/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.core.impl.cache;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.kuali.rice.core.api.cache.CacheManagerRegistry;

 import org.kuali.rice.core.api.exception.RiceIllegalArgumentException;

 import org.springframework.beans.factory.NamedBean;

 import org.springframework.cache.CacheManager;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.CopyOnWriteArrayList;

 /**

  * A simple class that holds a global registry to the cache managers.

  */

 public final class CacheManagerRegistryImpl implements CacheManagerRegistry {

     private static final String GET_NAME = "getName";

     private static final Log LOG = LogFactory.getLog(CacheManagerRegistryImpl.class);

     private static final String GET_NAME_MSG = "unable to get the getName method on the cache manager";

     private static final List<CacheManager> CACHE_MANAGERS = new CopyOnWriteArrayList<CacheManager>();

     private static final Map<String, CacheManager> CACHE_MANAGER_MAP = new ConcurrentHashMap<String, CacheManager> ();

     public void setCacheManager(CacheManager c) {

         if (c == null) {

             throw new IllegalArgumentException("c is null");

         }

         CACHE_MANAGERS.add(c);

         //keep map as well

         for (String cacheName : c.getCacheNames()) {

             CACHE_MANAGER_MAP.put(cacheName, c);

         }

     }

     @Override

     public List<CacheManager> getCacheManagers() {

         return Collections.unmodifiableList(CACHE_MANAGERS);

     }

     @Override

     public CacheManager getCacheManager(String name) {

         for (CacheManager cm : getCacheManagers()) {

             if (name.equals(getCacheManagerName(cm))) {

                 return cm;

             }

         }

         return null;

     }

     @Override

     public String getCacheManagerName(CacheManager cm) {

         if (cm instanceof NamedBean) {

             return ((NamedBean) cm).getBeanName();

         }

         String v = "Unnamed CacheManager " + cm.hashCode();

         try {

             final Method nameMethod = cm.getClass().getMethod(GET_NAME, new Class[] {});

             if (nameMethod != null && nameMethod.getReturnType() == String.class) {

                 v = (String) nameMethod.invoke(cm, new Object[] {});

             }

         } catch (NoSuchMethodException e) {

             LOG.warn(GET_NAME_MSG, e);

         } catch (InvocationTargetException e) {

             LOG.warn(GET_NAME_MSG, e);

         } catch (IllegalAccessException e) {

             LOG.warn(GET_NAME_MSG, e);

         }

         return v;

     }

     @Override

     public CacheManager getCacheManagerByCacheName(String cacheName) {

         CacheManager cm = CACHE_MANAGER_MAP.get(cacheName);

         if (cm != null) {

             return cm;

         }

         throw new RiceIllegalArgumentException("Cache not found : " + cacheName);

     }

 }