Bommels05/Mozilla
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

XPCOM Code FAQ. Initial version.

Browse Source 
git-svn-id: svn://10.0.0.236/trunk@24809 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
dp%netscape.com
1999-03-23 07:27:30 +00:00
parent a0d40e6afd
commit c6eaa5a121
1 changed files with 60 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
mozilla/xpcom/doc/xpcom-code-faq.html Normal file
View File

@@ -0,0 +1,60 @@
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Mozilla/4.51 [en] (X11; U; Linux 2.0.36 i686) [Netscape]">
<meta name="Author" content="Suresh Duddi">
<title>XPCOM Code FAQ</title>
</head>
<body>
<h2>
XPCOM Code FAQ</h2>
Suresh Duddi &lt;<a href="mailto:dp@netscape.com">dp@netscape.com</a>>
<br>Last Modified: March 22 1999
<br>
<hr WIDTH="100%">
<br>I am documenting things randomly as I am replying to people's questions.
So this might look more like an FAQ.
<h4>
What are the Global Objects that XPCOM maintains</h4>
<ul>mGlobalServiceManager
<br>mGlobalComponentManager</ul>
<h4>
What are the static classes that XPCOM maintains</h4>
<blockquote>nsComponentManager
<br>nsServiceManager</blockquote>
<h4>
Is there any restriction on which static class I should call first</h4>
<blockquote>No restrictions. You can call any function from the static
classes nsComponentManager and nsServiceManager. XPCOM will do the right
thing to initialize itself at both places.</blockquote>
<h4>
What is the order of creation of the ServiceManager, ComponentManager and
Registry</h4>
<blockquote>Init_XPCOM()
<br>&nbsp;&nbsp;&nbsp; create the global component manager
<br>&nbsp;&nbsp;&nbsp; create the global registry and register as service
with global service manager
<br>&nbsp;&nbsp;&nbsp; create the global component manager and register
as service with the global service manager
<p>Now the hard problem is when to trigger Init_XPCOM() There are two static
objects nsComponentManager and nsServiceManager. Any function in either
of them can be called first. Today nsServiceManager::GetService() is the
first one that gets called. All the members of the static nsServiceManager
use the nsGetGlobalServiceManager() to get to the global service manager.
All members of the static nsComponentManager use the nsGetGlobalComponentManager()
to get to the global component manager. Hence if we trigger Init_XPCOM()
from both NS_GetGlobalComponentManager() and NS_GetGlobalServiceManager()
we will be safe.</blockquote>
<hr WIDTH="100%">
</body>
</html>