Class: CachingRegistry

• Inheritance
• Description
• Related information
• Class protocol
  • instance creation
• Instance protocol
  • enumerating
  • private
  • registering objects

Inheritance:

   Object
   |
   +--Collection
      |
      +--Set
         |
         +--Dictionary
            |
            +--IdentityDictionary
               |
               +--WeakIdentityDictionary
                  |
                  +--Registry
                     |
                     +--CachingRegistry

Package:

stx:libbasic

Category:

System-Support

Version:

rev: 1.11 date: 2016/11/18 15:25:05

user: stefan

file: CachingRegistry.st directory: libbasic

module: stx stc-classLibrary: libbasic

Author:

Claus Gittinger (cg@exept)

Description:

A CachingRegistry behaves generally like a registry;
However, it keeps hard references to the last n registered objects,
preventing them from being garbage collected (and finalized).
This is useful for resources, which do not cost too much memory,
but are expensive to allocate - a special candidate of this kind are
XFonts. With a CachingRegistry, fonts are kept a bit longer alive
and can therefore often be reused - even if temporarily unreferenced.

This is kind of experimental.



[instance variables:]
    keptObjects             Collection      hard referenced objects
    cacheSize               Integer         number of hard references

Related information:

Class protocol:

 new: cacheSize

Instance protocol:

 detect: aBlock ifNone: exceptionValue

... additionaly move it to the front of the LRU chain

 cacheSize: aNumber

 register: anObject as: aHandle

 removeKey: anObject ifAbsent: absentBlock

 safeRemoveKey: anObject