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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.weld.resources;

import static org.jboss.weld.util.cache.LoadingCacheUtils.getCacheValue;
import static org.jboss.weld.util.cache.LoadingCacheUtils.getCastCacheValue;

import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;
import java.util.Set;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.jboss.weld.bootstrap.api.Service;
import org.jboss.weld.util.collections.ArraySetMultimap;
import org.jboss.weld.util.reflection.HierarchyDiscovery;

/**
 * Allows classes to share Maps/Sets to conserve memory.
 *
 * @author Stuart Douglas 
 */
public class SharedObjectCache implements Service {
    private final LoadingCache, Set> sharedSets = CacheBuilder.newBuilder().build(new CacheLoader, Set>() {
        public Set load(Set from) {
            return Collections.unmodifiableSet(from);
        }
    });

    private final LoadingCache, Map> sharedMaps = CacheBuilder.newBuilder().build(new CacheLoader, Map>() {
        public Map load(Map from) {
            return Collections.unmodifiableMap(from);
        }
    });

    private final LoadingCache, ArraySetMultimap> sharedMultiMaps = CacheBuilder.newBuilder().build(new CacheLoader, ArraySetMultimap>() {
        public ArraySetMultimap load(ArraySetMultimap from) {
            return from;
        }
    });

    private final LoadingCache> typeClosures = CacheBuilder.newBuilder().build(new CacheLoader>() {

        public Set load(Type from) {
            return Collections.unmodifiableSet(new HierarchyDiscovery(from).getTypeClosure());
        }
    });

    private final LoadingCache resolvedTypes = CacheBuilder.newBuilder().build(new CacheLoader() {

        public Type load(Type from) {
            return new HierarchyDiscovery(from).getResolvedType();
        }
    });

    public  Set getSharedSet(Set set) {
        return getCastCacheValue(sharedSets, set);
    }

    public  Map getSharedMap(Map map) {
        return getCastCacheValue(sharedMaps, map);
    }

    public  ArraySetMultimap getSharedMultimap(ArraySetMultimap map) {
        return getCastCacheValue(sharedMultiMaps, map);
    }

    public Set getTypeClosure(Type type) {
        return getCacheValue(typeClosures, type);
    }

    public Type getResolvedType(Type type) {
        return getCacheValue(resolvedTypes, type);
    }

    public void cleanup() {
        sharedSets.invalidateAll();
        sharedMaps.invalidateAll();
        sharedMultiMaps.invalidateAll();
    }
}