1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.cache;
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3 |
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4 | import java.io.ByteArrayOutputStream;
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5 | import java.io.FileNotFoundException;
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6 | import java.io.IOException;
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7 | import java.io.InputStream;
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8 | import java.net.HttpURLConnection;
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9 | import java.net.URL;
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10 | import java.net.URLConnection;
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11 | import java.util.HashSet;
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12 | import java.util.List;
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13 | import java.util.Map;
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14 | import java.util.Random;
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15 | import java.util.Set;
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16 | import java.util.concurrent.ConcurrentHashMap;
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17 | import java.util.concurrent.ConcurrentMap;
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18 | import java.util.concurrent.Executors;
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19 | import java.util.concurrent.LinkedBlockingDeque;
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20 | import java.util.concurrent.ThreadFactory;
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21 | import java.util.concurrent.ThreadPoolExecutor;
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22 | import java.util.concurrent.TimeUnit;
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23 | import java.util.logging.Level;
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24 | import java.util.logging.Logger;
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25 |
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26 | import org.apache.commons.jcs.access.behavior.ICacheAccess;
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27 | import org.apache.commons.jcs.engine.behavior.ICacheElement;
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28 | import org.openstreetmap.gui.jmapviewer.FeatureAdapter;
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29 | import org.openstreetmap.josm.Main;
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30 | import org.openstreetmap.josm.data.cache.ICachedLoaderListener.LoadResult;
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31 | import org.openstreetmap.josm.data.preferences.IntegerProperty;
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32 |
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33 | /**
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34 | * @author Wiktor Niesiobędzki
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35 | *
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36 | * @param <K> cache entry key type
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37 | * @param <V> cache value type
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38 | *
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39 | * Generic loader for HTTP based tiles. Uses custom attribute, to check, if entry has expired
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40 | * according to HTTP headers sent with tile. If so, it tries to verify using Etags
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41 | * or If-Modified-Since / Last-Modified.
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42 | *
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43 | * If the tile is not valid, it will try to download it from remote service and put it
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44 | * to cache. If remote server will fail it will try to use stale entry.
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45 | *
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46 | * This class will keep only one Job running for specified tile. All others will just finish, but
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47 | * listeners will be gathered and notified, once download job will be finished
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48 | *
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49 | * @since 8168
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50 | */
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51 | public abstract class JCSCachedTileLoaderJob<K, V extends CacheEntry> implements ICachedLoaderJob<K>, Runnable {
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52 | private static final Logger log = FeatureAdapter.getLogger(JCSCachedTileLoaderJob.class.getCanonicalName());
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53 | protected static final long DEFAULT_EXPIRE_TIME = 1000L * 60 * 60 * 24 * 7; // 7 days
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54 | // Limit for the max-age value send by the server.
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55 | protected static final long EXPIRE_TIME_SERVER_LIMIT = 1000L * 60 * 60 * 24 * 28; // 4 weeks
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56 | // Absolute expire time limit. Cached tiles that are older will not be used,
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57 | // even if the refresh from the server fails.
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58 | protected static final long ABSOLUTE_EXPIRE_TIME_LIMIT = Long.MAX_VALUE; // unlimited
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59 |
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60 | /**
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61 | * maximum download threads that will be started
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62 | */
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63 | public static final IntegerProperty THREAD_LIMIT = new IntegerProperty("cache.jcs.max_threads", 10);
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64 |
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65 | /*
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66 | * ThreadPoolExecutor starts new threads, until THREAD_LIMIT is reached. Then it puts tasks into LinkedBlockingDeque.
