/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.spring.cache;

import com.hazelcast.core.DistributedObject;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * @author mdogan 4/3/12
 */
public class HazelcastCacheManager implements CacheManager {

    private final ConcurrentMap<String, Cache> caches = new ConcurrentHashMap<String, Cache>();
    private HazelcastInstance hazelcastInstance;

    public HazelcastCacheManager() {
    }

    public HazelcastCacheManager(HazelcastInstance hazelcastInstance) {
        this.hazelcastInstance = hazelcastInstance;
    }

    @Override
    public Cache getCache(String name) {
        Cache cache = caches.get(name);
        if (cache == null) {
            final IMap<Object, Object> map = hazelcastInstance.getMap(name);
            cache = new HazelcastCache(map);
            final Cache currentCache = caches.putIfAbsent(name, cache);
            if (currentCache != null) {
                cache = currentCache;
            }
        }
        return cache;
    }

    @Override
    public Collection<String> getCacheNames() {
        Set<String> cacheNames = new HashSet<String>();
        final Collection<DistributedObject> distributedObjects = hazelcastInstance.getDistributedObjects();
        for (DistributedObject distributedObject : distributedObjects) {
            if (distributedObject instanceof IMap) {
                final IMap<?, ?> map = (IMap) distributedObject;
                cacheNames.add(map.getName());
            }
        }
        return cacheNames;
    }

    public void setHazelcastInstance(final HazelcastInstance hazelcastInstance) {
        this.hazelcastInstance = hazelcastInstance;
    }

    public HazelcastInstance getHazelcastInstance() {
        return hazelcastInstance;
    }
}