[8168] | 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.MalformedURLException;
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[8174] | 10 | import java.net.URL;
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[8168] | 11 | import java.net.URLConnection;
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| 12 | import java.util.HashSet;
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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.Executor;
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| 19 | import java.util.concurrent.LinkedBlockingDeque;
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| 20 | import java.util.concurrent.RejectedExecutionException;
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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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[8176] | 29 | import org.openstreetmap.josm.data.cache.ICachedLoaderListener.LoadResult;
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[8168] | 30 | import org.openstreetmap.josm.data.preferences.IntegerProperty;
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| 31 |
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| 32 | /**
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| 33 | * @author Wiktor Niesiobędzki
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| 34 | *
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| 35 | * @param <K> cache entry key type
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| 36 | *
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| 37 | * Generic loader for HTTP based tiles. Uses custom attribute, to check, if entry has expired
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| 38 | * according to HTTP headers sent with tile. If so, it tries to verify using Etags
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| 39 | * or If-Modified-Since / Last-Modified.
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| 40 | *
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| 41 | * If the tile is not valid, it will try to download it from remote service and put it
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| 42 | * to cache. If remote server will fail it will try to use stale entry.
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| 43 | *
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| 44 | * This class will keep only one Job running for specified tile. All others will just finish, but
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| 45 | * listeners will be gathered and notified, once download job will be finished
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| 46 | */
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| 47 | public abstract class JCSCachedTileLoaderJob<K, V extends CacheEntry> implements ICachedLoaderJob<K>, Runnable {
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| 48 | private static final Logger log = FeatureAdapter.getLogger(JCSCachedTileLoaderJob.class.getCanonicalName());
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| 49 | protected static final long DEFAULT_EXPIRE_TIME = 1000L * 60 * 60 * 24 * 7; // 7 days
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| 50 | // Limit for the max-age value send by the server.
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| 51 | protected static final long EXPIRE_TIME_SERVER_LIMIT = 1000L * 60 * 60 * 24 * 28; // 4 weeks
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| 52 | // Absolute expire time limit. Cached tiles that are older will not be used,
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| 53 | // even if the refresh from the server fails.
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| 54 | protected static final long ABSOLUTE_EXPIRE_TIME_LIMIT = Long.MAX_VALUE; // unlimited
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| 55 |
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| 56 | /**
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| 57 | * maximum download threads that will be started
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| 58 | */
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| 59 | public static IntegerProperty THREAD_LIMIT = new IntegerProperty("cache.jcs.max_threads", 10);
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| 60 | private static Executor DOWNLOAD_JOB_DISPATCHER = new ThreadPoolExecutor(
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| 61 | 2, // we have a small queue, so threads will be quickly started (threads are started only, when queue is full)
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| 62 | THREAD_LIMIT.get().intValue(), // do not this number of threads
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| 63 | 30, // keepalive for thread
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| 64 | TimeUnit.SECONDS,
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| 65 | // 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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| 66 | new LinkedBlockingDeque<Runnable>(5) {
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| 67 | /* keep the queue size fairly small, we do not want to
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| 68 | download a lot of tiles, that user is not seeing anyway */
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| 69 | @Override
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| 70 | public boolean offer(Runnable t) {
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| 71 | return super.offerFirst(t);
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| 72 | }
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| 73 |
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| 74 | @Override
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| 75 | public Runnable remove() {
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| 76 | return super.removeFirst();
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| 77 | }
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| 78 | }
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| 79 | );
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| 80 | private static ConcurrentMap<String,Set<ICachedLoaderListener>> inProgress = new ConcurrentHashMap<>();
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| 81 | private static ConcurrentMap<String, Boolean> useHead = new ConcurrentHashMap<>();
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| 82 |
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| 83 | private long now; // when the job started
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| 84 |
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| 85 | private ICacheAccess<K, V> cache;
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| 86 | private ICacheElement<K, V> cacheElement;
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| 87 | protected V cacheData = null;
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| 88 | protected CacheEntryAttributes attributes = null;
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| 89 |
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| 90 | // HTTP connection parameters
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| 91 | private int connectTimeout;
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| 92 | private int readTimeout;
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| 93 | private Map<String, String> headers;
