/*
 * 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.
 */

package org.apache.ignite.cache.spring;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Lock;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;

/**
 * Represents abstract {@link CacheManager} implementation that hand over responsibility to create new cache instances
 * and synchronization objects for cache value computations to its inheritors.
 */
public abstract class AbstractCacheManager implements CacheManager {
    /** Caches mapped to their names. */
    private final Map<String, SpringCache> caches = new ConcurrentHashMap<>();

    /** {@inheritDoc} */
    @Override public Cache getCache(String name) {
        return caches.computeIfAbsent(name, k -> createCache(name));
    }

    /** {@inheritDoc} */
    @Override public Collection<String> getCacheNames() {
        return Collections.unmodifiableSet(caches.keySet());
    }

    /** Creates {@link SpringCache} instance with specified name. */
    protected abstract SpringCache createCache(String name);

    /** Gets {@link Lock} to synchronize value calculation for specified cache and key. */
    protected abstract Lock getSyncLock(String cache, Object key);
}