examples/storm-starter/src/jvm/org/apache/storm/starter/streams/TypedTupleExample.java

/**
 * 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.storm.starter.streams;

import org.apache.storm.Config;
import org.apache.storm.StormSubmitter;
import org.apache.storm.starter.spout.RandomIntegerSpout;
import org.apache.storm.streams.Pair;
import org.apache.storm.streams.PairStream;
import org.apache.storm.streams.Stream;
import org.apache.storm.streams.StreamBuilder;
import org.apache.storm.streams.operations.mappers.TupleValueMappers;
import org.apache.storm.streams.tuple.Tuple3;
import org.apache.storm.streams.windowing.TumblingWindows;
import org.apache.storm.topology.base.BaseWindowedBolt.Count;

/**
 * An example that illustrates the usage of typed tuples (TupleN<..>) and {@link TupleValueMappers}.
 */
public class TypedTupleExample {

    /**
     * The spout emits sequences of (Integer, Long, Long). TupleValueMapper can be used to extract fields
     * from the values and produce a stream of typed tuple (Tuple3&lt;Integer, Long, Long&gt; in this case.
     */
    public static void main(String[] args) throws Exception {
        StreamBuilder builder = new StreamBuilder();
        Stream<Tuple3<Integer, Long, Long>> stream = builder.newStream(new RandomIntegerSpout(), TupleValueMappers.of(0, 1, 2));

        PairStream<Long, Integer> pairs = stream.mapToPair(t -> Pair.of(t.value2 / 10000, t.value1));

        pairs.window(TumblingWindows.of(Count.of(10))).groupByKey().print();

        String topoName = "test";
        if (args.length > 0) {
            topoName = args[0];
        }
        Config config = new Config();
        config.setNumWorkers(1);
        StormSubmitter.submitTopologyWithProgressBar(topoName, config, builder.build());
    }
}