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.File;
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5 | import java.io.FileOutputStream;
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6 | import java.io.IOException;
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7 | import java.nio.channels.FileLock;
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8 | import java.util.Properties;
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9 | import java.util.logging.Handler;
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10 | import java.util.logging.Level;
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11 | import java.util.logging.LogRecord;
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12 | import java.util.logging.Logger;
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13 | import java.util.logging.SimpleFormatter;
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14 |
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15 | import org.apache.commons.jcs.access.CacheAccess;
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16 | import org.apache.commons.jcs.auxiliary.AuxiliaryCache;
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17 | import org.apache.commons.jcs.auxiliary.AuxiliaryCacheFactory;
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18 | import org.apache.commons.jcs.auxiliary.disk.behavior.IDiskCacheAttributes;
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19 | import org.apache.commons.jcs.auxiliary.disk.block.BlockDiskCacheAttributes;
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20 | import org.apache.commons.jcs.auxiliary.disk.block.BlockDiskCacheFactory;
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21 | import org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributes;
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22 | import org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory;
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23 | import org.apache.commons.jcs.engine.CompositeCacheAttributes;
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24 | import org.apache.commons.jcs.engine.behavior.ICompositeCacheAttributes.DiskUsagePattern;
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25 | import org.apache.commons.jcs.engine.control.CompositeCache;
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26 | import org.apache.commons.jcs.engine.control.CompositeCacheManager;
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27 | import org.apache.commons.jcs.utils.serialization.StandardSerializer;
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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.preferences.BooleanProperty;
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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 | * Wrapper class for JCS Cache. Sets some sane environment and returns instances of cache objects.
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37 | * Static configuration for now assumes some small LRU cache in memory and larger LRU cache on disk
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38 | * @since 8168
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39 | */
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40 | public final class JCSCacheManager {
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41 | private static final Logger LOG = FeatureAdapter.getLogger(JCSCacheManager.class.getCanonicalName());
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42 |
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43 | private static volatile CompositeCacheManager cacheManager;
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44 | private static long maxObjectTTL = -1;
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45 | private static final String PREFERENCE_PREFIX = "jcs.cache";
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46 | private static BooleanProperty USE_BLOCK_CACHE = new BooleanProperty(PREFERENCE_PREFIX + ".use_block_cache", true);
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47 |
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48 | private static final AuxiliaryCacheFactory diskCacheFactory =
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49 | USE_BLOCK_CACHE.get() ? new BlockDiskCacheFactory() : new IndexedDiskCacheFactory();
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50 | private static FileLock cacheDirLock;
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51 |
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52 | /**
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53 | * default objects to be held in memory by JCS caches (per region)
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54 | */
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55 | public static final IntegerProperty DEFAULT_MAX_OBJECTS_IN_MEMORY = new IntegerProperty(PREFERENCE_PREFIX + ".max_objects_in_memory", 1000);
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56 |
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57 | private JCSCacheManager() {
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58 | // Hide implicit public constructor for utility classes
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59 | }
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60 |
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61 | @SuppressWarnings("resource")
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62 | private static void initialize() throws IOException {
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63 | File cacheDir = new File(Main.pref.getCacheDirectory(), "jcs");
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64 |
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65 | if (!cacheDir.exists() && !cacheDir.mkdirs())
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66 | throw new IOException("Cannot access cache directory");
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67 |
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68 | File cacheDirLockPath = new File(cacheDir, ".lock");
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69 | if (!cacheDirLockPath.exists() && !cacheDirLockPath.createNewFile()) {
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70 | LOG.log(Level.WARNING, "Cannot create cache dir lock file");
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71 | }
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72 | cacheDirLock = new FileOutputStream(cacheDirLockPath).getChannel().tryLock();
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73 |
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74 | if (cacheDirLock == null)
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75 | LOG.log(Level.WARNING, "Cannot lock cache directory. Will not use disk cache");
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76 |
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77 | // raising logging level gives ~500x performance gain
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78 | // http://westsworld.dk/blog/2008/01/jcs-and-performance/
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79 | final Logger jcsLog = Logger.getLogger("org.apache.commons.jcs");
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80 | jcsLog.setLevel(Level.INFO);
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81 | jcsLog.setUseParentHandlers(false);
