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3569de342e
Use this macro in gasyncinitable, gconverter, ginitable and gsocketconnectable https://bugzilla.gnome.org/show_bug.cgi?id=616245
365 lines
12 KiB
C
365 lines
12 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include "gasyncinitable.h"
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#include "gasyncresult.h"
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#include "gsimpleasyncresult.h"
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#include "glibintl.h"
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#include "gioalias.h"
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/**
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* SECTION:gasyncinitable
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* @short_description: Asynchronously failable object initialization interface
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* @include: gio/gio.h
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* @see_also: #GInitable
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*
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* This is the asynchronous version of #GInitable; it behaves the same
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* in all ways except that initialization is asynchronous. For more details
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* see the descriptions on #GInitable.
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*
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* A class may implement both the #GInitable and #GAsyncInitable interfaces.
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*
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* Users of objects implementing this are not intended to use the interface
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* method directly; instead it will be used automatically in various ways.
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* For C applications you generally just call g_async_initable_new_async()
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* directly, or indirectly via a foo_thing_new_async() wrapper. This will call
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* g_async_initable_init_async() under the cover, calling back with %NULL and
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* a set %GError on failure.
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*/
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static void g_async_initable_real_init_async (GAsyncInitable *initable,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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static gboolean g_async_initable_real_init_finish (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error);
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typedef GAsyncInitableIface GAsyncInitableInterface;
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G_DEFINE_INTERFACE (GAsyncInitable, g_async_initable, G_TYPE_OBJECT)
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static void
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g_async_initable_default_init (GAsyncInitableInterface *iface)
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{
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iface->init_async = g_async_initable_real_init_async;
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iface->init_finish = g_async_initable_real_init_finish;
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}
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/**
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* g_async_initable_init_async:
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* @initable: a #GAsyncInitable.
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* @io_priority: the <link linkend="io-priority">I/O priority</link>
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* of the operation.
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @callback: a #GAsyncReadyCallback to call when the request is satisfied
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* @user_data: the data to pass to callback function
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*
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* Starts asynchronous initialization of the object implementing the
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* interface. This must be done before any real use of the object after
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* initial construction. If the object also implements #GInitable you can
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* optionally call g_initable_init() instead.
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*
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* When the initialization is finished, @callback will be called. You can
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* then call g_async_initable_init_finish() to get the result of the
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* initialization.
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*
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* Implementations may also support cancellation. If @cancellable is not
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* %NULL, then initialization can be cancelled by triggering the cancellable
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* object from another thread. If the operation was cancelled, the error
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* %G_IO_ERROR_CANCELLED will be returned. If @cancellable is not %NULL, and
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* the object doesn't support cancellable initialization, the error
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* %G_IO_ERROR_NOT_SUPPORTED will be returned.
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*
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* If this function is not called, or returns with an error, then all
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* operations on the object should fail, generally returning the
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* error %G_IO_ERROR_NOT_INITIALIZED.
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*
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* Implementations of this method must be idempotent: i.e. multiple calls
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* to this function with the same argument should return the same results.
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* Only the first call initializes the object; further calls return the result
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* of the first call. This is so that it's safe to implement the singleton
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* pattern in the GObject constructor function.
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*
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* For classes that also support the #GInitable interface, the default
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* implementation of this method will run the g_initable_init() function
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* in a thread, so if you want to support asynchronous initialization via
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* threads, just implement the #GAsyncInitable interface without overriding
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* any interface methods.
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*
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* Since: 2.22
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*/
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void
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g_async_initable_init_async (GAsyncInitable *initable,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GAsyncInitableIface *iface;
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g_return_if_fail (G_IS_ASYNC_INITABLE (initable));
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iface = G_ASYNC_INITABLE_GET_IFACE (initable);
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(* iface->init_async) (initable, io_priority, cancellable, callback, user_data);
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}
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/**
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* g_async_initable_init_finish:
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* @initable: a #GAsyncInitable.
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* @res: a #GAsyncResult.
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* @error: a #GError location to store the error occuring, or %NULL to
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* ignore.
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*
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* Finishes asynchronous initialization and returns the result.
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* See g_async_initable_init_async().
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*
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* Returns: %TRUE if successful. If an error has occurred, this function
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* will return %FALSE and set @error appropriately if present.
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*
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* Since: 2.22
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*/
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gboolean
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g_async_initable_init_finish (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error)
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{
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GAsyncInitableIface *iface;
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g_return_val_if_fail (G_IS_ASYNC_INITABLE (initable), FALSE);
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g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
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if (G_IS_SIMPLE_ASYNC_RESULT (res))
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{
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GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
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if (g_simple_async_result_propagate_error (simple, error))
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return FALSE;
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}
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iface = G_ASYNC_INITABLE_GET_IFACE (initable);
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return (* iface->init_finish) (initable, res, error);
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}
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static void
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async_init_thread (GSimpleAsyncResult *res,
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GObject *object,
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GCancellable *cancellable)
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{
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GError *error = NULL;
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if (!g_initable_init (G_INITABLE (object), cancellable, &error))
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{
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g_simple_async_result_set_from_error (res, error);
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g_error_free (error);
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}
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}
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static void
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g_async_initable_real_init_async (GAsyncInitable *initable,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GSimpleAsyncResult *res;
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g_return_if_fail (G_IS_INITABLE (initable));
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res = g_simple_async_result_new (G_OBJECT (initable), callback, user_data,
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g_async_initable_real_init_async);
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g_simple_async_result_run_in_thread (res, async_init_thread,
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io_priority, cancellable);
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g_object_unref (res);
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}
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static gboolean
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g_async_initable_real_init_finish (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error)
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{
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return TRUE; /* Errors handled by base impl */
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}
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/**
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* g_async_initable_new_async:
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* @object_type: a #GType supporting #GAsyncInitable.
