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/*
 * Copyright (c) 2008-2016, 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.hibernate;

import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.hibernate.instance.DefaultHazelcastInstanceFactory;
import com.hazelcast.hibernate.instance.IHazelcastInstanceFactory;
import com.hazelcast.hibernate.instance.IHazelcastInstanceLoader;
import com.hazelcast.hibernate.local.CleanupService;
import com.hazelcast.hibernate.region.HazelcastQueryResultsRegion;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import org.hibernate.boot.spi.SessionFactoryOptions;
import org.hibernate.cache.CacheException;
import org.hibernate.cache.spi.QueryResultsRegion;
import org.hibernate.cache.spi.RegionFactory;
import org.hibernate.cache.spi.access.AccessType;

import java.util.Properties;

/**
 * Abstract superclass of Hazelcast based {@link RegionFactory} implementations
 */
public abstract class AbstractHazelcastCacheRegionFactory implements RegionFactory {

    protected HazelcastInstance instance;
    protected CleanupService cleanupService;
    private final ILogger log = Logger.getLogger(getClass());

    private IHazelcastInstanceLoader instanceLoader;


    public AbstractHazelcastCacheRegionFactory() {
    }

    public AbstractHazelcastCacheRegionFactory(final Properties properties) {
        this();
    }

    public AbstractHazelcastCacheRegionFactory(final HazelcastInstance instance) {
        this.instance = instance;
    }

    @Override
    public final QueryResultsRegion buildQueryResultsRegion(final String regionName, final Properties properties)
            throws CacheException {
        HazelcastQueryResultsRegion region = new HazelcastQueryResultsRegion(instance, regionName, properties);
        cleanupService.registerCache(region.getCache());
        return region;
    }

    /**
     * @return true - for a large cluster, unnecessary puts will most likely slow things down.
     */
    @Override
    public boolean isMinimalPutsEnabledByDefault() {
        return true;
    }

    @Override
    public long nextTimestamp() {
        return HazelcastTimestamper.nextTimestamp(instance);
    }

    @Override
    public void start(final SessionFactoryOptions options, final Properties properties) throws CacheException {
        log.info("Starting up " + getClass().getSimpleName());
        if (instance == null || !instance.getLifecycleService().isRunning()) {
            String defaultFactory = DefaultHazelcastInstanceFactory.class.getName();
            String factoryName = properties.getProperty(CacheEnvironment.HAZELCAST_FACTORY, defaultFactory);
            ClassLoader cl = Thread.currentThread().getContextClassLoader();
            try {
                Class factory =
                        (Class) Class.forName(factoryName, true, cl);
                instanceLoader = factory.newInstance().createInstanceLoader(properties);
            } catch (ClassNotFoundException e) {
                throw new CacheException("Failed to set up hazelcast instance factory", e);
            } catch (InstantiationException e) {
                throw new CacheException("Failed to set up hazelcast instance factory", e);
            } catch (IllegalAccessException e) {
                throw new CacheException("Failed to set up hazelcast instance factory", e);
            }
            instance = instanceLoader.loadInstance();
        }
        cleanupService = new CleanupService(instance.getName());
    }

    @Override
    public void stop() {
        if (instanceLoader != null) {
            log.info("Shutting down " + getClass().getSimpleName());
            instanceLoader.unloadInstance();
            instance = null;
            instanceLoader = null;
        }
        cleanupService.stop();
    }

    public HazelcastInstance getHazelcastInstance() {
        return instance;
    }

    @Override
    public AccessType getDefaultAccessType() {
        return AccessType.READ_WRITE;
    }
}