/*

 * Copyright 2015 the original author or authors. * * 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 org.springframework.cloud.cluster.redis.lock;import java.util.concurrent.locks.Lock;import org.springframework.cloud.cluster.lock.DistributedLock;import org.springframework.cloud.cluster.lock.LockService;import org.springframework.cloud.cluster.lock.support.DelegatingDistributedLock;import org.springframework.data.redis.connection.RedisConnectionFactory;import org.springframework.integration.redis.util.RedisLockRegistry;/** * { LockService} implementation based on Redis. *  * <p>This implementation delegates to { RedisLockRegistry} from Spring * Integration. *  * Janne Valkealahti * */public class RedisLockService implements LockService {         public static final String DEFAULT_REGISTRY_KEY = "spring-cloud";        private final RedisLockRegistry redisLockRegistry;    /**     * Instantiates a new redis lock service.     *     * connectionFactory the redis connection factory     */    public RedisLockService(RedisConnectionFactory connectionFactory) {         this(connectionFactory, DEFAULT_REGISTRY_KEY);    }    /**     * Instantiates a new redis lock service.     *     * connectionFactory the redis connection factory     * @param registryKey The key prefix for locks.     */    public RedisLockService(RedisConnectionFactory connectionFactory, String registryKey) {         this.redisLockRegistry = new RedisLockRegistry(connectionFactory, registryKey);    }    /**     * Instantiates a new redis lock service.     *     * @param connectionFactory the redis connection factory     * @param expireAfter The expiration in milliseconds.     */    public RedisLockService(RedisConnectionFactory connectionFactory, long expireAfter) {         this.redisLockRegistry = new RedisLockRegistry(connectionFactory, DEFAULT_REGISTRY_KEY, expireAfter);    }        /**     * Instantiates a new redis lock service.     *     * @param connectionFactory the redis connection factory     * @param registryKey The key prefix for locks.     * @param expireAfter The expiration in milliseconds.     */    public RedisLockService(RedisConnectionFactory connectionFactory, String registryKey, long expireAfter) {         this.redisLockRegistry = new RedisLockRegistry(connectionFactory, registryKey, expireAfter);    }        @Override    public DistributedLock obtain(String lockKey) {         Lock lock = redisLockRegistry.obtain(lockKey);        return new DelegatingDistributedLock(lockKey, lock);    }}