/* GStreamer
 * Copyright (C) 2008 Wim Taymans <wim.taymans at gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include <gst/gst.h>

#ifndef __GST_RTSP_SESSION_POOL_H__
#define __GST_RTSP_SESSION_POOL_H__

#include "rtsp-server-prelude.h"

G_BEGIN_DECLS

typedef struct _GstRTSPSessionPool GstRTSPSessionPool;
typedef struct _GstRTSPSessionPoolClass GstRTSPSessionPoolClass;
typedef struct _GstRTSPSessionPoolPrivate GstRTSPSessionPoolPrivate;

#include "rtsp-session.h"

#define GST_TYPE_RTSP_SESSION_POOL              (gst_rtsp_session_pool_get_type ())
#define GST_IS_RTSP_SESSION_POOL(obj)           (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_RTSP_SESSION_POOL))
#define GST_IS_RTSP_SESSION_POOL_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_RTSP_SESSION_POOL))
#define GST_RTSP_SESSION_POOL_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_RTSP_SESSION_POOL, GstRTSPSessionPoolClass))
#define GST_RTSP_SESSION_POOL(obj)              (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_RTSP_SESSION_POOL, GstRTSPSessionPool))
#define GST_RTSP_SESSION_POOL_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_RTSP_SESSION_POOL, GstRTSPSessionPoolClass))
#define GST_RTSP_SESSION_POOL_CAST(obj)         ((GstRTSPSessionPool*)(obj))
#define GST_RTSP_SESSION_POOL_CLASS_CAST(klass) ((GstRTSPSessionPoolClass*)(klass))

/**
 * GstRTSPSessionPool:
 *
 * An object that keeps track of the active sessions. This object is usually
 * attached to a #GstRTSPServer object to manage the sessions in that server.
 */
struct _GstRTSPSessionPool {
  GObject       parent;

  /*< private >*/
  GstRTSPSessionPoolPrivate *priv;
  gpointer _gst_reserved[GST_PADDING];
};

/**
 * GstRTSPSessionPoolClass:
 * @create_session_id: create a new random session id. Subclasses can create
 *    custom session ids and should not check if the session exists.
 * @create_session: make a new session object.
 * @session_removed: a session was removed from the pool
 */
struct _GstRTSPSessionPoolClass {
  GObjectClass  parent_class;

  gchar *          (*create_session_id)   (GstRTSPSessionPool *pool);
  GstRTSPSession * (*create_session)      (GstRTSPSessionPool *pool, const gchar *id);

  /* signals */
  void             (*session_removed)     (GstRTSPSessionPool *pool,
                                           GstRTSPSession *session);

  /*< private >*/
  gpointer _gst_reserved[GST_PADDING_LARGE - 1];
};

/**
 * GstRTSPSessionPoolFunc:
 * @pool: a #GstRTSPSessionPool object
 * @user_data: user data that has been given when registering the handler
 *
 * The function that will be called from the GSource watch on the session pool.
 *
 * The function will be called when the pool must be cleaned up because one or
 * more sessions timed out.
 *
 * Returns: %FALSE if the source should be removed.
 */
typedef gboolean (*GstRTSPSessionPoolFunc)  (GstRTSPSessionPool *pool, gpointer user_data);

/**
 * GstRTSPSessionPoolFilterFunc:
 * @pool: a #GstRTSPSessionPool object
 * @session: a #GstRTSPSession in @pool
 * @user_data: user data that has been given to gst_rtsp_session_pool_filter()
 *
 * This function will be called by the gst_rtsp_session_pool_filter(). An
 * implementation should return a value of #GstRTSPFilterResult.
 *
 * When this function returns #GST_RTSP_FILTER_REMOVE, @session will be removed
 * from @pool.
 *
 * A return value of #GST_RTSP_FILTER_KEEP will leave @session untouched in
 * @pool.
 *
 * A value of GST_RTSP_FILTER_REF will add @session to the result #GList of
 * gst_rtsp_session_pool_filter().
 *
 * Returns: a #GstRTSPFilterResult.
 */
typedef GstRTSPFilterResult (*GstRTSPSessionPoolFilterFunc)  (GstRTSPSessionPool *pool,
                                                              GstRTSPSession *session,
                                                              gpointer user_data);


GST_RTSP_SERVER_API
GType                 gst_rtsp_session_pool_get_type          (void);

/* creating a session pool */

GST_RTSP_SERVER_API
GstRTSPSessionPool *  gst_rtsp_session_pool_new               (void) G_GNUC_WARN_UNUSED_RESULT;

/* counting sessions */

GST_RTSP_SERVER_API
void                  gst_rtsp_session_pool_set_max_sessions  (GstRTSPSessionPool *pool, guint max);

GST_RTSP_SERVER_API
guint                 gst_rtsp_session_pool_get_max_sessions  (GstRTSPSessionPool *pool);

GST_RTSP_SERVER_API
guint                 gst_rtsp_session_pool_get_n_sessions    (GstRTSPSessionPool *pool);

/* managing sessions */

GST_RTSP_SERVER_API
GstRTSPSession *      gst_rtsp_session_pool_create            (GstRTSPSessionPool *pool) G_GNUC_WARN_UNUSED_RESULT;

GST_RTSP_SERVER_API
GstRTSPSession *      gst_rtsp_session_pool_find              (GstRTSPSessionPool *pool,
                                                               const gchar *sessionid) G_GNUC_WARN_UNUSED_RESULT;

GST_RTSP_SERVER_API
gboolean              gst_rtsp_session_pool_remove            (GstRTSPSessionPool *pool,
                                                               GstRTSPSession *sess);

/* perform session maintenance */

GST_RTSP_SERVER_API
GList *               gst_rtsp_session_pool_filter            (GstRTSPSessionPool *pool,
                                                               GstRTSPSessionPoolFilterFunc func,
                                                               gpointer user_data) G_GNUC_WARN_UNUSED_RESULT;

GST_RTSP_SERVER_API
guint                 gst_rtsp_session_pool_cleanup           (GstRTSPSessionPool *pool);

GST_RTSP_SERVER_API
GSource *             gst_rtsp_session_pool_create_watch      (GstRTSPSessionPool *pool) G_GNUC_WARN_UNUSED_RESULT;

#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstRTSPSessionPool, gst_object_unref)
#endif

G_END_DECLS

#endif /* __GST_RTSP_SESSION_POOL_H__ */