/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.concurrency.caching;

import java.io.Serializable;
import java.util.Map;
import org.apache.commons.collections.map.ReferenceMap;
import org.apereo.portal.IBasicEntity;
import org.apereo.portal.concurrency.CachingException;
import org.apereo.portal.concurrency.IEntityCache;
import org.apereo.portal.utils.cache.CacheFactory;
import org.apereo.portal.utils.threading.MapCachingDoubleCheckedCreator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * Creates {@link MapBackedEntityCache} instances that wrap {@link Map} caches retrieved from the
 * {@link CacheFactory} service.
 *
 */
@Service("entityCachingService")
public class CacheFactoryEntityCachingService extends AbstractEntityCachingService {
    private final EntityCacheCreator entityCacheCreator = new EntityCacheCreator();
    private CacheFactory cacheFactory;

    /** @return the cacheFactory */
    public CacheFactory getCacheFactory() {
        return cacheFactory;
    }
    /** @param cacheFactory the cacheFactory to set */
    @Autowired
    public void setCacheFactory(CacheFactory cacheFactory) {
        this.cacheFactory = cacheFactory;
    }

    /* (non-Javadoc)
     * @see org.apereo.portal.concurrency.caching.AbstractEntityCachingService#getCache(java.lang.Class)
     */
    @Override
    protected IEntityCache getCache(Class<? extends IBasicEntity> entityType)
            throws CachingException {
        return this.entityCacheCreator.get(entityType);
    }

    private class EntityCacheCreator extends MapCachingDoubleCheckedCreator<String, IEntityCache> {
        public EntityCacheCreator() {
            super(new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT));
        }

        /* (non-Javadoc)
         * @see org.apereo.portal.utils.threading.MapCachingDoubleCheckedCreator#getKey(java.lang.Object[])
         */
        @SuppressWarnings("unchecked")
        @Override
        protected String getKey(Object... args) {
            final Class<? extends IBasicEntity> entityType =
                    (Class<? extends IBasicEntity>) args[0];
            return entityType.getName();
        }

        /* (non-Javadoc)
         * @see org.apereo.portal.utils.threading.MapCachingDoubleCheckedCreator#createInternal(java.lang.Object, java.lang.Object[])
         */
        @SuppressWarnings("unchecked")
        @Override
        protected IEntityCache createInternal(String typeName, Object... args) {
            final Map<Serializable, IBasicEntity> cacheMap =
                    CacheFactoryEntityCachingService.this.cacheFactory.getCache(typeName);
            final Class<? extends IBasicEntity> entityType =
                    (Class<? extends IBasicEntity>) args[0];
            return new MapBackedEntityCache(cacheMap, entityType);
        }
    }
}