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Migrating docs.

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* docs/reference/gobject/tmpl/gtypeplugin.sgml:
	* gobject/gtypeplugin.c:
	* gobject/gtypeplugin.h:
	  Migrating docs.


svn path=/trunk/; revision=7079
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Stefan Kost 2008-06-21 18:20:43 +00:00
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ChangeLog
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@ -1,3 +1,10 @@
2008-06-21 Stefan Kost <ensonic@users.sf.net>
* docs/reference/gobject/tmpl/gtypeplugin.sgml:
* gobject/gtypeplugin.c:
* gobject/gtypeplugin.h:
Migrating docs.
2008-06-21 Stefan Kost <ensonic@users.sf.net> 2008-06-21 Stefan Kost <ensonic@users.sf.net>
* docs/reference/gobject/Makefile.am: * docs/reference/gobject/Makefile.am:
@ -9,7 +16,7 @@
* gobject/gparam.c: * gobject/gparam.c:
* gobject/gparam.h: * gobject/gparam.h:
* gobject/gtype.h: * gobject/gtype.h:
Convert character entities back. FIx some broken sgml. Convert character entities back. Fix some broken sgml.
2008-06-21 Stefan Kost <ensonic@users.sf.net> 2008-06-21 Stefan Kost <ensonic@users.sf.net>

187
docs/reference/gobject/tmpl/gtypeplugin.sgml
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@ -1,187 +0,0 @@
<!-- ##### SECTION Title ##### -->
GTypePlugin
<!-- ##### SECTION Short_Description ##### -->
An interface for dynamically loadable types
<!-- ##### SECTION Long_Description ##### -->
<para>
The GObject type system supports dynamic loading of types. The #GTypePlugin
interface is used to handle the lifecycle of dynamically loaded types.
It goes as follows:
</para>
<para>
<orderedlist>
<listitem><para>
The type is initially introduced (usually upon loading the module
the first time, or by your main application that knows what modules
introduces what types), like this:
<literal>new_type_id = g_type_register_dynamic (parent_type_id,
"TypeName",
new_type_plugin,
type_flags);
</literal>
where <literal>new_type_plugin</literal> is an implementation of the
#GTypePlugin interface.
</para></listitem>
<listitem><para>
The type's implementation is referenced, e.g. through
g_type_class_ref() or through g_type_create_instance() (this is
being called by g_object_new()) or through one of the above done on
a type derived from <literal>new_type_id</literal>.
</para></listitem>
<listitem><para>
This causes the type system to load the type's implementation by calling
g_type_plugin_use() and g_type_plugin_complete_type_info() on
<literal>new_type_plugin</literal>.
</para></listitem>
<listitem><para>
At some point the type's implementation isn't required anymore, e.g. after
g_type_class_unref() or g_type_free_instance() (called when the reference
count of an instance drops to zero).
</para></listitem>
<listitem><para>
This causes the type system to throw away the information retrieved from
g_type_plugin_complete_type_info() and then it calls
g_type_plugin_unuse() on <literal>new_type_plugin</literal>.
</para></listitem>
<listitem><para>
Things may repeat from the second step.
</para></listitem>
</orderedlist>
</para>
<para>
So basically, you need to implement a #GTypePlugin type that carries a
use_count, once use_count goes from zero to one, you need to load the
implementation to successfully handle the upcoming
g_type_plugin_complete_type_info() call. Later, maybe after succeeding
use/unuse calls, once use_count drops to zero, you can unload the
implementation again. The type system makes sure to call g_type_plugin_use()
and g_type_plugin_complete_type_info() again when the type is needed again.
</para>
<para>
#GTypeModule is an implementation of #GTypePlugin that already implements
most of this except for the actual module loading and unloading. It even
handles multiple registered types per module.
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
#GTypeModule and g_type_register_dynamic().
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### STRUCT GTypePlugin ##### -->
<para>
The <structname>GTypePlugin</structname> typedef is used as a placeholder
for objects that implement the <structname>GTypePlugin</structname>
interface.
