/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  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 io.seata.server.lock;

import io.seata.common.loader.EnhancedServiceLoader;
import io.seata.config.Configuration;
import io.seata.config.ConfigurationFactory;
import io.seata.server.store.StoreConfig;
import io.seata.server.store.StoreConfig.LockMode;

/**
 * The type Lock manager factory.
 *
 * @author sharajava
 */
public class LockerManagerFactory {

	private static final Configuration CONFIG = ConfigurationFactory.getInstance();

	/**
	 * the lock manager
	 */
	private static volatile LockManager LOCK_MANAGER;

	/**
	 * Get lock manager.
	 * @return the lock manager
	 */
	public static LockManager getLockManager() {
		if (LOCK_MANAGER == null) {
			init();
		}
		return LOCK_MANAGER;
	}

	public static void init() {
		init(null);
	}

	public static void init(LockMode lockMode) {
		if (LOCK_MANAGER == null) {
			synchronized (LockerManagerFactory.class) {
				if (LOCK_MANAGER == null) {
					if (null == lockMode) {
						lockMode = StoreConfig.getLockMode();
					}
					// if not exist the lock mode, throw exception
					if (null != StoreConfig.StoreMode.get(lockMode.name())) {
						LOCK_MANAGER = EnhancedServiceLoader.load(LockManager.class, lockMode.getName());
					}
				}
			}
		}
	}

}
