'\" te
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.TH ldap_memcache 3LDAP "6 Jan 2003" "SunOS 5.11" "LDAP Library Functions"
.SH NAME
ldap_memcache, ldap_memcache_init, ldap_memcache_set, ldap_memcache_get,
ldap_memcache_flush, ldap_memcache_destroy, ldap_memcache_update \- LDAP client
caching functions
.SH SYNOPSIS
.LP
.nf
\fBcc\fR \fB-flag \&.\|.\|.\fR \fIfile\fR\&.\|.\|.\fB-l\fRldap [\fB -library \&.\|.\|. \fR] 
#include <ldap.h>

\fBint\fR \fBldap_memcache_init\fR(\fBunsigned long\fR \fIttl\fR, \fBunsigned long\fR \fIsize\fR,
     \fBchar **\fR\fIbaseDNs\fR,\fBstruct ldap_thread_fns *\fR\fIthread_fns\fR,
     \fBLDAPMemCache **\fR\fIcachep\fR
.fi

.LP
.nf
\fBint\fR \fBldap_memcache_set\fR(\fBLDAP *\fR\fIld\fR, \fBLDAPMemCache **\fR\fIcache\fR
.fi

.LP
.nf
\fBint\fR \fBldap_memcache_get\fR(\fBLDAP *\fR\fIld\fR, \fBLDAPMemCache **\fR\fIcachep\fR
.fi

.LP
.nf
\fBvoid\fR \fBldap_memcache_flush\fR(\fBLDAPMemCache *\fR\fIcache\fR, \fBchar *\fR\fIdn\fR, \fBint\fR \fIscope\fR
.fi

.LP
.nf
\fBvoid\fR \fBldap_memcache_destroy\fR(\fBLDAPMemCache *\fR\fIcache\fR
.fi

.LP
.nf
\fBvoid\fR \fBldap_memcache_update\fR(\fBLDAPMemCache *\fR\fIcache\fR
.fi

.SH DESCRIPTION
.sp
.LP
Use the \fBldap_memcache\fR functions to maintain an in-memory client side
cache to store search requests. Caching improves performance and reduces
network bandwidth when a client makes repeated requests. The \fIcache\fR uses
search criteria as the key to the cached items. When you send a search request,
the \fIcache\fR checks the search criteria to determine if that request has
been previously stored . If the request was stored, the search results are read
from the \fIcache\fR.
.sp
.LP
Make a call to \fBldap_memcache_init()\fR to create the in-memory client side
\fIcache\fR. The function passes back a pointer to an \fBLDAPMemCache\fR
structure, which represents the \fIcache\fR. Make a call to the
\fBldap_memcache_set()\fR function to associate this \fIcache\fR with an LDAP
connection handle, an LDAP structure. \fIttl\fR is the the maximum  amount of
time (in seconds) that an item can be cached. If a \fIttl\fR value  of 0 is
passed, there is no limit to the amount of time that an item  can be cached.
\fIsize\fR is the maximum amount of memory (in bytes) that the cache will
consume. A zero value of \fIsize\fR means the cache has  no size limit.
\fIbaseDNS\fR is an array of the base DN strings representing  the base DNs of
the search requests you want cached. If \fIbaseDNS\fR is not \fINULL\fR, only
the search requests with the specified base DNs will be cached. If
\fIbaseDNS\fR is \fINULL\fR,  all search requests are cached. The
\fIthread_fns\fR parameter takes an \fBldap_thread_fns structure\fR specifying
the functions that you want used to ensure that the cache is thread-safe. You
should specify this if you have multiple threads that are using the same
connection handle and cache. If you are not using multiple threads, pass
\fINULL\fR for this parameter.
.sp
.LP
\fBldap_memcache_set()\fR associates an in-memory \fIcache\fR that you have
already  created by calling the \fBldap_memcache_init()\fR function with an
LDAP connection handle. The \fIld\fR parameter should be the result of a
successful call to \fBldap_open\fR(3LDAP). The \fIcache\fR parameter should be
the result  of a \fIcache\fR created by the \fBldap_memcache_init()\fR call.
After you call this function, search requests made over the specified LDAP
connection will use this cache. To disassociate the cache from the LDAP
connection handle, make a call to the \fBldap_bind\fR(3LDAP) or
\fBldap_bind\fR(3LDAP) function. Make a call to \fBldap_memcache_set()\fR if
you want to associate  a cache with multiple LDAP connection handles. For
example, call  the \fBldap_memcache_get()\fR function to get the \fIcache\fR
associated with one connection, then you can call this function and associate
the \fIcache\fR with another connection.
.sp
.LP
The \fBldap_memcache_get()\fR function gets the \fIcache\fR associated with the
specified connection handle (LDAP structure). This \fIcache\fR is used by all
search  requests made through that connection. When you call this function, the
function sets the \fIcachep\fR parameter as a pointer to the \fBLDAPMemCache\fR
structure that is associated with the connection handle.
.sp
.LP
\fBldap_memcache_flush()\fR flushes search requests from the \fIcache\fR. If
the base DN of a search request is within the scope specified by the \fIdn\fR
and \fIscope\fR arguments, the search request is flushed from the \fIcache\fR.
If no DN is specified, the entire cache is flushed. The \fIscope\fR parameter,
along with the \fIdn\fR parameter, identifies the search requests that you want
flushed from the \fIcache\fR. This argument can have one of the following
values:
.br
.in +2
\fBLDAP_SCOPE_BASE\fR
.in -2
.br
.in +2
\fBLDAP_SCOPE_ONELEVEL\fR
.in -2
.br
.in +2
\fBLDAP_SCOPE_SUBTREE\fR
.in -2
.sp
.LP
\fBldap_memcache_destroy()\fR frees the specified \fBLDAPMemCache\fR structure
pointed to by \fIcache\fR from memory. Call this function after you are done
working with a \fIcache\fR.
.sp
.LP
\fBldap_memcache_update()\fR checks the cache for items that have expired  and
removes them. This check is typically done as part of the way the \fIcache\fR
normally works. You do not need to call this function unless you  want to
update the \fIcache\fR at this point in time. This function is only  useful in
a multithreaded application, since it will not return until the \fIcache\fR is
destroyed.
.SH PARAMETERS
.sp
.ne 2
.mk
.na
\fB\fIttl\fR\fR
.ad
.RS 14n
.rt  
The maximum amount of time (in seconds) that an item can be cached
.RE

