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/* vim: set et ts=8 sw=8: */
/* gclue-min-uint.c
*
* Copyright 2018 Collabora Ltd.
*
* Geoclue is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* Geoclue 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with Geoclue; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author: Zeeshan Ali (Khattak) <zeeshanak@gnome.org>
*/
#include "gclue-min-uint.h"
/**
* SECTION:gclue-min-uint
* @short_description: Easy way to keep track of minimum of a bunch of values
* @include: gclue-glib/gclue-location-source.h
*
* This is a helper class that keeps a list of guint values and the minimum
* value from this list. It is used by location sources to use the minimum
* time-threshold (location update rate) from all the time-thresholds requested
* by different applications.
**/
struct _GClueMinUINTPrivate
{
GHashTable *all_values;
gboolean notify_value;
};
G_DEFINE_TYPE_WITH_CODE (GClueMinUINT,
gclue_min_uint,
G_TYPE_OBJECT,
G_ADD_PRIVATE (GClueMinUINT))
enum
{
PROP_0,
PROP_VALUE,
LAST_PROP
};
static GParamSpec *gParamSpecs[LAST_PROP];
typedef struct
{
GClueMinUINT *muint;
GObject *owner;
} OwnerData;
static gboolean
on_owner_weak_ref_notify_defered (OwnerData *data)
{
gclue_min_uint_drop_value (data->muint, data->owner);
g_object_unref (data->muint);
g_slice_free (OwnerData, data);
return FALSE;
}
static void
on_owner_weak_ref_notify (gpointer data, GObject *object)
{
OwnerData *owner_data = g_slice_new (OwnerData);
owner_data->muint = GCLUE_MIN_UINT (data);
g_object_ref (owner_data->muint);
owner_data->owner = object;
// Let's ensure owner is really gone before we drop its value
g_idle_add ((GSourceFunc) on_owner_weak_ref_notify_defered, owner_data);
}
static void
gclue_min_uint_finalize (GObject *object)
{
g_clear_pointer (&GCLUE_MIN_UINT (object)->priv->all_values,
g_hash_table_unref);
/* Chain up to the parent class */
G_OBJECT_CLASS (gclue_min_uint_parent_class)->finalize (object);
}
static void
gclue_min_uint_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GClueMinUINT *muint = GCLUE_MIN_UINT (object);
switch (prop_id) {
case PROP_VALUE:
g_value_set_uint (value, gclue_min_uint_get_value (muint));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gclue_min_uint_class_init (GClueMinUINTClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gclue_min_uint_finalize;
object_class->get_property = gclue_min_uint_get_property;
gParamSpecs[PROP_VALUE] = g_param_spec_uint ("value",
"Value",
"The minimum value",
0,
G_MAXINT,
0,
G_PARAM_READABLE);
g_object_class_install_property (object_class,
PROP_VALUE,
gParamSpecs[PROP_VALUE]);
}
static void
gclue_min_uint_init (GClueMinUINT *muint)
{
muint->priv = gclue_min_uint_get_instance_private (muint);
muint->priv->all_values = g_hash_table_new (g_direct_hash,
g_direct_equal);
muint->priv->notify_value = TRUE;
}
/**
* gclue_min_uint_new
*
* Returns: A new #GClueMinUINT instance.
**/
GClueMinUINT *
gclue_min_uint_new (void)
{
return g_object_new (GCLUE_TYPE_MIN_UINT, NULL);
}
/**
* gclue_min_uint_get_value
* @muint: a #GClueMinUINT
*
* Returns: The current minimum value from the list.
**/
guint
gclue_min_uint_get_value (GClueMinUINT *muint)
{
guint value;
GList *values, *l;
g_return_val_if_fail (GCLUE_IS_MIN_UINT(muint), 0);
if (g_hash_table_size (muint->priv->all_values) == 0)
return 0;
values = g_hash_table_get_values (muint->priv->all_values);
value = GPOINTER_TO_UINT (values->data);
for (l = values->next; l; l = l->next) {
guint i = GPOINTER_TO_UINT (l->data);
if (value > i) {
value = i;
}
}
g_list_free (values);
return value;
}
/**
* gclue_min_uint_add_value
* @muint: a #GClueMinUINT
* @value: A value to add to the list
* @owner: the object adding this value
*
* If @owner has already added a value previously, this call will simply replace
* that. i-e Each object can only add one value at a time.
**/
void
gclue_min_uint_add_value (GClueMinUINT *muint,
guint value,
GObject *owner)
{
g_return_if_fail (GCLUE_IS_MIN_UINT(muint));
g_hash_table_replace (muint->priv->all_values,
owner,
GUINT_TO_POINTER (value));
g_object_weak_ref (owner, on_owner_weak_ref_notify, muint);
g_object_notify_by_pspec (G_OBJECT (muint), gParamSpecs[PROP_VALUE]);
}
/**
* gclue_min_uint_drop_value
* @muint: a #GClueMinUINT
* @owner: the object that adadded a value previously
**/
void
gclue_min_uint_drop_value (GClueMinUINT *muint,
GObject *owner)
{
g_return_if_fail (GCLUE_IS_MIN_UINT(muint));
if (!g_hash_table_remove (muint->priv->all_values, owner)) {
return;
}
g_object_notify_by_pspec (G_OBJECT (muint), gParamSpecs[PROP_VALUE]);
}
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