By Henry Balen
Dispensed item Architectures with CORBA is a advisor to designing software program made from allotted elements. whereas it's according to OMG's universal item Request dealer structure (CORBA) average, the foundations additionally observe to structure outfitted with different know-how (such as Microsoft's DCOM). As ORB items evolve to include new additions to CORBA, the data and adventure required to construct strong and scalable structures isn't really frequent. With this quantity the reader can enhance the abilities and data which are important for development such platforms. The e-book assumes a familiarity with object-oriented strategies and the fundamentals of CORBA. software program builders who're new to construction platforms with CORBA-based applied sciences will locate this an invaluable consultant to potent improvement.
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Extra resources for Distributed Object Architectures with CORBA
The coordinator builds a tree of all objects in the transaction; this is used to ensure that an object has received replies for all of its requests. This is useful if any of the transactional method invocations are deferred synchronous (for a description of deferred synchronous, see the discussion of DII in Chapter 4). Context management Client programs may use direct or indirect context management to manage a transaction. • Indirect Context Managementâ The Current object is associated with the current thread of control and is used to manage the transaction.
There are some, though minimal, interfaces that a programmer can use to interface with the security service. • Level 2â In addition to supporting the features of a level 1 implementation, there are a set of interfaces (specified in IDL, of course) that the application programmer can utilize to interact with features of the security service. More fine-grained control of security features can be applied by the application, such as the quality of protection, mechanisms for delegation of credentials, options for audit, and so on.
The underlying security services used are not visible to the users of the security model. In the case of a Level 1 implementation, the authentication mechanism is usually supplied by the underlying security technology. For example, IONA's security service implementation uses DCE Security as the underlying technology and users would be authenticated as part of the DCE Cell. Security-aware applications, using interfaces supplied with Level 2 of the CORBA security service, could ask the user for identification and proceed to authenticate the user with the principal authenticator.
Distributed Object Architectures with CORBA by Henry Balen