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67 | *
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68 | * The queue works FIFO, so one needs to take care about ordering of the entries submitted
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69 | *
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70 | * There is no point in canceling tasks, that are already taken by worker threads (if we made so much effort, we can at least cache
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71 | * the response, so later it could be used). We could actually cancel what is in LIFOQueue, but this is a tradeoff between simplicity
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72 | * and performance (we do want to have something to offer to worker threads before tasks will be resubmitted by class consumer)
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73 | */
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74 |
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75 | private static ThreadPoolExecutor DEFAULT_DOWNLOAD_JOB_DISPATCHER = new ThreadPoolExecutor(
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76 | 2, // we have a small queue, so threads will be quickly started (threads are started only, when queue is full)
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77 | THREAD_LIMIT.get().intValue(), // do not this number of threads
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78 | 30, // keepalive for thread
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79 | TimeUnit.SECONDS,
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80 | // make queue of LIFO type - so recently requested tiles will be loaded first (assuming that these are which user is waiting to see)
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81 | new LinkedBlockingDeque<Runnable>(),
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82 | getNamedThreadFactory("JCS downloader")
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83 | );
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84 |
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85 | public static ThreadFactory getNamedThreadFactory(final String name) {
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86 | return new ThreadFactory(){
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87 | public Thread newThread(Runnable r) {
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88 | Thread t = Executors.defaultThreadFactory().newThread(r);
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89 | t.setName(name);
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90 | return t;
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91 | }
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92 | };
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93 | }
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94 |
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95 | private static ConcurrentMap<String,Set<ICachedLoaderListener>> inProgress = new ConcurrentHashMap<>();
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96 | private static ConcurrentMap<String, Boolean> useHead = new ConcurrentHashMap<>();
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97 |
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98 | private long now; // when the job started
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99 |
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100 | private ICacheAccess<K, V> cache;
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101 | private ICacheElement<K, V> cacheElement;
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102 | protected V cacheData = null;
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103 | protected CacheEntryAttributes attributes = null;
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104 |
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105 | // HTTP connection parameters
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106 | private int connectTimeout;
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107 | private int readTimeout;
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108 | private Map<String, String> headers;
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109 | private ThreadPoolExecutor downloadJobExecutor;
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110 | private Runnable finishTask;
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111 |
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112 | /**
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113 | * @param cache cache instance that we will work on
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114 | * @param headers
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115 | * @param readTimeout
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116 | * @param connectTimeout
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117 | * @param downloadJobExecutor
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118 | */
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119 | public JCSCachedTileLoaderJob(ICacheAccess<K,V> cache,
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120 | int connectTimeout, int readTimeout,
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121 | Map<String, String> headers,
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122 | ThreadPoolExecutor downloadJobExecutor) {
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123 |
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124 | this.cache = cache;
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125 | this.now = System.currentTimeMillis();
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126 | this.connectTimeout = connectTimeout;
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127 | this.readTimeout = readTimeout;
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128 | this.headers = headers;
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129 | this.downloadJobExecutor = downloadJobExecutor;
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130 | }
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131 |
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132 | /**
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133 | * @param cache cache instance that we will work on
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134 | * @param headers
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135 | * @param readTimeout
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136 | * @param connectTimeout
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137 | */
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138 | public JCSCachedTileLoaderJob(ICacheAccess<K, V> cache,
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139 | int connectTimeout, int readTimeout,
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140 | Map<String, String> headers) {
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141 | this(cache, connectTimeout, readTimeout,
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142 | headers, DEFAULT_DOWNLOAD_JOB_DISPATCHER);
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143 | }
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144 |
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145 | private void ensureCacheElement() {
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146 | if (cacheElement == null && getCacheKey() != null) {
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147 | cacheElement = cache.getCacheElement(getCacheKey());
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148 | if (cacheElement != null) {
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149 | attributes = (CacheEntryAttributes) cacheElement.getElementAttributes();
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150 | cacheData = cacheElement.getVal();
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151 | }
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152 | }
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153 | }
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154 |
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155 | public V get() {
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156 | ensureCacheElement();
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157 | return cacheData;
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158 | }
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159 |
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160 | @Override
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161 | public void submit(ICachedLoaderListener listener) {
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162 | boolean first = false;
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163 | URL url = getUrl();
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164 | String deduplicationKey = null;
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165 | if (url != null) {