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| 94 |
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| 95 | /**
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| 96 | * @param cache cache instance that we will work on
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| 97 | * @param headers
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| 98 | * @param readTimeout
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| 99 | * @param connectTimeout
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| 100 | */
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| 101 | public JCSCachedTileLoaderJob(ICacheAccess<K,V> cache,
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| 102 | int connectTimeout, int readTimeout,
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| 103 | Map<String, String> headers) {
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| 104 |
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| 105 | this.cache = cache;
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| 106 | this.now = System.currentTimeMillis();
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| 107 | this.connectTimeout = connectTimeout;
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| 108 | this.readTimeout = readTimeout;
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| 109 | this.headers = headers;
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| 110 | }
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| 111 |
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| 112 | private void ensureCacheElement() {
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| 113 | if (cacheElement == null && getCacheKey() != null) {
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| 114 | cacheElement = cache.getCacheElement(getCacheKey());
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| 115 | if (cacheElement != null) {
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| 116 | attributes = (CacheEntryAttributes) cacheElement.getElementAttributes();
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| 117 | cacheData = cacheElement.getVal();
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| 118 | }
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| 119 | }
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| 120 | }
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| 121 |
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| 122 | public V get() {
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| 123 | ensureCacheElement();
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| 124 | return cacheData;
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| 125 | }
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| 126 |
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| 127 | @Override
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| 128 | public void submit(ICachedLoaderListener listener) {
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| 129 | boolean first = false;
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[8174] | 130 | URL url = getUrl();
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| 131 | String deduplicationKey = null;
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| 132 | if (url != null) {
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| 133 | // url might be null, for example when Bing Attribution is not loaded yet
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| 134 | deduplicationKey = url.toString();
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| 135 | }
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| 136 | if (deduplicationKey == null) {
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[8168] | 137 | log.log(Level.WARNING, "No url returned for: {0}, skipping", getCacheKey());
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| 138 | return;
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| 139 | }
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| 140 | synchronized (inProgress) {
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[8174] | 141 | Set<ICachedLoaderListener> newListeners = inProgress.get(deduplicationKey);
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[8168] | 142 | if (newListeners == null) {
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| 143 | newListeners = new HashSet<>();
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[8174] | 144 | inProgress.put(deduplicationKey, newListeners);
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[8168] | 145 | first = true;
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| 146 | }
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| 147 | newListeners.add(listener);
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| 148 | }
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| 149 |
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| 150 | if (first) {
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| 151 | ensureCacheElement();
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| 152 | if (cacheElement != null && isCacheElementValid() && (isObjectLoadable())) {
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| 153 | // we got something in cache, and it's valid, so lets return it
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| 154 | log.log(Level.FINE, "JCS - Returning object from cache: {0}", getCacheKey());
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[8176] | 155 | finishLoading(LoadResult.SUCCESS);
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[8168] | 156 | return;
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| 157 | }
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| 158 | // object not in cache, so submit work to separate thread
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| 159 | try {
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| 160 | // use getter method, so subclasses may override executors, to get separate thread pool
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| 161 | getDownloadExecutor().execute(JCSCachedTileLoaderJob.this);
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| 162 | } catch (RejectedExecutionException e) {
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| 163 | // queue was full, try again later
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| 164 | log.log(Level.FINE, "JCS - rejected job for: {0}", getCacheKey());
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[8176] | 165 | finishLoading(LoadResult.REJECTED);
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[8168] | 166 | }
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| 167 | }
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| 168 | }
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| 169 |
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| 170 | /**
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[8174] | 171 | *
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[8168] | 172 | * @return checks if object from cache has sufficient data to be returned
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| 173 | */
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| 174 | protected boolean isObjectLoadable() {
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| 175 | byte[] content = cacheData.getContent();
