revised cache abstraction

- removed AbstractDelegatingCache (a cache is not a map, no need to offer a template)
+ renamed ConcurrentCache to ConcurrentCacheMap

org.springframework.context/.project

-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>org.springframework.context</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.springframework.ide.eclipse.core.springbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.springframework.ide.eclipse.core.springnature</nature>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-	</natures>
-</projectDescription>
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.springframework.context</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.wst.common.project.facet.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.springframework.ide.eclipse.core.springbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.springframework.ide.eclipse.core.springnature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
+	</natures>
+</projectDescription>

org.springframework.context/src/main/java/org/springframework/cache/concurrent/ConcurrentCache.java

-/*
- * Copyright 2010-2011 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.springframework.cache.concurrent;
-
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
-
-import org.springframework.cache.Cache;
-import org.springframework.cache.support.AbstractDelegatingCache;
-
-/**
- * Simple {@link Cache} implementation based on the JDK 1.5+
- * java.util.concurrent package. Useful for testing or simple caching scenarios.
- * 
- * @author Costin Leau
- */
-public class ConcurrentCache<K, V> extends AbstractDelegatingCache<K, V> {
-
-	private final ConcurrentMap<K, V> store;
-	private final String name;
-
-	public ConcurrentCache() {
-		this("");
-	}
-
-	public ConcurrentCache(String name) {
-		this(new ConcurrentHashMap<K, V>(), name);
-	}
-
-	public ConcurrentCache(ConcurrentMap<K, V> delegate, String name) {
-		super(delegate, true);
-		this.store = delegate;
-		this.name = name;
-	}
-
-	public String getName() {
-		return name;
-	}
-
-	public ConcurrentMap<K, V> getNativeCache() {
-		return store;
-	}
-}
\ No newline at end of file

org.springframework.context/src/main/java/org/springframework/cache/concurrent/ConcurrentCacheFactoryBean.java

@@ -24,28 +24,28 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.util.StringUtils;
 
 /**
- * Factory bean for easy configuration of {@link ConcurrentCache} through Spring.
+ * Factory bean for easy configuration of {@link ConcurrentMapCache} through Spring.
  * 
  * @author Costin Leau
  */
-public class ConcurrentCacheFactoryBean<K, V> implements FactoryBean<ConcurrentCache<K, V>>, BeanNameAware,
+public class ConcurrentCacheFactoryBean<K, V> implements FactoryBean<ConcurrentMapCache<K, V>>, BeanNameAware,
 		InitializingBean {
 
 	private String name = "";
-	private ConcurrentCache<K, V> cache;
+	private ConcurrentMapCache<K, V> cache;
 
 	private ConcurrentMap<K, V> store;
 
 	public void afterPropertiesSet() {
-		cache = (store == null ? new ConcurrentCache<K, V>(name) : new ConcurrentCache<K, V>(store, name));
+		cache = (store == null ? new ConcurrentMapCache<K, V>(name) : new ConcurrentMapCache<K, V>(store, name, true));
 	}
 
-	public ConcurrentCache<K, V> getObject() throws Exception {
+	public ConcurrentMapCache<K, V> getObject() throws Exception {
 		return cache;
 	}
 
 	public Class<?> getObjectType() {
-		return (cache != null ? cache.getClass() : ConcurrentCache.class);
+		return (cache != null ? cache.getClass() : ConcurrentMapCache.class);
 	}
 
 	public boolean isSingleton() {

org.springframework.context/src/main/java/org/springframework/cache/support/AbstractDelegatingCache.java → org.springframework.context/src/main/java/org/springframework/cache/concurrent/ConcurrentMapCache.java

@@ -14,85 +14,84 @@
  * limitations under the License.
  */
 
-package org.springframework.cache.support;
+package org.springframework.cache.concurrent;
 
 import java.io.Serializable;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
 
 import org.springframework.cache.Cache;
 import org.springframework.cache.interceptor.DefaultValueWrapper;
-import org.springframework.util.Assert;
 
