--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/cache/CacheFactory.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,79 @@
+package org.dive4elements.river.artifacts.cache;
+
+import org.dive4elements.artifacts.common.utils.Config;
+
+import net.sf.ehcache.Cache;
+import net.sf.ehcache.CacheException;
+import net.sf.ehcache.CacheManager;
+
+import org.apache.log4j.Logger;
+
+public final class CacheFactory
+{
+    private static Logger log = Logger.getLogger(CacheFactory.class);
+
+    public static final String CACHE_CONFIG_FILE_PROPERTY =
+        "flys.artifacts.cache.config.file";
+
+    public static final String XPATH_CACHE_CONFIG_FILE =
+        "/artifact-database/cache/config-file/text()";
+
+    private CacheFactory() {
+    }
+
+    private static boolean      initialized;
+
+    private static CacheManager cacheManager;
+
+    public static final Cache getCache() {
+        return getCache(Cache.DEFAULT_CACHE_NAME);
+    }
+
+    public static final String getConfigFile() {
+        String configFile = System.getProperty(CACHE_CONFIG_FILE_PROPERTY);
+
+        if (configFile != null) {
+            return configFile;
+        }
+
+        configFile = Config.getStringXPath(XPATH_CACHE_CONFIG_FILE);
+
+        if (configFile != null) {
+            configFile = Config.replaceConfigDir(configFile);
+        }
+
+        return configFile;
+    }
+
+    public static final synchronized Cache getCache(String cacheName) {
+        if (!initialized) {
+            initialized = true; // try only once
+            String configFile = getConfigFile();
+            if (configFile != null) {
+                try {
+                    cacheManager = CacheManager.create(configFile);
+                    //System.setProperty(
+                    //  "net.sf.ehcache.enableShutdownHook", "true");
+                    Runtime.getRuntime().addShutdownHook(new Thread() {
+                        public void run() {
+                            log.info("shutting down caches");
+                            for (String name: cacheManager.getCacheNames()) {
+                                log.info("\tflushing '" + name + "'");
+                                cacheManager.getCache(name).flush();
+                            }
+                            cacheManager.shutdown();
+                        }
+                    });
+                }
+                catch (CacheException ce) {
+                    log.error("cannot configure cache", ce);
+                }
+            }
+        }
+
+        return cacheManager != null
+            ? cacheManager.getCache(cacheName)
+            : null;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :