/*
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* Copyright 1999-2019 Seata.io Group.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.seata.server.lock.distributed;
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import io.seata.common.loader.EnhancedServiceLoader;
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import io.seata.common.loader.EnhancedServiceNotFoundException;
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import io.seata.core.store.DefaultDistributedLocker;
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import io.seata.core.store.DistributedLocker;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Distributed locker factory
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* @author zhongxiang.wang
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*/
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public class DistributedLockerFactory {
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/**
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* The constant LOGGER.
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*/
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private static final Logger LOGGER = LoggerFactory.getLogger(DistributedLockerFactory.class);
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private static volatile DistributedLocker DISTRIBUTED_LOCKER = null;
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/**
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* Get the distributed locker by lockerType
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*
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* @param lockerType the locker type
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* @return the distributed locker
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*/
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public static DistributedLocker getDistributedLocker(String lockerType) {
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if (DISTRIBUTED_LOCKER == null) {
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synchronized (DistributedLocker.class) {
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if (DISTRIBUTED_LOCKER == null) {
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DistributedLocker distributedLocker = null;
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try {
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if (!"file".equals(lockerType)) {
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distributedLocker = EnhancedServiceLoader.load(DistributedLocker.class, lockerType);
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}
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} catch (EnhancedServiceNotFoundException ex) {
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LOGGER.error("Get distributed locker failed: {}", ex.getMessage(), ex);
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}
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if (distributedLocker == null) {
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distributedLocker = new DefaultDistributedLocker();
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}
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DISTRIBUTED_LOCKER = distributedLocker;
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}
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}
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}
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return DISTRIBUTED_LOCKER;
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}
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public static void cleanLocker() {
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DISTRIBUTED_LOCKER = null;
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}
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}
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