61 lines
1.9 KiB
TeX
61 lines
1.9 KiB
TeX
\section{\module{statcache} ---
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An optimization of \function{os.stat()}}
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\declaremodule{standard}{statcache}
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\sectionauthor{Moshe Zadka}{moshez@zadka.site.co.il}
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\modulesynopsis{Stat files, and remember results.}
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\deprecated{2.2}{Use \function{\refmodule{os}.stat()} directly instead
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of using the cache; the cache introduces a very high level of
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fragility in applications using it and complicates application code
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with the addition of cache management support.}
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The \module{statcache} module provides a simple optimization to
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\function{os.stat()}: remembering the values of previous invocations.
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The \module{statcache} module defines the following functions:
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\begin{funcdesc}{stat}{path}
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This is the main module entry-point.
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Identical for \function{os.stat()}, except for remembering the result
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for future invocations of the function.
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\end{funcdesc}
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The rest of the functions are used to clear the cache, or parts of
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it.
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\begin{funcdesc}{reset}{}
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Clear the cache: forget all results of previous \function{stat()}
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calls.
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\end{funcdesc}
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\begin{funcdesc}{forget}{path}
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Forget the result of \code{stat(\var{path})}, if any.
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\end{funcdesc}
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\begin{funcdesc}{forget_prefix}{prefix}
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Forget all results of \code{stat(\var{path})} for \var{path} starting
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with \var{prefix}.
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\end{funcdesc}
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\begin{funcdesc}{forget_dir}{prefix}
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Forget all results of \code{stat(\var{path})} for \var{path} a file in
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the directory \var{prefix}, including \code{stat(\var{prefix})}.
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\end{funcdesc}
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\begin{funcdesc}{forget_except_prefix}{prefix}
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Similar to \function{forget_prefix()}, but for all \var{path} values
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\emph{not} starting with \var{prefix}.
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\end{funcdesc}
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Example:
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\begin{verbatim}
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>>> import os, statcache
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>>> statcache.stat('.')
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(16893, 2049, 772, 18, 1000, 1000, 2048, 929609777, 929609777, 929609777)
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>>> os.stat('.')
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(16893, 2049, 772, 18, 1000, 1000, 2048, 929609777, 929609777, 929609777)
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\end{verbatim}
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