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| 176 | return content != null && content.length > 0;
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| 177 | }
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| 178 |
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| 179 | /**
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[8174] | 180 | *
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[8168] | 181 | * @return cache object as empty, regardless of what remote resource has returned (ex. based on headers)
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| 182 | */
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| 183 | protected boolean cacheAsEmpty() {
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| 184 | return false;
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| 185 | }
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| 186 |
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| 187 | /**
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| 188 | * @return key under which discovered server settings will be kept
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| 189 | */
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| 190 | protected String getServerKey() {
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| 191 | return getUrl().getHost();
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| 192 | }
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| 193 |
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| 194 | /**
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| 195 | * this needs to be non-static, so it can be overridden by subclasses
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| 196 | */
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| 197 | protected Executor getDownloadExecutor() {
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| 198 | return DOWNLOAD_JOB_DISPATCHER;
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| 199 | }
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| 200 |
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| 201 |
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| 202 | public void run() {
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| 203 | final Thread currentThread = Thread.currentThread();
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| 204 | final String oldName = currentThread.getName();
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| 205 | currentThread.setName("JCS Downloading: " + getUrl());
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| 206 | try {
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| 207 | // try to load object from remote resource
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| 208 | if (loadObject()) {
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[8176] | 209 | finishLoading(LoadResult.SUCCESS);
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[8168] | 210 | } else {
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| 211 | // if loading failed - check if we can return stale entry
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| 212 | if (isObjectLoadable()) {
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| 213 | // try to get stale entry in cache
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[8176] | 214 | finishLoading(LoadResult.SUCCESS);
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[8168] | 215 | log.log(Level.FINE, "JCS - found stale object in cache: {0}", getUrl());
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| 216 | } else {
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| 217 | // failed completely
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[8176] | 218 | finishLoading(LoadResult.FAILURE);
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[8168] | 219 | }
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| 220 | }
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| 221 | } finally {
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| 222 | currentThread.setName(oldName);
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| 223 | }
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| 224 | }
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| 225 |
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| 226 |
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[8176] | 227 | private void finishLoading(LoadResult result) {
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[8168] | 228 | Set<ICachedLoaderListener> listeners = null;
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| 229 | synchronized (inProgress) {
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| 230 | listeners = inProgress.remove(getUrl().toString());
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| 231 | }
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| 232 | if (listeners == null) {
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| 233 | log.log(Level.WARNING, "Listener not found for URL: {0}. Listener not notified!", getUrl());
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| 234 | return;
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| 235 | }
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| 236 | try {
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| 237 | for (ICachedLoaderListener l: listeners) {
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[8176] | 238 | l.loadingFinished(cacheData, result);
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[8168] | 239 | }
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| 240 | } catch (Exception e) {
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| 241 | log.log(Level.WARNING, "JCS - Error while loading object from cache: {0}; {1}", new Object[]{e.getMessage(), getUrl()});
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| 242 | log.log(Level.FINE, "Stacktrace", e);
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| 243 | for (ICachedLoaderListener l: listeners) {
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[8176] | 244 | l.loadingFinished(cacheData, LoadResult.FAILURE);
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[8168] | 245 | }
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| 246 |
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| 247 | }
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| 248 |
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| 249 | }
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| 250 |
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| 251 | private boolean isCacheElementValid() {
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| 252 | long expires = attributes.getExpirationTime();
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| 253 |
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| 254 | // check by expire date set by server
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| 255 | if (expires != 0L) {
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| 256 | // put a limit to the expire time (some servers send a value
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| 257 | // that is too large)
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| 258 | expires = Math.min(expires, attributes.getCreateTime() + EXPIRE_TIME_SERVER_LIMIT);
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| 259 | if (now > expires) {
