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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*-
nautilus-directory.h: Nautilus directory model.
Copyright (C) 1999, 2000 Eazel, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Pavel Cisler <pavel@eazel.com>
*/
#include <config.h>
#include "nautilus-directory-notify.h"
#include "nautilus-file-changes-queue.h"
#include "nautilus-glib-extensions.h"
#ifdef G_THREADS_ENABLED
#define MUTEX_LOCK(a) if ((a) != NULL) g_mutex_lock (a)
#define MUTEX_UNLOCK(a) if ((a) != NULL) g_mutex_unlock (a)
#else
#define MUTEX_LOCK(a)
#define MUTEX_UNLOCK(a)
#endif
typedef enum {
CHANGE_FILE_INITIAL,
CHANGE_FILE_ADDED,
CHANGE_FILE_REMOVED,
CHANGE_FILE_MOVED,
CHANGE_METADATA_COPIED,
CHANGE_METADATA_MOVED,
CHANGE_METADATA_REMOVED,
CHANGE_POSITION_SET
} NautilusFileChangeKind;
typedef struct {
NautilusFileChangeKind kind;
char *from_uri;
char *to_uri;
GdkPoint point;
} NautilusFileChange;
typedef struct {
GList *head;
GList *tail;
#ifdef G_THREADS_ENABLED
GMutex *mutex;
#endif
} NautilusFileChangesQueue;
static NautilusFileChangesQueue *
nautilus_file_changes_queue_new (void)
{
NautilusFileChangesQueue *result;
result = g_new0 (NautilusFileChangesQueue, 1);
#ifdef G_THREADS_ENABLED
result->mutex = g_mutex_new ();
#endif
return result;
}
static NautilusFileChangesQueue *
nautilus_file_changes_queue_get (void)
{
static NautilusFileChangesQueue *file_changes_queue;
if (file_changes_queue == NULL) {
file_changes_queue = nautilus_file_changes_queue_new ();
}
return file_changes_queue;
}
#if 0 /* no public free call yet */
static void
nautilus_file_change_free (NautilusFileChange *change)
{
g_free (change->from_uri);
g_free (change->to_uri);
}
void
nautilus_file_changes_queue_free (NautilusFileChangesQueue *queue)
{
GList *p;
if (queue == NULL) {
return;
}
#ifdef G_THREADS_ENABLED
/* if lock on a defunct mutex were defined (returning a failure)
* we would lock here
*/
#endif
for (p = queue->head; p != NULL; p = p->next) {
nautilus_file_change_free (p->data);
}
g_list_free (queue->head);
#ifdef G_THREADS_ENABLED
g_mutex_free (queue->mutex);
#endif
g_free (queue);
}
#endif /* no public free call yet */
static void
nautilus_file_changes_queue_add_common (NautilusFileChangesQueue *queue,
NautilusFileChange *new_item)
{
/* enqueue the new queue item while locking down the list */
MUTEX_LOCK (queue->mutex);
queue->head = g_list_prepend (queue->head, new_item);
if (queue->tail == NULL)
queue->tail = queue->head;
MUTEX_UNLOCK (queue->mutex);
}
void
nautilus_file_changes_queue_file_added (const char *uri)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get();
new_item = g_new0 (NautilusFileChange, 1);
new_item->kind = CHANGE_FILE_ADDED;
new_item->from_uri = g_strdup (uri);
nautilus_file_changes_queue_add_common (queue, new_item);
}
void
nautilus_file_changes_queue_file_removed (const char *uri)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get();
new_item = g_new0 (NautilusFileChange, 1);
new_item->kind = CHANGE_FILE_REMOVED;
new_item->from_uri = g_strdup (uri);
nautilus_file_changes_queue_add_common (queue, new_item);
}
void
nautilus_file_changes_queue_file_moved (const char *from, const char *to)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get ();
new_item = g_new (NautilusFileChange, 1);
new_item->kind = CHANGE_FILE_MOVED;
new_item->from_uri = g_strdup (from);
new_item->to_uri = g_strdup (to);
nautilus_file_changes_queue_add_common (queue, new_item);
}
void
nautilus_file_changes_queue_schedule_metadata_copy (const char *from_uri,