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166 | // url might be null, for example when Bing Attribution is not loaded yet
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167 | deduplicationKey = url.toString();
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168 | }
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169 | if (deduplicationKey == null) {
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170 | log.log(Level.WARNING, "No url returned for: {0}, skipping", getCacheKey());
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171 | return;
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172 | }
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173 | synchronized (inProgress) {
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174 | Set<ICachedLoaderListener> newListeners = inProgress.get(deduplicationKey);
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175 | if (newListeners == null) {
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176 | newListeners = new HashSet<>();
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177 | inProgress.put(deduplicationKey, newListeners);
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178 | first = true;
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179 | }
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180 | newListeners.add(listener);
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181 | }
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182 |
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183 | if (first) {
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184 | ensureCacheElement();
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185 | if (cacheElement != null && isCacheElementValid() && (isObjectLoadable())) {
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186 | // we got something in cache, and it's valid, so lets return it
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187 | log.log(Level.FINE, "JCS - Returning object from cache: {0}", getCacheKey());
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188 | finishLoading(LoadResult.SUCCESS);
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189 | return;
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190 | }
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191 | // object not in cache, so submit work to separate thread
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192 | getDownloadExecutor().execute(this);
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193 | }
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194 | }
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195 |
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196 | /**
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197 | * This method is run when job has finished
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198 | */
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199 | protected void executionFinished() {
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200 | if (finishTask != null) {
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201 | finishTask.run();
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202 | }
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203 | }
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204 |
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205 | /**
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206 | *
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207 | * @return checks if object from cache has sufficient data to be returned
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208 | */
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209 | protected boolean isObjectLoadable() {
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210 | byte[] content = cacheData.getContent();
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211 | return content != null && content.length > 0;
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212 | }
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213 |
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214 | /**
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215 | *
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216 | * @return cache object as empty, regardless of what remote resource has returned (ex. based on headers)
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217 | */
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218 | protected boolean cacheAsEmpty(Map<String, List<String>> headers, int statusCode, byte[] content) {
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219 | return false;
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220 | }
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221 |
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222 | /**
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223 | * @return key under which discovered server settings will be kept
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224 | */
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225 | protected String getServerKey() {
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226 | return getUrl().getHost();
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227 | }
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228 |
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229 | /**
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230 | * this needs to be non-static, so it can be overridden by subclasses
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231 | */
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232 | protected ThreadPoolExecutor getDownloadExecutor() {
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233 | return downloadJobExecutor;
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234 | }
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235 |
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236 | public void run() {
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237 | final Thread currentThread = Thread.currentThread();
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238 | final String oldName = currentThread.getName();
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239 | currentThread.setName("JCS Downloading: " + getUrl());
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240 | try {
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241 | // try to load object from remote resource
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242 | if (loadObject()) {
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243 | finishLoading(LoadResult.SUCCESS);
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244 | } else {
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245 | // if loading failed - check if we can return stale entry
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246 | if (isObjectLoadable()) {
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247 | // try to get stale entry in cache
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248 | finishLoading(LoadResult.SUCCESS);
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249 | log.log(Level.FINE, "JCS - found stale object in cache: {0}", getUrl());
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250 | } else {
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251 | // failed completely
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252 | finishLoading(LoadResult.FAILURE);
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253 | }
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254 | }
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255 | } finally {
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256 | executionFinished();
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257 | currentThread.setName(oldName);
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258 | }
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259 | }
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260 |
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261 |
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262 | private void finishLoading(LoadResult result) {
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263 | Set<ICachedLoaderListener> listeners = null;
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264 | synchronized (inProgress) {
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265 | listeners = inProgress.remove(getUrl().toString());
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266 | }
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267 | if (listeners == null) {
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268 | log.log(Level.WARNING, "Listener not found for URL: {0}. Listener not notified!", getUrl());
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269 | return;
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270 | }
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271 | try {
