+++ /dev/null
-/**
- * \file mlt_events.c
- * \brief event handling
- * \see mlt_events_struct
- *
- * Copyright (C) 2004-2009 Ushodaya Enterprises Limited
- * \author Charles Yates <charles.yates@pandora.be>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <pthread.h>
-
-#include "mlt_properties.h"
-#include "mlt_events.h"
-
-/* Memory leak checks. */
-
-#undef _MLT_EVENT_CHECKS_
-
-#ifdef _MLT_EVENT_CHECKS_
-static int events_created = 0;
-static int events_destroyed = 0;
-#endif
-
-/** \brief Events class
- *
- * Events provide messages and notifications between services and the application.
- * A service can register an event and fire/send it upon certain conditions or times.
- * Likewise, a service or an application can listen/receive specific events on specific
- * services.
- */
-
-struct mlt_events_struct
-{
- mlt_properties owner;
- mlt_properties list;
-};
-
-typedef struct mlt_events_struct *mlt_events;
-
-/** \brief Event class
- *
- */
-
-struct mlt_event_struct
-{
- mlt_events owner;
- int ref_count;
- int block_count;
- mlt_listener listener;
- void *service;
-};
-
-/** Increment the reference count on this event.
- *
- * \public \memberof mlt_event_struct
- * \param this an event
- */
-
-void mlt_event_inc_ref( mlt_event this )
-{
- if ( this != NULL )
- this->ref_count ++;
-}
-
-/** Increment the block count on this event.
- *
- * \public \memberof mlt_event_struct
- * \param this an event
- */
-
-void mlt_event_block( mlt_event this )
-{
- if ( this != NULL && this->owner != NULL )
- this->block_count ++;
-}
-
-/** Decrement the block count on this event.
- *
- * \public \memberof mlt_event_struct
- * \param this an event
- */
-
-void mlt_event_unblock( mlt_event this )
-{
- if ( this != NULL && this->owner != NULL )
- this->block_count --;
-}
-
-/** Close this event.
- *
- * \public \memberof mlt_event_struct
- * \param this an event
- */
-
-void mlt_event_close( mlt_event this )
-{
- if ( this != NULL )
- {
- if ( -- this->ref_count == 1 )
- this->owner = NULL;
- if ( this->ref_count <= 0 )
- {
-#ifdef _MLT_EVENT_CHECKS_
- mlt_log( NULL, MLT_LOG_DEBUG, "Events created %d, destroyed %d\n", events_created, ++events_destroyed );
-#endif
- free( this );
- }
- }
-}
-
-/* Forward declaration to private functions.
-*/
-
-static mlt_events mlt_events_fetch( mlt_properties );
-static void mlt_events_store( mlt_properties, mlt_events );
-static void mlt_events_close( mlt_events );
-
-/** Initialise the events structure.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- */
-
-void mlt_events_init( mlt_properties this )
-{
- mlt_events events = mlt_events_fetch( this );
- if ( events == NULL )
- {
- events = malloc( sizeof( struct mlt_events_struct ) );
- events->list = mlt_properties_new( );
- mlt_events_store( this, events );
- }
-}
-
-/** Register an event and transmitter.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param id the name of an event
- * \param transmitter the callback function to send an event message
- * \return true if there was an error
- */
-
-int mlt_events_register( mlt_properties this, const char *id, mlt_transmitter transmitter )
-{
- int error = 1;
- mlt_events events = mlt_events_fetch( this );
- if ( events != NULL )
- {
- mlt_properties list = events->list;
- char temp[ 128 ];
- error = mlt_properties_set_data( list, id, transmitter, 0, NULL, NULL );
- sprintf( temp, "list:%s", id );
- if ( mlt_properties_get_data( list, temp, NULL ) == NULL )
- mlt_properties_set_data( list, temp, mlt_properties_new( ), 0, ( mlt_destructor )mlt_properties_close, NULL );
- }
- return error;
-}
-
-/** Fire an event.
- *
- * This takes a variable number of arguments to supply to the listener.
