--- a/flys-artifacts/ChangeLog	Fri Apr 29 15:10:44 2011 +0000
+++ b/flys-artifacts/ChangeLog	Fri Apr 29 16:56:37 2011 +0000
@@ -1,3 +1,14 @@
+2011-04-29	Sascha L. Teichmann	<sascha.teichmann@intevation.de>
+
+	* pom.xml: Added dependency to Ehcache. Apache 2.0 license.
+
+	* doc/conf/conf.xml: Added configuration of ehcache.
+
+	* doc/conf/cache.xml: New. Cache configurations.
+
+	* src/main/java/de/intevation/flys/artifacts/cache/CacheFactory.java:
+	  New. Factory to access caches.
+
 2011-04-29	Sascha L. Teichmann	<sascha.teichmann@intevation.de>
 
 	* src/main/java/de/intevation/flys/artifacts/services/MetaDataService.java:

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/doc/conf/cache.xml	Fri Apr 29 16:56:37 2011 +0000
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ehcache>
+
+    <diskStore path="java.io.tmpdir"/>
+
+    <defaultCache
+            maxElementsInMemory="1000"
+            eternal="false"
+            timeToIdleSeconds="120"
+            timeToLiveSeconds="3600"
+            overflowToDisk="true"
+            maxElementsOnDisk="100000"
+            diskPersistent="false"
+            diskExpiryThreadIntervalSeconds="120"
+            memoryStoreEvictionPolicy="LRU"
+            />
+
+    <!-- This one is used for the WST value tables -->
+
+    <cache name="wst-cache"
+           maxElementsInMemory="20"
+           maxElementsOnDisk="100"
+           eternal="false"
+           timeToIdleSeconds="360"
+           overflowToDisk="true"
+           timeToLiveSeconds="14400"
+           diskPersistent="true"
+           memoryStoreEvictionPolicy="LRU"
+           />
+</ehcache>

--- a/flys-artifacts/doc/conf/conf.xml	Fri Apr 29 15:10:44 2011 +0000
+++ b/flys-artifacts/doc/conf/conf.xml	Fri Apr 29 16:56:37 2011 +0000
@@ -62,6 +62,11 @@
     <cleaner>
         <sleep-time>60000</sleep-time>
     </cleaner>
+
+    <cache>
+        <config-file>${artifacts.config.dir}/cache.xml</config-file>
+    </cache>
+
     <database>
         <!-- This Section configures the Settings for connecting to the 
              Artifact-Database instance. e.g. SQLite -->

--- a/flys-artifacts/pom.xml	Fri Apr 29 15:10:44 2011 +0000
+++ b/flys-artifacts/pom.xml	Fri Apr 29 16:56:37 2011 +0000
@@ -30,6 +30,11 @@
 
   <dependencies>
     <dependency>
+      <groupId>net.sf.ehcache</groupId>
+      <artifactId>ehcache-core</artifactId>
+      <version>2.4.2</version>
+    </dependency>
+    <dependency>
       <groupId>jfree</groupId>
       <artifactId>jfreechart</artifactId>
       <version>1.0.13</version>

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/cache/CacheFactory.java	Fri Apr 29 16:56:37 2011 +0000
@@ -0,0 +1,56 @@
+package de.intevation.flys.artifacts.cache;
+
+import de.intevation.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 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 synchronized Cache getCache(String cacheName) {
+        if (!initialized) {
+            initialized = true; // try only once
+            String configFile = Config.getStringXPath(XPATH_CACHE_CONFIG_FILE);
+            if (configFile != null) {
+                configFile = Config.replaceConfigDir(configFile);
+                try {
+                    cacheManager = CacheManager.create(configFile);
+                    //System.setProperty(
+                    //  "net.sf.ehcache.enableShutdownHook", "true");
+                    Runtime.getRuntime().addShutdownHook(new Thread() {
+                        public void run() {
+                            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 :