Ns_UrlSpecific(3aolserver) AOLserver Library Procedures Ns_UrlSpecific(3aolserver)
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NAME
Ns_UrlSpecificAlloc, Ns_UrlSpecificDestroy, Ns_UrlSpecificGet, Ns_UrlSpecificGetExact, Ns_UrlSpecificGetFast, Ns_UrlSpecificSet - Store and
retrieve URL-specific data
SYNOPSIS
#include "ns.h"
int
Ns_UrlSpecificAlloc(void)
void *
Ns_UrlSpecificDestroy(char *server, char *method, char *url,
int id, int flags)
void *
Ns_UrlSpecificGet(char *server, char *method, char *url,
int id)
void *
Ns_UrlSpecificGetExact(char *server, char *method, char *url,
int id, int flags)
void *
Ns_UrlSpecificGetFast(char *server, char *method, char *url,
int id)
void
Ns_UrlSpecificSet(char *server, char *method, char *url,
int id, void *data, int flags, void (*deletefunc) (void *))
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DESCRIPTION
These functions allow you to store URL-specific data in memory for later retrieval. They are used when registering procedures for example.
Ns_UrlSpecificAlloc()
Return a unique ID used to identify a unique virtual URL-space that is then used with the Ns_UrlSpecific storage functions. You
should only call this function at server startup, and not after. Here is an example:
static int myId;
void
Init(void)
{
/* Allocate the id once at startup. */
myId = Ns_UrlSpecificAlloc();
}
void
Store(char *server, char *method, char *url, char *data)
{
Ns_UrlSpecificSet(server, method, url, myId,
data, 0, NULL);
}
char *
Fetch(char *server, char *method, char *url)
{
char *data;
data = Ns_UrlSpecificGet(server, method, url, myId);
return (char *) data;
}
Ns_UrlSpecificDestroy(server, method, url, id, flags)
The Ns_UrlSpecificDestroy function deletes URL-specific data previously stored with Ns_UrlSpecificSet with the same method/URL com-
bination and the same inheritance setting.
An id of -1 matches all ids. For example, Ns_UrlSpecificDestroy("myserver", "GET", "/", -1, NS_OP_RECURSE) removes all data for the
method GET for server "myserver".
The flags argument can be:
NS_OP_NODELETE - If set, the deletefunc specified in Ns_UrlSpeciciSet is run.
NS_OP_RECURSE - If set, then data for all URLs more specific than the passed-in URL are also destroyed.
NS_OP_NOINHERIT - If set, data that was stored with this flag in Ns_UrlSpecificSet will be deleted. If not set, the data stored
without this flag will be deleted.
Ns_UrlSpecificGet(server, method, url, id)
The Ns_UrlSpecificGet function retrieves the best match that it can find for in the URL subspace identified by id that the passed-in
URL matches. For instance, suppose you had previously registered a handle/method/url/id combination of {myserver, GET, /, 1} and
{myserver, GET, /inventory, 1}. The following call would match the data registered at {myserver, GET, /inventory, 1}:
Ns_UrlSpecificGet("myserver", "GET", "/inventory/RJ45", 1)
Ns_UrlSpecificGetExact(server, method, url, id, flags)
Retrieves stored data for the exact method/URL/id combination specified that was stored with the same inheritance setting.
If the flags argument is set to NS_OP_NOINHERIT, the data stored with NS_OP_NOINHERIT will be retrieved. If the flags argument is
set to 0, the data stored without NS_OP_NOINHERIT will be retrieved.
Ns_UrlSpecificGetFast(server, method, url, id)
Same as Ns_UrlSpecificGet but does not support wildcards, making it much faster.
Ns_UrlSpecificSet(server, method, url, id, data, flags, deletefunc)
The Ns_UrlSpecificSet function stores data in memory, allowing subsequent retrieval using handle, method, url, id, and inheritance
flag.
The flags argument can be NS_OP_NOINHERIT or NS_OP_NODELETE. You can store two sets of data based on the same handle, method, url,
and id combination-- one set with inheritance on and one set with inheritance off. If the NS_OP_NOINHERIT flag is set, the data is
stored based on the exact URL. If NS_OP_NOINHERIT is omitted, the data is stored based on the specified URL and any URL below it. In
this case, Ns_UrlSpecificGetExact will match to the closest URL when retrieving the data.
The deletefunc argument is called with data as an argument when this handle/url/method/id combination is re-registered or deleted,
or when this server shuts down. unless NS_OP_NODELETE is set.
Normally, calling Ns_UrlSpecificSet on a handle/url/method/id combination which already has an operation registered for it causes
the previous operation's delete procedure to be called. You can override this behavior by adding the NS_OP_NODELETE flag.
SEE ALSO
nsd(1), info(n)
KEYWORDS
AOLserver 4.0 Ns_UrlSpecific(3aolserver)