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The local object is a proxy for the remote object, and method invocation on the local object results in remote method invocation on the remote object. An example would be an ATM implementation, where the ATM might hold proxy objects for bank information that exists in the remote server.
A a proxy keeps only one reference on the remote object and maintains its own local reference count. To simplify COM development for C++ developers, Microsoft introduced ATL (Active Template Library) .
Fragmented objects may act like a RPC-based infrastructure or a (caching) smart proxy as well. Therefore, clients cannot distinguish between the access of a local object, a local stub or a local fragment. Full transparency is gained by the following characteristics of fragmented objects. Fragmented object
Stub libraries are crucial in distributed computing, as they allow for local procedure calls to be made to remote objects or services. The client-side stub or proxy is responsible for converting the parameters used in a function call and deconverting the results returned by the server after executing the function, a process known as marshalling ...
The main role is to allow objects to access data and invoke methods on remote objects (objects residing in non-local memory space). Invoking a method on a remote object is known as remote method invocation (RMI) or remote invocation, and is the object-oriented programming analog of a remote procedure call (RPC).
Object references are lightweight objects matching the interface of the real object (remote or local). Method calls on the reference result in subsequent calls to the ORB and blocking on the thread while waiting for a reply, success, or failure.
In this sense, the concept of a live distributed object proxy generalizes the notion of a RPC, RMI, or .NET remoting client-side proxy stub. Behavior. The behavior of a live distributed object is characterized by the set of possible patterns of external interactions that its proxies can engage in with their local runtime environments. These ...
object An object has local state and behavior. An object in this sense is both a subject and an object in the sense used in the access control literature. reference An unforgeable communications channel (protected pointer, opaque address) that unambiguously designates a single object, and provides permission to send messages to that object. message