-
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param id the name of an event
- */
-
-void mlt_events_fire( mlt_properties this, const char *id, ... )
-{
- mlt_events events = mlt_events_fetch( this );
- if ( events != NULL )
- {
- int i = 0;
- va_list alist;
- void *args[ 10 ];
- mlt_properties list = events->list;
- mlt_properties listeners = NULL;
- char temp[ 128 ];
- mlt_transmitter transmitter = mlt_properties_get_data( list, id, NULL );
- sprintf( temp, "list:%s", id );
- listeners = mlt_properties_get_data( list, temp, NULL );
-
- va_start( alist, id );
- do
- args[ i ] = va_arg( alist, void * );
- while( args[ i ++ ] != NULL );
- va_end( alist );
-
- if ( listeners != NULL )
- {
- for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
- {
- mlt_event event = mlt_properties_get_data_at( listeners, i, NULL );
- if ( event != NULL && event->owner != NULL && event->block_count == 0 )
- {
- if ( transmitter != NULL )
- transmitter( event->listener, event->owner, event->service, args );
- else
- event->listener( event->owner, event->service );
- }
- }
- }
- }
-}
-
-/** Register a listener.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param service an opaque pointer
- * \param id the name of the event to listen for
- * \param listener the callback to receive an event message
- * \return
- */
-
-mlt_event mlt_events_listen( mlt_properties this, void *service, const char *id, mlt_listener listener )
-{
- mlt_event event = NULL;
- mlt_events events = mlt_events_fetch( this );
- if ( events != NULL )
- {
- mlt_properties list = events->list;
- mlt_properties listeners = NULL;
- char temp[ 128 ];
- sprintf( temp, "list:%s", id );
- listeners = mlt_properties_get_data( list, temp, NULL );
- if ( listeners != NULL )
- {
- int first_null = -1;
- int i = 0;
- for ( i = 0; event == NULL && i < mlt_properties_count( listeners ); i ++ )
- {
- mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
- if ( entry != NULL && entry->owner != NULL )
- {
- if ( entry->service == service && entry->listener == listener )
- event = entry;
- }
- else if ( ( entry == NULL || entry->owner == NULL ) && first_null == -1 )
- {
- first_null = i;
- }
- }
-
- if ( event == NULL )
- {
- event = malloc( sizeof( struct mlt_event_struct ) );
- if ( event != NULL )
- {
-#ifdef _MLT_EVENT_CHECKS_
- events_created ++;
-#endif
- sprintf( temp, "%d", first_null == -1 ? mlt_properties_count( listeners ) : first_null );
- event->owner = events;
- event->ref_count = 0;
- event->block_count = 0;
- event->listener = listener;
- event->service = service;
- mlt_properties_set_data( listeners, temp, event, 0, ( mlt_destructor )mlt_event_close, NULL );
- mlt_event_inc_ref( event );
- }
- }
-
- }
- }
- return event;
-}
-
-/** Block all events for a given service.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param service an opaque pointer
- */
-
-void mlt_events_block( mlt_properties this, void *service )
-{
- mlt_events events = mlt_events_fetch( this );
- if ( events != NULL )
- {
- int i = 0, j = 0;
- mlt_properties list = events->list;
- for ( j = 0; j < mlt_properties_count( list ); j ++ )
- {
- char *temp = mlt_properties_get_name( list, j );
- if ( !strncmp( temp, "list:", 5 ) )
- {
- mlt_properties listeners = mlt_properties_get_data( list, temp, NULL );
- for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
- {
- mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
- if ( entry != NULL && entry->service == service )
- mlt_event_block( entry );
- }
- }
- }
- }
-}
-
-/** Unblock all events for a given service.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param service an opaque pointer
- */
-
-void mlt_events_unblock( mlt_properties this, void *service )
-{
- mlt_events events = mlt_events_fetch( this );
- if ( events != NULL )
- {
- int i = 0, j = 0;
- mlt_properties list = events->list;
- for ( j = 0; j < mlt_properties_count( list ); j ++ )
- {
- char *temp = mlt_properties_get_name( list, j );
- if ( !strncmp( temp, "list:", 5 ) )
- {
- mlt_properties listeners = mlt_properties_get_data( list, temp, NULL );
