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WpPolicy: add a way of signaling policy changes

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This can be used by code that depends on policy to re-evaluate
choices they have made in the past that could now change based
on the new policy.
This commit is contained in:
George Kiagiadakis 2019-06-14 13:54:56 +03:00
parent 5cb1232f27
commit 5a863fe50c
2 changed files with 67 additions and 18 deletions
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81
lib/wp/policy.c
View file

@ -16,6 +16,13 @@ struct _WpPolicyManager
GList *policies;
};
enum {
SIGNAL_CHANGED,
N_SIGNALS,
};
static guint signals[N_SIGNALS];
G_DEFINE_TYPE (WpPolicyManager, wp_policy_manager, G_TYPE_OBJECT)
static void
@ -39,6 +46,10 @@ wp_policy_manager_class_init (WpPolicyManagerClass *klass)
GObjectClass *object_class = (GObjectClass *) klass;
object_class->finalize = wp_policy_manager_finalize;
signals[SIGNAL_CHANGED] = g_signal_new ("policy-changed",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
static void
@ -75,20 +86,34 @@ policy_mgr_endpoint_removed (WpCore *core, GQuark key, WpEndpoint *ep,
}
}
static WpPolicyManager *
wp_policy_manager_new (WpCore *core)
/**
* WpPolicyManager::wp_policy_manager_get_instance:
* @core: the #WpCore
*
* Returns: (transfer full): the instance of #WpPolicyManager that is
* registered on the @core
*/
WpPolicyManager *
wp_policy_manager_get_instance (WpCore *core)
{
WpPolicyManager *mgr = g_object_new (WP_TYPE_POLICY_MANAGER, NULL);
WpPolicyManager *mgr;
g_signal_connect_object (core, "global-added::endpoint",
(GCallback) policy_mgr_endpoint_added, mgr, 0);
g_signal_connect_object (core, "global-removed::endpoint",
(GCallback) policy_mgr_endpoint_removed, mgr, 0);
g_return_val_if_fail (WP_IS_CORE (core), NULL);
wp_core_register_global (core, WP_GLOBAL_POLICY_MANAGER, mgr,
g_object_unref);
mgr = wp_core_get_global (core, WP_GLOBAL_POLICY_MANAGER);
if (G_UNLIKELY (!mgr)) {
mgr = g_object_new (WP_TYPE_POLICY_MANAGER, NULL);
return mgr;
g_signal_connect_object (core, "global-added::endpoint",
(GCallback) policy_mgr_endpoint_added, mgr, 0);
g_signal_connect_object (core, "global-removed::endpoint",
(GCallback) policy_mgr_endpoint_removed, mgr, 0);
wp_core_register_global (core, WP_GLOBAL_POLICY_MANAGER, mgr,
g_object_unref);
}
return g_object_ref (mgr);
}
/* WpPolicy */
@ -256,21 +281,19 @@ compare_ranks (const WpPolicy * a, const WpPolicy * b)
void
wp_policy_register (WpPolicy *self, WpCore *core)
{
WpPolicyManager *mgr;
g_autoptr (WpPolicyManager) mgr = NULL;
WpPolicyPrivate *priv;
g_return_if_fail (WP_IS_POLICY (self));
g_return_if_fail (WP_IS_CORE (core));
mgr = wp_core_get_global (core, WP_GLOBAL_POLICY_MANAGER);
if (G_UNLIKELY (!mgr))
mgr = wp_policy_manager_new (core);
mgr->policies = g_list_insert_sorted (mgr->policies, g_object_ref (self),
(GCompareFunc) compare_ranks);
priv = wp_policy_get_instance_private (self);
priv->core = core;
mgr = wp_policy_manager_get_instance (core);
mgr->policies = g_list_insert_sorted (mgr->policies, g_object_ref (self),
(GCompareFunc) compare_ranks);
g_signal_emit (mgr, signals[SIGNAL_CHANGED], 0);
}
void
@ -292,10 +315,32 @@ wp_policy_unregister (WpPolicy *self)
}
mgr->policies = g_list_remove (mgr->policies, self);
g_signal_emit (mgr, signals[SIGNAL_CHANGED], 0);
g_object_unref (self);
}
}
void
wp_policy_notify_changed (WpPolicy *self)
{
WpPolicyManager *mgr;
WpPolicyPrivate *priv;
g_return_if_fail (WP_IS_POLICY (self));
priv = wp_policy_get_instance_private (self);
if (priv->core) {
mgr = wp_core_get_global (priv->core, WP_GLOBAL_POLICY_MANAGER);
if (G_UNLIKELY (!mgr)) {
g_critical ("WpPolicy:%p seems registered, but the policy manager "
"is absent", self);
return;
}
g_signal_emit (mgr, signals[SIGNAL_CHANGED], 0);
}
}
/**
* wp_policy_find_endpoint:
* @core: the #WpCore

4
lib/wp/policy.h
View file

@ -52,12 +52,16 @@ struct _WpPolicyClass
guint32 *stream_id);
};
WpPolicyManager * wp_policy_manager_get_instance (WpCore *core);
guint32 wp_policy_get_rank (WpPolicy *self);
WpCore *wp_policy_get_core (WpPolicy *self);
void wp_policy_register (WpPolicy *self, WpCore *core);
void wp_policy_unregister (WpPolicy *self);
void wp_policy_notify_changed (WpPolicy *self);
WpEndpoint * wp_policy_find_endpoint (WpCore *core, GVariant *props,
guint32 *stream_id);