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.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---