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272 | for (ICachedLoaderListener l: listeners) {
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273 | l.loadingFinished(cacheData, attributes, result);
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274 | }
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275 | } catch (Exception e) {
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276 | log.log(Level.WARNING, "JCS - Error while loading object from cache: {0}; {1}", new Object[]{e.getMessage(), getUrl()});
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277 | Main.warn(e);
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278 | for (ICachedLoaderListener l: listeners) {
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279 | l.loadingFinished(cacheData, attributes, LoadResult.FAILURE);
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280 | }
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281 |
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282 | }
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283 |
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284 | }
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285 |
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286 | private boolean isCacheElementValid() {
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287 | long expires = attributes.getExpirationTime();
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288 |
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289 | // check by expire date set by server
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290 | if (expires != 0L) {
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291 | // put a limit to the expire time (some servers send a value
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292 | // that is too large)
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293 | expires = Math.min(expires, attributes.getCreateTime() + EXPIRE_TIME_SERVER_LIMIT);
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294 | if (now > expires) {
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295 | log.log(Level.FINE, "JCS - Object {0} has expired -> valid to {1}, now is: {2}", new Object[]{getUrl(), Long.toString(expires), Long.toString(now)});
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296 | return false;
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297 | }
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298 | } else {
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299 | // check by file modification date
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300 | if (now - attributes.getLastModification() > DEFAULT_EXPIRE_TIME) {
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301 | log.log(Level.FINE, "JCS - Object has expired, maximum file age reached {0}", getUrl());
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302 | return false;
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303 | }
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304 | }
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305 | return true;
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306 | }
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307 |
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308 | /**
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309 | * @return true if object was successfully downloaded, false, if there was a loading failure
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310 | */
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311 |
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312 | private boolean loadObject() {
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313 | try {
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314 | // if we have object in cache, and host doesn't support If-Modified-Since nor If-None-Match
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315 | // then just use HEAD request and check returned values
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316 | if (isObjectLoadable() &&
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317 | Boolean.TRUE.equals(useHead.get(getServerKey())) &&
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318 | isCacheValidUsingHead()) {
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319 | log.log(Level.FINE, "JCS - cache entry verified using HEAD request: {0}", getUrl());
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320 | return true;
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321 | }
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322 |
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323 | HttpURLConnection urlConn = getURLConnection();
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324 |
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325 | if (isObjectLoadable() &&
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326 | (now - attributes.getLastModification()) <= ABSOLUTE_EXPIRE_TIME_LIMIT) {
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327 | urlConn.setIfModifiedSince(attributes.getLastModification());
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328 | }
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329 | if (isObjectLoadable() && attributes.getEtag() != null) {
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330 | urlConn.addRequestProperty("If-None-Match", attributes.getEtag());
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331 | }
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332 | if (urlConn.getResponseCode() == 304) {
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333 | // If isModifiedSince or If-None-Match has been set
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334 | // and the server answers with a HTTP 304 = "Not Modified"
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335 | log.log(Level.FINE, "JCS - IfModifiedSince/Etag test: local version is up to date: {0}", getUrl());
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336 | return true;
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337 | } else if (isObjectLoadable()) {
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338 | // we have an object in cache, but we haven't received 304 resposne code
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339 | // check if we should use HEAD request to verify
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340 | if((attributes.getEtag() != null && attributes.getEtag().equals(urlConn.getRequestProperty("ETag"))) ||
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341 | attributes.getLastModification() == urlConn.getLastModified()) {
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342 | // we sent ETag or If-Modified-Since, but didn't get 304 response code
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343 | // for further requests - use HEAD
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344 | String serverKey = getServerKey();
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345 | log.log(Level.INFO, "JCS - Host: {0} found not to return 304 codes for If-Modifed-Since or If-None-Match headers", serverKey);
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346 | useHead.put(serverKey, Boolean.TRUE);
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347 | }
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348 | }
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349 |
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350 | attributes = parseHeaders(urlConn);
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351 |
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352 | for (int i = 0; i < 5; ++i) {
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353 | if (urlConn.getResponseCode() == 503) {
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354 | Thread.sleep(5000+(new Random()).nextInt(5000));
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355 | continue;
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356 | }
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357 |
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358 | attributes.setResponseCode(urlConn.getResponseCode());
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359 | byte[] raw = read(urlConn);
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360 |
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361 | if (!cacheAsEmpty(urlConn.getHeaderFields(), urlConn.getResponseCode(), raw) &&
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362 | raw != null && raw.length > 0) {
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363 | // we need to check cacheEmpty, so for cases, when data is returned, but we want to store
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364 | // as empty (eg. empty tile images) to save some space
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365 | cacheData = createCacheEntry(raw);
