init hs project

1 files changed, 141 insertions, 0 deletions

diff --git a/csrc/services/clock-service.c b/csrc/services/clock-service.c
new file mode 100644
index 0000000..c957011
--- /dev/null
+++ b/csrc/services/clock-service.c
@@ -0,0 +1,141 @@
+#include "services/clock-service.h"
+
+//
+// FoobarClockService:
+//
+// Service providing an auto-updating timestamp value which can be used to display the current time.
+//
+
+struct _FoobarClockService
+{
+	GObject    parent_instance;
+	GDateTime* time;
+	guint      source_id;
+};
+
+enum
+{
+	PROP_TIME = 1,
+	N_PROPS,
+};
+
+static GParamSpec* props[N_PROPS] = { 0 };
+
+static void     foobar_clock_service_class_init  ( FoobarClockServiceClass* klass );
+static void     foobar_clock_service_init        ( FoobarClockService*      self );
+static void     foobar_clock_service_get_property( GObject*                 object,
+                                                   guint                    prop_id,
+                                                   GValue*                  value,
+                                                   GParamSpec*              pspec );
+static void     foobar_clock_service_finalize    ( GObject*                 object );
+static gboolean foobar_clock_service_handle_tick ( gpointer                 userdata );
+
+G_DEFINE_FINAL_TYPE( FoobarClockService, foobar_clock_service, G_TYPE_OBJECT )
+
+// ---------------------------------------------------------------------------------------------------------------------
+// Service Implementation
+// ---------------------------------------------------------------------------------------------------------------------
+
+//
+// Static initialization for the clock service.
+//
+void foobar_clock_service_class_init( FoobarClockServiceClass* klass )
+{
+	GObjectClass* object_klass = G_OBJECT_CLASS( klass );
+	object_klass->get_property = foobar_clock_service_get_property;
+	object_klass->finalize = foobar_clock_service_finalize;
+
+	props[PROP_TIME] = g_param_spec_boxed(
+		"time",
+		"Time",
+		"The current time, regularly updated.",
+		G_TYPE_DATE_TIME,
+		G_PARAM_READABLE );
+	g_object_class_install_properties( object_klass, N_PROPS, props );
+}
+
+//
+// Instance initialization for the clock service.
+//
+void foobar_clock_service_init( FoobarClockService* self )
+{
+	self->time = g_date_time_new_now_local( );
+	self->source_id = g_timeout_add_seconds( 1, foobar_clock_service_handle_tick, self );
+}
+
+//
+// Property getter implementation, mapping a property id to a method.
+//
+void foobar_clock_service_get_property(
+	GObject*    object,
+	guint       prop_id,
+	GValue*     value,
+	GParamSpec* pspec )
+{
+	FoobarClockService* self = (FoobarClockService*)object;
+
+	switch ( prop_id )
+	{
+		case PROP_TIME:
+			g_value_set_boxed( value, foobar_clock_service_get_time( self ) );
+			break;
+		default:
+			G_OBJECT_WARN_INVALID_PROPERTY_ID( object, prop_id, pspec );
+			break;
+	}
+}
+
+//
+// Instance cleanup for the clock service.
+//
+void foobar_clock_service_finalize( GObject* object )
+{
+	FoobarClockService* self = (FoobarClockService*)object;
+
+	g_clear_pointer( &self->time, g_date_time_unref );
+	g_clear_handle_id( &self->source_id, g_source_remove );
+
+	G_OBJECT_CLASS( foobar_clock_service_parent_class )->finalize( object );
+}
+
+// ---------------------------------------------------------------------------------------------------------------------
+// Public API
+// ---------------------------------------------------------------------------------------------------------------------
+
+//
+// Create a new clock service instance.
+//
+FoobarClockService* foobar_clock_service_new( void )
+{
+	return g_object_new( FOOBAR_TYPE_CLOCK_SERVICE, NULL );
+}
+
+//
+// Get the current snapshot of the timestamp.
+//
+// This may be a bit older than the value returned by g_date_time_new_now_local.
+//
+GDateTime* foobar_clock_service_get_time( FoobarClockService* self )
+{
+	g_return_val_if_fail( FOOBAR_IS_CLOCK_SERVICE( self ), NULL );
+
+	return self->time;
+}
+
+// ---------------------------------------------------------------------------------------------------------------------
+// Signal Handlers
+// ---------------------------------------------------------------------------------------------------------------------
+
+//
+// Called every time the update delay has elapsed to update the current timestamp value.
+//
+gboolean foobar_clock_service_handle_tick( gpointer userdata )
+{
+	FoobarClockService* self = (FoobarClockService*)userdata;
+
+	g_clear_pointer( &self->time, g_date_time_unref );
+	self->time = g_date_time_new_now_local( );
+	g_object_notify_by_pspec( G_OBJECT( self ), props[PROP_TIME] );
+
+	return G_SOURCE_CONTINUE;
+}