Github user mjsax commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1813#discussion_r67622377
  
    --- Diff: 
flink-streaming-connectors/flink-connector-redis/src/main/java/org/apache/flink/streaming/connectors/redis/RedisSink.java
 ---
    @@ -0,0 +1,235 @@
    +/*
    + * 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.flink.streaming.connectors.redis;
    +
    +import com.google.common.base.Preconditions;
    +
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
    +import 
org.apache.flink.streaming.connectors.redis.common.config.JedisClusterConfig;
    +import 
org.apache.flink.streaming.connectors.redis.common.config.JedisPoolConfig;
    +import 
org.apache.flink.streaming.connectors.redis.common.config.JedisSentinelConfig;
    +import 
org.apache.flink.streaming.connectors.redis.common.container.RedisCommandsContainer;
    +import 
org.apache.flink.streaming.connectors.redis.common.container.RedisCommandsContainerBuilder;
    +import 
org.apache.flink.streaming.connectors.redis.common.mapper.RedisDataType;
    +import 
org.apache.flink.streaming.connectors.redis.common.mapper.RedisDataTypeDescription;
    +import 
org.apache.flink.streaming.connectors.redis.common.mapper.RedisMapper;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.IOException;
    +
    +/**
    + * A sink that delivers data to a Redis channel using the Jedis client.
    + * <p>When creating the sink using first constructor {@link 
#RedisSink(JedisPoolConfig, RedisMapper)}
    + * the sink will create connection using {@link 
redis.clients.jedis.JedisPool}.
    + * <p>When using second constructor {@link #RedisSink(JedisSentinelConfig, 
RedisMapper)} the sink will create connection
    + * using {@link redis.clients.jedis.JedisSentinelPool} to Redis cluster. 
Use this if redis is
    + * configured using sentinels else use the third constructor {@link 
#RedisSink(JedisClusterConfig, RedisMapper)}
    + * which use {@link redis.clients.jedis.JedisCluster} to connect to Redis 
cluster.
    + *
    + * <p>Example:
    + *
    + * <pre>
    + *{@code
    + *public static class RedisExampleDataMapper implements 
RedisMapper<Tuple2<String, String>> {
    + *    public RedisDataTypeDescription getDataTypeDescription() {
    + *        return new RedisDataTypeDescription(dataType, 
REDIS_ADDITIONAL_KEY);
    + *    }
    + *    public String getKeyFromData(Tuple2 data) {
    + *        return String.valueOf(data.f0);
    + *    }
    + *    public String getValueFromData(Tuple2 data) {
    + *        return String.valueOf(data.f1);
    + *    }
    + *}
    + *JedisPoolConfig jedisPoolConfig = new JedisPoolConfig.Builder()
    + *    .setHost(REDIS_HOST).setPort(REDIS_PORT).build();
    + *new RedisSink<String>(jedisPoolConfig, new RedisExampleDataMapper());
    + *}</pre>
    + *
    + * @param <IN> Type of the elements emitted by this sink
    + */
    +public class RedisSink<IN> extends RichSinkFunction<IN> {
    +
    +   private static final long serialVersionUID = 1L;
    +
    +   private static final Logger LOG = 
LoggerFactory.getLogger(RedisSink.class);
    +
    +   /**
    +    * This additional key needed for {@link RedisDataType#HASH} and {@link 
RedisDataType#SORTED_SET}.
    +    * Other {@link RedisDataType} works only with two variable i.e. name 
of the list and value to be added.
    +    * But for {@link RedisDataType#HASH} and {@link 
RedisDataType#SORTED_SET} we need three variables.
    +    * <p>For {@link RedisDataType#HASH} we need hash name, hash key and 
element.
    +    * additionalKey used as hash name for {@link RedisDataType#HASH}
    +    * <p>For {@link RedisDataType#SORTED_SET} we need set name, the 
element and it's score.
    +    * additionalKey used as set name for {@link RedisDataType#SORTED_SET}
    +    */
    +   private String additionalKey;
    +   private RedisMapper<IN> redisSinkMapper;
    +   private RedisDataType redisDataType;
    +
    +   private JedisPoolConfig jedisPoolConfig;
    +   private JedisSentinelConfig jedisSentinelConfig;
    +   private JedisClusterConfig jedisClusterConfig;
    +
    +   private RedisCommandsContainer redisCommandsContainer;
    +
    +   /**
    +    * Creates a new RedisSink that connects to the Redis Server.
    +    *
    +    * @param jedisPoolConfig The configuration of {@link 
org.apache.flink.streaming.connectors.redis.common.config.JedisPoolConfig}
    +    * @param redisSinkMapper This used for generate redis command and key 
value from incoming elements
    +    */
    +   public RedisSink(JedisPoolConfig jedisPoolConfig, RedisMapper<IN> 
redisSinkMapper) {
    +           Preconditions.checkNotNull(jedisPoolConfig, "Redis connection 
pool config should not be Null");
    +           Preconditions.checkNotNull(redisSinkMapper, "Redis Mapper can 
not be null");
    +
    +           this.redisSinkMapper = redisSinkMapper;
    +           this.jedisPoolConfig = jedisPoolConfig;
    +           RedisDataTypeDescription dataTypeDescription = 
redisSinkMapper.getDataTypeDescription();
    +           this.redisDataType = dataTypeDescription.getDataType();
    +           this.additionalKey = dataTypeDescription.getAdditionalKey();
    +
    +   }
    +
    +   /**
    +    * Creates a new RedisSink that connects to the Redis Sentinels.
    +    *
    +    * @param jedisSentinelConfig The configuration of {@link 
org.apache.flink.streaming.connectors.redis.common.config.JedisSentinelConfig}
    +    * @param redisSinkMapper This used for generate redis command and key 
value from incoming elements
    +    */
    +   public RedisSink(JedisSentinelConfig jedisSentinelConfig, 
RedisMapper<IN> redisSinkMapper) {