</para>
<!-- ##### STRUCT GTypePluginClass ##### -->
<para>
The #GTypePlugin interface is used by the type system in order to handle
the lifecycle of dynamically loaded types.
</para>
@use_plugin: Increases the use count of the plugin.
@unuse_plugin: Decreases the use count of the plugin.
@complete_type_info: Fills in the #GTypeInfo and
#GTypeValueTable structs for the type. The structs are initialized
with <literal>memset(s, 0, sizeof (s))</literal> before calling
this function.
@complete_interface_info: Fills in missing parts of the #GInterfaceInfo
for the interface. The structs is initialized with
<literal>memset(s, 0, sizeof (s))</literal> before calling
this function.
<!-- ##### USER_FUNCTION GTypePluginUse ##### -->
<para>
The type of the @use_plugin function of #GTypePluginClass, which gets called
to increase the use count of @plugin.
</para>
@plugin: the #GTypePlugin whose use count should be increased
<!-- ##### USER_FUNCTION GTypePluginUnuse ##### -->
<para>
The type of the @unuse_plugin function of #GTypePluginClass.
</para>
@plugin: the #GTypePlugin whose use count should be decreased
<!-- ##### USER_FUNCTION GTypePluginCompleteTypeInfo ##### -->
<para>
The type of the @complete_type_info function of #GTypePluginClass.
</para>
@plugin: the #GTypePlugin
@g_type: the #GType whose info is completed
@info: the #GTypeInfo struct to fill in
@value_table: the #GTypeValueTable to fill in
<!-- ##### USER_FUNCTION GTypePluginCompleteInterfaceInfo ##### -->
<para>
The type of the @complete_interface_info function of #GTypePluginClass.
</para>
@plugin: the #GTypePlugin
@instance_type: the #GType of an instantiable type to which the interface
is added
@interface_type: the #GType of the interface whose info is completed
@info: the #GInterfaceInfo to fill in
<!-- ##### FUNCTION g_type_plugin_use ##### -->
<para>
Calls the @use_plugin function from the #GTypePluginClass of @plugin.
There should be no need to use this function outside of the GObject
type system itself.
</para>
@plugin: a #GTypePlugin
<!-- ##### FUNCTION g_type_plugin_unuse ##### -->
<para>
Calls the @unuse_plugin function from the #GTypePluginClass of @plugin.
There should be no need to use this function outside of the GObject
type system itself.
</para>
@plugin: a #GTypePlugin
<!-- ##### FUNCTION g_type_plugin_complete_type_info ##### -->
<para>
Calls the @complete_type_info function from the #GTypePluginClass of @plugin.
There should be no need to use this function outside of the GObject
type system itself.
</para>
@plugin: a #GTypePlugin
@g_type: the #GType whose info is completed
@info: the #GTypeInfo struct to fill in
@value_table: the #GTypeValueTable to fill in
<!-- ##### FUNCTION g_type_plugin_complete_interface_info ##### -->
<para>
Calls the @complete_interface_info function from the #GTypePluginClass
of @plugin. There should be no need to use this function outside of the
GObject type system itself.
</para>
@plugin: the #GTypePlugin
@instance_type: the #GType of an instantiable type to which the interface
is added
@interface_type: the #GType of the interface whose info is completed
@info: the #GInterfaceInfo to fill in

101
gobject/gtypeplugin.c
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@ -16,6 +16,68 @@
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA. * Boston, MA 02111-1307, USA.
*/ */
/**
* SECTION:gtypeplugin
* @Short_description: An interface for dynamically loadable types
* @See_also:#GTypeModule and g_type_register_dynamic().
* @Titile: GTypePlugin
*
* The GObject type system supports dynamic loading of types. The #GTypePlugin
* interface is used to handle the lifecycle of dynamically loaded types.
