transmission/libtransmission/publish.c

/*
 * This file Copyright (C) 2007-2008 Charles Kerr <charles@rebelbase.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;
};

struct tr_publisher_s
{
    tr_list *  list;
};

tr_publisher_t*
tr_publisherNew( void )
{
    return tr_new0( tr_publisher_t, 1 );
}

void
tr_publisherFree( tr_publisher_t ** p )
{
    assert( p );
    assert( *p );

    tr_list_free( &( *p )->list, NULL );
    tr_free( *p );
    *p = NULL;
}

tr_publisher_tag
tr_publisherSubscribe( tr_publisher_t * 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_t * p,
                         tr_publisher_tag tag )
{
    tr_list_remove_data( &p->list, tag );
    tr_free( tag );
}

void
tr_publisherPublish( tr_publisher_t * 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;
    }
}