--- /dev/null
+/*
+ * Copyright 2005 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.wamblee.cache;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Serializable;
+
+import net.sf.ehcache.Cache;
+import net.sf.ehcache.CacheException;
+import net.sf.ehcache.CacheManager;
+import net.sf.ehcache.Element;
+import net.sf.ehcache.config.Configuration;
+import net.sf.ehcache.config.ConfigurationFactory;
+
+import org.apache.log4j.Logger;
+import org.wamblee.io.InputResource;
+
+/**
+ * Cache implemented on top of EhCache.
+ *
+ * @author Erik Brakkee
+ */
+public class EhCache<KeyType extends Serializable, ValueType extends Serializable>
+ implements org.wamblee.cache.Cache<KeyType, ValueType> {
+
+ private static final Logger LOGGER = Logger.getLogger(EhCache.class);
+
+ /**
+ * EH Cache manager.
+ */
+ private CacheManager _manager;
+
+ /**
+ * EH cache.
+ */
+ private Cache _cache;
+
+ /**
+ * Constructs a cache based on EHCache.
+ *
+ * @param aResource
+ * Resource containing the configuration file for EHCache.
+ * @param aCacheName
+ * Name of the cache to use. If a cache with this name does not
+ * exist, one is created based on default settings.
+ * @throws IOException
+ * @throws CacheException
+ */
+ public EhCache(InputResource aResource, String aCacheName)
+ throws IOException, CacheException {
+ InputStream is = aResource.getInputStream();
+ try {
+ _manager = new CacheManager(is);
+ _cache = _manager.getCache(aCacheName);
+ if (_cache == null) {
+ LOGGER.warn("Creating cache '" + aCacheName
+ + "' because it is not configured");
+ _manager.addCache(aCacheName);
+ _cache = _manager.getCache(aCacheName);
+ }
+ assert _cache != null;
+ } finally {
+ is.close();
+ }
+
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.wamblee.cache.Cache#put(KeyType, ValueType)
+ */
+ public void put(KeyType aKey, ValueType aValue) {
+ _cache.put(new Element(aKey, aValue));
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.wamblee.cache.Cache#get(KeyType)
+ */
+ public ValueType get(KeyType aKey) {
+ try {
+ Element element = _cache.get(aKey);
+ if (element == null) {
+ return null;
+ }
+ return (ValueType) element.getValue();
+ } catch (CacheException e) {
+ throw new RuntimeException("Cache problem key = '" + aKey + "'", e);
+ }
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.wamblee.cache.Cache#remove(KeyType)
+ */
+ public void remove(KeyType aKey) {
+ _cache.remove(aKey);
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.wamblee.cache.Cache#clear()
+ */
+ public void clear() {
+ _cache.removeAll();
+ }
+}