| package org.apache.commons.jcs; |
| |
| import java.util.Properties; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| import org.apache.commons.jcs.access.CacheAccess; |
| import org.apache.commons.jcs.access.GroupCacheAccess; |
| import org.apache.commons.jcs.access.exception.CacheException; |
| import org.apache.commons.jcs.engine.behavior.ICompositeCacheAttributes; |
| import org.apache.commons.jcs.engine.behavior.IElementAttributes; |
| import org.apache.commons.jcs.engine.control.CompositeCache; |
| import org.apache.commons.jcs.engine.control.CompositeCacheManager; |
| import org.apache.commons.jcs.engine.control.group.GroupAttrName; |
| |
| /** |
| * Simple class for using JCS. To use JCS in your application, you can use the static methods of |
| * this class to get access objects (instances of this class) for your cache regions. One CacheAccess |
| * object should be created for each region you want to access. If you have several regions, then |
| * get instances for each. For best performance the getInstance call should be made in an |
| * initialization method. |
| */ |
| public abstract class JCS |
| { |
| /** cache.ccf alternative. */ |
| private static String configFilename = null; |
| |
| /** alternative configuration properties */ |
| private static Properties configProps = null; |
| |
| /** Cache manager use by the various forms of defineRegion and getAccess */ |
| private static CompositeCacheManager cacheMgr; |
| |
| /** |
| * Define a new cache region with the given name. In the oracle specification, these attributes |
| * are global and not region specific, regional overrides is a value add each region should be |
| * able to house both cache and element attribute sets. It is more efficient to define a cache |
| * in the props file and then strictly use the get access method. Use of the define region |
| * outside of an initialization block should be avoided. |
| * <p> |
| * @param name Name that will identify the region |
| * @return CacheAccess instance for the new region |
| * @throws CacheException |
| * |
| * @deprecated Duplicate of getInstance(String) |
| */ |
| @Deprecated |
| public static <K, V> CacheAccess<K, V> defineRegion( String name ) |
| throws CacheException |
| { |
| CompositeCache<K, V> cache = getCacheManager().getCache( name ); |
| return new CacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Define a new cache region with the specified name and attributes. |
| * <p> |
| * @param name Name that will identify the region |
| * @param cattr CompositeCacheAttributes for the region |
| * @return CacheAccess instance for the new region |
| * @throws CacheException |
| * |
| * @deprecated Duplicate of getInstance(String, ICompositeCacheAttributes) |
| */ |
| @Deprecated |
| public static <K, V> CacheAccess<K, V> defineRegion( String name, ICompositeCacheAttributes cattr ) |
| throws CacheException |
| { |
| CompositeCache<K, V> cache = getCacheManager().getCache( name, cattr ); |
| return new CacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Define a new cache region with the specified name and attributes and return a CacheAccess to |
| * it. |
| * <p> |
| * @param name Name that will identify the region |
| * @param cattr CompositeCacheAttributes for the region |
| * @param attr Attributes for the region |
| * @return CacheAccess instance for the new region |
| * @throws CacheException |
| * |
| * @deprecated Duplicate of getInstance(String, ICompositeCacheAttributes, IElementAttributes) |
| */ |
| @Deprecated |
| public static <K, V> CacheAccess<K, V> defineRegion( String name, ICompositeCacheAttributes cattr, IElementAttributes attr ) |
| throws CacheException |
| { |
| CompositeCache<K, V> cache = getCacheManager().getCache( name, cattr, attr ); |
| return new CacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Set the filename that the cache manager will be initialized with. Only matters before the |
| * instance is initialized. |
| * <p> |
| * @param configFilename |
| */ |
| public static void setConfigFilename( String configFilename ) |
| { |
| JCS.configFilename = configFilename; |
| } |
| |
| /** |
| * Set the properties that the cache manager will be initialized with. Only |
| * matters before the instance is initialized. |
| * |
| * @param configProps |
| */ |
| public static void setConfigProperties( Properties configProps ) |
| { |
| JCS.configProps = configProps; |