* It goes as follows:
*
* <orderedlist>
* <listitem><para>
* The type is initially introduced (usually upon loading the module
* the first time, or by your main application that knows what modules
* introduces what types), like this:
* |[
* new_type_id = g_type_register_dynamic (parent_type_id,
* "TypeName",
* new_type_plugin,
* type_flags);
* ]|
* where <literal>new_type_plugin</literal> is an implementation of the
* #GTypePlugin interface.
* </para></listitem>
* <listitem><para>
* The type's implementation is referenced, e.g. through
* g_type_class_ref() or through g_type_create_instance() (this is
* being called by g_object_new()) or through one of the above done on
* a type derived from <literal>new_type_id</literal>.
* </para></listitem>
* <listitem><para>
* This causes the type system to load the type's implementation by calling
* g_type_plugin_use() and g_type_plugin_complete_type_info() on
* <literal>new_type_plugin</literal>.
* </para></listitem>
* <listitem><para>
* At some point the type's implementation isn't required anymore, e.g. after
* g_type_class_unref() or g_type_free_instance() (called when the reference
* count of an instance drops to zero).
* </para></listitem>
* <listitem><para>
* This causes the type system to throw away the information retrieved from
* g_type_plugin_complete_type_info() and then it calls
* g_type_plugin_unuse() on <literal>new_type_plugin</literal>.
* </para></listitem>
* <listitem><para>
* Things may repeat from the second step.
* </para></listitem>
* </orderedlist>
*
* So basically, you need to implement a #GTypePlugin type that carries a
* use_count, once use_count goes from zero to one, you need to load the
* implementation to successfully handle the upcoming
* g_type_plugin_complete_type_info() call. Later, maybe after succeeding
* use/unuse calls, once use_count drops to zero, you can unload the
* implementation again. The type system makes sure to call g_type_plugin_use()
* and g_type_plugin_complete_type_info() again when the type is needed again.
*
* #GTypeModule is an implementation of #GTypePlugin that already implements
* most of this except for the actual module loading and unloading. It even
* handles multiple registered types per module.
*/
#include "gtypeplugin.h" #include "gtypeplugin.h"
#include "gobjectalias.h" #include "gobjectalias.h"
@ -41,6 +103,14 @@ g_type_plugin_get_type (void)
return type_plugin_type; return type_plugin_type;
} }
/**
* g_type_plugin_use:
* @plugin: a #GTypePlugin
*
* Calls the @use_plugin function from the #GTypePluginClass of @plugin.
* There should be no need to use this function outside of the GObject
* type system itself.
*/
void void
g_type_plugin_use (GTypePlugin *plugin) g_type_plugin_use (GTypePlugin *plugin)
{ {
@ -52,6 +122,14 @@ g_type_plugin_use (GTypePlugin *plugin)
iface->use_plugin (plugin); iface->use_plugin (plugin);
} }
/**
* g_type_plugin_unuse:
* @plugin: a #GTypePlugin
*
* Calls the @unuse_plugin function from the #GTypePluginClass of @plugin.
* There should be no need to use this function outside of the GObject
* type system itself.
*/
void void
g_type_plugin_unuse (GTypePlugin *plugin) g_type_plugin_unuse (GTypePlugin *plugin)
{ {
@ -63,6 +141,17 @@ g_type_plugin_unuse (GTypePlugin *plugin)
iface->unuse_plugin (plugin); iface->unuse_plugin (plugin);
} }
/**
* g_type_plugin_complete_type_info:
* @plugin: a #GTypePlugin
* @g_type: the #GType whose info is completed
* @info: the #GTypeInfo struct to fill in
* @value_table: the #GTypeValueTable to fill in
*
* Calls the @complete_type_info function from the #GTypePluginClass of @plugin.
* There should be no need to use this function outside of the GObject
* type system itself.