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| 260 | 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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| 261 | return false;
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| 262 | }
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| 263 | } else {
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| 264 | // check by file modification date
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| 265 | if (now - attributes.getLastModification() > DEFAULT_EXPIRE_TIME) {
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| 266 | log.log(Level.FINE, "JCS - Object has expired, maximum file age reached {0}", getUrl());
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| 267 | return false;
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| 268 | }
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| 269 | }
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| 270 | return true;
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| 271 | }
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| 272 |
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[8174] | 273 | /**
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| 274 | * @return true if object was successfully downloaded, false, if there was a loading failure
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| 275 | */
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| 276 |
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[8168] | 277 | private boolean loadObject() {
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| 278 | try {
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| 279 | // if we have object in cache, and host doesn't support If-Modified-Since nor If-None-Match
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| 280 | // then just use HEAD request and check returned values
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| 281 | if (isObjectLoadable() &&
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| 282 | Boolean.TRUE.equals(useHead.get(getServerKey())) &&
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| 283 | isCacheValidUsingHead()) {
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| 284 | log.log(Level.FINE, "JCS - cache entry verified using HEAD request: {0}", getUrl());
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| 285 | return true;
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| 286 | }
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| 287 | URLConnection urlConn = getURLConnection();
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| 288 |
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| 289 | if (isObjectLoadable() &&
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| 290 | (now - attributes.getLastModification()) <= ABSOLUTE_EXPIRE_TIME_LIMIT) {
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| 291 | urlConn.setIfModifiedSince(attributes.getLastModification());
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| 292 | }
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| 293 | if (isObjectLoadable() && attributes.getEtag() != null) {
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| 294 | urlConn.addRequestProperty("If-None-Match", attributes.getEtag());
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| 295 | }
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| 296 | if (urlConn instanceof HttpURLConnection && ((HttpURLConnection)urlConn).getResponseCode() == 304) {
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| 297 | // If isModifiedSince or If-None-Match has been set
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| 298 | // and the server answers with a HTTP 304 = "Not Modified"
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| 299 | log.log(Level.FINE, "JCS - IfModifiedSince/Etag test: local version is up to date: {0}", getUrl());
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| 300 | return true;
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| 301 | } else if (isObjectLoadable()) {
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| 302 | // we have an object in cache, but we haven't received 304 resposne code
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| 303 | // check if we should use HEAD request to verify
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| 304 | if((attributes.getEtag() != null && attributes.getEtag().equals(urlConn.getRequestProperty("ETag"))) ||
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| 305 | attributes.getLastModification() == urlConn.getLastModified()) {
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| 306 | // we sent ETag or If-Modified-Since, but didn't get 304 response code
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| 307 | // for further requests - use HEAD
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| 308 | String serverKey = getServerKey();
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| 309 | 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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| 310 | useHead.put(serverKey, Boolean.TRUE);
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| 311 | }
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| 312 | }
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| 313 |
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| 314 | attributes = parseHeaders(urlConn);
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| 315 |
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| 316 | for (int i = 0; i < 5; ++i) {
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| 317 | if (urlConn instanceof HttpURLConnection && ((HttpURLConnection)urlConn).getResponseCode() == 503) {
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| 318 | Thread.sleep(5000+(new Random()).nextInt(5000));
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| 319 | continue;
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| 320 | }
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| 321 | byte[] raw = read(urlConn);
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| 322 |
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| 323 | if (!cacheAsEmpty() && raw != null && raw.length > 0) {
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| 324 | cacheData = createCacheEntry(raw);
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| 325 | cache.put(getCacheKey(), cacheData, attributes);
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| 326 | log.log(Level.FINE, "JCS - downloaded key: {0}, length: {1}, url: {2}",
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| 327 | new Object[] {getCacheKey(), raw.length, getUrl()});
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| 328 | return true;
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[8174] | 329 | } else {
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[8168] | 330 | cacheData = createCacheEntry(new byte[]{});
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| 331 | cache.put(getCacheKey(), cacheData, attributes);
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| 332 | log.log(Level.FINE, "JCS - Caching empty object {0}", getUrl());
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| 333 | return true;
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| 334 | }
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| 335 | }
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| 336 | } catch (FileNotFoundException e) {
