Github user tzulitai commented on a diff in the pull request:
https://github.com/apache/flink/pull/1813#discussion_r69408897
--- Diff:
flink-streaming-connectors/flink-connector-redis/src/main/java/org/apache/flink/streaming/connectors/redis/RedisSink.java
---
@@ -0,0 +1,193 @@
+/*
+ * 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 org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
+import
org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisClusterConfig;
+import
org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisConfigBase;
+import
org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisPoolConfig;
+import
org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisSentinelConfig;
+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.RedisCommand;
+import
org.apache.flink.streaming.connectors.redis.common.mapper.RedisDataType;
+import
org.apache.flink.streaming.connectors.redis.common.mapper.RedisCommandDescription;
+import
org.apache.flink.streaming.connectors.redis.common.mapper.RedisMapper;
+
+import org.apache.flink.util.Preconditions;
+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> The sink takes two arguments {@link FlinkJedisConfigBase} and
{@link RedisMapper}.
+ * <p> When {@link FlinkJedisPoolConfig} is passed as the first argument,
+ * the sink will create connection using {@link
redis.clients.jedis.JedisPool}. Please use this when
+ * you want to connect to a single Redis server.
+ * <p> When {@link FlinkJedisSentinelConfig} is passed as the first
argument, the sink will create connection
+ * using {@link redis.clients.jedis.JedisSentinelPool}. Please use this
when you want to connect to Sentinel.
+ * <p> Please use {@link FlinkJedisClusterConfig} as the first argument if
you want to connect to
+ * a Redis Cluster.
+ *
+ * <p>Example:
+ *
+ * <pre>
+ *{@code
+ *public static class RedisExampleMapper implements
RedisMapper<Tuple2<String, String>> {
+ *
+ * private RedisCommand redisCommand;
+ *
+ * public RedisAdditionalDataMapper(RedisCommand redisCommand){
+ * this.redisCommand = redisCommand;
+ * }
+ * public RedisCommandDescription getCommandDescription() {
+ * return new RedisCommandDescription(redisCommand,
REDIS_ADDITIONAL_KEY);
+ * }
+ * public String getKeyFromData(Tuple2<String, String> data) {
+ * return data.f0;
+ * }
+ * public String getValueFromData(Tuple2<String, String> data) {
+ * return data.f1;
+ * }
+ *}
+ *JedisPoolConfig jedisPoolConfig = new JedisPoolConfig.Builder()
+ * .setHost(REDIS_HOST).setPort(REDIS_PORT).build();
+ *new RedisSink<String>(jedisPoolConfig, new
RedisExampleDataMapper(RedisCommand.LPUSH));
+ *}</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.
+ * {@code 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.
+ * {@code additionalKey} used as set name for {@link
RedisDataType#SORTED_SET}
+ */
+ private String additionalKey;
+ private RedisMapper<IN> redisSinkMapper;
+ private RedisCommand redisCommand;
+
+ private FlinkJedisConfigBase flinkJedisConfigBase;
+ private RedisCommandsContainer redisCommandsContainer;
+
+ /**
+ * Creates a new {@link RedisSink} that connects to the Redis Server.
+ *
+ * @param flinkJedisConfigBase The configuration of {@link
FlinkJedisConfigBase}
+ * @param redisSinkMapper This is used to generate Redis command and
key value from incoming elements.
+ */
+ public RedisSink(FlinkJedisConfigBase flinkJedisConfigBase,
RedisMapper<IN> redisSinkMapper) {
+ Preconditions.checkNotNull(flinkJedisConfigBase, "Redis
connection pool config should not be null");
+ Preconditions.checkNotNull(redisSinkMapper, "Redis Mapper can
not be null");
+
Preconditions.checkNotNull(redisSinkMapper.getCommandDescription(), "Redis
Mapper data type description can not be null");
+
+ this.flinkJedisConfigBase = flinkJedisConfigBase;
+
+ this.redisSinkMapper = redisSinkMapper;
+ RedisCommandDescription dataTypeDescription =
redisSinkMapper.getCommandDescription();
--- End diff --
Can we rename this local variable here to `commandTypeDescription` too?
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