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Utility function.
We build a list of the versions available of a given template file in
a cache directory. the files will resemble /cache_dir/version.template
s
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getBox: get a BlackBox from this module
@box_cfg: a box_cfg conformant AdmList element containing
the following elements:
path: type string, the path to the context file (required)
returns: CacheBlackBox object
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CacheBlackBoxt box_cfg( R ( ( R t getBox s R c B sD t Z d Z d „ Z d „ Z d „ Z d „ Z d „ Z d „ Z RS( s[
The CacheBlackBox class provides a class to read and write Contexts
from and to files.
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__init__: Initialize a BlackBox
@self: the class instance
@box_cfg: a box_cfg conformant AdmList element containing
the following elements:
cache_dir : a string
template : a string
mode : an integer
i i R s6 CacheBlackBox box_cfg must contain a 'cache_dir' entryR s5 CacheBlackBox box_cfg must contain a 'template' entryt modes1 CacheBlackBox box_cfg must contain a 'mode' entryt depths2 CacheBlackBox box_cfg must contain a 'dapth' entryN( t selft statust __class__t
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ValueErrorR R R ( R R ( ( R t __init__( s.
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isReadable: if a read were attempted now, would it succede?
@self: this BlackBox instance
i i N( R R R R t vlistt len( R R& ( ( R t
isReadableO s
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readVersion: reads a specific version from the cache directiry, if it exists.
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read: read the contents of the CacheBlackBox
@self: this CacheBlackBox instance
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version: returns the version of this CacheBlackBox's context
@self: this CacheBlackBox instance
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write: write the contents of the CacheBlackBox
@self: this CacheBlackBox instance
This function is callable multiple times. It writes a
Context out to the file the CacheBlackBox is initialized with.
It returns 0 on failure, and a non-zero, positive integer
on success.
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