.sp
.ne 2
.mk
.na
\fB\fIsize\fR\fR
.ad
.RS 14n
.rt  
The maximum amount of memory (in bytes)  that the cache will consume.
.RE

.sp
.ne 2
.mk
.na
\fB\fIbaseDNs\fR\fR
.ad
.RS 14n
.rt  
An array of the base DN strings representing  the base DNs of the search
requests you want cached
.RE

.sp
.ne 2
.mk
.na
\fB\fIthread_fns\fR\fR
.ad
.RS 14n
.rt  
A pointer to the \fBldap_thread_fns structure\fR structure.
.RE

.sp
.ne 2
.mk
.na
\fB\fIcachep\fR\fR
.ad
.RS 14n
.rt  
A pointer to the \fBLDAPMemCache\fR structure
.RE

.sp
.ne 2
.mk
.na
\fB\fIcache\fR\fR
.ad
.RS 14n
.rt  
The result of a \fIcache\fR created by the \fBldap_memcache_init()\fR call
.RE

.sp
.ne 2
.mk
.na
\fB\fIld\fR\fR
.ad
.RS 14n
.rt  
The result of a successful call to \fBldap_open\fR(3LDAP)
.RE

.sp
.ne 2
.mk
.na
\fB\fIdn\fR\fR
.ad
.RS 14n
.rt  
The search requests that you want flushed from the \fIcache\fR
.RE

.sp
.ne 2
.mk
.na
\fB\fIscope\fR\fR
.ad
.RS 14n
.rt  
The search requests that you want flushed from the \fIcache\fR
.RE

.SH ERRORS
.sp
.LP
The functions that have \fBint\fR return values return \fBLDAP_SUCCESS\fR if
the operation was successful. Otherwise, they return another LDAP error code.
See \fBldap_error\fR(3LDAP) for a list of the LDAP error codes.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityEvolving
.TE

.SH SEE ALSO
.sp
.LP
\fBldap_error\fR(3LDAP), \fBldap_open\fR(3LDAP), \fBldap_search\fR(3LDAP),
\fBattributes\fR(5)