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* @io_priority: the <link linkend="io-priority">I/O priority</link>
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* of the operation.
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @callback: a #GAsyncReadyCallback to call when the initialization is
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* finished
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* @user_data: the data to pass to callback function
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* @first_property_name: the name of the first property, or %NULL if no
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* properties
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* @...: the value of the first property, followed by other property
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* value pairs, and ended by %NULL.
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*
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* Helper function for constructing #GAsyncInitiable object. This is
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* similar to g_object_new() but also initializes the object asynchronously.
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*
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* When the initialization is finished, @callback will be called. You can
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* then call g_async_initable_new_finish() to get the new object and check
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* for any errors.
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*
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* Since: 2.22
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*/
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void
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g_async_initable_new_async (GType object_type,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data,
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const gchar *first_property_name,
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...)
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{
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va_list var_args;
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va_start (var_args, first_property_name);
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g_async_initable_new_valist_async (object_type,
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first_property_name, var_args,
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io_priority, cancellable,
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callback, user_data);
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va_end (var_args);
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}
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/**
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* g_async_initable_newv_async:
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* @object_type: a #GType supporting #GAsyncInitable.
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* @n_parameters: the number of parameters in @parameters
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* @parameters: the parameters to use to construct the object
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* @io_priority: the <link linkend="io-priority">I/O priority</link>
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* of the operation.
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @callback: a #GAsyncReadyCallback to call when the initialization is
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* finished
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* @user_data: the data to pass to callback function
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*
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* Helper function for constructing #GAsyncInitiable object. This is
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* similar to g_object_newv() but also initializes the object asynchronously.
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*
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* When the initialization is finished, @callback will be called. You can
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* then call g_async_initable_new_finish() to get the new object and check
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* for any errors.
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*
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* Since: 2.22
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*/
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void
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g_async_initable_newv_async (GType object_type,
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guint n_parameters,
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GParameter *parameters,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GObject *obj;
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g_return_if_fail (G_TYPE_IS_ASYNC_INITABLE (object_type));
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obj = g_object_newv (object_type, n_parameters, parameters);
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g_async_initable_init_async (G_ASYNC_INITABLE (obj),
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io_priority, cancellable,
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callback, user_data);
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}
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/**
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* g_async_initable_new_valist_async:
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* @object_type: a #GType supporting #GAsyncInitable.
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* @first_property_name: the name of the first property, followed by
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* the value, and other property value pairs, and ended by %NULL.
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* @var_args: The var args list generated from @first_property_name.
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* @io_priority: the <link linkend="io-priority">I/O priority</link>
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* of the operation.
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @callback: a #GAsyncReadyCallback to call when the initialization is
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* finished
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* @user_data: the data to pass to callback function
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*
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* Helper function for constructing #GAsyncInitiable object. This is
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* similar to g_object_new_valist() but also initializes the object
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* asynchronously.
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*
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* When the initialization is finished, @callback will be called. You can
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* then call g_async_initable_new_finish() to get the new object and check
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* for any errors.
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*
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* Since: 2.22
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*/
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void
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g_async_initable_new_valist_async (GType object_type,
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const gchar *first_property_name,
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va_list var_args,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GObject *obj;
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g_return_if_fail (G_TYPE_IS_ASYNC_INITABLE (object_type));
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obj = g_object_new_valist (object_type,
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first_property_name,
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var_args);
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g_async_initable_init_async (G_ASYNC_INITABLE (obj),
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io_priority, cancellable,
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callback, user_data);
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g_object_unref (obj); /* Passed ownership to async call */
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}
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/**
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* g_async_initable_new_finish:
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* @initable: the #GAsyncInitable from the callback
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* @res: the #GAsyncResult.from the callback
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* @error: a #GError location to store the error occuring, or %NULL to
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* ignore.
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*
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* Finishes the async construction for the various g_async_initable_new calls,
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* returning the created object or %NULL on error.
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*
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* Returns: a newly created #GObject, or %NULL on error. Free with
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* g_object_unref().
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*
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* Since: 2.22
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*/
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GObject *
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g_async_initable_new_finish (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error)
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{
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if (g_async_initable_init_finish (initable, res, error))
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return g_object_ref (initable);
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else
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return NULL;
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}
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#define __G_ASYNC_INITABLE_C__
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#include "gioaliasdef.c"
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