/*
* 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.kafka;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.function.sink.SinkFunction;
import org.apache.flink.streaming.api.function.source.SourceFunction;
import org.apache.flink.util.Collector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class KafkaTopology {
private static final Logger LOG = LoggerFactory.getLogger(KafkaTopology.class);
public static final class MySource implements SourceFunction<String> {
private static final long serialVersionUID = 1L;
@Override
public void invoke(Collector<String> collector) throws Exception {
for (int i = 0; i < 10; i++) {
collector.collect(new String(Integer.toString(i)));
}
collector.collect(new String("q"));
}
}
public static final class MyKafkaSource extends KafkaSource<String> {
private static final long serialVersionUID = 1L;
public MyKafkaSource(String zkQuorum, String groupId, String topicId, int numThreads) {
super(zkQuorum, groupId, topicId, numThreads);
}
@Override
public String deserialize(byte[] msg) {
String s = new String(msg);
if (s.equals("q")) {
closeWithoutSend();
}
return new String(s);
}
}
public static final class MyKafkaSink extends KafkaSink<String, String> {
private static final long serialVersionUID = 1L;
public MyKafkaSink(String topicId, String brokerAddr) {
super(topicId, brokerAddr);
}
@Override
public String serialize(String tuple) {
if (tuple.equals("q")) {
sendAndClose();
}
return tuple;
}
}
public static final class MyKafkaPrintSink implements SinkFunction<String> {
private static final long serialVersionUID = 1L;
@Override
public void invoke(String value) {
if (LOG.isInfoEnabled()) {
LOG.info("String: <{}> arrived from Kafka", value);
}
}
}
private static final int SOURCE_PARALELISM = 1;
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env = StreamExecutionEnvironment.createLocalEnvironment(1);
@SuppressWarnings("unused")
DataStream<String> stream1 = env
.addSource(new MyKafkaSource("localhost:2181", "group", "test", 1), SOURCE_PARALELISM)
.addSink(new MyKafkaPrintSink());
@SuppressWarnings("unused")
DataStream<String> stream2 = env
.addSource(new MySource())
.addSink(new MyKafkaSink("test", "localhost:9092"));
env.execute();
}
}