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By Ulrich Lang; Rudolf Schreiner

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Extra info for Developing secure distributed applications with CORBA

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The client-side ORB handles the invocation request from the client and selects the related servers and methods. It validates arguments against the interfaces and sends the request to the server side ORB or activation component. The application can invoke methods synchronously or asynchronously. The ORB is linked into the client application itself. The interface repository stores modules of interface information (object references), including descriptions of the operations that are valid for a given object and the arguments that are valid for an operation.

The application programmer implements the actual object functionality within the stubs and skeletons). • Add-on CORBA services such as a naming service, a transaction service, or a security service can be installed to enrich CORBA’s middleware functionality. These products are often provided by highly specialized third-party vendors. 6 shows the main components of CORBA and how they are interrelated. The following sections offer a brief explanation of the different APIs used during the CORBA invocation process.

24 Developing Secure Distributed Systems with CORBA • The ORB library that gets linked into the application code and acts as a proxy for all remote method invocations. This library contains the implementation for the CORBA protocols. • Some CORBA implementations use some kind of activation daemon that listens for requests to the host on which it resides, and restarts the called target ORB and target application object. The advantage is that not all target ORB and application objects on the host need to run on a permanent basis.

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