external/storm-redis/src/main/java/org/apache/storm/redis/trident/state/RedisClusterState.java

/**
 * 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.storm.redis.trident.state;

import backtype.storm.task.IMetricsContext;
import org.apache.storm.redis.common.config.JedisClusterConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.JedisCluster;
import storm.trident.state.State;
import storm.trident.state.StateFactory;

import java.util.Map;

/**
 * Implementation of State for Redis Cluster environment.
 */
public class RedisClusterState implements State {
    /**
     * {@inheritDoc}
     */
    @Override
    public void beginCommit(Long aLong) {
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void commit(Long aLong) {
    }

    /**
     * RedisClusterState.Factory implements StateFactory for Redis Cluster environment.
     *
     * @see StateFactory
     */
    public static class Factory implements StateFactory {
        public static final redis.clients.jedis.JedisPoolConfig DEFAULT_POOL_CONFIG = new redis.clients.jedis.JedisPoolConfig();

        private JedisClusterConfig jedisClusterConfig;

        /**
         * Constructor
         *
         * @param config configuration of JedisCluster
         */
        public Factory(JedisClusterConfig config) {
            this.jedisClusterConfig = config;
        }

        /**
         * {@inheritDoc}
         */
        @Override
        public State makeState(@SuppressWarnings("rawtypes") Map conf, IMetricsContext metrics, int partitionIndex, int numPartitions) {
            JedisCluster jedisCluster = new JedisCluster(jedisClusterConfig.getNodes(),
                                                    jedisClusterConfig.getTimeout(),
                                                    jedisClusterConfig.getMaxRedirections(),
                                                    DEFAULT_POOL_CONFIG);

            return new RedisClusterState(jedisCluster);
        }
    }

    private JedisCluster jedisCluster;

    /**
     * Constructor
     *
     * @param jedisCluster JedisCluster
     */
    public RedisClusterState(JedisCluster jedisCluster) {
        this.jedisCluster = jedisCluster;
    }

    /**
     * Borrows JedisCluster instance.
     * <p></p>
     * Note that you should return borrowed instance when you finish using instance.
     *
     * @return JedisCluster instance
     */
    public JedisCluster getJedisCluster() {
        return this.jedisCluster;
    }

    /**
     * Returns JedisCluster instance to pool.
     *
     * @param jedisCluster JedisCluster instance to return to pool
     */
    public void returnJedisCluster(JedisCluster jedisCluster) {
        //do nothing
    }

}