glib/gio/gsocketaddressenumerator.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gsocketaddressenumerator.h"
#include "glibintl.h"
#include "gsimpleasyncresult.h"
G_DEFINE_ABSTRACT_TYPE (GSocketAddressEnumerator, g_socket_address_enumerator, G_TYPE_OBJECT);
static void g_socket_address_enumerator_real_next_async (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
static GSocketAddress *g_socket_address_enumerator_real_next_finish (GSocketAddressEnumerator *enumerator,
GAsyncResult *result,
GError **error);
static void
g_socket_address_enumerator_init (GSocketAddressEnumerator *enumerator)
{
}
static void
g_socket_address_enumerator_class_init (GSocketAddressEnumeratorClass *enumerator_class)
{
enumerator_class->next_async = g_socket_address_enumerator_real_next_async;
enumerator_class->next_finish = g_socket_address_enumerator_real_next_finish;
}
/**
* g_socket_address_enumerator_next:
* @enumerator: a #GSocketAddressEnumerator
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @error: a #GError.
*
* Retrieves the next #GSocketAddress from @enumerator. Note that this
* may block for some amount of time. (Eg, a #GNetworkAddress may need
* to do a DNS lookup before it can return an address.) Use
* g_socket_address_enumerator_next_async() if you need to avoid
* blocking.
*
* If @enumerator is expected to yield addresses, but for some reason
* is unable to (eg, because of a DNS error), then the first call to
* g_socket_address_enumerator_next() will return an appropriate error
* in *@error. However, if the first call to
* g_socket_address_enumerator_next() succeeds, then any further
* internal errors (other than @cancellable being triggered) will be
* ignored.
*
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* Return value: (transfer full): a #GSocketAddress (owned by the caller), or %NULL on
* error (in which case *@error will be set) or if there are no
* more addresses.
*/
GSocketAddress *
g_socket_address_enumerator_next (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GError **error)
{
GSocketAddressEnumeratorClass *klass;
g_return_val_if_fail (G_IS_SOCKET_ADDRESS_ENUMERATOR (enumerator), NULL);
klass = G_SOCKET_ADDRESS_ENUMERATOR_GET_CLASS (enumerator);
return (* klass->next) (enumerator, cancellable, error);
}
/* Default implementation just calls the synchronous method; this can
* be used if the implementation already knows all of its addresses,
* and so the synchronous method will never block.
*/
static void
g_socket_address_enumerator_real_next_async (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSimpleAsyncResult *result;
GSocketAddress *address;
GError *error = NULL;
result = g_simple_async_result_new (G_OBJECT (enumerator),
callback, user_data,
g_socket_address_enumerator_real_next_async);
address = g_socket_address_enumerator_next (enumerator, cancellable, &error);
if (address)
g_simple_async_result_set_op_res_gpointer (result, address, NULL);
else if (error)
g_simple_async_result_take_error (result, error);
g_simple_async_result_complete_in_idle (result);
g_object_unref (result);
}
/**
* g_socket_address_enumerator_next_async:
* @enumerator: a #GSocketAddressEnumerator
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (scope async): a #GAsyncReadyCallback to call when the request
* is satisfied
* @user_data: (closure): the data to pass to callback function
*
* Asynchronously retrieves the next #GSocketAddress from @enumerator
* and then calls @callback, which must call
* g_socket_address_enumerator_next_finish() to get the result.
*/
void
g_socket_address_enumerator_next_async (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSocketAddressEnumeratorClass *klass;
g_return_if_fail (G_IS_SOCKET_ADDRESS_ENUMERATOR (enumerator));
klass = G_SOCKET_ADDRESS_ENUMERATOR_GET_CLASS (enumerator);
(* klass->next_async) (enumerator, cancellable, callback, user_data);
}
static GSocketAddress *
g_socket_address_enumerator_real_next_finish (GSocketAddressEnumerator *enumerator,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (result), NULL);
simple = G_SIMPLE_ASYNC_RESULT (result);
g_return_val_if_fail (g_simple_async_result_get_source_tag (simple) == g_socket_address_enumerator_real_next_async, NULL);
if (g_simple_async_result_propagate_error (simple, error))
return NULL;
else
return g_simple_async_result_get_op_res_gpointer (simple);
}
/**
* g_socket_address_enumerator_next_finish:
* @enumerator: a #GSocketAddressEnumerator
* @result: a #GAsyncResult
* @error: a #GError
*
* Retrieves the result of a completed call to
* g_socket_address_enumerator_next_async(). See
* g_socket_address_enumerator_next() for more information about
* error handling.
*
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* Return value: (transfer full): a #GSocketAddress (owned by the caller), or %NULL on
* error (in which case *@error will be set) or if there are no
* more addresses.
*/
GSocketAddress *
g_socket_address_enumerator_next_finish (GSocketAddressEnumerator *enumerator,
GAsyncResult *result,
GError **error)
{
GSocketAddressEnumeratorClass *klass;
g_return_val_if_fail (G_IS_SOCKET_ADDRESS_ENUMERATOR (enumerator), NULL);
klass = G_SOCKET_ADDRESS_ENUMERATOR_GET_CLASS (enumerator);
return (* klass->next_finish) (enumerator, result, error);
}