atcache(3) AtFS Toolkit Library atcache(3)NAME
atSaveCache, atCacheKey - derived object cache handling
SYNOPSIS
#include <atfs.h>
#include <atfstk.h>
int atSaveCache (Af_key *aso, Af_key *cachedAso, char *uniqAttribute, int storeType);
char*atCacheKey (Af_key *aso);
DESCRIPTION
atSaveCache adds the given busy object aso to the current derived object cache. It does this by calling af_savecache (manual page
af_cache(3)). Prior to that, atSaveCache attaches a key attribute with the name __CacheKey__ to aso, by which the resulting cached object
can be uniquely identified within the cache. Return values are the same as from af_savecache (manual page af_cache(3)).
atCacheKey returns an attribute string consisting of the attribute name __CacheKey__ and an attribute value built of the aso modification
date, the process number and a (per process unique) serial number. This attribute can (and will) be used to uniquely identify attributed
software objects in derived object caches.
SEE ALSO af_cache(3)AtFStk-1.12 Fri Jun 25 16:39:33 1993 atcache(3)
Check Out this Related Man Page
af_cache(3) Attribute Filesystem (AtFS) af_cache(3)NAME
af_savecache, af_cachesize - AtFS derived object cache handling
SYNOPSIS
#include <atfs.h>
int af_savecache (Af_key *busyAso, Af_key* cachedAso, char *attr, int mode)
int af_cachesize (char path, int totalMax, int maxPerName, int maxPerGivenAttr);
DESCRIPTION
af_savecache copies a busy attributed software object (busyAso) to a derived object cache. A key for the resulting cached ASO is returned
in the buffer cachedAso. Derived object caches are intended to hold derived objects that can be reproduced at any time. Reproducibility is
important, because cached ASOs may be deleted automatically due to storage limitations for derived object caches. A cache allows a certain
number of versions per name (see function af_cachesize described below) to be stored. When this number is reached, each time a new version
arrives, the oldest version (access date) gets cleaned out.
The strategy of cleaning out old versions when space is needed for new ones is influenced by the attr argument. When this is given af_save-
cache searches for cached versions (with the same name as the new one) carrying the given attribute. If it finds one or more such versions,
the oldest (access date) of them will be eliminated.
The mode argument may have one of the following values
AF_STORE_COMPLETE
(default) The cached file is stored unmodified.
AF_STORE_COMPRESSED
The cached file will be stored in a compressed format.
ASOs that are saved in derived object caches do not automatically get a version number. By means of af_svnum (manual page af_version(3))
you can attach any version number to an ASO stored in a derived object cache.
af_cachesize defines the size strategy of the cache in directory path. It sets the maximum cache size for the whole directory (totalMax),
the maximum number of versions per name (maxPerName), and the number of versions allowed simultaneously carrying the elimination attribute
(see before). A value less or equal zero given for any of the arguments of af_cachesize will cause this argument to be ignored.
DIAGNOSTICS
Upon error, -1 is returned and af_errno is set to the corresponding error number.
BUGS
Compression of cached files (mode AF_STORE_COMPRESSED) is not yet supported.
af_cachesize cannot shrink derived object caches yet. Values given must be greater or equal the prevoius size.
AtFS-1.71 Mon Jul 19 18:19:37 1993 af_cache(3)
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