1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.imagery;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.io.ByteArrayInputStream;
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7 | import java.io.IOException;
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8 | import java.net.URL;
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9 | import java.util.HashSet;
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10 | import java.util.List;
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11 | import java.util.Map;
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12 | import java.util.Map.Entry;
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13 | import java.util.Optional;
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14 | import java.util.Set;
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15 | import java.util.concurrent.ConcurrentHashMap;
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16 | import java.util.concurrent.ConcurrentMap;
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17 | import java.util.concurrent.ThreadPoolExecutor;
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18 | import java.util.concurrent.TimeUnit;
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19 |
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20 | import org.apache.commons.jcs.access.behavior.ICacheAccess;
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21 | import org.openstreetmap.gui.jmapviewer.Tile;
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22 | import org.openstreetmap.gui.jmapviewer.interfaces.TileJob;
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23 | import org.openstreetmap.gui.jmapviewer.interfaces.TileLoaderListener;
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24 | import org.openstreetmap.gui.jmapviewer.interfaces.TileSource;
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25 | import org.openstreetmap.gui.jmapviewer.tilesources.AbstractTMSTileSource;
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26 | import org.openstreetmap.josm.data.cache.BufferedImageCacheEntry;
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27 | import org.openstreetmap.josm.data.cache.CacheEntry;
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28 | import org.openstreetmap.josm.data.cache.CacheEntryAttributes;
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29 | import org.openstreetmap.josm.data.cache.ICachedLoaderListener;
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30 | import org.openstreetmap.josm.data.cache.JCSCachedTileLoaderJob;
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31 | import org.openstreetmap.josm.data.preferences.LongProperty;
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32 | import org.openstreetmap.josm.tools.HttpClient;
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33 | import org.openstreetmap.josm.tools.Logging;
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34 |
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35 | /**
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36 | * Class bridging TMS requests to JCS cache requests
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37 | *
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38 | * @author Wiktor Niesiobędzki
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39 | * @since 8168
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40 | */
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41 | public class TMSCachedTileLoaderJob extends JCSCachedTileLoaderJob<String, BufferedImageCacheEntry> implements TileJob, ICachedLoaderListener {
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42 | private static final LongProperty MAXIMUM_EXPIRES = new LongProperty("imagery.generic.maximum_expires", TimeUnit.DAYS.toMillis(30));
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43 | private static final LongProperty MINIMUM_EXPIRES = new LongProperty("imagery.generic.minimum_expires", TimeUnit.HOURS.toMillis(1));
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44 | protected final Tile tile;
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45 | private volatile URL url;
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46 |
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47 | // we need another deduplication of Tile Loader listeners, as for each submit, new TMSCachedTileLoaderJob was created
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48 | // that way, we reduce calls to tileLoadingFinished, and general CPU load due to surplus Map repaints
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49 | private static final ConcurrentMap<String, Set<TileLoaderListener>> inProgress = new ConcurrentHashMap<>();
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50 |
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51 | /**
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52 | * Constructor for creating a job, to get a specific tile from cache
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53 | * @param listener Tile loader listener
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54 | * @param tile to be fetched from cache
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55 | * @param cache object
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56 | * @param connectTimeout when connecting to remote resource
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57 | * @param readTimeout when connecting to remote resource
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58 | * @param headers HTTP headers to be sent together with request
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59 | * @param downloadExecutor that will be executing the jobs
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60 | */
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61 | public TMSCachedTileLoaderJob(TileLoaderListener listener, Tile tile,
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62 | ICacheAccess<String, BufferedImageCacheEntry> cache,
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63 | int connectTimeout, int readTimeout, Map<String, String> headers,
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64 | ThreadPoolExecutor downloadExecutor) {
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65 | super(cache, connectTimeout, readTimeout, headers, downloadExecutor);
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66 | this.tile = tile;
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67 | if (listener != null) {
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68 | String deduplicationKey = getCacheKey();
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69 | synchronized (inProgress) {
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70 | inProgress.computeIfAbsent(deduplicationKey, k -> new HashSet<>()).add(listener);
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71 | }
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72 | }
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73 | }
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74 |
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75 | @Override
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76 | public String getCacheKey() {
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77 | if (tile != null) {
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78 | TileSource tileSource = tile.getTileSource();
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79 | return Optional.ofNullable(tileSource.getName()).orElse("").replace(':', '_') + ':'
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80 | + tileSource.getTileId(tile.getZoom(), tile.getXtile(), tile.getYtile());
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81 | }
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82 | return null;
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83 | }
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84 |
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85 | /*
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86 | * this doesn't needs to be synchronized, as it's not that costly to keep only one execution
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87 | * in parallel, but URL creation and Tile.getUrl() are costly and are not needed when fetching
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88 | * data from cache, that's why URL creation is postponed until it's needed
