers this method with the event of the remote object After the setup is done, the remote object can call back into the client application by calling the Invoke method of the event In a comparison of NET remoting events to COM events, the NET remoting architecture is simpler The reason is that COM events are fully based on interfaces, whereas NET remoting events allow you to define simple methods With both COM and NET events, the server and client are connected directly, the same event can be delivered to multiple clients, and one client can register to receive events from multiple servers (see Figure 11-2) If multiple clients are connected to one server object, the server object must deal with multiple connections and invoke the handler method with every connection Dealing with these connections becomes extremely important, because the server object has direct connections If a connection to one client fails, the handler method should be invoked with the other client applications that have working connections This does not happen automatically; you must add fail-safe code to invoke the methods in the client yourself
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Figure 11-2 Events with multiple systems
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LCEs add infrastructure support between the server that is publishing events and the client where the events are invoked Figure 11-3 provides an overview of LCEs With LCEs, an event class is registered in the COM+ catalog The event class forwards events that are fired by the publisher to all subscribers There is no need for the publisher to deal with direct connections to the subscribers, because the connection management is done by the event class The event class is automatically generated by the LCE runtime
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