net.jawr.web.cache.CacheManagerFactory Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jawr-core Show documentation

Javascript/CSS bundling and compressing tool for java web apps. By using jawr resources are automatically bundled together and optionally minified and gzipped. Jawr provides tag libraries to reference a generated bundle either by id or by using the name of any of its members.

The newest version!

/**
 * Copyright 2011-2016 Ibrahim Chaehoi
 * 
 * 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 net.jawr.web.cache;

import net.jawr.web.config.JawrConfig;
import net.jawr.web.resource.bundle.factory.util.ClassLoaderResourceUtils;

/**
 * The cache manager factory
 * 
 * @author Ibrahim Chaehoi
 */
public class CacheManagerFactory {

	/** The cache attribute prefix */
	private static final String CACHE_ATTR_PREFIX = "JAWR.";

	/** The cache attribute suffix */
	private static final String CACHE_ATTR_SUFFIX = ".CACHE.MANAGER";

	/** The configuration property name */
	private static final String CACHE_PROPERTY_NAME = "jawr.cache.manager";

	/**
	 * Retrieves the cache manager for a resource type
	 * 
	 * @param config
	 *            the jawr config
	 * @param resourceType
	 *            the resource type
	 * @return the cache manager for a resource type
	 */
	public static JawrCacheManager getCacheManager(JawrConfig config, String resourceType) {

		String cacheMgrAttributeName = CACHE_ATTR_PREFIX + resourceType.toUpperCase() + CACHE_ATTR_SUFFIX;
		JawrCacheManager cacheManager = (JawrCacheManager) config.getContext().getAttribute(cacheMgrAttributeName);
		if (cacheManager == null) {
			String cacheManagerClass = config.getProperty(CACHE_PROPERTY_NAME, BasicCacheManager.class.getName());
			cacheManager = (JawrCacheManager) ClassLoaderResourceUtils.buildObjectInstance(cacheManagerClass,
					new Object[] { config });
			config.getContext().setAttribute(cacheMgrAttributeName, cacheManager);
		}
		return cacheManager;
	}

	/**
	 * Resets the cache manager for a resource type
	 * 
	 * @param config
	 *            the jawr config
	 * @param resourceType
	 *            the resource type
	 * @return the cache manager for a resource type
	 */
	public static synchronized JawrCacheManager resetCacheManager(JawrConfig config, String resourceType) {

		String cacheMgrAttributeName = CACHE_ATTR_PREFIX + resourceType.toUpperCase() + CACHE_ATTR_SUFFIX;
		JawrCacheManager cacheManager = (JawrCacheManager) config.getContext().getAttribute(cacheMgrAttributeName);
		if (cacheManager != null) {
			cacheManager.clear();
			config.getContext().removeAttribute(cacheMgrAttributeName);
		}

		return getCacheManager(config, resourceType);
	}

}