| /* GIO - GLib Input, Output and Streaming Library |
| * |
| * Copyright (C) 2006-2007 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 2.1 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, see <http://www.gnu.org/licenses/>. |
| * |
| * Author: Alexander Larsson <alexl@redhat.com> |
| */ |
| |
| #include "config.h" |
| #include <string.h> |
| |
| #include "gpollfilemonitor.h" |
| #include "gfile.h" |
| #include "gfilemonitor.h" |
| #include "gfileinfo.h" |
| |
| |
| static gboolean g_poll_file_monitor_cancel (GFileMonitor* monitor); |
| static void schedule_poll_timeout (GPollFileMonitor* poll_monitor); |
| |
| struct _GPollFileMonitor |
| { |
| GFileMonitor parent_instance; |
| GFile *file; |
| GFileInfo *last_info; |
| GSource *timeout; |
| }; |
| |
| #define POLL_TIME_SECS 5 |
| |
| #define g_poll_file_monitor_get_type _g_poll_file_monitor_get_type |
| G_DEFINE_TYPE (GPollFileMonitor, g_poll_file_monitor, G_TYPE_FILE_MONITOR) |
| |
| static void |
| g_poll_file_monitor_finalize (GObject* object) |
| { |
| GPollFileMonitor* poll_monitor; |
| |
| poll_monitor = G_POLL_FILE_MONITOR (object); |
| |
| g_poll_file_monitor_cancel (G_FILE_MONITOR (poll_monitor)); |
| g_object_unref (poll_monitor->file); |
| g_clear_object (&poll_monitor->last_info); |
| |
| G_OBJECT_CLASS (g_poll_file_monitor_parent_class)->finalize (object); |
| } |
| |
| |
| static void |
| g_poll_file_monitor_class_init (GPollFileMonitorClass* klass) |
| { |
| GObjectClass* gobject_class = G_OBJECT_CLASS (klass); |
| GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass); |
| |
| gobject_class->finalize = g_poll_file_monitor_finalize; |
| |
| file_monitor_class->cancel = g_poll_file_monitor_cancel; |
| } |
| |
| static void |
| g_poll_file_monitor_init (GPollFileMonitor* poll_monitor) |
| { |
| } |
| |
| static int |
| calc_event_type (GFileInfo *last, |
| GFileInfo *new) |
| { |
| if (last == NULL && new == NULL) |
| return -1; |
| |
| if (last == NULL && new != NULL) |
| return G_FILE_MONITOR_EVENT_CREATED; |
| |
| if (last != NULL && new == NULL) |
| return G_FILE_MONITOR_EVENT_DELETED; |
| |
| if (g_strcmp0 (g_file_info_get_etag (last), g_file_info_get_etag (new))) |
| return G_FILE_MONITOR_EVENT_CHANGED; |
| |
| if (g_file_info_get_size (last) != g_file_info_get_size (new)) |
| return G_FILE_MONITOR_EVENT_CHANGED; |
| |
| return -1; |
| } |
| |
| static void |
| got_new_info (GObject *source_object, |
| GAsyncResult *res, |
| gpointer user_data) |
| { |
| GPollFileMonitor* poll_monitor = user_data; |
| GFileInfo *info; |
| int event; |
| |
| info = g_file_query_info_finish (poll_monitor->file, res, NULL); |
| |
| if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor))) |
| { |
| event = calc_event_type (poll_monitor->last_info, info); |
| |
| if (event != -1) |
| { |
| g_file_monitor_emit_event (G_FILE_MONITOR (poll_monitor), |
| poll_monitor->file, |
| NULL, event); |
| /* We're polling so slowly anyway, so always emit the done hint */ |
| if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor)) && |
| (event == G_FILE_MONITOR_EVENT_CHANGED || event == G_FILE_MONITOR_EVENT_CREATED)) |
| g_file_monitor_emit_event (G_FILE_MONITOR (poll_monitor), |
| poll_monitor->file, |
| NULL, G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT); |
| } |
| |
| if (poll_monitor->last_info) |
| { |
| g_object_unref (poll_monitor->last_info); |
| poll_monitor->last_info = NULL; |
| } |
| |
| if (info) |
| poll_monitor->last_info = g_object_ref (info); |
| |
| schedule_poll_timeout (poll_monitor); |
| } |
| |
| if (info) |
| g_object_unref (info); |
| |
| g_object_unref (poll_monitor); |
| } |
| |
| static gboolean |
| poll_file_timeout (gpointer data) |
| { |
| GPollFileMonitor* poll_monitor = data; |
| |
| g_source_unref (poll_monitor->timeout); |
| poll_monitor->timeout = NULL; |
| |
| g_file_query_info_async (poll_monitor->file, G_FILE_ATTRIBUTE_ETAG_VALUE "," G_FILE_ATTRIBUTE_STANDARD_SIZE, |
| 0, 0, NULL, got_new_info, g_object_ref (poll_monitor)); |
| |
| return G_SOURCE_REMOVE; |
| } |
| |
| static void |
| schedule_poll_timeout (GPollFileMonitor* poll_monitor) |
| { |
| poll_monitor->timeout = g_timeout_source_new_seconds (POLL_TIME_SECS); |
| g_source_set_callback (poll_monitor->timeout, poll_file_timeout, poll_monitor, NULL); |
| g_source_attach (poll_monitor->timeout, g_main_context_get_thread_default ()); |
| } |
| |
| static void |
| got_initial_info (GObject *source_object, |
| GAsyncResult *res, |
| gpointer user_data) |
| { |
| GPollFileMonitor* poll_monitor = user_data; |
| GFileInfo *info; |
| |
| info = g_file_query_info_finish (poll_monitor->file, res, NULL); |
| |
| poll_monitor->last_info = info; |
| |
| if (!g_file_monitor_is_cancelled (G_FILE_MONITOR (poll_monitor))) |
| schedule_poll_timeout (poll_monitor); |
| |
| g_object_unref (poll_monitor); |
| } |
| |
| /** |
| * _g_poll_file_monitor_new: |
| * @file: a #GFile. |
| * |
| * Polls @file for changes. |
| * |
| * Returns: a new #GFileMonitor for the given #GFile. |
| **/ |
| GFileMonitor* |
| _g_poll_file_monitor_new (GFile *file) |
| { |
| GPollFileMonitor* poll_monitor; |
| |
| poll_monitor = g_object_new (G_TYPE_POLL_FILE_MONITOR, NULL); |
| |
| poll_monitor->file = g_object_ref (file); |
| |
| g_file_query_info_async (file, G_FILE_ATTRIBUTE_ETAG_VALUE "," G_FILE_ATTRIBUTE_STANDARD_SIZE, |
| 0, 0, NULL, got_initial_info, g_object_ref (poll_monitor)); |
| |
| return G_FILE_MONITOR (poll_monitor); |
| } |
| |
| static gboolean |
| g_poll_file_monitor_cancel (GFileMonitor* monitor) |
| { |
| GPollFileMonitor *poll_monitor = G_POLL_FILE_MONITOR (monitor); |
| |
| if (poll_monitor->timeout) |
| { |
| g_source_destroy (poll_monitor->timeout); |
| g_source_unref (poll_monitor->timeout); |
| poll_monitor->timeout = NULL; |
| } |
| |
| return TRUE; |
| } |