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_2;
21 import javax.imageio.ImageIO;
22 import java.awt.image.*;
27 public class AltosSiteMapCache {
28 static final long google_maps_ratelimit_ms = 1200;
29 // Google limits static map queries to 50 per minute per IP, so
30 // each query should take at least 1.2 seconds.
32 static final int success = 0;
33 static final int loading = 1;
34 static final int failed = 2;
35 static final int bad_request = 3;
36 static final int forbidden = 4;
38 public static boolean has_map(File file, String url) {
42 static long forbidden_time;
43 static boolean forbidden_set = false;
44 static final long forbidden_interval = 60l * 1000l * 1000l * 1000l;
46 static private Object fetch_lock = new Object();
48 private static int fetch_one(File file, String url) {
53 } catch (java.net.MalformedURLException e) {
58 URLConnection uc = null;
60 uc = u.openConnection();
61 String type = uc.getContentType();
62 int contentLength = uc.getContentLength();
63 if (uc instanceof HttpURLConnection) {
64 int response = ((HttpURLConnection) uc).getResponseCode();
66 case HttpURLConnection.HTTP_FORBIDDEN:
67 case HttpURLConnection.HTTP_PAYMENT_REQUIRED:
68 case HttpURLConnection.HTTP_UNAUTHORIZED:
69 forbidden_time = System.nanoTime();
74 InputStream in = new BufferedInputStream(uc.getInputStream());
77 data = new byte[contentLength];
78 while (offset < contentLength) {
79 bytesRead = in.read(data, offset, data.length - offset);
86 if (offset != contentLength)
89 } catch (IOException e) {
94 FileOutputStream out = new FileOutputStream(file);
98 } catch (FileNotFoundException e) {
100 } catch (IOException e) {
108 public static int fetch_map(File file, String url) {
112 if (forbidden_set && (System.nanoTime() - forbidden_time) < forbidden_interval)
115 int status = bad_request;
117 if (!AltosUIVersion.has_google_maps_api_key()) {
118 synchronized (fetch_lock) {
119 long startTime = System.nanoTime();
120 status = fetch_one(file, url);
121 if (status == success) {
122 long duration_ms = (System.nanoTime() - startTime) / 1000000;
123 if (duration_ms < google_maps_ratelimit_ms) {
125 Thread.sleep(google_maps_ratelimit_ms - duration_ms);
126 } catch (InterruptedException e) {
127 Thread.currentThread().interrupt();
133 status = fetch_one(file, url);
138 static final int min_cache_size = 9;
139 static final int max_cache_size = 24;
141 static int cache_size = min_cache_size;
143 static AltosSiteMapImage[] images = new AltosSiteMapImage[cache_size];
145 static Object cache_lock = new Object();
147 public static void set_cache_size(int new_size) {
148 if (new_size < min_cache_size)
149 new_size = min_cache_size;
150 if (new_size > max_cache_size)
151 new_size = max_cache_size;
152 if (new_size == cache_size)
155 synchronized(cache_lock) {
156 AltosSiteMapImage[] new_images = new AltosSiteMapImage[new_size];
158 for (int i = 0; i < cache_size; i++) {
160 new_images[i] = images[i];
165 cache_size = new_size;
171 private static Point tile_loc(AltosSiteMapTile tile) {
172 Rectangle r = tile.getBounds();
176 return new Point (x, y);
180 private static void dump_cache() {
181 int min_x = 1000, max_x = -1000, min_y = 1000, max_y = -1000;
183 for (int i = 0; i < cache_size; i++) {
184 AltosSiteMapImage image = images[i];
186 Point p = tile_loc(image.tile);
187 min_x = min_x < p.x ? min_x : p.x;
188 max_x = max_x > p.x ? max_x : p.x;
189 min_y = min_y < p.y ? min_y : p.y;
190 max_y = max_y > p.y ? max_y : p.y;
191 System.out.printf ("entry %d %d,%d used %d\n", i, p.x, p.y, image.used);
193 System.out.printf ("entry %d empty\n", i);
197 int[][] map = new int[max_x - min_x + 1][max_y - min_y + 1];
198 for (int i = 0; i < cache_size; i++) {
199 AltosSiteMapImage image = images[i];
201 Point p = tile_loc(image.tile);
202 map[p.x - min_x][p.y - min_y]++;
206 for (int y = min_y; y <= max_y; y++) {
207 for (int x = min_x; x <= max_x; x++)
208 System.out.printf (" %2d", map[x - min_x][y - min_y]);
209 System.out.printf("\n");
214 public static AltosSiteMapImage get_image(AltosSiteMapTile tile, File file, int width, int height) {
218 synchronized(cache_lock) {
219 AltosSiteMapImage image = null;
220 for (int i = 0; i < cache_size; i++) {
227 if (image.tile == tile && file.equals(image.file)) {
231 if (image.used < age) {
238 image = new AltosSiteMapImage(tile, file, width, height);
240 if (images[oldest] != null) {
242 AltosSiteMap.debug_component(images[oldest].tile, "replacing cache");
243 AltosSiteMap.debug_component(tile, "replaced cache");
244 images[oldest].flush();
246 images[oldest] = image;
248 } catch (IOException e) {