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Invocation Context
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Add-on services are plugged into the distributed object middleware. E E E Remote invocations typically only contain necessary information, such as operation name, OBJECT ID, and parameters. But INVOCATION INTERCEPTORS often need additional information to provide add-on services. A straightforward solution would be to add this information to the operation signature of remote objects. But this would prevent the transparent integration of add-on services, which is the goal in the first place, as signatures would change depending on the requirements of the add-on services. Changing operation signatures for reasons other than business logic is tedious and error-prone. When the server application has to provide add-on services transparently, the client-side and the server-side distributed object middleware have to share contextual information, such as a transaction ID or security credentials. If this information changes on either the client or server side, it needs to be transported to the other side. In the case of transactions, the transaction ID has to be transported between client and server for every remote invocation, so that both can participate in the same transaction. The operation signature of remote objects should not need to be changed to transport this additional information. This is not only because it is tedious to maintain, but also because the contextual information is not always necessary, since the add-on service may be optional and can be turned on and off. If contextual information were to be part of the operation signature, it would waste network bandwidth in the case in which the add-on service is turned off. In general, contextual information required by add-on services cannot be anticipated by either the distributed object middleware itself, or by remote object developers it needs to be extensible independently. Therefore: Bundle contextual information in an extensible INVOCATION CONTEXT data structure that is transferred between client and remote object with every remote invocation. For transparent integration, INVOCATION INTERCEPTORS can be used to add and consume this information.
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Extension Patterns The format and data types used for the contextual information in the INVOCATION CONTEXT depend on the use case.
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Process A
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The client invokes an operation. The REQUESTOR adds the required contextual information in the INVOCATION CONTEXT. The INVOKER extracts the information, uses it, and invokes the operation of the remote object. Typically, the information is added and used by application-specific INVOCATION INTERCEPTORS.
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E E E Insertion, extraction, and use of INVOCATION CONTEXT information is hidden inside distributed object middleware components, specifically INVOCATION INTERCEPTORS, the REQUESTOR, or the INVOKER. The application logic of clients and remote objects remains independent of INVOCATION CONTEXT information. This works well because in most cases the information in the INVOCATION CONTEXT is only of interest to the add-on service. For situations in which the remote object needs access to INVOCATION CONTEXT data, the distributed object middleware provides a well-defined API. The data in the INVOCATION CONTEXT has to be marshaled just like every other item of information contained in an invocation. As a consequence, the same limitations apply as for operations parameters: the MARSHALLER used must support the data types used. The client- and server-side components that make use of the INVOCATION CONTEXT information must adhere to the same protocol, which means they must agree on a common data structure inside the INVOCATION CONTEXT. Using INVOCATION CONTEXTS, add-on services such as transaction support or security can communicate transparently, that is, without the explicit support of clients and remote objects. The remote objects are kept independent of any contextual data transferred. While INVOCATION CONTEXTS provide a useful and flexible extension mechanism, using them increases the footprint of every remote invocation to which they are added.
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