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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Component listener.
*
* Author:
* Rodrigo Moya <rodrigo@ximian.com>
*
* Copyright 2002, Ximian, Inc.
*/
#include <bonobo/bonobo-exception.h>
#include <bonobo/bonobo-object.h>
#include "e-component-listener.h"
#include <libgnome/gnome-i18n.h>
#define PARENT_TYPE GTK_TYPE_OBJECT
#define DEFAULT_PING_DELAY 10000
struct _EComponentListenerPrivate {
Bonobo_Unknown component;
int ping_delay;
int ping_timeout_id;
};
static void e_component_listener_class_init (EComponentListenerClass *klass);
static void e_component_listener_init (EComponentListener *cl, EComponentListenerClass *klass);
static void e_component_listener_finalize (GObject *object);
static GObjectClass *parent_class = NULL;
enum {
COMPONENT_DIED,
LAST_SIGNAL
};
static guint comp_listener_signals[LAST_SIGNAL];
static void
e_component_listener_class_init (EComponentListenerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = e_component_listener_finalize;
klass->component_died = NULL;
comp_listener_signals[COMPONENT_DIED] =
g_signal_new ("component_died",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (EComponentListenerClass, component_died),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
e_component_listener_init (EComponentListener *cl, EComponentListenerClass *klass)
{
/* allocate internal structure */
cl->priv = g_new (EComponentListenerPrivate, 1);
cl->priv->component = CORBA_OBJECT_NIL;
cl->priv->ping_delay = DEFAULT_PING_DELAY;
cl->priv->ping_timeout_id = -1;
}
static void
e_component_listener_finalize (GObject *object)
{
EComponentListener *cl = (EComponentListener *) object;
g_return_if_fail (E_IS_COMPONENT_LISTENER (cl));
cl->priv->component = CORBA_OBJECT_NIL;
if (cl->priv->ping_timeout_id != -1) {
g_source_remove (cl->priv->ping_timeout_id);
cl->priv->ping_timeout_id = -1;
}
/* free memory */
g_free (cl->priv);
cl->priv = NULL;
if (G_OBJECT_CLASS (parent_class)->finalize)
(* G_OBJECT_CLASS (parent_class)->finalize) (object);
}
GType
e_component_listener_get_type (void)
{
static GType type = 0;
if (!type) {
static GTypeInfo info = {
sizeof (EComponentListenerClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) e_component_listener_class_init,
NULL, NULL,
sizeof (EComponentListener),
0,
(GInstanceInitFunc) e_component_listener_init
};
type = g_type_register_static (G_TYPE_OBJECT, "EComponentListener", &info, 0);
}
return type;
}
static gboolean
ping_component_callback (gpointer user_data)
{
gboolean alive;
int is_nil;
CORBA_Environment ev;
EComponentListener *cl = (EComponentListener *) user_data;
g_return_val_if_fail (E_IS_COMPONENT_LISTENER (cl), FALSE);
if (cl->priv->component == CORBA_OBJECT_NIL)
return FALSE;
CORBA_exception_init (&ev);
is_nil = CORBA_Object_is_nil (cl->priv->component, &ev);
if (BONOBO_EX (&ev)) {
g_message (_("ping_timeout_callback: could not determine if the "
"CORBA object is nil or not"));
goto out;
}
if (is_nil)
goto out;
alive = bonobo_unknown_ping (cl->priv->component, &ev);
if (alive) {
CORBA_exception_free (&ev);
return TRUE;
}
out:
/* the component has died, so we notify and close the timeout */
CORBA_exception_free (&ev);
/* we ref the object just in case it gets destroyed in the callbacks */
g_object_ref (G_OBJECT (cl));
g_signal_emit (G_OBJECT (cl), comp_listener_signals[COMPONENT_DIED], 0);
cl->priv->component = CORBA_OBJECT_NIL;
cl->priv->ping_timeout_id = -1;
g_object_unref (G_OBJECT (cl));
return FALSE;
}
static void
setup_ping_timeout (EComponentListener *cl)
{
if (cl->priv->ping_timeout_id != -1)
g_source_remove (cl->priv->ping_timeout_id);
cl->priv->ping_timeout_id = g_timeout_add (cl->priv->ping_delay,
ping_component_callback,
cl);
}
/**
* e_component_listener_new
* @comp: Component to listen for.
* @ping_delay: Delay (in ms) for pinging the component.
*
* Create a new #EComponentListener object, which allows to listen
* for a given component and get notified when that component dies.
*
* Returns: a component listener object.
*/
EComponentListener *
e_component_listener_new (Bonobo_Unknown comp, int ping_delay)
{
EComponentListener *cl;
cl = g_object_new (E_COMPONENT_LISTENER_TYPE, NULL);
cl->priv->component = comp;
/* set up the timeout function */
cl->priv->ping_delay = ping_delay > 0 ? ping_delay : DEFAULT_PING_DELAY;
setup_ping_timeout (cl);
return cl;
}
/**
* e_component_listener_get_ping_delay
* @cl: A #EComponentListener object.
*
* Get the ping delay being used to listen for an object.
*/
int
e_component_listener_get_ping_delay (EComponentListener *cl)
{
g_return_val_if_fail (E_IS_COMPONENT_LISTENER (cl), -1);
return cl->priv->ping_delay;
}
void
e_component_listener_set_ping_delay (EComponentListener *cl, int ping_delay)
{
g_return_if_fail (E_IS_COMPONENT_LISTENER (cl));
g_return_if_fail (ping_delay > 0);
cl->priv->ping_delay = ping_delay;
setup_ping_timeout (cl);
}
Bonobo_Unknown
e_component_listener_get_component (EComponentListener *cl)
{
g_return_val_if_fail (E_IS_COMPONENT_LISTENER (cl), CORBA_OBJECT_NIL);
return cl->priv->component;
}
void
e_component_listener_set_component (EComponentListener *cl, Bonobo_Unknown comp)
{
g_return_if_fail (E_IS_COMPONENT_LISTENER (cl));
cl->priv->component = comp;
setup_ping_timeout (cl);
}
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