1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use crate::{AsyncResult, Cancellable};
use glib::{prelude::*, translate::*};
use std::{boxed::Box as Box_, pin::Pin};

glib::wrapper! {
    /// `GAsyncInitable` is an interface for asynchronously initializable objects.
    ///
    /// This is the asynchronous version of [`Initable`][crate::Initable]; it behaves the same
    /// in all ways except that initialization is asynchronous. For more details
    /// see the descriptions on `GInitable`.
    ///
    /// A class may implement both the `GInitable` and `GAsyncInitable` interfaces.
    ///
    /// Users of objects implementing this are not intended to use the interface
    /// method directly; instead it will be used automatically in various ways.
    /// For C applications you generally just call [`new_async()`][Self::new_async()]
    /// directly, or indirectly via a foo_thing_new_async() wrapper. This will call
    /// [`AsyncInitableExt::init_async()`][crate::prelude::AsyncInitableExt::init_async()] under the covers, calling back with `NULL`
    /// and a set `GError` on failure.
    ///
    /// A typical implementation might look something like this:
    ///
    /// **⚠️ The following code is in c ⚠️**
    ///
    /// ```c
    /// enum {
    ///    NOT_INITIALIZED,
    ///    INITIALIZING,
    ///    INITIALIZED
    /// };
    ///
    /// static void
    /// _foo_ready_cb (Foo *self)
    /// {
    ///   GList *l;
    ///
    ///   self->priv->state = INITIALIZED;
    ///
    ///   for (l = self->priv->init_results; l != NULL; l = l->next)
    ///     {
    ///       GTask *task = l->data;
    ///
    ///       if (self->priv->success)
    ///         g_task_return_boolean (task, TRUE);
    ///       else
    ///         g_task_return_new_error (task, ...);
    ///       g_object_unref (task);
    ///     }
    ///
    ///   g_list_free (self->priv->init_results);
    ///   self->priv->init_results = NULL;
    /// }
    ///
    /// static void
    /// foo_init_async (GAsyncInitable       *initable,
    ///                 int                   io_priority,
    ///                 GCancellable         *cancellable,
    ///                 GAsyncReadyCallback   callback,
    ///                 gpointer              user_data)
    /// {
    ///   Foo *self = FOO (initable);
    ///   GTask *task;
    ///
    ///   task = g_task_new (initable, cancellable, callback, user_data);
    ///   g_task_set_name (task, G_STRFUNC);
    ///
    ///   switch (self->priv->state)
    ///     {
    ///       case NOT_INITIALIZED:
    ///         _foo_get_ready (self);
    ///         self->priv->init_results = g_list_append (self->priv->init_results,
    ///                                                   task);
    ///         self->priv->state = INITIALIZING;
    ///         break;
    ///       case INITIALIZING:
    ///         self->priv->init_results = g_list_append (self->priv->init_results,
    ///                                                   task);
    ///         break;
    ///       case INITIALIZED:
    ///         if (!self->priv->success)
    ///           g_task_return_new_error (task, ...);
    ///         else
    ///           g_task_return_boolean (task, TRUE);
    ///         g_object_unref (task);
    ///         break;
    ///     }
    /// }
    ///
    /// static gboolean
    /// foo_init_finish (GAsyncInitable       *initable,
    ///                  GAsyncResult         *result,
    ///                  GError              **error)
    /// {
    ///   g_return_val_if_fail (g_task_is_valid (result, initable), FALSE);
    ///
    ///   return g_task_propagate_boolean (G_TASK (result), error);
    /// }
    ///
    /// static void
    /// foo_async_initable_iface_init (gpointer g_iface,
    ///                                gpointer data)
    /// {
    ///   GAsyncInitableIface *iface = g_iface;
    ///
    ///   iface->init_async = foo_init_async;
    ///   iface->init_finish = foo_init_finish;
    /// }
    /// ```
    ///
    /// # Implements
    ///
    /// [`AsyncInitableExt`][trait@crate::prelude::AsyncInitableExt]
    #[doc(alias = "GAsyncInitable")]
    pub struct AsyncInitable(Interface<ffi::GAsyncInitable, ffi::GAsyncInitableIface>);

    match fn {
        type_ => || ffi::g_async_initable_get_type(),
    }
}

impl AsyncInitable {
    pub const NONE: Option<&'static AsyncInitable> = None;
}

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::AsyncInitable>> Sealed for T {}
}

