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41 the REQUESTOR, and hands it over to the client using an ordinary return value.
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The client interacts with the CLIENT PROXY, which supports the same interface as the remote object. The CLIENT PROXY uses the REQUESTOR, as part of the distributed object middleware, to construct and send the remote invocation.
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E E E The CLIENT PROXY uses a REQUESTOR to construct and send invocations across the network. As the CLIENT PROXY is specific to the type of a remote object, it is typically generated from the remote object s INTERFACE DESCRIPTION. To be available on the client side, the CLIENT PROXY has to be deployed to the client somehow. In the simplest case, the source code of the CLIENT PROXY is compiled with the client application. This has the obvious drawback that on every change of the CLIENT PROXY S implementation, the client would need to be recompiled as well. The client should not have to necessarily change because of any CLIENT PROXY changes. Alternatively CLIENT PROXIES can be bound late, for example during loading, linking, or at runtime. That is, the CLIENT PROXY implementation class is designed to be exchangeable in the client. The client uses a stable CLIENT PROXY interface, but the implementation of this interface is provided by the server application, which usually happens during start-up of the client. The distribution of CLIENT PROXIES can also be done as part of a LOOKUP process. This has the advantage that CLIENT PROXIES can be exchanged
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Basic Remoting Patterns transparently. Sometimes this is necessary in cases where the CLIENT PROXY takes part in failover or load-balancing policies. On the downside, this approach incurs the liability of sending CLIENT PROXY implementations across the network. This can be avoided by downloading or sending only the INTERFACE DESCRIPTION to the client, the client generating the late-bound CLIENT PROXY from this interface at runtime. In some rare cases, even the remote object interfaces change during runtime. Such changes can be handled on the server side only, for example in the INVOKER. However, if this is not possible and the client needs to align with the interface change, the use of CLIENT PROXY should be avoided, and clients should use the REQUESTOR directly to construct remote invocations dynamically. To help the client do this, it needs runtime access to the INTERFACE DESCRIPTION, for example by looking it up in an interface repository, by querying the remote object, or by using reflection. Of course, the client s application logic has to be changed in any case if it wants to make use of the new interface provided by the remote object. By directly providing the remote object s interface and by representing a specific remote object directly in the client process, a CLIENT PROXY is typically easier to use than a REQUESTOR, especially for inexperienced developers. Its look-and-feel is more aligned with non-distributed applications, and it provides a higher level of transparency. However, a consequence is that a CLIENT PROXY is less flexible than a Because a CLIENT PROXY uses a REQUESTOR internally, the solution is (slightly) slower and consumes more memory than a pure REQUESTOR solution. After all, we need a dedicated CLIENT PROXY instance for each remote object we want to talk access.
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The CLIENT PROXY applies the Proxy pattern from GoF [GHJV95] and POSA1 [BMR+96] to hide remote communication. POSA1 introduced a variant called Remoting Proxy. The CLIENT PROXY pattern is more specific than Remoting Proxy, as it hides the REQUESTOR but does not handle the remote communication itself.
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A REQUESTOR sends a remote invocation for a remote object to a server. E E E When a client sends invocation data across the machine boundary to the server side, the targeted remote object has to be reached somehow. The simplest solution is to let every remote object be addressed over the network directly. But this solution does not work for large numbers of remote objects, as there may not be enough network endpoints for all the remote objects. Also, the remote object would have to deal with handling network connections, receiving and demarshaling messages, and so on. This is cumbersome and over-complex. If a large number of remote objects were addressed directly over the network, the system would quickly run out of resources such as connection ports, handles, or other system resources, for example the threads used to listen for incoming connections on the communication endpoints. Even if there are only a limited number of associations between clients and remote objects, there are still issues. Client developers would have to be aware of all network addresses of the required remote objects. The mapping of addresses to remote objects would be tedious to establish and maintain. Instead, a client should only have to provide the information necessary to select the appropriate remote object and have the server application deal with dispatching and invoking that object. The remote object implementation should be independent of any communication details, such as listening for incoming invocation messages, as well as demarshaling/marshaling of invocation parameters. Keeping this responsibility in the remote object itself is not a good example of the practice of separation of concerns. Additionally, in some cases the remote object might not be available all the time and only be activated on demand, which requires some part of the system to accept invocations and trigger the (re-)activation of the target remote object.
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