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From Apache Wiki <wikidi...@apache.org>
Subject [Mod_python Wiki] Update of "Session use with classes" by RoyFielding
Date Mon, 26 Mar 2007 23:50:45 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Mod_python Wiki" for change notification.

The following page has been changed by RoyFielding:
http://wiki.apache.org/mod_python/Session_use_with_classes

------------------------------------------------------------------------------
  ----
  [[Anchor(ExampleStackedHandler)]]
  ==== 1. Using the Stacked Handler ====
- Your nominal URL for this example will be
+ Your nominal URL for this example will be 
  {{{
  http://your.domain.com/ExampleSession/ExampleStackedHandler.py/foo
  }}}
@@ -35, +35 @@

      PythonHandler mod_python.publisher
  </Directory>
  }}}
- Notice there are two '''Python``Handler''' entries here. When invoked, Apache will call
these in order. The first calls a file ''_sessions.py''.
+ Notice there are two '''Python``Handler''' entries here. When invoked, Apache will call
these in order. The first calls a file ''_sessions.py''. 
  
  {{{#!python
  # Save this file as _sessions.py
@@ -94, +94 @@

  
  [[Anchor(ExampleInstance)]]
  ==== 2. Using a class Instance ====
- Your nominal URL for this example will be
+ Your nominal URL for this example will be 
  {{{
  http://your.domain.com/ExampleSession/ExampleInstanceSession.py/foo
  }}}
@@ -157, +157 @@

  As you see, we are not instantiating the '''Example``Session''' class directly, but using
the '''Instance''' class to create a new Example``Session object each time a call is made
to the request handler. This avoids the possibility of gumming up the works in Apache if concurrent
worker threads are all executing the same handler.
    Advantages:: (./) This allows you to have a mixture of non-session and session enabled
funxtions/classes in a single package. Those not needing a session context are not required
to implement this solution.
    :: (./) You have access to the ''req'' object before your working class is called. This
allows you to initialize it with info from the request Form``Object (if available).
- 
+  
    Disadvantages:: (./) The Instance class is duplicated in all modules. If you have a large
python package, this is an inefficient manner to implement Sessions.
  
  Note that in both of these prior examples, the '''Example``Session''' class remained the
same.
@@ -168, +168 @@

  ==== 3. Using a class to invoke functions ====
  
  This last example is a bit of an odd-ball, we see how to use a class to invoke a selection
of methods defined in the same module. This is not common practice, but maybe it will give
you some ideas.
- Your nominal URLs for this example will be
+ Your nominal URLs for this example will be 
  {{{
  http://your.domain.com/ExampleSession/ExampleFunctionSession.py/foo
  http://your.domain.com/ExampleSession/ExampleFunctionSession.py/bar
@@ -219, +219 @@

  }}}
  
  This should give you a working starting point. From here the sky is the limit!
- ----
+ ---- 
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