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89 | *
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90 | * We need to have static url value for TileLoaderJob, as for some TileSources we might get different
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91 | * URL's each call we made (servers switching), and URL's are used below as a key for duplicate detection
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92 | *
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93 | */
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94 | @Override
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95 | public URL getUrl() throws IOException {
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96 | if (url == null) {
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97 | synchronized (this) {
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98 | if (url == null) {
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99 | String sUrl = tile.getUrl();
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100 | if (!"".equals(sUrl)) {
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101 | url = new URL(sUrl);
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102 | }
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103 | }
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104 | }
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105 | }
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106 | return url;
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107 | }
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108 |
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109 | @Override
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110 | public boolean isObjectLoadable() {
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111 | if (cacheData != null) {
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112 | byte[] content = cacheData.getContent();
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113 | try {
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114 | return content.length > 0 || cacheData.getImage() != null || isNoTileAtZoom();
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115 | } catch (IOException e) {
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116 | Logging.logWithStackTrace(Logging.LEVEL_WARN, e, "JCS TMS - error loading from cache for tile {0}: {1}",
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117 | new Object[] {tile.getKey(), e.getMessage()}
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118 | );
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119 | }
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120 | }
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121 | return false;
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122 | }
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123 |
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124 | @Override
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125 | protected boolean isResponseLoadable(Map<String, List<String>> headers, int statusCode, byte[] content) {
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126 | attributes.setMetadata(tile.getTileSource().getMetadata(headers));
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127 | if (tile.getTileSource().isNoTileAtZoom(headers, statusCode, content)) {
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128 | attributes.setNoTileAtZoom(true);
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129 | return false; // do no try to load data from no-tile at zoom, cache empty object instead
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130 | }
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131 | return super.isResponseLoadable(headers, statusCode, content);
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132 | }
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133 |
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134 | @Override
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135 | protected boolean cacheAsEmpty() {
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136 | return isNoTileAtZoom() || super.cacheAsEmpty();
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137 | }
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138 |
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139 | @Override
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140 | public void submit(boolean force) {
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141 | tile.initLoading();
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142 | try {
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143 | super.submit(this, force);
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144 | } catch (IOException | IllegalArgumentException e) {
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145 | // if we fail to submit the job, mark tile as loaded and set error message
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146 | Logging.log(Logging.LEVEL_WARN, e);
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147 | tile.finishLoading();
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148 | tile.setError(e.getMessage());
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149 | }
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150 | }
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151 |
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152 | @Override
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153 | public void loadingFinished(CacheEntry object, CacheEntryAttributes attributes, LoadResult result) {
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154 | this.attributes = attributes; // as we might get notification from other object than our selfs, pass attributes along
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155 | Set<TileLoaderListener> listeners;
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156 | synchronized (inProgress) {
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157 | listeners = inProgress.remove(getCacheKey());
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158 | }
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159 | boolean status = result.equals(LoadResult.SUCCESS);
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160 |
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161 | try {
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162 | tile.finishLoading(); // whatever happened set that loading has finished
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163 | // set tile metadata
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164 | if (this.attributes != null) {
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165 | for (Entry<String, String> e: this.attributes.getMetadata().entrySet()) {
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166 | tile.putValue(e.getKey(), e.getValue());
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167 | }
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168 | }
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169 |
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170 | switch(result) {
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171 | case SUCCESS:
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172 | handleNoTileAtZoom();
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173 | if (attributes != null) {
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174 | int httpStatusCode = attributes.getResponseCode();
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175 | if (httpStatusCode >= 400 && !isNoTileAtZoom()) {
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176 | if (attributes.getErrorMessage() == null) {
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177 | tile.setError(tr("HTTP error {0} when loading tiles", httpStatusCode));
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178 | } else {
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179 | tile.setError(tr("Error downloading tiles: {0}", attributes.getErrorMessage()));
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180 | }
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181 | status = false;
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182 | }
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183 | }
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184 | status &= tryLoadTileImage(object); //try to keep returned image as background
