spring-cache-api/src/main/java/org/apache/archiva/redback/components/cache/builder/DefaultCacheBuilder.java

package org.apache.archiva.redback.components.cache.builder;

/*
 * 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.archiva.redback.components.cache.Cache;
import org.apache.archiva.redback.components.cache.impl.NoCacheCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;

/**
 * Ability to obtain cache
 *
 * @author Olivier Lamy
 *
 */
@Service
public class DefaultCacheBuilder<V,T>
    implements CacheBuilder<V,T>
{

    private Logger log = LoggerFactory.getLogger( getClass() );

    private Cache<V,T> defaultCache;

    private Cache<V,T> noCache = new NoCacheCache<V,T>();

    @Inject
    private ApplicationContext applicationContext;

    @PostConstruct
    public void initialize()
    {
        if ( this.applicationContext.containsBean( "cache#default" ) )
        {
            this.defaultCache = this.applicationContext.getBean( "cache#default", Cache.class );

        }
        else
        {
            log.info( "Cache with role-hint default doesn't exists, default will be no cache" );
            this.defaultCache = new NoCacheCache();
        }
    }

    public Cache<V,T> getCache( String roleHint )
    {
        if ( this.applicationContext.containsBean( "cache#" + roleHint ) )
        {
            return this.applicationContext.getBean( "cache#" + roleHint, Cache.class );
        }

        return this.getDefaultCache();
    }

    public Cache<V,T> getCache( Class clazz )
    {
        return this.getCache( clazz.getName() );
    }

    @PreDestroy
    public void dispose()
    {
        // TODO dispose default ?
    }

    public Cache<V,T> getDefaultCache()
    {
        return defaultCache == null ? this.noCache : this.defaultCache;
    }
}