gio::prelude

Trait AsyncInitableExt

Source 
pub trait AsyncInitableExt:
    IsA<AsyncInitable>
    + Sealed
    + 'static {
    // Provided methods
    unsafe fn init_async<P: FnOnce(Result<(), Error>) + 'static>(
        &self,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) { ... }
    unsafe fn init_future(
        &self,
        io_priority: Priority,
    ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>> { ... }
}
Expand description

Trait containing all AsyncInitable methods.

§Implementors

AsyncInitable, DBusConnection, DBusProxy

Provided Methods§

Source

unsafe fn init_async<P: FnOnce(Result<(), Error>) + 'static>( &self, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

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 will be returned. If @cancellable is not None, and the object doesn’t support cancellable initialization, the error 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 of the operation

§cancellable

optional #GCancellable object, None to ignore.

§callback

a #GAsyncReadyCallback to call when the request is satisfied

Source

unsafe fn init_future( &self, io_priority: Priority, ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>>

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§