*/
void void
g_type_plugin_complete_type_info (GTypePlugin *plugin, g_type_plugin_complete_type_info (GTypePlugin *plugin,
GType g_type, GType g_type,
@ -82,6 +171,18 @@ g_type_plugin_complete_type_info (GTypePlugin *plugin,
value_table); value_table);
} }
/**
* g_type_plugin_complete_interface_info:
* @plugin: the #GTypePlugin
* @instance_type: the #GType of an instantiable type to which the interface
* is added
* @interface_type: the #GType of the interface whose info is completed
* @info: the #GInterfaceInfo to fill in
*
* Calls the @complete_interface_info function from the #GTypePluginClass
* of @plugin. There should be no need to use this function outside of the
* GObject type system itself.
*/
void void
g_type_plugin_complete_interface_info (GTypePlugin *plugin, g_type_plugin_complete_interface_info (GTypePlugin *plugin,
GType instance_type, GType instance_type,

55
gobject/gtypeplugin.h
View File

@ -38,16 +38,71 @@ G_BEGIN_DECLS
/* --- typedefs & structures --- */ /* --- typedefs & structures --- */
typedef struct _GTypePluginClass GTypePluginClass; typedef struct _GTypePluginClass GTypePluginClass;
/**
* GTypePluginUse:
* @plugin: the #GTypePlugin whose use count should be increased
*
* The type of the @use_plugin function of #GTypePluginClass, which gets called
* to increase the use count of @plugin.
*/
typedef void (*GTypePluginUse) (GTypePlugin *plugin); typedef void (*GTypePluginUse) (GTypePlugin *plugin);
/**
* GTypePluginUnuse:
* @plugin: the #GTypePlugin whose use count should be decreased
*
* The type of the @unuse_plugin function of #GTypePluginClass.
*/
typedef void (*GTypePluginUnuse) (GTypePlugin *plugin); typedef void (*GTypePluginUnuse) (GTypePlugin *plugin);
/**
* GTypePluginCompleteTypeInfo:
* @plugin: the #GTypePlugin
* @g_type: the #GType whose info is completed
* @info: the #GTypeInfo struct to fill in
* @value_table: the #GTypeValueTable to fill in
*
* The type of the @complete_type_info function of #GTypePluginClass.
*/
typedef void (*GTypePluginCompleteTypeInfo) (GTypePlugin *plugin, typedef void (*GTypePluginCompleteTypeInfo) (GTypePlugin *plugin,
GType g_type, GType g_type,
GTypeInfo *info, GTypeInfo *info,
GTypeValueTable *value_table); GTypeValueTable *value_table);
/**
* GTypePluginCompleteInterfaceInfo:
* @plugin: the #GTypePlugin
* @instance_type: the #GType of an instantiable type to which the interface
* is added
* @interface_type: the #GType of the interface whose info is completed
* @info: the #GInterfaceInfo to fill in
*
* The type of the @complete_interface_info function of #GTypePluginClass.
*/
typedef void (*GTypePluginCompleteInterfaceInfo) (GTypePlugin *plugin, typedef void (*GTypePluginCompleteInterfaceInfo) (GTypePlugin *plugin,
GType instance_type, GType instance_type,
GType interface_type, GType interface_type,
GInterfaceInfo *info); GInterfaceInfo *info);
/**
* GTypePlugin:
*
* The <structname>GTypePlugin</structname> typedef is used as a placeholder
* for objects that implement the <structname>GTypePlugin</structname>
* interface.
*/
/**
* GTypePluginClass:
* @use_plugin: Increases the use count of the plugin.
* @unuse_plugin: Decreases the use count of the plugin.
* @complete_type_info: Fills in the #GTypeInfo and
* #GTypeValueTable structs for the type. The structs are initialized
* with <literal>memset(s, 0, sizeof (s))</literal> before calling
* this function.
* @complete_interface_info: Fills in missing parts of the #GInterfaceInfo
* for the interface. The structs is initialized with
* <literal>memset(s, 0, sizeof (s))</literal> before calling
* this function.
*
* The #GTypePlugin interface is used by the type system in order to handle
* the lifecycle of dynamically loaded types.
*/
struct _GTypePluginClass struct _GTypePluginClass
{ {
/*< private >*/ /*< private >*/