Difference: TWikiPrefsPrefsCacheDotPm (1 vs. 2)

Revision 22006-10-25 - TWikiContributor

  Package TWiki::Prefs::PrefsCache 

The PrefsCache package holds a cache of topics that have been read in, using
the TopicPrefs class.  These functions manage that cache.

We maintain 2 hashes of values: 

 {locals} Contains all locals at this level. Locals are values that     only apply when the current topic is the topic where the local is     defined. The variable names are decorated with the locality where     they apply.
  {values} contains all sets, locals, and all values inherited from     the parent level
 

As each cache level is built, the values are copied down from the parent
cache level. This sounds monstrously inefficient, but in fact perl does
this a lot better than doing a multi-level lookup when a value is referenced.
This is especially important when many prefs lookups may be done in a
session, for example when searching.


On this page: 
  ClassMethod new ($prefs,$parent,$type,$web,$topic,$prefix)
   ObjectMethod finish ()
   ObjectMethod finalise ($parent)
   ObjectMethod loadPrefsFromTopic ($web,$topic,$keyPrefix)
   ObjectMethod loadPrefsFromText ($text,$meta,$web,$topic)
   ObjectMethod insert ($type,$key,$val) -> $boolean
   ObjectMethod stringify ($html,\%shown) -> $text
 


 ClassMethod new ($prefs,$parent,$type,$web,$topic,$prefix) 

Creates a new Prefs object. 

 $prefs - controlling TWiki::Prefs object
  $parent - the PrefsCache object to use to initialise values from
  $type - Type of prefs object to create, see notes.
  $web - web containing topic to load from (required is $topic is set)
  $topic - topic to load from
  $prefix - key prefix for all preferences (used for plugins)
 
If the specified topic is not found, returns an empty object.



 ObjectMethod finalise ($parent) 
Finalise preferences in this cache, by freezing any preferences
listed in FINALPREFERENCES at their current value. 
 $parent = object that supports getPreferenceValue
 



 ObjectMethod loadPrefsFromTopic ($web,$topic,$keyPrefix) 

Loads preferences from a topic. All settings loaded are prefixed
with the key prefix (default '').
-<
<
+ ObjectMethod loadPrefsFromText ($text,$web,$topic)
->
>
+ ObjectMethod loadPrefsFromText ($text,$meta,$web,$topic)
-<
<
+Loads preferences from a topic. All settings loaded are prefixed
with the key prefix (default '').
->
>
+Loads preferences from text and optional metadata. All settings loaded
are prefixed with the key prefix (default ''). If $meta is defined,
->
>
+then metadata will be taken from that object. Otherwise, $text will
be parsed to extract meta-data.
  ObjectMethod insert ($type,$key,$val) 
Adds a key-value pair of the given type to the object. Type is Set or Local.
Callback used for the Prefs::Parser object, or can be used to add
arbitrary new entries to a prefs cache.

Note that attempts to redefine final preferences will be ignored.



 ObjectMethod stringify ($html,\%shown) -> $text 
Generate an (HTML if $html) representation of the content of this cache.

Revision 12006-02-01 - TWikiContributor

Package `TWiki::Prefs::PrefsCache`

The PrefsCache package holds a cache of topics that have been read in, using the TopicPrefs class. These functions manage that cache.

We maintain 2 hashes of values:

{locals} Contains all locals at this level. Locals are values that only apply when the current topic is the topic where the local is defined. The variable names are decorated with the locality where they apply.
{values} contains all sets, locals, and all values inherited from the parent level

As each cache level is built, the values are copied down from the parent cache level. This sounds monstrously inefficient, but in fact perl does this a lot better than doing a multi-level lookup when a value is referenced. This is especially important when many prefs lookups may be done in a session, for example when searching.

On this page:

ClassMethod new `($prefs,$parent,$type,$web,$topic,$prefix)`

Creates a new Prefs object.

$prefs - controlling TWiki::Prefs object
$parent - the PrefsCache object to use to initialise values from
$type - Type of prefs object to create, see notes.
$web - web containing topic to load from (required is $topic is set)
$topic - topic to load from
$prefix - key prefix for all preferences (used for plugins)

If the specified topic is not found, returns an empty object.

ObjectMethod finalise `($parent)`

Finalise preferences in this cache, by freezing any preferences listed in FINALPREFERENCES at their current value.

$parent = object that supports getPreferenceValue

ObjectMethod loadPrefsFromTopic `($web,$topic,$keyPrefix)`

Loads preferences from a topic. All settings loaded are prefixed with the key prefix (default '').

ObjectMethod loadPrefsFromText `($text,$web,$topic)`

Loads preferences from a topic. All settings loaded are prefixed with the key prefix (default '').

ObjectMethod insert `($type,$key,$val)`

Adds a key-value pair of the given type to the object. Type is Set or Local. Callback used for the Prefs::Parser object, or can be used to add arbitrary new entries to a prefs cache.

Note that attempts to redefine final preferences will be ignored.

ObjectMethod stringify `($html,\%shown) -> $text`

Generate an (HTML if $html) representation of the content of this cache.

View topic | History: r4 < r3 < r2 < r1 | More topic actions...

Copyright © 1999-2026 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback
Note: Please contribute updates to this topic on TWiki.org at TWiki:TWiki.TWikiPrefsPrefsCacheDotPm.