observable.c
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/* GNU mailutils - a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Library Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <mailutils/iterator.h>
#include <mailutils/error.h>
#include <mailutils/sys/observable.h>
struct observer_info
{
int type;
observer_t observer;
};
int
observable_create (observable_t *pobservable)
{
observable_t observable;
int status;
if (pobservable == NULL)
return MU_ERROR_INVALID_PARAMETER;
observable = calloc (sizeof (*observable), 1);
if (observable == NULL)
return MU_ERROR_NO_MEMORY;
status = mu_list_create (&(observable->list));
if (status != 0 )
{
free (observable);
return status;
}
*pobservable = observable;
return 0;
}
int
observable_release (observable_t observable)
{
(void)observable;
return 1;
}
int
observable_destroy (observable_t observable)
{
if (observable)
{
iterator_t iterator = NULL;
int status = mu_list_get_iterator (observable->list, &iterator);
if (status == 0)
{
struct observer_info *info;
for (iterator_first (iterator); !iterator_is_done (iterator);
iterator_next (iterator))
{
info = NULL;
iterator_current (iterator, (void **)&info);
if (info)
{
observer_release (info->observer);
free (info);
}
}
iterator_release (iterator);
}
mu_list_destroy (observable->list);
free (observable);
}
return 0;
}
int
observable_attach (observable_t observable, int type, observer_t observer)
{
struct observer_info *info;
if (observable == NULL || observer == NULL)
return MU_ERROR_INVALID_PARAMETER;
info = calloc (1, sizeof *info);
if (info == NULL)
return MU_ERROR_NO_MEMORY;
info->type = type;
info->observer = observer;
return mu_list_append (observable->list, info);
}
int
observable_detach (observable_t observable, observer_t observer)
{
iterator_t iterator = NULL;
int status;
int found = 0;
struct observer_info *info;
if (observable == NULL ||observer == NULL)
return EINVAL;
status = mu_list_get_iterator (observable->list, &iterator);
if (status != 0)
return status;
for (iterator_first (iterator); !iterator_is_done (iterator);
iterator_next (iterator))
{
info = NULL;
iterator_current (iterator, (void **)&info);
if (info && (int)(info->observer) == (int)observer)
{
found = 1;
break;
}
}
iterator_release (iterator);
if (found)
{
status = mu_list_remove (observable->list, info);
free (info);
}
return status;
}
int
observable_notify_all (observable_t observable, struct event evt)
{
iterator_t iterator;
struct observer_info *info;
int status = 0;
if (observable == NULL)
return MU_ERROR_INVALID_PARAMETER;
status = mu_list_get_iterator (observable->list, &iterator);
if (status != 0)
return status;
for (iterator_first (iterator); !iterator_is_done (iterator);
iterator_next (iterator))
{
info = NULL;
iterator_current (iterator, (void **)&info);
if (info && info->type & evt.type)
{
status |= observer_action (info->observer, evt);
}
}
iterator_release (iterator);
return status;
}