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366 | cache.put(getCacheKey(), cacheData, attributes);
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367 | log.log(Level.FINE, "JCS - downloaded key: {0}, length: {1}, url: {2}",
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368 | new Object[] {getCacheKey(), raw.length, getUrl()});
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369 | return true;
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370 | } else {
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371 | cacheData = createCacheEntry(new byte[]{});
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372 | cache.put(getCacheKey(), cacheData, attributes);
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373 | log.log(Level.FINE, "JCS - Caching empty object {0}", getUrl());
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374 | return true;
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375 | }
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376 | }
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377 | } catch (FileNotFoundException e) {
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378 | log.log(Level.FINE, "JCS - Caching empty object as server returned 404 for: {0}", getUrl());
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379 | cache.put(getCacheKey(), createCacheEntry(new byte[]{}), attributes);
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380 | return handleNotFound();
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381 | } catch (Exception e) {
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382 | log.log(Level.WARNING, "JCS - Exception during download {0}", getUrl());
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383 | Main.warn(e);
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384 | }
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385 | log.log(Level.WARNING, "JCS - Silent failure during download: {0}", getUrl());
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386 | return false;
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387 |
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388 | }
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389 |
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390 | /**
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391 | * @return if we should treat this object as properly loaded
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392 | */
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393 | protected abstract boolean handleNotFound();
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394 |
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395 | protected abstract V createCacheEntry(byte[] content);
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396 |
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397 | private CacheEntryAttributes parseHeaders(URLConnection urlConn) {
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398 | CacheEntryAttributes ret = new CacheEntryAttributes();
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399 |
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400 | Long lng = urlConn.getExpiration();
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401 | if (lng.equals(0L)) {
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402 | try {
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403 | String str = urlConn.getHeaderField("Cache-Control");
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404 | if (str != null) {
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405 | for (String token: str.split(",")) {
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406 | if (token.startsWith("max-age=")) {
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407 | lng = Long.parseLong(token.substring(8)) * 1000 +
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408 | System.currentTimeMillis();
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409 | }
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410 | }
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411 | }
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412 | } catch (NumberFormatException e) {
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413 | // ignore malformed Cache-Control headers
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414 | }
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415 | }
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416 |
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417 | ret.setExpirationTime(lng);
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418 | ret.setLastModification(now);
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419 | ret.setEtag(urlConn.getHeaderField("ETag"));
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420 | return ret;
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421 | }
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422 |
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423 | private HttpURLConnection getURLConnection() throws IOException {
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424 | HttpURLConnection urlConn = (HttpURLConnection) getUrl().openConnection();
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425 | urlConn.setRequestProperty("Accept", "text/html, image/png, image/jpeg, image/gif, */*");
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426 | urlConn.setReadTimeout(readTimeout); // 30 seconds read timeout
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427 | urlConn.setConnectTimeout(connectTimeout);
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428 | for(Map.Entry<String, String> e: headers.entrySet()) {
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429 | urlConn.setRequestProperty(e.getKey(), e.getValue());
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430 | }
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431 | return urlConn;
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432 | }
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433 |
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434 | private boolean isCacheValidUsingHead() throws IOException {
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435 | HttpURLConnection urlConn = (HttpURLConnection) getUrl().openConnection();
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436 | urlConn.setRequestMethod("HEAD");
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437 | long lastModified = urlConn.getLastModified();
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438 | return (attributes.getEtag() != null && attributes.getEtag().equals(urlConn.getRequestProperty("ETag"))) ||
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439 | (lastModified != 0 && lastModified <= attributes.getLastModification());
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440 | }
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441 |
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442 | private static byte[] read(URLConnection urlConn) throws IOException {
|
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443 | InputStream input = urlConn.getInputStream();
|
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444 | try {
|
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445 | ByteArrayOutputStream bout = new ByteArrayOutputStream(input.available());
|
---|
446 | byte[] buffer = new byte[2048];
|
---|
447 | boolean finished = false;
|
---|
448 | do {
|
---|
449 | int read = input.read(buffer);
|
---|
450 | if (read >= 0) {
|
---|
451 | bout.write(buffer, 0, read);
|
---|
452 | } else {
|
---|
453 | finished = true;
|
---|
454 | }
|
---|
455 | } while (!finished);
|
---|
456 | if (bout.size() == 0)
|
---|
457 | return null;
|
---|
458 | return bout.toByteArray();
|
---|
459 | } finally {
|
---|
460 | input.close();
|
---|
461 | }
|
---|
462 | }
|
---|
463 |
|
---|
464 | /**
|
---|
465 | * TODO: move to JobFactory
|
---|
466 | * cancels all outstanding tasks in the queue.
|
---|
467 | */
|
---|
468 | public void cancelOutstandingTasks() {
|
---|
469 | ThreadPoolExecutor downloadExecutor = getDownloadExecutor();
|
---|
470 | for(Runnable r: downloadExecutor.getQueue()) {
|
---|
471 | if (downloadExecutor.remove(r)) {
|
---|
472 | if (r instanceof JCSCachedTileLoaderJob) {
|
---|
473 | ((JCSCachedTileLoaderJob<?, ?>) r).handleJobCancellation();
|
---|
474 | }
|
---|
475 | }
|
---|
476 | }
|
---|
477 | }
|
---|
478 |
|
---|
479 | /**
|
---|
480 | * Sets a job, that will be run, when job will finish execution
|
---|
481 | * @param runnable that will be executed
|
---|
482 | */
|
---|
483 | public void setFinishedTask(Runnable runnable) {
|
---|
484 | this.finishTask = runnable;
|
---|
485 |
|
---|
486 | }
|
---|
487 |
|
---|
488 | /**
|
---|
489 | * Marks this job as canceled
|
---|
490 | */
|
---|
491 | public void handleJobCancellation() {
|
---|
492 | finishLoading(LoadResult.CANCELED);
|
---|
493 | }
|
---|
494 | }
|
---|