- for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
- {
- mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
- if ( entry != NULL && entry->service == service )
- mlt_event_unblock( entry );
- }
- }
- }
- }
-}
-
-/** Disconnect all events for a given service.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param service an opaque pointer
- */
-
-void mlt_events_disconnect( mlt_properties this, void *service )
-{
- mlt_events events = mlt_events_fetch( this );
- if ( events != NULL )
- {
- int i = 0, j = 0;
- mlt_properties list = events->list;
- for ( j = 0; j < mlt_properties_count( list ); j ++ )
- {
- char *temp = mlt_properties_get_name( list, j );
- if ( !strncmp( temp, "list:", 5 ) )
- {
- mlt_properties listeners = mlt_properties_get_data( list, temp, NULL );
- for ( i = 0; i < mlt_properties_count( listeners ); i ++ )
- {
- mlt_event entry = mlt_properties_get_data_at( listeners, i, NULL );
- char *name = mlt_properties_get_name( listeners, i );
- if ( entry != NULL && entry->service == service )
- mlt_properties_set_data( listeners, name, NULL, 0, NULL, NULL );
- }
- }
- }
- }
-}
-
-/** \brief private to mlt_events_struct, used by mlt_events_wait_for() */
-
-typedef struct
-{
- int done;
- pthread_cond_t cond;
- pthread_mutex_t mutex;
-}
-condition_pair;
-
-/** The event listener callback for the wait functions.
- *
- * \private \memberof mlt_events_struct
- * \param this a properties list
- * \param pair a condition pair
- */
-
-static void mlt_events_listen_for( mlt_properties this, condition_pair *pair )
-{
- pthread_mutex_lock( &pair->mutex );
- if ( pair->done == 0 )
- {
- pthread_cond_signal( &pair->cond );
- pthread_mutex_unlock( &pair->mutex );
- }
-}
-
-/** Prepare to wait for an event.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param id the name of the event to wait for
- * \return an event
- */
-
-mlt_event mlt_events_setup_wait_for( mlt_properties this, const char *id )
-{
- condition_pair *pair = malloc( sizeof( condition_pair ) );
- pair->done = 0;
- pthread_cond_init( &pair->cond, NULL );
- pthread_mutex_init( &pair->mutex, NULL );
- pthread_mutex_lock( &pair->mutex );
- return mlt_events_listen( this, pair, id, ( mlt_listener )mlt_events_listen_for );
-}
-
-/** Wait for an event.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param event an event
- */
-
-void mlt_events_wait_for( mlt_properties this, mlt_event event )
-{
- if ( event != NULL )
- {
- condition_pair *pair = event->service;
- pthread_cond_wait( &pair->cond, &pair->mutex );
- }
-}
-
-/** Cleanup after waiting for an event.
- *
- * \public \memberof mlt_events_struct
- * \param this a properties list
- * \param event an event
- */
-
-void mlt_events_close_wait_for( mlt_properties this, mlt_event event )
-{
- if ( event != NULL )
- {
- condition_pair *pair = event->service;
- event->owner = NULL;
- pair->done = 0;
- pthread_mutex_unlock( &pair->mutex );
- pthread_mutex_destroy( &pair->mutex );
- pthread_cond_destroy( &pair->cond );
- }
-}
-
-/** Fetch the events object.
- *
- * \private \memberof mlt_events_struct
- * \param this a properties list
- * \return an events object
- */
-
-static mlt_events mlt_events_fetch( mlt_properties this )
-{
- mlt_events events = NULL;
- if ( this != NULL )
- events = mlt_properties_get_data( this, "_events", NULL );
- return events;
-}
-
-/** Store the events object.
- *
- * \private \memberof mlt_events_struct
- * \param this a properties list
- * \param events an events object
- */
-
-static void mlt_events_store( mlt_properties this, mlt_events events )
-{
- if ( this != NULL && events != NULL )
- mlt_properties_set_data( this, "_events", events, 0, ( mlt_destructor )mlt_events_close, NULL );
-}
-
-/** Close the events object.
- *
- * \private \memberof mlt_events_struct
- * \param events an events object
- */
-
-static void mlt_events_close( mlt_events events )
-{
- if ( events != NULL )
- {
- mlt_properties_close( events->list );
- free( events );
- }
-}
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