related topics
{system, computer, user}
{math, number, function}
{language, word, form}

XPCOM (Cross Platform Component Object Model) is a cross-platform component model from Mozilla. It is similar to CORBA and Microsoft COM. It has multiple language bindings and IDL descriptions so programmers can plug their custom functionality into the framework and connect it with other components.


The model

XPCOM is one of the main things that makes the Mozilla application environment an actual framework. It is a development environment that provides the following features for the cross-platform software developer:

This component object model makes virtually all of the functionality of Gecko available as a series of components, or reusable cross-platform libraries, that can be accessed from the web browser or scripted from any Mozilla application. Applications that want to access the various Mozilla XPCOM libraries (networking, security, DOM, etc.) use a special layer of XPCOM called XPConnect, which reflects the library interfaces into JavaScript (or other languages). XPConnect glues the front end to the C++ or C programming language-based components in XPCOM, and it can be extended to include scripting support for other languages: PyXPCOM already offers support for Python, PerlConnect [1] and plXPCOM [2] provide support for Perl, and there are efforts underway to add .NET and Ruby language support for XPConnect.

On the developer side, XPCOM lets you write components in C++, C, JavaScript, Python, or other languages for which special bindings have been created, and compile and run those components on dozens of different platforms, including these and others where Mozilla itself is supported.

The flexibility to reuse the XPCOM components from the Gecko library and develop new components that run on different platforms facilitates rapid application development and results in an application that is more productive and easier to maintain. The networking library, for example, is a set of XPCOM components that can be accessed and used by any Mozilla application. File I/O, security, password management, and profiles are also separate XPCOM components that programmers can use in their own application development.

Full article ▸

related documents
Monolithic kernel
Run-length encoding
Parasitic computing
Remote procedure call
IBM 1620 Model I
Access control list
Synchronized Multimedia Integration Language
Creator code
OpenGL Utility Toolkit
Portable Distributed Objects
Microsoft BASIC
Analytical engine
Program counter
Server-side scripting
Ed (text editor)
Adapter pattern
Pseudonymous remailer
Wide area information server
Pentium FDIV bug
Z3 (computer)
LZ77 and LZ78
Distributed-queue dual-bus
Wikipedia:Federal Standard 1037C terms/computer programming terms
CHS conversion