git.gag.com Git - fw/altos/blob - altoslib/AltosMapStore.java

   1 /*
   2  * Copyright © 2014 Keith Packard <keithp@keithp.com>
   3  *
   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; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 package org.altusmetrum.altoslib_11;
  20
  21 import java.io.*;
  22 import java.net.*;
  23 import java.util.*;
  24
  25 public class AltosMapStore {
  26         String                                  url;
  27         public File                             file;
  28         LinkedList<AltosMapStoreListener>       listeners = new LinkedList<AltosMapStoreListener>();
  29
  30         int                                     status;
  31
  32         private static File map_file(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
  33                 double lat = center.lat;
  34                 double lon = center.lon;
  35                 char chlat = lat < 0 ? 'S' : 'N';
  36                 char chlon = lon < 0 ? 'W' : 'E';
  37
  38                 if (lat < 0) lat = -lat;
  39                 if (lon < 0) lon = -lon;
  40                 String maptype_string = String.format("%s-", AltosMap.maptype_names[maptype]);
  41                 String format_string;
  42                 if (maptype == AltosMap.maptype_hybrid || maptype == AltosMap.maptype_satellite || maptype == AltosMap.maptype_terrain)
  43                         format_string = "jpg";
  44                 else
  45                         format_string = "png";
  46                 return new File(AltosPreferences.mapdir(),
  47                                 String.format("map-%c%.6f,%c%.6f-%s%d%s.%s",
  48                                               chlat, lat, chlon, lon, maptype_string, zoom, scale == 1 ? "" : String.format("-%d", scale), format_string));
  49         }
  50
  51         private static String map_url(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
  52                 String format_string;
  53                 int z = zoom;
  54
  55                 if (maptype == AltosMap.maptype_hybrid || maptype == AltosMap.maptype_satellite || maptype == AltosMap.maptype_terrain)
  56                         format_string = "jpg";
  57                 else
  58                         format_string = "png32";
  59
  60                 for (int s = 1; s < scale; s <<= 1)
  61                         z--;
  62
  63                 if (AltosVersion.has_google_maps_api_key())
  64                         return String.format("http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&scale=%d&sensor=false&maptype=%s&format=%s&key=%s",
  65                                              center.lat, center.lon, z, px_size/scale, px_size/scale, scale, AltosMap.maptype_names[maptype], format_string, AltosVersion.google_maps_api_key);
  66                 else
  67                         return String.format("http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&scale=%d&sensor=false&maptype=%s&format=%s",
  68                                              center.lat, center.lon, z, px_size/scale, px_size/scale, AltosMap.maptype_names[maptype], format_string);
  69         }
  70
  71         public int status() {
  72                 return status;
  73         }
  74
  75         public synchronized void add_listener(AltosMapStoreListener listener) {
  76                 if (!listeners.contains(listener))
  77                         listeners.add(listener);
  78                 listener.notify_store(this, status);
  79         }
  80
  81         public synchronized void remove_listener(AltosMapStoreListener listener) {
  82                 listeners.remove(listener);
  83         }
  84
  85         private synchronized void notify_listeners(int status) {
  86                 this.status = status;
  87                 for (AltosMapStoreListener listener : listeners)
  88                         listener.notify_store(this, status);
  89         }
  90
  91         static Object   forbidden_lock = new Object();
  92         static long     forbidden_time;
  93         static boolean  forbidden_set;
  94
  95         private int fetch_url() {
  96                 URL u;
  97
  98                 try {
  99                         u = new URL(url);
 100                 } catch (java.net.MalformedURLException e) {
 101                         return AltosMapTile.bad_request;
 102                 }
 103
 104                 byte[] data;
 105                 URLConnection uc = null;
 106                 try {
 107                         uc = u.openConnection();
 108                         String type = uc.getContentType();
 109                         int contentLength = uc.getContentLength();
 110                         if (uc instanceof HttpURLConnection) {
 111                                 int response = ((HttpURLConnection) uc).getResponseCode();
 112                                 switch (response) {
 113                                 case HttpURLConnection.HTTP_FORBIDDEN:
 114                                 case HttpURLConnection.HTTP_PAYMENT_REQUIRED:
 115                                 case HttpURLConnection.HTTP_UNAUTHORIZED:
 116                                         synchronized (forbidden_lock) {
 117                                                 forbidden_time = System.nanoTime();
 118                                                 forbidden_set = true;
 119                                                 return AltosMapTile.forbidden;
 120                                         }
 121                                 }
 122                         }
 123                         InputStream in = new BufferedInputStream(uc.getInputStream());
 124                         int bytesRead = 0;
 125                         int offset = 0;
 126                         data = new byte[contentLength];
 127                         while (offset < contentLength) {
 128                                 bytesRead = in.read(data, offset, data.length - offset);
 129                                 if (bytesRead == -1)
 130                                         break;
 131                                 offset += bytesRead;
 132                         }
 133                         in.close();
 134
 135                         if (offset != contentLength)
 136                                 return AltosMapTile.failed;
 137
 138                 } catch (IOException e) {
 139                         return AltosMapTile.failed;
 140                 }
 141