| } |
| |
| /** |
| * Helper method which checks to make sure the cacheMgr class field is set, and if not requests |
| * an instance from CacheManagerFactory. |
| * |
| * @throws CacheException if the configuration cannot be loaded |
| */ |
| private static CompositeCacheManager getCacheManager() throws CacheException |
| { |
| synchronized ( JCS.class ) |
| { |
| if ( cacheMgr == null || !cacheMgr.isInitialized()) |
| { |
| if ( configProps != null ) |
| { |
| cacheMgr = CompositeCacheManager.getUnconfiguredInstance(); |
| cacheMgr.configure( configProps ); |
| } |
| else if ( configFilename != null ) |
| { |
| cacheMgr = CompositeCacheManager.getUnconfiguredInstance(); |
| cacheMgr.configure( configFilename ); |
| } |
| else |
| { |
| cacheMgr = CompositeCacheManager.getInstance(); |
| } |
| } |
| |
| return cacheMgr; |
| } |
| } |
| |
| /** |
| * Get a CacheAccess which accesses the provided region. |
| * <p> |
| * @param region Region that return CacheAccess will provide access to |
| * @return A CacheAccess which provides access to a given region. |
| * @throws CacheException |
| */ |
| public static <K, V> CacheAccess<K, V> getInstance( String region ) |
| throws CacheException |
| { |
| CompositeCache<K, V> cache = getCacheManager().getCache( region ); |
| return new CacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Get a CacheAccess which accesses the provided region. |
| * <p> |
| * @param region Region that return CacheAccess will provide access to |
| * @param icca CacheAttributes for region |
| * @return A CacheAccess which provides access to a given region. |
| * @throws CacheException |
| */ |
| public static <K, V> CacheAccess<K, V> getInstance( String region, ICompositeCacheAttributes icca ) |
| throws CacheException |
| { |
| CompositeCache<K, V> cache = getCacheManager().getCache( region, icca ); |
| return new CacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Get a CacheAccess which accesses the provided region. |
| * <p> |
| * @param region Region that return CacheAccess will provide access to |
| * @param icca CacheAttributes for region |
| * @param eattr ElementAttributes for the region |
| * @return A CacheAccess which provides access to a given region. |
| * @throws CacheException |
| */ |
| public static <K, V> CacheAccess<K, V> getInstance( String region, ICompositeCacheAttributes icca, IElementAttributes eattr ) |
| throws CacheException |
| { |
| CompositeCache<K, V> cache = getCacheManager().getCache( region, icca, eattr ); |
| return new CacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Get a GroupCacheAccess which accesses the provided region. |
| * <p> |
| * @param region Region that return GroupCacheAccess will provide access to |
| * @return A GroupCacheAccess which provides access to a given region. |
| * @throws CacheException |
| */ |
| public static <K, V> GroupCacheAccess<K, V> getGroupCacheInstance( String region ) |
| throws CacheException |
| { |
| CompositeCache<GroupAttrName<K>, V> cache = getCacheManager().getCache( region ); |
| return new GroupCacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Get a GroupCacheAccess which accesses the provided region. |
| * <p> |
| * @param region Region that return GroupCacheAccess will provide access to |
| * @param icca CacheAttributes for region |
| * @return A GroupCacheAccess which provides access to a given region. |
| * @throws CacheException |
| */ |
| public static <K, V> GroupCacheAccess<K, V> getGroupCacheInstance( String region, ICompositeCacheAttributes icca ) |
| throws CacheException |
| { |
| CompositeCache<GroupAttrName<K>, V> cache = getCacheManager().getCache( region, icca ); |
| return new GroupCacheAccess<K, V>( cache ); |
| } |
| |
| /** |
| * Get a GroupCacheAccess which accesses the provided region. |
| * <p> |
| * @param region Region that return CacheAccess will provide access to |
| * @param icca CacheAttributes for region |
| * @param eattr ElementAttributes for the region |
| * @return A GroupCacheAccess which provides access to a given region. |
| * @throws CacheException |
| */ |
| public static <K, V> GroupCacheAccess<K, V> getGroupCacheInstance( String region, ICompositeCacheAttributes icca, IElementAttributes eattr ) |
| throws CacheException |
| { |
| CompositeCache<GroupAttrName<K>, V> cache = getCacheManager().getCache( region, icca, eattr ); |
| return new GroupCacheAccess<K, V>( cache ); |
| } |
| } |