2 * Copyright © 2010 Anthony Towns <aj@erisian.com.au>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
18 package org.altusmetrum.altosuilib_3;
21 import javax.imageio.ImageIO;
22 import java.awt.image.*;
27 public class AltosUIMapCache implements AltosUIMapCacheListener {
28 static final int success = 0;
29 static final int loading = 1;
30 static final int failed = 2;
31 static final int bad_request = 3;
32 static final int forbidden = 4;
34 int min_cache_size; /* configured minimum cache size */
35 int cache_size; /* current cache size */
36 int requested_cache_size; /* cache size computed by application */
38 private Object fetch_lock = new Object();
39 private Object cache_lock = new Object();
41 AltosUIMapImage[] images = new AltosUIMapImage[cache_size];
45 public void set_cache_size(int new_size) {
47 requested_cache_size = new_size;
49 if (new_size < min_cache_size)
50 new_size = min_cache_size;
52 if (new_size == cache_size)
55 synchronized(cache_lock) {
56 AltosUIMapImage[] new_images = new AltosUIMapImage[new_size];
58 for (int i = 0; i < cache_size; i++) {
60 new_images[i] = images[i];
61 else if (images[i] != null)
65 cache_size = new_size;
69 public Image get(AltosUIMapTile tile, AltosUIMapStore store, int width, int height) {
73 synchronized(cache_lock) {
74 AltosUIMapImage image = null;
75 for (int i = 0; i < cache_size; i++) {
82 if (store.equals(image.store)) {
86 if (image.used < age) {
93 image = new AltosUIMapImage(tile, store);
95 if (images[oldest] != null)
96 images[oldest].flush();
98 images[oldest] = image;
100 if (image.image == null)
101 tile.set_status(loading);
103 tile.set_status(success);
106 } catch (IOException e) {
107 tile.set_status(failed);
113 public void map_cache_changed(int map_cache) {
114 min_cache_size = map_cache;
116 set_cache_size(requested_cache_size);
119 public void dispose() {
120 AltosUIPreferences.unregister_map_cache_listener(this);
122 for (int i = 0; i < cache_size; i++) {
123 AltosUIMapImage image = images[i];
130 public AltosUIMapCache() {
131 min_cache_size = AltosUIPreferences.map_cache();
135 AltosUIPreferences.register_map_cache_listener(this);