/// Trait containing all [`struct@AsyncInitable`] methods.
///
/// # Implementors
///
/// [`AsyncInitable`][struct@crate::AsyncInitable], [`DBusConnection`][struct@crate::DBusConnection], [`DBusProxy`][struct@crate::DBusProxy]
pub trait AsyncInitableExt: IsA<AsyncInitable> + sealed::Sealed + 'static {
    /// Starts asynchronous initialization of the object implementing the
    /// interface. This must be done before any real use of the object after
    /// initial construction. If the object also implements #GInitable you can
    /// optionally call g_initable_init() instead.
    ///
    /// This method is intended for language bindings. If writing in C,
    /// g_async_initable_new_async() should typically be used instead.
    ///
    /// When the initialization is finished, @callback will be called. You can
    /// then call g_async_initable_init_finish() to get the result of the
    /// initialization.
    ///
    /// Implementations may also support cancellation. If @cancellable is not
    /// [`None`], then initialization can be cancelled by triggering the cancellable
    /// object from another thread. If the operation was cancelled, the error
    /// [`IOErrorEnum::Cancelled`][crate::IOErrorEnum::Cancelled] will be returned. If @cancellable is not [`None`], and
    /// the object doesn't support cancellable initialization, the error
    /// [`IOErrorEnum::NotSupported`][crate::IOErrorEnum::NotSupported] will be returned.
    ///
    /// As with #GInitable, if the object is not initialized, or initialization
    /// returns with an error, then all operations on the object except
    /// g_object_ref() and g_object_unref() are considered to be invalid, and
    /// have undefined behaviour. They will often fail with g_critical() or
    /// g_warning(), but this must not be relied on.
    ///
    /// Callers should not assume that a class which implements #GAsyncInitable can
    /// be initialized multiple times; for more information, see g_initable_init().
    /// If a class explicitly supports being initialized multiple times,
    /// implementation requires yielding all subsequent calls to init_async() on the
    /// results of the first call.
    ///
    /// For classes that also support the #GInitable interface, the default
    /// implementation of this method will run the g_initable_init() function
    /// in a thread, so if you want to support asynchronous initialization via
    /// threads, just implement the #GAsyncInitable interface without overriding
    /// any interface methods.
    /// ## `io_priority`
    /// the [I/O priority][io-priority] of the operation
    /// ## `cancellable`
    /// optional #GCancellable object, [`None`] to ignore.
    /// ## `callback`
    /// a #GAsyncReadyCallback to call when the request is satisfied
    #[doc(alias = "g_async_initable_init_async")]
    unsafe fn init_async<P: FnOnce(Result<(), glib::Error>) + 'static>(
        &self,
        io_priority: glib::Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) {
        let main_context = glib::MainContext::ref_thread_default();
        let is_main_context_owner = main_context.is_owner();
        let has_acquired_main_context = (!is_main_context_owner)
            .then(|| main_context.acquire().ok())
            .flatten();
        assert!(
            is_main_context_owner || has_acquired_main_context.is_some(),
            "Async operations only allowed if the thread is owning the MainContext"
        );

        let user_data: Box_<glib::thread_guard::ThreadGuard<P>> =
            Box_::new(glib::thread_guard::ThreadGuard::new(callback));
        unsafe extern "C" fn init_async_trampoline<P: FnOnce(Result<(), glib::Error>) + 'static>(
            _source_object: *mut glib::gobject_ffi::GObject,
            res: *mut crate::ffi::GAsyncResult,
            user_data: glib::ffi::gpointer,
        ) {
            let mut error = std::ptr::null_mut();
            let _ = ffi::g_async_initable_init_finish(_source_object as *mut _, res, &mut error);
            let result = if error.is_null() {
                Ok(())
            } else {
                Err(from_glib_full(error))
            };
            let callback: Box_<glib::thread_guard::ThreadGuard<P>> =
                Box_::from_raw(user_data as *mut _);
            let callback: P = callback.into_inner();
            callback(result);
        }
        let callback = init_async_trampoline::<P>;
        ffi::g_async_initable_init_async(
            self.as_ref().to_glib_none().0,
            io_priority.into_glib(),
            cancellable.map(|p| p.as_ref()).to_glib_none().0,
            Some(callback),
            Box_::into_raw(user_data) as *mut _,
        );
    }

    unsafe fn init_future(
        &self,
        io_priority: glib::Priority,
    ) -> Pin<Box_<dyn std::future::Future<Output = Result<(), glib::Error>> + 'static>> {
        Box_::pin(crate::GioFuture::new(
            self,
            move |obj, cancellable, send| {
                obj.init_async(io_priority, Some(cancellable), move |res| {
                    send.resolve(res);
                });
            },
        ))
    }
}

impl<O: IsA<AsyncInitable>> AsyncInitableExt for O {}