Flink Inherited POJO Example

Job.java

package com.chiwanpark.flink;

/**
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.
 */

import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.tuple.Tuple2;

import java.util.Arrays;

/**
 * Skeleton for a Flink Job.
 *
 * For a full example of a Flink Job, see the WordCountJob.java file in the
 * same package/directory or have a look at the website.
 *
 * You can also generate a .jar file that you can submit on your Flink
 * cluster.
 * Just type
 * 		mvn clean package
 * in the projects root directory.
 * You will find the jar in
 * 		target/flink-quickstart-0.1-SNAPSHOT-Sample.jar
 *
 */
public class Job {

    public static class MyParent {
        private int sessionId;

        public MyParent() {
        }

        public int getSessionId() {
            return sessionId;
        }

        public void setSessionId(int sessionId) {
            this.sessionId = sessionId;
        }
    }

    public static class SourceA extends MyParent {
        public SourceA() {
            super();
        }

        public SourceA(int sessionId) {
            super();

            setSessionId(sessionId);
        }

        @Override
        public String toString() {
            return "SourceA{" + getSessionId() + "}";
        }
    }

    public static class SourceB extends MyParent {
        public SourceB() {
            super();
        }

        public SourceB(int sessionId) {
            super();

            setSessionId(sessionId);
        }

        @Override
        public String toString() {
            return "SourceB{" + getSessionId() + "}";
        }
    }

    public static void main(String[] args) throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<SourceA> sourceA = env.fromCollection(Arrays.asList(new SourceA(1), new SourceA(2)));
        DataSet<SourceB> sourceB = env.fromCollection(Arrays.asList(new SourceB(1), new SourceB(2)));

        DataSet<Tuple2<SourceA, SourceB>> joined = sourceA.join(sourceB).where("sessionId").equalTo("sessionId");

        joined.print();
    }
}