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_12;
  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         public static int forbidden_response;
  95
  96         private int fetch_url() {
  97                 URL u;
  98
  99                 try {
 100                         u = new URL(url);
 101                 } catch (java.net.MalformedURLException e) {
 102                         return AltosMapTile.bad_request;
 103                 }
 104
 105                 byte[] data;
 106                 URLConnection uc = null;
 107                 try {
 108                         uc = u.openConnection();
 109                         String type = uc.getContentType();
 110                         int contentLength = uc.getContentLength();
 111                         if (uc instanceof HttpURLConnection) {
 112                                 int response = ((HttpURLConnection) uc).getResponseCode();
 113                                 switch (response) {
 114                                 case HttpURLConnection.HTTP_FORBIDDEN:
 115                                 case HttpURLConnection.HTTP_PAYMENT_REQUIRED:
 116                                 case HttpURLConnection.HTTP_UNAUTHORIZED:
 117                                         synchronized (forbidden_lock) {
 118                                                 forbidden_time = System.nanoTime();
 119                                                 forbidden_set = true;
 120                                                 forbidden_response = response;
 121                                                 return AltosMapTile.forbidden;
 122                                         }
 123                                 }
 124                         }
 125                         InputStream in = new BufferedInputStream(uc.getInputStream());
 126                         int bytesRead = 0;
 127                         int offset = 0;
 128                         data = new byte[contentLength];
 129                         while (offset < contentLength) {
 130                                 bytesRead = in.read(data, offset, data.length - offset);
 131                                 if (bytesRead == -1)
 132                                         break;
 133                                 offset += bytesRead;
 134                         }
 135                         in.close();
 136
 137                         if (offset != contentLength)
 138                                 return AltosMapTile.failed;
 139
 140                 } catch (IOException e) {
 141                         return AltosMapTile.failed;
 142                 }
 143
 144                 try {
 145                         FileOutputStream out = new FileOutputStream(file);
 146                         out.write(data);
 147                         out.flush();
 148                         out.close();
 149                 } catch (FileNotFoundException e) {
 150                         return AltosMapTile.bad_request;
 151                 } catch (IOException e) {
 152                         if (file.exists())
 153                                 file.delete();
 154                         return AltosMapTile.bad_request;
 155                 }
 156                 return AltosMapTile.fetched;
 157         }
 158
 159         static Object   fetch_lock = new Object();
 160
 161         static final long       forbidden_interval = 60l * 1000l * 1000l * 1000l;
 162         static final long       google_maps_ratelimit_ms = 1200;
 163
 164         static Object   fetcher_lock = new Object();
 165
 166         static LinkedList<AltosMapStore> waiting = new LinkedList<AltosMapStore>();
 167         static LinkedList<AltosMapStore> running = new LinkedList<AltosMapStore>();
 168
 169         static final int concurrent_fetchers = 128;
 170
 171         static void start_fetchers() {
 172                 while (!waiting.isEmpty() && running.size() < concurrent_fetchers) {
 173                         AltosMapStore   s = waiting.remove();
 174                         running.add(s);
 175                         Thread lt = s.make_fetcher_thread();
 176                         lt.start();
 177                 }
 178         }
 179
 180         void finish_fetcher() {
 181                 synchronized(fetcher_lock) {
 182                         running.remove(this);
 183                         start_fetchers();
 184                 }
 185         }
 186
 187         void add_fetcher() {
 188                 synchronized(fetcher_lock) {
 189                         waiting.add(this);
 190                         start_fetchers();
 191                 }
 192         }
 193
 194         class fetcher implements Runnable {
 195
 196                 public void run() {
 197                         try {
 198                                 if (file.exists()) {
 199                                         notify_listeners(AltosMapTile.fetched);
 200                                         return;
 201                                 }
 202
 203                                 synchronized(forbidden_lock) {
 204                                         if (forbidden_set && (System.nanoTime() - forbidden_time) < forbidden_interval) {
 205                                                 notify_listeners(AltosMapTile.forbidden);
 206                                                 return;
 207                                         }
 208                                 }
 209
 210                                 int new_status;
 211
 212                                 if (!AltosVersion.has_google_maps_api_key()) {
 213                                         synchronized (fetch_lock) {
 214                                                 long startTime = System.nanoTime();
 215                                                 new_status = fetch_url();
 216                                                 if (new_status == AltosMapTile.fetched) {
 217                                                         long duration_ms = (System.nanoTime() - startTime) / 1000000;
 218                                                         if (duration_ms < google_maps_ratelimit_ms) {
 219                                                                 try {
 220                                                                         Thread.sleep(google_maps_ratelimit_ms - duration_ms);
 221                                                                 } catch (InterruptedException e) {
 222                                                                         Thread.currentThread().interrupt();
 223                                                                 }
 224                                                         }
 225                                                 }
 226                                         }
 227                                 } else {
 228                                         new_status = fetch_url();
 229                                 }
 230                                 notify_listeners(new_status);
 231                         } finally {
 232                                 finish_fetcher();
 233                         }
 234                 }
 235         }
 236
 237         private Thread make_fetcher_thread() {
 238                 return new Thread(new fetcher());
 239         }
 240
 241         private void fetch() {
 242                 add_fetcher();
 243         }
 244
 245         private AltosMapStore (String url, File file) {
 246                 this.url = url;
 247                 this.file = file;
 248
 249                 if (file.exists())
 250                         status = AltosMapTile.fetched;
 251                 else {
 252                         status = AltosMapTile.fetching;
 253                         fetch();
 254                 }
 255         }
 256
 257         public int hashCode() {
 258                 return url.hashCode();
 259         }
 260
 261         public boolean equals(Object o) {
 262                 if (o == null)
 263                         return false;
 264
 265                 if (!(o instanceof AltosMapStore))
 266                         return false;
 267
 268                 AltosMapStore other = (AltosMapStore) o;
 269                 return url.equals(other.url);
 270         }
 271
 272         static HashMap<String,AltosMapStore> stores = new HashMap<String,AltosMapStore>();
 273
 274         public static AltosMapStore get(AltosLatLon center, int zoom, int maptype, int px_size, int scale) {
 275                 String url = map_url(center, zoom, maptype, px_size, scale);
 276
 277                 AltosMapStore   store;
 278                 synchronized(stores) {
 279                         if (stores.containsKey(url)) {
 280                                 store = stores.get(url);
 281                         } else {
 282                                 store = new AltosMapStore(url, map_file(center, zoom, maptype, px_size, scale));
 283                                 stores.put(url, store);
 284                         }
 285                 }
 286                 return store;
 287         }
 288
 289 }