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185 | break;
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186 | case FAILURE:
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187 | tile.setError("Problem loading tile");
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188 | tryLoadTileImage(object);
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189 | break;
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190 | case CANCELED:
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191 | tile.loadingCanceled();
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192 | // do nothing
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193 | }
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194 |
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195 | // always check, if there is some listener interested in fact, that tile has finished loading
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196 | if (listeners != null) { // listeners might be null, if some other thread notified already about success
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197 | for (TileLoaderListener l: listeners) {
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198 | l.tileLoadingFinished(tile, status);
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199 | }
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200 | }
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201 | } catch (IOException e) {
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202 | Logging.warn("JCS TMS - error loading object for tile {0}: {1}", new Object[] {tile.getKey(), e.getMessage()});
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203 | tile.setError(e);
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204 | tile.setLoaded(false);
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205 | if (listeners != null) { // listeners might be null, if some other thread notified already about success
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206 | for (TileLoaderListener l: listeners) {
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207 | l.tileLoadingFinished(tile, false);
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208 | }
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209 | }
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210 | }
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211 | }
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212 |
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213 | /**
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214 | * For TMS use BaseURL as settings discovery, so for different paths, we will have different settings (useful for developer servers)
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215 | *
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216 | * @return base URL of TMS or server url as defined in super class
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217 | */
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218 | @Override
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219 | protected String getServerKey() {
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220 | TileSource ts = tile.getSource();
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221 | if (ts instanceof AbstractTMSTileSource) {
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222 | return ((AbstractTMSTileSource) ts).getBaseUrl();
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223 | }
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224 | return super.getServerKey();
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225 | }
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226 |
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227 | @Override
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228 | protected BufferedImageCacheEntry createCacheEntry(byte[] content) {
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229 | return new BufferedImageCacheEntry(content);
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230 | }
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231 |
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232 | @Override
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233 | public void submit() {
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234 | submit(false);
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235 | }
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236 |
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237 | @Override
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238 | protected CacheEntryAttributes parseHeaders(HttpClient.Response urlConn) {
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239 | CacheEntryAttributes ret = super.parseHeaders(urlConn);
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240 | // keep the expiration time between MINIMUM_EXPIRES and MAXIMUM_EXPIRES, so we will cache the tiles
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241 | // at least for some short period of time, but not too long
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242 | if (ret.getExpirationTime() < now + MINIMUM_EXPIRES.get()) {
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243 | ret.setExpirationTime(now + MINIMUM_EXPIRES.get());
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244 | }
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245 | if (ret.getExpirationTime() > now + MAXIMUM_EXPIRES.get()) {
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246 | ret.setExpirationTime(now + MAXIMUM_EXPIRES.get());
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247 | }
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248 | return ret;
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249 | }
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250 |
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251 | private boolean handleNoTileAtZoom() {
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252 | if (isNoTileAtZoom()) {
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253 | Logging.debug("JCS TMS - Tile valid, but no file, as no tiles at this level {0}", tile);
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254 | tile.setError("No tile at this zoom level");
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255 | tile.putValue("tile-info", "no-tile");
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256 | return true;
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257 | }
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258 | return false;
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259 | }
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260 |
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261 | private boolean isNoTileAtZoom() {
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262 | if (attributes == null) {
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263 | Logging.warn("Cache attributes are null");
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264 | }
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265 | return attributes != null && attributes.isNoTileAtZoom();
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266 | }
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267 |
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268 | private boolean tryLoadTileImage(CacheEntry object) throws IOException {
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269 | if (object != null) {
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270 | byte[] content = object.getContent();
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271 | if (content.length > 0) {
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272 | tile.loadImage(new ByteArrayInputStream(content));
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273 | if (tile.getImage() == null) {
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274 | tile.setError(tr("Could not load image from tile server"));
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275 | return false;
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276 | }
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277 | }
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278 | }
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279 | return true;
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280 | }
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281 | }
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