 /**
- * Abstract base class delegating most of the {@link Map}-like methods
- * to the underlying cache.
- * 
- * <b>Note:</b>Allows null values to be stored even (for cases where the 
- * underlying cache does not support them) as long as arbitrary serialized
- * objects are supported.
+ * Simple {@link Cache} implementation based on the JDK 1.5+
+ * java.util.concurrent package. Useful for testing or simple caching scenarios.
+ *
+ * <b>Note:</b>As {@link ConcurrentHashMap} (the default implementation used) does not allow null values to be stored 
+ * this class will replace them with a predefined, internal object. This behaviour can be changed through the {@link #ConcurrentMapCache(ConcurrentMap, String, boolean)}
+ * constructor.
  * 
  * @author Costin Leau
  */
-public abstract class AbstractDelegatingCache<K, V> implements Cache<K, V> {
+public class ConcurrentMapCache<K, V> implements Cache<K, V> {
 
 	private static class NullHolder implements Serializable {
 		private static final long serialVersionUID = 1L;
 	}
 
-	public static final Object NULL_HOLDER = new NullHolder();
-
-	private final Map<K, V> delegate;
+	private static final Object NULL_HOLDER = new NullHolder();
+	private final ConcurrentMap<K, V> store;
+	private final String name;
 	private final boolean allowNullValues;
 
-	/**
-	 * Creates a new instance using the given delegate.
-	 * 
-	 * @param <D> map type
-	 * @param delegate map delegate
-	 */
-	public <D extends Map<K, V>> AbstractDelegatingCache(D delegate) {
-		this(delegate, false);
+	public ConcurrentMapCache() {
+		this("");
+	}
+
+	public ConcurrentMapCache(String name) {
+		this(new ConcurrentHashMap<K, V>(), name, true);
 	}
 
-	/**
-	 * Creates a new instance using the given delegate.
-	 * 
-	 * @param <D> map type
-	 * @param delegate map delegate
-	 * @param allowNullValues flag indicating whether null values should be replaced or not
-	 */
-	public <D extends Map<K, V>> AbstractDelegatingCache(D delegate, boolean allowNullValues) {
-		Assert.notNull(delegate);
-		this.delegate = delegate;
+	public ConcurrentMapCache(ConcurrentMap<K, V> delegate, String name, boolean allowNullValues) {
+		this.store = delegate;
+		this.name = name;
 		this.allowNullValues = allowNullValues;
 	}
 
+	public String getName() {
+		return name;
+	}
+
 	public boolean getAllowNullValues() {
 		return allowNullValues;
 	}
 
+	public ConcurrentMap<K, V> getNativeCache() {
+		return store;
+	}
+
 	public void clear() {
-		delegate.clear();
+		store.clear();
 	}
 
 	public ValueWrapper<V> get(Object key) {
-		V v = delegate.get(key);
+		V v = store.get(key);
 		return (v != null ? new DefaultValueWrapper<V>(filterNull(v)) : null);
 	}
 
 	@SuppressWarnings("unchecked")
 	public void put(K key, V value) {
 		if (allowNullValues && value == null) {
-			Map map = delegate;
+			Map map = store;
 			map.put(key, NULL_HOLDER);
-		}
-		else {
-			delegate.put(key, value);
+		} else {
+			store.put(key, value);
 		}
 	}
 
 	public void evict(Object key) {
-		delegate.remove(key);
+		store.remove(key);
 	}
 
 	protected V filterNull(V val) {

org.springframework.context/src/test/java/org/springframework/cache/concurrent/ConcurrentCacheTest.java

@@ -29,7 +29,7 @@ public class ConcurrentCacheTest extends AbstractNativeCacheTest<ConcurrentMap<O
 
 	@Override
 	protected Cache createCache(ConcurrentMap<Object, Object> nativeCache) {
-		return new ConcurrentCache(nativeCache, CACHE_NAME);
+		return new ConcurrentMapCache(nativeCache, CACHE_NAME, true);
 	}
 
 	@Override