1998-10-25 09:41:42 +08:00
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.TH LDAP_CACHE 3 "22 September 1998" "OpenLDAP LDVERSION"
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1998-08-09 08:43:13 +08:00
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.SH NAME
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ldap_enable_cache, ldap_disable_cache, ldap_destroy_cache, ldap_flush_cache, ldap_uncache_entry, ldap_uncache_request, ldap_set_cache_options \- LDAP client caching routines
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.SH SYNOPSIS
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.nf
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.ft B
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#include <lber.h>
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#include <ldap.h>
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.ft
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.LP
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.ft B
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ldap_enable_cache( ld, timeout, maxmem )
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.ft
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LDAP *ld;
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long timeout;
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long maxmem;
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.LP
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.ft B
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void ldap_disable_cache( ld )
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.ft
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LDAP *ld;
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.LP
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.ft B
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void ldap_destroy_cache( ld )
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.ft
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LDAP *ld;
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.LP
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.ft B
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void ldap_flush_cache( ld )
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.ft
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LDAP *ld;
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.LP
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.ft B
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void ldap_uncache_entry( ld, dn )
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.ft
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LDAP *ld;
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char *dn;
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.LP
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.ft B
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void ldap_uncache_request( ld, msgid )
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.ft
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LDAP *ld;
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int msgid;
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.LP
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.ft B
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void ldap_set_cache_options( ld, opts )
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.ft
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LDAP *ld;
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unsigned long opts;
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.fi
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.SH DESCRIPTION
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.LP
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These routines are used to control the behavior of client caching of
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.BR ldap_search (3),
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.BR cldap_search_s (3),
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and
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.BR ldap_compare (3)
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operations. By
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default, the cache is disabled and no caching is done. Enabling the
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cache can greatly improve performance and reduce network bandwidth when
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a client DUA makes repeated requests.
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.LP
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.B ldap_enable_cache()
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should be called to turn on local caching or to
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change cache parameters (lifetime of cached requests and memory used).
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The \fIld\fP parameter should be the result of a successful call to
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.BR ldap_open (3).
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The \fItimeout\fP is specified in seconds, and is used to
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decide how long to keep cached requests. The \fImaxmem\fP value is in
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bytes, and is used to set an upper bound on how memory the cache will
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use. You can specify 0 for \fImaxmem\fP to restrict the cache size by
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the \fItimeout\fP only. The first call to ldap_enable_cache creates
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the cache; subsequent calls re-enable the cache and set the timeout and
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memory values.
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.LP
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.B ldap_disable_cache()
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temporarily disables use of the cache (new
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requests are not cached and the cache is not checked when returning
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results). It does not delete the cache contents.
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.LP
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.B ldap_destroy_cache()
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turns off caching and completely removes the cache from memory.
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.LP
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.B ldap_flush_cache()
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deletes the cache contents, but does not effect it in any other way.
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.LP
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.B ldap_uncache_entry()
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removes all requests that make reference to the
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distinguished name \fIdn\fP from the cache. It should be used, for
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example, after doing an
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.BR ldap_modify (3)
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call involving \fIdn\fP.
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.LP
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.B ldap_uncache_request()
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removes the request indicated by the LDAP request
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id \fImsgid\fP from the cache.
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.LP
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.B ldap_set_cache_options()
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is used to change caching behavior. The current supported options are
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.B LDAP_CACHE_OPT_CACHENOERRS
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to suppress caching of any requests that result in an error, and
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.B LDAP_CACHE_OPT_CACHEALLERRS
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to enable caching of all requests. The default behavior is to not
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cache requests that result in errors, except that request that result
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in the error
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.B LDAP_SIZELIMIT_EXCEEDED
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are cached.
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.SH ERRORS
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.B ldap_enable_cache()
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returns 0 upon success, and -1 if it is unable to
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allocate space for the cache. All the other calls are declared as
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void and return nothing.
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.SH SEE ALSO
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.BR ldap (3),
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.BR ldap_search (3),
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.BR ldap_compare (3),
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.BR cldap_search_s (3)
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1998-10-25 09:41:42 +08:00
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.SH ACKNOWLEDGEMENTS
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.B OpenLDAP
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is developed and maintained by The OpenLDAP Project (http://www.openldap.org/).
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.B OpenLDAP
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is derived from University of Michigan LDAP 3.3 Release.
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