Glossary

service

A →server provides services. Services are generally provided in rpc-like interfaces in an API. Services are thus called. T-ORB provides an object-oriented API. Functions, class methods and instance methods can be called remotely (with transaction monitoring). →Stubs relieve the application of the task of dealing with communication details.

shadowed attribute

A shadowed attribute is an attribute inherited from a base class (Base::attr) that

redefines (Derived::attr) the inheriting class (class Derived : public Base). In C++, this type of attribute can be addressed in the name scope of the base class (Base::attr) as well as in that of the derived class (Derived::attr).

signature

The signature of an operation consists of the type list of parameters used in the operation.

skeleton

In CORBA terminology, a skeleton is the same as the →external interface under GINA.

smart pointer

The term smart pointer is used in C++ to refer to classes which overload the derefer- encing operators * and ->. Smart pointers are often used to access →persistent objects (see Persistency Service), or to access remote objects (see T-ORB).

stub

A stub shields the client application from the details of a →remote call. A stub method or stub function can be called in the same way as a local method. The parameters are encoded, the remote call is actually made and the results are decoded, if necessary, within the stub method or stub function.

A representative object is needed for calling methods. We call this a stub object or a proxy. In DCE, we talk about a client stub, rather than a stub.

synchronous request/call

In the case of the T-ORB procedure synchronous call, a client waits for the result of a synchronous request/call, thereby blocking further operations. A normal C++ function or method call is a synchronous call.

Furthermore, T-ORB allows clients to make a number of synchronous, remote requests in parallel. The client waits until the results of all the calls have been received.

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GINA V4.0 System Administrator Guide – September 2000

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Siemens V 4.0 manual Service, Shadowed attribute, Signature, Skeleton, Smart pointer, Stub, Synchronous request/call
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V 4.0 specifications

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