const char *to_uri)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get ();
new_item = g_new (NautilusFileChange, 1);
new_item->kind = CHANGE_METADATA_COPIED;
new_item->from_uri = g_strdup (from_uri);
new_item->to_uri = g_strdup (to_uri);
nautilus_file_changes_queue_add_common (queue, new_item);
}
void
nautilus_file_changes_queue_schedule_metadata_move (const char *from_uri,
const char *to_uri)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get ();
new_item = g_new (NautilusFileChange, 1);
new_item->kind = CHANGE_METADATA_MOVED;
new_item->from_uri = g_strdup (from_uri);
new_item->to_uri = g_strdup (to_uri);
nautilus_file_changes_queue_add_common (queue, new_item);
}
void
nautilus_file_changes_queue_schedule_metadata_remove (const char *uri)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get ();
new_item = g_new (NautilusFileChange, 1);
new_item->kind = CHANGE_METADATA_REMOVED;
new_item->from_uri = g_strdup (uri);
nautilus_file_changes_queue_add_common (queue, new_item);
}
void
nautilus_file_changes_queue_schedule_position_setting (const char *uri,
GdkPoint point)
{
NautilusFileChange *new_item;
NautilusFileChangesQueue *queue;
queue = nautilus_file_changes_queue_get ();
new_item = g_new (NautilusFileChange, 1);
new_item->kind = CHANGE_POSITION_SET;
new_item->from_uri = g_strdup (uri);
new_item->point = point;
nautilus_file_changes_queue_add_common (queue, new_item);
}
static NautilusFileChange *
nautilus_file_changes_queue_get_change (NautilusFileChangesQueue *queue)
{
GList *new_tail;
NautilusFileChange *result;
g_assert (queue != NULL);
/* dequeue the tail item while locking down the list */
MUTEX_LOCK (queue->mutex);
if (queue->tail == NULL) {
result = NULL;
} else {
new_tail = queue->tail->prev;
result = queue->tail->data;
queue->head = g_list_remove_link (queue->head,
queue->tail);
g_list_free_1 (queue->tail);
queue->tail = new_tail;
}
MUTEX_UNLOCK (queue->mutex);
return result;
}
enum {
CONSUME_CHANGES_MAX_CHUNK = 20
};
static void
pairs_list_free (GList *pairs)
{
GList *p;
URIPair *pair;
/* deep delete the list of pairs */
for (p = pairs; p != NULL; p = p->next) {
/* delete the strings in each pair */
pair = p->data;
g_free (pair->from_uri);
g_free (pair->to_uri);
}
/* delete the list and the now empty pair structs */
nautilus_g_list_free_deep (pairs);
}
static void
position_setting_list_free (GList *list)
{
GList *p;
NautilusFileChangesQueuePositionSetting *item;
for (p = list; p != NULL; p = p->next) {
item = p->data;
g_free (item->uri);
}
/* delete the list and the now empty structs */
nautilus_g_list_free_deep (list);
}
/* go through changes in the change queue, send ones with the same kind
* in a list to the different nautilus_directory_notify calls
*/
void
nautilus_file_changes_consume_changes (gboolean consume_all)
{
NautilusFileChange *change;
GList *additions, *deletions, *moves;
GList *metadata_copy_requests, *metadata_move_requests, *metadata_remove_requests;
GList *position_setting_requests;
URIPair *pair;
NautilusFileChangesQueuePositionSetting *position_setting;
guint chunk_count;
NautilusFileChangesQueue *queue;
gboolean flush_needed;
additions = NULL;
deletions = NULL;
moves = NULL;
metadata_copy_requests = NULL;
metadata_move_requests = NULL;
metadata_remove_requests = NULL;
position_setting_requests = NULL;
queue = nautilus_file_changes_queue_get();
/* Consume changes from the queue, stuffing them into one of three lists,
* keep doing it while the changes are of the same kind, then send them off.
* This is to ensure that the changes get sent off in the same order that they
* arrived.
