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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Copyright (C) 2017 Red Hat, Inc. (www.redhat.com)
*
* 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.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/**
* SECTION: camel-weak-ref-group
* @include: camel/camel.h
* @short_description: A weak ref group
*
* A #GWeakRef as such is not suitable for large sets, because
* it causes big performance impact on free. This #CamelWeakRefGroup
* groups together weak references for the same object to minimize
* the performance issue of the #GWeakRef.
**/
#include "evolution-data-server-config.h"
#include <glib.h>
#include "camel-weak-ref-group.h"
struct _CamelWeakRefGroup {
guint ref_count;
gpointer object;
};
G_DEFINE_BOXED_TYPE (CamelWeakRefGroup, camel_weak_ref_group, camel_weak_ref_group_ref, camel_weak_ref_group_unref)
typedef struct _ObjectData {
guint64 use_count;
GWeakRef weakref;
} ObjectData;
static GHashTable *groups = NULL; /* gpointer ~> ObjectData */
G_LOCK_DEFINE_STATIC (groups);
static ObjectData *
object_data_new (gpointer object)
{
ObjectData *od;
od = g_slice_new (ObjectData);
od->use_count = 1;
g_weak_ref_init (&od->weakref, object);
return od;
}
static void
object_data_free (gpointer ptr)
{
ObjectData *od = ptr;
if (od) {
g_warn_if_fail (od->use_count == 0);
g_weak_ref_set (&od->weakref, NULL);
g_weak_ref_clear (&od->weakref);
g_slice_free (ObjectData, od);
}
}
/**
* camel_weak_ref_group_new:
*
* Returns: (transfer full): A new #CamelWeakRefGroup instance, which should
* be freed with camel_weak_ref_group_unref() when no longer needed.
*
* Since: 3.24
**/
CamelWeakRefGroup *
camel_weak_ref_group_new (void)
{
CamelWeakRefGroup *wrg;
wrg = g_slice_new (CamelWeakRefGroup);
wrg->ref_count = 1;
wrg->object = NULL;
return wrg;
}
/**
* camel_weak_ref_group_ref:
* @group: a #CamelWeakRefGroup
*
* Increases a reference count of the @group.
*
* Returns: the @group
*
* Since: 3.24
**/
CamelWeakRefGroup *
camel_weak_ref_group_ref (CamelWeakRefGroup *group)
{
g_return_val_if_fail (group != NULL, NULL);
G_LOCK (groups);
group->ref_count++;
G_UNLOCK (groups);
return group;
}
/**
* camel_weak_ref_group_unref:
* @group: a #CamelWeakRefGroup
*
* Decreases a reference count of the @group. The @group is
* freed when the reference count reaches zero.
*
* Since: 3.24
**/
void
camel_weak_ref_group_unref (CamelWeakRefGroup *group)
{
g_return_if_fail (group != NULL);
g_return_if_fail (group->ref_count > 0);
G_LOCK (groups);
group->ref_count--;
G_UNLOCK (groups);
if (!group->ref_count) {
camel_weak_ref_group_set (group, NULL);
g_slice_free (CamelWeakRefGroup, group);
}
}
/**
* camel_weak_ref_group_set:
* @group: a #CamelWeakRefGroup
* @object: (nullable): a #GObject descendant, or %NULL
*
* Sets the @object as the object help by this @group. If
* the @object is %NULL, then unsets any previously set.
*
* Since: 3.24
**/
void
camel_weak_ref_group_set (CamelWeakRefGroup *group,
gpointer object)
{
g_return_if_fail (group != NULL);
g_return_if_fail (!object || G_IS_OBJECT (object));
G_LOCK (groups);
if (object != group->object) {
ObjectData *od;
if (group->object) {
od = g_hash_table_lookup (groups, group->object);
g_warn_if_fail (od != NULL);
if (od) {
od->use_count--;
if (!od->use_count)
g_hash_table_remove (groups, group->object);
}
} else if (!groups) {
groups = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, object_data_free);
}
group->object = object;
if (group->object) {
od = g_hash_table_lookup (groups, group->object);
if (od) {
od->use_count++;
} else {
od = object_data_new (group->object);
g_hash_table_insert (groups, group->object, od);
}
}
if (groups && !g_hash_table_size (groups)) {
g_hash_table_destroy (groups);
groups = NULL;
}
}
G_UNLOCK (groups);
}
/**
* camel_weak_ref_group_get:
* @group: a #CamelWeakRefGroup
*
* Returns: (transfer full) (nullable): A referenced object associated with
* @group, or %NULL, when no object had been set to it. Use g_object_unref()
* to free it, when no longer needed.
*
* Since: 3.24
**/
gpointer
camel_weak_ref_group_get (CamelWeakRefGroup *group)
{
gpointer object = NULL;
g_return_val_if_fail (group != NULL, NULL);
G_LOCK (groups);
if (group->object) {
ObjectData *od = g_hash_table_lookup (groups, group->object);
g_warn_if_fail (od != NULL);
object = g_weak_ref_get (&od->weakref);
}
G_UNLOCK (groups);
return object;
}
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