    +           Preconditions.checkNotNull(jedisSentinelConfig, "Redis Sentinel 
connection pool config should not be Null");
    +           Preconditions.checkNotNull(redisSinkMapper, "Redis Mapper can 
not be null");
    +
    +           this.redisSinkMapper = redisSinkMapper;
    +           this.jedisSentinelConfig = jedisSentinelConfig;
    +           RedisDataTypeDescription dataTypeDescription = 
redisSinkMapper.getDataTypeDescription();
    +           this.redisDataType = dataTypeDescription.getDataType();
    +           this.additionalKey = dataTypeDescription.getAdditionalKey();
    +
    +   }
    +
    +   /**
    +    * Creates a new RedisSink that connects to the Redis Cluster.
    +    *
    +    * @param jedisClusterConfig The configuration of {@link 
org.apache.flink.streaming.connectors.redis.common.config.JedisClusterConfig}
    +    * @param redisSinkMapper This used for generate redis command and key 
value from incoming elements
    +    */
    +   public RedisSink(JedisClusterConfig jedisClusterConfig, RedisMapper<IN> 
redisSinkMapper) {
    +           Preconditions.checkNotNull(jedisClusterConfig, "Redis cluster 
config should not be Null");
    +           Preconditions.checkNotNull(redisSinkMapper, "Redis Mapper can 
not be null");
    +
    +           this.redisSinkMapper = redisSinkMapper;
    +           this.jedisClusterConfig = jedisClusterConfig;
    +           RedisDataTypeDescription dataTypeDescription = 
redisSinkMapper.getDataTypeDescription();
    +           this.redisDataType = dataTypeDescription.getDataType();
    +           this.additionalKey = dataTypeDescription.getAdditionalKey();
    +
    +   }
    +
    +   /**
    +    * Called when new data arrives to the sink, and forwards it to Redis 
channel.
    +    * <p> If redis data type is {@link RedisDataType#HASH} Redis HSET 
command will be applied.
    +    * <p> If redis data type is {@link RedisDataType#LIST} Redis RPUSH 
command will be applied.
    +    * <p> If redis data type is {@link RedisDataType#SET} Redis SADD 
command will be applied.
    +    * <p> If redis data type is {@link RedisDataType#PUBSUB} Redis PUBLISH 
command will be applied.
    +    * <p> If redis data type is {@link RedisDataType#STRING} Redis SET 
command will be applied.
    +    * <p> If redis data type is {@link RedisDataType#HYPER_LOG_LOG} Redis 
PFADD command will be applied.
    +    * <p> If redis data type is {@link RedisDataType#SORTED_SET} Redis 
ZADD command will be applied.
    +    *
    +    * @param input The incoming data
    +    */
    +   @Override
    +   public void invoke(IN input) throws Exception {
    +           String key = redisSinkMapper.getKeyFromData(input);
    +           String value = redisSinkMapper.getValueFromData(input);
    +
    +           switch (redisDataType) {
    +                   case HASH:
    +                           
this.redisCommandsContainer.hset(this.additionalKey, key, value);
    +                           break;
    +
    +                   case LIST:
    +                           this.redisCommandsContainer.rpush(key, value);
    +                           break;
    +
    +                   case SET:
    +                           this.redisCommandsContainer.sadd(key, value);
    +                           break;
    +
    +                   case PUBSUB:
    +                           this.redisCommandsContainer.publish(key, value);
    +                           break;
    +
    +                   case STRING:
    +                           this.redisCommandsContainer.set(key, value);
    +                           break;
    +
    +                   case HYPER_LOG_LOG:
    +                           this.redisCommandsContainer.pfadd(key, value);
    +                           break;
    +
    +                   case SORTED_SET:
    +                           
this.redisCommandsContainer.zadd(this.additionalKey, value, key);
    +                           break;
    +
    +                   default:
    +                           throw new IllegalArgumentException("Cannot 
process such data type: " + redisDataType);
    +           }
    +
    +   }
    +
    +   /**
    +    * Initializes the connection to Redis by either cluster or sentinels 
or single server
    +    *
    +    * @throws IllegalArgumentException if jedisPoolConfig, 
jedisClusterConfig and jedisSentinelConfig all are null
    +     */
    +   @Override
    +   public void open(Configuration parameters) throws Exception {
    +           if (jedisPoolConfig != null) {
    +                   this.redisCommandsContainer = 
RedisCommandsContainerBuilder.build(jedisPoolConfig);
    +           } else if (jedisClusterConfig != null) {
    +                   this.redisCommandsContainer = 
RedisCommandsContainerBuilder.build(jedisClusterConfig);
    +           } else if (jedisSentinelConfig != null) {
    +                   this.redisCommandsContainer = 
RedisCommandsContainerBuilder.build(jedisSentinelConfig);
    +           } else {
    +                   throw new IllegalArgumentException("Jedis configuration 
not found");
    +           }
    +   }
    +
    +   /**
    +    * Closes commands container
    +    * @throws IOException if command container is unable to close.
    +    */
    +   @Override
    +   public void close() throws IOException {
    +           if (redisCommandsContainer != null) {
    +                   try {
    +                           redisCommandsContainer.close();
    +                   } catch (IOException e) {
    --- End diff --
    
    Do we need to catch and log here? As exception is re-thrown there is no 
advantage in catch+log.


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