rserpool/lib/msgDirector.c

/*	$Header: /usr/sctpCVS/rserpool/lib/msgDirector.c,v 1.1 2006-05-30 18:02:02 randall Exp $ */

/*
 * Copyright (C) 2002 Cisco Systems Inc,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <msgDirector.h>
/*
 * You provide a function that looks as follows.
 * Your function will be called with the specific
 * object looked up by the query function. The 
 * query function has access to the hash table stored
 * with this object.
 */
void
distribMessage(void *obj, messageEnvolope *msg)
{
  void *passObj;
  messageDir *dir;
  dir = (messageDir *)obj;
  passObj = (*dir->query)(dir->objinfo,msg,dir->hash);
  if(passObj == NULL)
    /* no one to handle the message */
    return;
  /* we have a live one :), pass it off */
  (*dir->mf)(passObj,msg);
}

/* 
 * Creation and registration.
 */

messageDir *
messageDir_create(distributor *o,
		  void *objinfo, 
		  messageFunc mf, 
		  messageQuery qry,
		  int priority)
{
  int x;
  messageDir *ret;
  ret = calloc(1,sizeof(messageDir));
  if(ret == NULL)
    return(ret);
  ret->hash = HashedTbl_create("msgD tb",26);
  if(ret->hash == NULL){
    free(ret);
    return(NULL);
  }
  ret->obj = o;
  ret->objinfo = objinfo;
  ret->mf = mf;
  ret->query = qry;
  /* now register for messages */
  x = dist_msgSubscribe(o,distribMessage,
			DIST_SCTP_PROTO_ID_DEFAULT,
			DIST_STREAM_DEFAULT,priority,
			(void *)ret);
  if(x < LIB_STATUS_GOOD){
    /* error, we can't register? */
    HashedTbl_destroy(ret->hash);
    free(ret);
    return(NULL);
  }
  return(ret);
}

/* 
 * Destructor function.
 */
int
messageDir_destroy(messageDir *dir)
{
  dist_msgUnsubscribe(dir->obj,
		    distribMessage,
		    DIST_SCTP_PROTO_ID_DEFAULT,
		    DIST_STREAM_DEFAULT,
		    (void *)dir);
  HashedTbl_destroy(dir->hash);
  free(dir);
  return(LIB_STATUS_GOOD);
}