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82 | // we need a separate handler from Main's, as we downgrade LEVEL.INFO to DEBUG level
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83 | jcsLog.addHandler(new Handler() {
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84 | final SimpleFormatter formatter = new SimpleFormatter();
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85 |
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86 | @Override
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87 | public void publish(LogRecord record) {
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88 | String msg = formatter.formatMessage(record);
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89 | if (record.getLevel().intValue() >= Level.SEVERE.intValue()) {
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90 | Main.error(msg);
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91 | } else if (record.getLevel().intValue() >= Level.WARNING.intValue()) {
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92 | Main.warn(msg);
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93 | // downgrade INFO level to debug, as JCS is too verbose at INFO level
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94 | } else if (record.getLevel().intValue() >= Level.INFO.intValue()) {
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95 | Main.debug(msg);
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96 | } else {
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97 | Main.trace(msg);
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98 | }
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99 | }
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100 |
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101 | @Override
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102 | public void flush() {
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103 | // nothing to be done on flush
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104 | }
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105 |
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106 | @Override
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107 | public void close() {
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108 | // nothing to be done on close
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109 | }
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110 | });
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111 |
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112 | // this could be moved to external file
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113 | Properties props = new Properties();
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114 | // these are default common to all cache regions
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115 | // use of auxiliary cache and sizing of the caches is done with giving proper geCache(...) params
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116 | props.setProperty("jcs.default.cacheattributes", CompositeCacheAttributes.class.getCanonicalName());
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117 | props.setProperty("jcs.default.cacheattributes.MaxObjects", DEFAULT_MAX_OBJECTS_IN_MEMORY.get().toString());
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118 | props.setProperty("jcs.default.cacheattributes.UseMemoryShrinker", "true");
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119 | props.setProperty("jcs.default.cacheattributes.DiskUsagePatternName", "UPDATE"); // store elements on disk on put
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120 | props.setProperty("jcs.default.elementattributes", CacheEntryAttributes.class.getCanonicalName());
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121 | props.setProperty("jcs.default.elementattributes.IsEternal", "false");
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122 | props.setProperty("jcs.default.elementattributes.MaxLife", Long.toString(maxObjectTTL));
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123 | props.setProperty("jcs.default.elementattributes.IdleTime", Long.toString(maxObjectTTL));
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124 | props.setProperty("jcs.default.elementattributes.IsSpool", "true");
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125 | CompositeCacheManager cm = CompositeCacheManager.getUnconfiguredInstance();
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126 | cm.configure(props);
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127 | cacheManager = cm;
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128 | }
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129 |
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130 | /**
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131 | * Returns configured cache object for named cache region
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132 | * @param <K> key type
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133 | * @param <V> value type
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134 | * @param cacheName region name
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135 | * @return cache access object
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136 | * @throws IOException if directory is not found
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137 | */
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138 | public static <K, V> CacheAccess<K, V> getCache(String cacheName) throws IOException {
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139 | return getCache(cacheName, DEFAULT_MAX_OBJECTS_IN_MEMORY.get().intValue(), 0, null);
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140 | }
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141 |
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142 | /**
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143 | * Returns configured cache object with defined limits of memory cache and disk cache
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144 | * @param <K> key type
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145 | * @param <V> value type
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146 | * @param cacheName region name
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147 | * @param maxMemoryObjects number of objects to keep in memory
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148 | * @param maxDiskObjects maximum size of the objects stored on disk in kB
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149 | * @param cachePath path to disk cache. if null, no disk cache will be created
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150 | * @return cache access object
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151 | * @throws IOException if directory is not found
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152 | */
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153 | public static <K, V> CacheAccess<K, V> getCache(String cacheName, int maxMemoryObjects, int maxDiskObjects, String cachePath)
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154 | throws IOException {
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155 | if (cacheManager != null)
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156 | return getCacheInner(cacheName, maxMemoryObjects, maxDiskObjects, cachePath);
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157 |
