DLS: A CORBA Service for Dynamic Loading of Code
نویسندگان
چکیده
Dynamic loading of code is needed when rarely used code should be loaded on demand or when the code to be loaded is not known in advance. The latter is often the case in distributed systems as newly developed code should be executed by running (legacy) applications. At the extreme, distributed programming concepts as mobile agents and intelligent proxies rely heavily on dynamic code loading. Some programming languages support dynamic code loading (e.g., Java) whereas others (e.g., C++) need support by the operating system (e.g., for loading and executing shared libraries). We focus on CORBA an object-based, language-independent middleware architecture. Currently CORBA does not support code loading. Therefore, we specify a CORBA Dynamic Loading Service (DLS) that allows for transparently loading of code modules into a local CORBA environment. Our DLS specification is entirely language independent. We also present an implementation of DLS which is able to identify the code implementation that fits best for the current environment. The selection is not only based on programming language and processor architecture but also on versions of available libraries and on locally executed compatibility tests.
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