 142                 try {
 143                         FileOutputStream out = new FileOutputStream(file);
 144                         out.write(data);
 145                         out.flush();
 146                         out.close();
 147                 } catch (FileNotFoundException e) {
 148                         return AltosMapTile.bad_request;
 149                 } catch (IOException e) {
 150                         if (file.exists())
 151                                 file.delete();
 152                         return AltosMapTile.bad_request;
 153                 }
 154                 return AltosMapTile.fetched;
 155         }
 156
 157         static Object   fetch_lock = new Object();
 158
 159         static final long       forbidden_interval = 60l * 1000l * 1000l * 1000l;
 160         static final long       google_maps_ratelimit_ms = 1200;
 161
 162         static Object   fetcher_lock = new Object();
 163
 164         static LinkedList<AltosMapStore> waiting = new LinkedList<AltosMapStore>();
 165         static LinkedList<AltosMapStore> running = new LinkedList<AltosMapStore>();
 166
 167         static final int concurrent_fetchers = 128;
 168
 169         static void start_fetchers() {
 170                 while (!waiting.isEmpty() && running.size() < concurrent_fetchers) {
 171                         AltosMapStore   s = waiting.remove();
 172                         running.add(s);
 173                         Thread lt = s.make_fetcher_thread();
 174                         lt.start();
 175                 }
 176         }
 177
 178         void finish_fetcher() {
 179                 synchronized(fetcher_lock) {
 180                         running.remove(this);
 181                         start_fetchers();
 182                 }
 183         }
 184
 185         void add_fetcher() {
 186                 synchronized(fetcher_lock) {
 187                         waiting.add(this);
 188                         start_fetchers();
 189                 }
 190         }
 191
 192         class fetcher implements Runnable {
 193
 194                 public void run() {
 195                         try {
 196                                 if (file.exists()) {
 197                                         notify_listeners(AltosMapTile.fetched);
 198                                         return;
 199                                 }
 200
 201                                 synchronized(forbidden_lock) {
 202                                         if (forbidden_set && (System.nanoTime() - forbidden_time) < forbidden_interval) {
 203                                                 notify_listeners(AltosMapTile.forbidden);
 204                                                 return;
 205                                         }
 206                                 }
 207
 208                                 int new_status;
 209
 210                                 if (!AltosVersion.has_google_maps_api_key()) {
 211                                         synchronized (fetch_lock) {
 212                                                 long startTime = System.nanoTime();
 213                                                 new_status = fetch_url();
 214                                                 if (new_status == AltosMapTile.fetched) {
 215                                                         long duration_ms = (System.nanoTime() - startTime) / 1000000;
 216                                                         if (duration_ms < google_maps_ratelimit_ms) {
 217                                                                 try {
 218                                                                         Thread.sleep(google_maps_ratelimit_ms - duration_ms);
 219                                                                 } catch (InterruptedException e) {
 220                                                                         Thread.currentThread().interrupt();
 221                                                                 }
 222                                                         }
 223                                                 }
 224                                         }
 225                                 } else {
 226                                         new_status = fetch_url();
 227                                 }
 228                                 notify_listeners(new_status);
 229                         } finally {
 230                                 finish_fetcher();
 231                         }
 232                 }
 233         }
 234
 235         private Thread make_fetcher_thread() {
 236                 return new Thread(new fetcher());
 237         }
 238
 239         private void fetch() {
 240                 add_fetcher();
 241         }
 242
 243         private AltosMapStore (String url, File file) {
 244                 this.url = url;
 245                 this.file = file;
 246
 247                 if (file.exists())
 248                         status = AltosMapTile.fetched;
 249                 else {
 250                         status = AltosMapTile.fetching;
 251                         fetch();
 252                 }
 253         }
 254
 255         public int hashCode() {
 256                 return url.hashCode();
 257         }
 258
 259         public boolean equals(Object o) {
 260                 if (o == null)
 261                         return false;
 262
 263                 if (!(o instanceof AltosMapStore))
 264                         return false;
 265
 266                 AltosMapStore other = (AltosMapStore) o;
 267                 return url.equals(other.url);
 268         }
 269
 270         static HashMap<String,AltosMapStore> stores = new HashMap<String,AltosMapStore>();
 271
 272         public static AltosMapStore get(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
 273                 String url = map_url(center, zoom, maptype, px_size, scale);
 274
 275                 AltosMapStore   store;
 276                 synchronized(stores) {
 277                         if (stores.containsKey(url)) {
 278                                 store = stores.get(url);
 279                         } else {
 280                                 store = new AltosMapStore(url, map_file(center, zoom, maptype, px_size, scale));
 281                                 stores.put(url, store);
 282                         }
 283                 }
 284                 return store;
 285         }
 286
 287 }