/*
 * This file Copyright (C) 2007-2009 Charles Kerr <charles@transmissionbt.com>
 *
 * This file is licensed by the GPL version 2.  Works owned by the
 * Transmission project are granted a special exemption to clause 2(b)
 * so that the bulk of its code can remain under the MIT license.
 * This exemption does not extend to derived works not owned by
 * the Transmission project.
 *
 * $Id$
 */

#include <assert.h>
#include "list.h"
#include "publish.h"
#include "utils.h"

struct tr_publisher_node
{
    tr_delivery_func *  func;
    void *              user_data;
};

const tr_publisher TR_PUBLISHER_INIT = { NULL };

void
tr_publisherDestruct( tr_publisher * p )
{
    tr_list_free( &p->list, NULL );
}

tr_publisher_tag
tr_publisherSubscribe( tr_publisher     * p,
                       tr_delivery_func   func,
                       void *             user_data )
{
    struct tr_publisher_node * node = tr_new( struct tr_publisher_node, 1 );

    node->func = func;
    node->user_data = user_data;
    tr_list_append( &p->list, node );
    return node;
}

void
tr_publisherUnsubscribe( tr_publisher * p,
                         tr_publisher_tag tag )
{
    tr_list_remove_data( &p->list, tag );
    tr_free( tag );
}

void
tr_publisherPublish( tr_publisher * p,
                     void *           source,
                     void *           event )
{
    tr_list * walk;

    for( walk = p->list; walk != NULL; )
    {
        tr_list *                  next = walk->next;
        struct tr_publisher_node * node =
            (struct tr_publisher_node*)walk->data;
        ( node->func )( source, event, node->user_data );
        walk = next;
    }
}