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TargetRouter Request Messaging Router Response Server
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Figure 5-24. Using routers to bridge the Internet Any number of intermediate routers may be involved in the client-to-server path. The router closest to the client is called a ClientRouter; the router closest to the server is called a TargetRouter. A ClientRouter exposes a custom interface to its client and acts as a proxy. Clients interact with the ClientRouter as if it were the actual server. On the other end, servers interact with the TargetRouter as if it were the actual client. Intermediate routers talk to other routers using a standard set of interfaces.
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COM+10 is a COM-based framework designed for enterprise systems. The event model in COM was designed using a direct-delivery model, making it ill versed for highly scalable systems. In COM+, the event model was changed to support an indirect-delivery model, based on a centralized COM+ Event Service. The Microsoft literature refers to COM+ events as loosely coupled events (LCE). COM+ event publishers and subscribers never interact directly, but rather through the COM+ Event Service, which handles both subscriptions and notifications. COM+ notifications are COM objects. You must register interfaces used by COM+ notifications with the COM+ Event Service. Subscribers wishing to receive notifications of a given type must implement the corresponding interface and register themselves with the Event Service. For example, to receive IMyEventType notifications, a subscriber would have to implement the IMyEventType interface, as shown in Figure 5-25.
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10. David S. Platt, Understanding COM+ (Redmond, WA: Microsoft Press, 1999).
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CHAPTER 5 A SURVEY OF COMMERCIAL SYSTEMS
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interface IMyEventType +Method1() +Method2() +Method3()
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MyEvent
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Figure 5-25. A simple event COM object exposing a user-defined interface The Event Service maintains a list of subscribers in an internal cache. Subscribers can specify which methods they support of a particular interface. To fire an event, the publisher must create an object that implements an event interface, then call one of its methods. When the publisher creates an event object using standard COM functions like CreateObject, the COM+ Event Service handles the call, returning a COM+ object that routes all calls to its event interface methods to the Event Service. For example, to fire an IMyEventType.Method1 event, a publisher might create an object called MyEvent. This object implements the interface IMyEventType, which is registered with the COM+ Event Service as an event interface. The publisher fires events by calling MyEvent.Method1, which is routed to the Event Service. At this point, the Event Service searches the subscriptions cache, looking for subscriptions that apply to IMyEventType. For each subscriber found, the designated interface method (e.g., IMyEventType.Method1) is called. Figure 5-26 shows the basic dynamics.
COM+ Event System Publisher MyEvent Subscriptions IMyEventType
Transient
Persistent
Subscriber
Figure 5-26. How the COM+ Event Service handles event-notification delivery The way the COM+ Event Service delivers notifications to subscribers depends on the subscription type used, described in the next section.
Subscription Types
The COM+ Event Service supports two types of subscriptions: transient and persistent. Transient notifications are really just messages that are delivered using a point-to-point interaction. They are kept in a memory cache until they are delivered, so if the system crashes before delivery, they are lost. Transient notifications can be used only with point-to-point interactions, so the sender must always identify the recipient. The recipient must be running when the event is fired, because the Event Service doesn t support deferred delivery and has no control over the life cycle of the recipient. With persistent subscriptions, the event publisher doesn t indicate a specific subscriber. No subscribers need to be running when an event is fired, because the Event Service is responsible for the subscriber s life cycle. When an event is fired and a persistent subscription is found for it, the COM+ Event Service creates the associated subscriber, delivers the notification to it, and then destroys the subscriber. Persistent subscriptions are kept on disk, so they survive system restarts. A persistent subscription can have any number of subscribers.
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