2 * AT-SPI - Assistive Technology Service Provider Interface
3 * (Gnome Accessibility Project; http://developer.gnome.org/projects/gap)
5 * Copyright 2009, 2010 Codethink Ltd.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
27 #include "accessible-leasing.h"
31 #include "accessible-cache.h"
34 /*---------------------------------------------------------------------------*/
36 SpiLeasing *spi_global_leasing;
38 typedef struct _ExpiryElement
44 static void spi_leasing_dispose (GObject * object);
46 static void spi_leasing_finalize (GObject * object);
48 static void add_expiry_timeout (SpiLeasing * leasing);
50 /*---------------------------------------------------------------------------*/
52 G_DEFINE_TYPE (SpiLeasing, spi_leasing, G_TYPE_OBJECT)
54 static void spi_leasing_class_init (SpiLeasingClass * klass)
56 GObjectClass *object_class = (GObjectClass *) klass;
58 spi_leasing_parent_class = g_type_class_ref (G_TYPE_OBJECT);
60 object_class->finalize = spi_leasing_finalize;
61 object_class->dispose = spi_leasing_dispose;
65 spi_leasing_init (SpiLeasing * leasing)
67 leasing->expiry_queue = g_queue_new ();
68 leasing->expiry_func_id = 0;
72 spi_leasing_finalize (GObject * object)
74 SpiLeasing *leasing = SPI_LEASING (object);
76 if (leasing->expiry_func_id)
77 g_source_remove (leasing->expiry_func_id);
78 g_queue_free (leasing->expiry_queue);
79 G_OBJECT_CLASS (spi_leasing_parent_class)->finalize (object);
83 spi_leasing_dispose (GObject * object)
85 SpiLeasing *leasing = SPI_LEASING (object);
88 while ((head = g_queue_pop_head (leasing->expiry_queue)))
90 g_object_unref (head->object);
91 g_slice_free (ExpiryElement, head);
93 G_OBJECT_CLASS (spi_leasing_parent_class)->dispose (object);
96 /*---------------------------------------------------------------------------*/
99 End the lease on all objects whose expiry time has passed.
101 Check when the next event is and set the next expiry func.
104 expiry_func (gpointer data)
106 SpiLeasing *leasing = SPI_LEASING (data);
108 ExpiryElement *head, *current;
111 g_get_current_time (&t);
113 head = g_queue_peek_head (leasing->expiry_queue);
114 while (head != NULL && head->expiry_s <= t.tv_sec)
116 current = g_queue_pop_head (leasing->expiry_queue);
119 g_debug ("REVOKE - ");
120 spi_cache_print_info (current->object);
123 g_object_unref (current->object);
124 g_slice_free (ExpiryElement, current);
126 head = g_queue_peek_head (leasing->expiry_queue);
129 leasing->expiry_func_id = 0;
130 add_expiry_timeout (leasing);
135 /*---------------------------------------------------------------------------*/
138 Checks if an expiry timeout is already scheduled, if so returns.
139 This is becasue events will always be added to the end of the queue.
140 Events are always later in time to previoulsy added events.
142 Otherwise calculate the next wake time using the top of the queue
143 and add the next expiry function.
145 This function is called when a lease is added or at the end of the
146 expiry function to add the next expiry timeout.
149 add_expiry_timeout (SpiLeasing * leasing)
155 if (leasing->expiry_func_id != 0)
158 elem = (ExpiryElement *) g_queue_peek_head (leasing->expiry_queue);
162 /* The current time is implicitly rounded down here by ignoring the us */
163 g_get_current_time (&t);
164 next_expiry = elem->expiry_s - t.tv_sec;
165 leasing->expiry_func_id = spi_timeout_add_seconds (next_expiry,
166 expiry_func, leasing);
169 /*---------------------------------------------------------------------------*/
172 The lease time is expected to be in seconds, the rounding is going to be to
173 intervals of 1 second.
175 The lease time is going to be rounded up, as the lease time should be
176 considered a MINIMUM that the object will be leased for.
178 #define LEASE_TIME_S 15
179 #define EXPIRY_TIME_S (LEASE_TIME_S + 1)
182 spi_leasing_take (SpiLeasing * leasing, GObject * object)
185 Get the current time.
187 Add the release event to the queue.
188 Check the next expiry.
196 g_get_current_time (&t);
197 expiry_s = t.tv_sec + EXPIRY_TIME_S;
199 elem = g_slice_new (ExpiryElement);
200 elem->expiry_s = expiry_s;
201 elem->object = g_object_ref (object);
203 g_queue_push_tail (leasing->expiry_queue, elem);
205 add_expiry_timeout (leasing);
208 g_debug ("LEASE - ");
209 spi_cache_print_info (object);
215 /*END------------------------------------------------------------------------*/