Github user mjsax commented on a diff in the pull request:
https://github.com/apache/flink/pull/1813#discussion_r58111485
--- Diff:
flink-streaming-connectors/flink-connector-redis/src/main/java/org/apache/flink/streaming/connectors/redis/RedisSink.java
---
@@ -0,0 +1,224 @@
+/*
+ * 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.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 redis.clients.jedis.exceptions.JedisException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * 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}.
+ *
+ * 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>>{
+ * @Override
+ * public RedisDataTypeDescription
getDataTypeDescription() {
+ * return new RedisDataTypeDescription(dataType,
REDIS_ADDITIONAL_KEY);
+ * }
+ * @Override
+ * public String getKeyFromData(Tuple2 data) {
+ * return String.valueOf(data.f0);
+ * }
+ *
+ * @Override
+ * 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);
+
+ 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 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
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
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.
+ *
+ * @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 Exception
+ */
+ @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 Exception
+ */
+ @Override
+ public void close() throws Exception {
+ if (redisCommandsContainer != null){
+ try {
+ redisCommandsContainer.close();
+ } catch (JedisException e) {
+ if (LOG.isErrorEnabled()) {
+ LOG.error("failed to close Redis
Commands Container");
--- End diff --
Maybe it would be good to log the `JedisException`: `LOG.errer("...", e);`
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