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

import org.jboss.weld.annotated.enhanced.TypeClosureLazyValueHolder;
import org.jboss.weld.bootstrap.api.BootstrapService;
import org.jboss.weld.manager.BeanManagerImpl;
import org.jboss.weld.util.Function;
import org.jboss.weld.util.LazyValueHolder;
import org.jboss.weld.util.cache.ComputingCache;
import org.jboss.weld.util.cache.ComputingCacheBuilder;
import org.jboss.weld.util.collections.WeldCollections;

/**
 * Allows classes to share Maps/Sets to conserve memory.
 *
 * @author Stuart Douglas 
 * @author Jozef Hartinger
 */
public class SharedObjectCache implements BootstrapService {

    public static SharedObjectCache instance(BeanManagerImpl manager) {
        return manager.getServices().get(SharedObjectCache.class);
    }

    private final ComputingCache, Set> sharedSets = ComputingCacheBuilder.newBuilder().build(new Function, Set>() {
        @Override
        public Set apply(Set from) {
            return WeldCollections.immutableSetView(from);
        }
    });

    private final ComputingCache, Map> sharedMaps = ComputingCacheBuilder.newBuilder().build(
            new Function, Map>() {
                @Override
                public Map apply(Map from) {
            return WeldCollections.immutableMapView(from);
        }
    });

    private final ComputingCache>> typeClosureHolders = ComputingCacheBuilder.newBuilder().build(
            new Function>>() {
        @Override
                public LazyValueHolder> apply(Type input) {
            return new TypeClosureLazyValueHolder(input);
        }
    });

    public  Set getSharedSet(Set set) {
        return sharedSets.getCastValue(set);
    }

    public  Map getSharedMap(Map map) {
        return sharedMaps.getCastValue(map);
    }

    public LazyValueHolder> getTypeClosureHolder(Type type) {
        return typeClosureHolders.getValue(type);
    }

    @Override
    public void cleanupAfterBoot() {
        sharedSets.clear();
        sharedMaps.clear();
        typeClosureHolders.clear();
    }

    @Override
    public void cleanup() {
        cleanupAfterBoot();
    }
}