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158 | synchronized (JCSCacheManager.class) {
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159 | if (cacheManager == null)
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160 | initialize();
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161 | return getCacheInner(cacheName, maxMemoryObjects, maxDiskObjects, cachePath);
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162 | }
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163 | }
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164 |
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165 | @SuppressWarnings("unchecked")
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166 | private static <K, V> CacheAccess<K, V> getCacheInner(String cacheName, int maxMemoryObjects, int maxDiskObjects, String cachePath)
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167 | throws IOException {
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168 | CompositeCache<K, V> cc = cacheManager.getCache(cacheName, getCacheAttributes(maxMemoryObjects));
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169 |
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170 | if (cachePath != null && cacheDirLock != null) {
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171 | IDiskCacheAttributes diskAttributes = getDiskCacheAttributes(maxDiskObjects, cachePath, cacheName);
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172 | try {
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173 | if (cc.getAuxCaches().length == 0) {
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174 | AuxiliaryCache<K, V> diskCache = diskCacheFactory.createCache(diskAttributes, cacheManager, null, new StandardSerializer());
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175 | cc.setAuxCaches(new AuxiliaryCache[]{diskCache});
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176 | }
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177 | } catch (IOException e) {
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178 | throw e;
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179 | } catch (Exception e) {
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180 | throw new IOException(e);
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181 | }
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182 | }
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183 | return new CacheAccess<>(cc);
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184 | }
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185 |
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186 | /**
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187 | * Close all files to ensure, that all indexes and data are properly written
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188 | */
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189 | public static void shutdown() {
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190 | // use volatile semantics to get consistent object
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191 | CompositeCacheManager localCacheManager = cacheManager;
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192 | if (localCacheManager != null) {
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193 | localCacheManager.shutDown();
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194 | }
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195 | }
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196 |
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197 | private static IDiskCacheAttributes getDiskCacheAttributes(int maxDiskObjects, String cachePath, String cacheName) {
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198 | IDiskCacheAttributes ret;
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199 | if (USE_BLOCK_CACHE.get()) {
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200 | BlockDiskCacheAttributes blockAttr = new BlockDiskCacheAttributes();
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201 | blockAttr.setMaxKeySize(maxDiskObjects);
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202 | ret = blockAttr;
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203 | } else {
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204 | IndexedDiskCacheAttributes indexAttr = new IndexedDiskCacheAttributes();
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205 | indexAttr.setMaxKeySize(maxDiskObjects);
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206 | ret = indexAttr;
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207 | }
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208 | ret.setDiskLimitType(IDiskCacheAttributes.DiskLimitType.SIZE);
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209 | File path = new File(cachePath);
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210 | if (!path.exists() && !path.mkdirs()) {
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211 | LOG.log(Level.WARNING, "Failed to create cache path: {0}", cachePath);
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212 | } else {
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213 | ret.setDiskPath(cachePath);
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214 | }
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215 | ret.setCacheName(cacheName + (USE_BLOCK_CACHE.get() ? "_BLOCK" : "_INDEX"));
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216 |
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217 | removeStaleFiles(cachePath + File.separator + cacheName, (USE_BLOCK_CACHE.get() ? "_INDEX" : "_BLOCK"));
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218 | return ret;
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219 | }
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220 |
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221 | private static void removeStaleFiles(String basePathPart, String suffix) {
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222 | deleteCacheFiles(basePathPart); // TODO: this can be removed around 2016.09
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223 | deleteCacheFiles(basePathPart + suffix);
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224 | }
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225 |
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226 | private static void deleteCacheFiles(String basePathPart) {
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227 | new File(basePathPart + ".key").delete();
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228 | new File(basePathPart + ".data").delete();
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229 | }
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230 |
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231 | private static CompositeCacheAttributes getCacheAttributes(int maxMemoryElements) {
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232 | CompositeCacheAttributes ret = new CompositeCacheAttributes();
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233 | ret.setMaxObjects(maxMemoryElements);
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234 | ret.setDiskUsagePattern(DiskUsagePattern.UPDATE);
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235 | return ret;
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236 | }
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237 | }
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