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| 337 | log.log(Level.FINE, "JCS - Caching empty object as server returned 404 for: {0}", getUrl());
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| 338 | cache.put(getCacheKey(), createCacheEntry(new byte[]{}), attributes);
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[8174] | 339 | return handleNotFound();
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[8168] | 340 | } catch (Exception e) {
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| 341 | log.log(Level.WARNING, "JCS - Exception during download " + getUrl(), e);
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| 342 | }
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| 343 | log.log(Level.WARNING, "JCS - Silent failure during download: {0}", getUrl());
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| 344 | return false;
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| 345 |
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| 346 | }
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| 347 |
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[8174] | 348 | /**
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| 349 | * @return if we should treat this object as properly loaded
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| 350 | */
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| 351 | protected abstract boolean handleNotFound();
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[8168] | 352 |
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| 353 | protected abstract V createCacheEntry(byte[] content);
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| 354 |
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| 355 | private CacheEntryAttributes parseHeaders(URLConnection urlConn) {
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| 356 | CacheEntryAttributes ret = new CacheEntryAttributes();
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| 357 | ret.setNoTileAtZoom("no-tile".equals(urlConn.getHeaderField("X-VE-Tile-Info")));
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| 358 |
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| 359 | Long lng = urlConn.getExpiration();
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| 360 | if (lng.equals(0L)) {
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| 361 | try {
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| 362 | String str = urlConn.getHeaderField("Cache-Control");
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| 363 | if (str != null) {
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| 364 | for (String token: str.split(",")) {
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| 365 | if (token.startsWith("max-age=")) {
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| 366 | lng = Long.parseLong(token.substring(8)) * 1000 +
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| 367 | System.currentTimeMillis();
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| 368 | }
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| 369 | }
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| 370 | }
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| 371 | } catch (NumberFormatException e) {} //ignore malformed Cache-Control headers
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| 372 | }
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| 373 |
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| 374 | ret.setExpirationTime(lng);
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| 375 | ret.setLastModification(now);
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| 376 | ret.setEtag(urlConn.getHeaderField("ETag"));
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| 377 | return ret;
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| 378 | }
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| 379 |
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| 380 | private HttpURLConnection getURLConnection() throws IOException, MalformedURLException {
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| 381 | HttpURLConnection urlConn = (HttpURLConnection) getUrl().openConnection();
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| 382 | urlConn.setRequestProperty("Accept", "text/html, image/png, image/jpeg, image/gif, */*");
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| 383 | urlConn.setReadTimeout(readTimeout); // 30 seconds read timeout
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| 384 | urlConn.setConnectTimeout(connectTimeout);
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| 385 | for(Map.Entry<String, String> e: headers.entrySet()) {
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| 386 | urlConn.setRequestProperty(e.getKey(), e.getValue());
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| 387 | }
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| 388 | return urlConn;
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| 389 | }
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| 390 |
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| 391 | private boolean isCacheValidUsingHead() throws IOException {
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| 392 | HttpURLConnection urlConn = (HttpURLConnection) getUrl().openConnection();
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| 393 | urlConn.setRequestMethod("HEAD");
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| 394 | long lastModified = urlConn.getLastModified();
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| 395 | return (
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| 396 | (attributes.getEtag() != null && attributes.getEtag().equals(urlConn.getRequestProperty("ETag"))) ||
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| 397 | (lastModified != 0 && lastModified <= attributes.getLastModification())
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| 398 | );
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| 399 | }
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| 400 |
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| 401 | private static byte[] read(URLConnection urlConn) throws IOException {
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| 402 | InputStream input = urlConn.getInputStream();
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| 403 | try {
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| 404 | ByteArrayOutputStream bout = new ByteArrayOutputStream(input.available());
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| 405 | byte[] buffer = new byte[2048];
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| 406 | boolean finished = false;
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| 407 | do {
|
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| 408 | int read = input.read(buffer);
|
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| 409 | if (read >= 0) {
|
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| 410 | bout.write(buffer, 0, read);
|
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| 411 | } else {
|
---|
| 412 | finished = true;
|
---|
| 413 | }
|
---|
| 414 | } while (!finished);
|
---|
| 415 | if (bout.size() == 0)
|
---|
| 416 | return null;
|
---|
| 417 | return bout.toByteArray();
|
---|
| 418 | } finally {
|
---|
| 419 | input.close();
|
---|
| 420 | }
|
---|
| 421 | }
|
---|
| 422 | }
|
---|