*/
for (chunk_count = 0; ; chunk_count++) {
change = nautilus_file_changes_queue_get_change (queue);
/* figure out if we need to flush the pending changes that we collected sofar */
if (change == NULL) {
flush_needed = TRUE;
/* no changes left, flush everything */
} else {
flush_needed = (additions != NULL
&& (change->kind != CHANGE_FILE_ADDED
&& change->kind != CHANGE_METADATA_COPIED
&& change->kind != CHANGE_POSITION_SET));
flush_needed |= (moves != NULL
&& (change->kind != CHANGE_FILE_MOVED
&& change->kind != CHANGE_METADATA_MOVED
&& change->kind != CHANGE_POSITION_SET));
flush_needed |= (deletions != NULL
&& (change->kind != CHANGE_FILE_REMOVED
&& change->kind != CHANGE_METADATA_REMOVED));
flush_needed |= (metadata_copy_requests != NULL
&& (change->kind != CHANGE_FILE_ADDED
&& change->kind != CHANGE_METADATA_COPIED
&& change->kind != CHANGE_POSITION_SET));
flush_needed |= (metadata_move_requests != NULL
&& (change->kind != CHANGE_FILE_MOVED
&& change->kind != CHANGE_METADATA_MOVED
&& change->kind != CHANGE_POSITION_SET));
flush_needed |= (metadata_remove_requests != NULL
&& (change->kind != CHANGE_FILE_REMOVED
&& change->kind != CHANGE_METADATA_REMOVED));
flush_needed |= (position_setting_requests != NULL
&& (change->kind != CHANGE_POSITION_SET
&& change->kind != CHANGE_FILE_ADDED
&& change->kind != CHANGE_FILE_MOVED
&& change->kind != CHANGE_METADATA_COPIED
&& change->kind != CHANGE_METADATA_MOVED));
flush_needed |= !consume_all && chunk_count >= CONSUME_CHANGES_MAX_CHUNK;
/* we have reached the chunk maximum */
}
if (flush_needed) {
/* Send changes we collected off.
* At one time we may only have one of the lists
* contain changes.
*/
if (deletions != NULL) {
nautilus_directory_notify_files_removed (deletions);
nautilus_g_list_free_deep (deletions);
deletions = NULL;
}
if (moves != NULL) {
nautilus_directory_notify_files_moved (moves);
pairs_list_free (moves);
moves = NULL;
}
if (additions != NULL) {
nautilus_directory_notify_files_added (additions);
nautilus_g_list_free_deep (additions);
additions = NULL;
}
if (metadata_copy_requests != NULL) {
nautilus_directory_schedule_metadata_copy (metadata_copy_requests);
pairs_list_free (metadata_copy_requests);
metadata_copy_requests = NULL;
}
if (metadata_move_requests != NULL) {
nautilus_directory_schedule_metadata_move (metadata_move_requests);
pairs_list_free (metadata_move_requests);
metadata_move_requests = NULL;
}
if (metadata_remove_requests != NULL) {
nautilus_directory_schedule_metadata_remove (metadata_remove_requests);
nautilus_g_list_free_deep (metadata_remove_requests);
metadata_remove_requests = NULL;
}
if (position_setting_requests != NULL) {
nautilus_directory_schedule_position_setting (position_setting_requests);
position_setting_list_free (position_setting_requests);
position_setting_requests = NULL;
}
}
if (change == NULL) {
/* we are done */
return;
}
/* add the new change to the list */
switch (change->kind) {
case CHANGE_FILE_ADDED:
additions = g_list_append (additions, change->from_uri);
break;
case CHANGE_FILE_REMOVED:
deletions = g_list_append (deletions, change->from_uri);
break;
case CHANGE_FILE_MOVED:
pair = g_new (URIPair, 1);
pair->from_uri = change->from_uri;
pair->to_uri = change->to_uri;
moves = g_list_append (moves, pair);
break;
case CHANGE_METADATA_COPIED:
pair = g_new (URIPair, 1);
pair->from_uri = change->from_uri;
pair->to_uri = change->to_uri;
metadata_copy_requests = g_list_append (metadata_copy_requests, pair);
break;
case CHANGE_METADATA_MOVED:
pair = g_new (URIPair, 1);
pair->from_uri = change->from_uri;
pair->to_uri = change->to_uri;
metadata_move_requests = g_list_append (metadata_move_requests, pair);
break;
case CHANGE_METADATA_REMOVED:
metadata_remove_requests = g_list_append (metadata_remove_requests,
change->from_uri);
break;
case CHANGE_POSITION_SET:
position_setting = g_new (NautilusFileChangesQueuePositionSetting, 1);
position_setting->uri = change->from_uri;
position_setting->point = change->point;
position_setting_requests = g_list_append (position_setting_requests,
position_setting);
break;
default:
g_assert_not_reached ();
break;
}
change->from_uri = NULL;
change->to_uri = NULL;
}
}
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