Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/1086#discussion_r52136625
--- Diff:
examples/storm-starter/src/jvm/org/apache/storm/starter/trident/TridentMinMaxOperationsTopology.java
---
@@ -0,0 +1,208 @@
+/**
+ * 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.
+ */
+package org.apache.storm.starter.trident;
+
+import org.apache.storm.Config;
+import org.apache.storm.LocalCluster;
+import org.apache.storm.StormSubmitter;
+import org.apache.storm.generated.StormTopology;
+import org.apache.storm.trident.Stream;
+import org.apache.storm.trident.TridentTopology;
+import org.apache.storm.trident.operation.BaseFunction;
+import org.apache.storm.trident.operation.TridentCollector;
+import org.apache.storm.trident.operation.builtin.Debug;
+import org.apache.storm.trident.testing.FixedBatchSpout;
+import org.apache.storm.trident.testing.NumberGeneratorSpout;
+import org.apache.storm.trident.tuple.TridentTuple;
+import org.apache.storm.tuple.Fields;
+import org.apache.storm.tuple.Values;
+import org.apache.storm.utils.Utils;
+
+import java.io.Serializable;
+import java.util.Comparator;
+import java.util.List;
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * This class contains different usages of minBy, maxBy, min and max
operations on trident streams.
+ *
+ */
+public class TridentMinMaxOperationsTopology {
+ public static class Split extends BaseFunction {
+ @Override
+ public void execute(TridentTuple tuple, TridentCollector
collector) {
+ String sentence = tuple.getString(0);
+ for (String word : sentence.split(" ")) {
+ collector.emit(new Values(word));
+ }
+ }
+ }
+
+ public static StormTopology buildIdsTopology() {
+ NumberGeneratorSpout spout = new NumberGeneratorSpout(new
Fields("id"), 10, 1000);
+
+ TridentTopology topology = new TridentTopology();
+ Stream wordsStream = topology.newStream("numgen-spout", spout).
+ each(new Fields("id"), new Debug("##### ids"));
+
+ wordsStream.minBy("id").
+ each(new Fields("id"), new Debug("#### min-id"));
+
+ wordsStream.maxBy("id").
+ each(new Fields("id"), new Debug("#### max-id"));
+
+ return topology.build();
+ }
+
+ public static StormTopology buildWordsTopology() {
+ FixedBatchSpout spout = new FixedBatchSpout(new
Fields("sentence"), 3, new Values("the cow jumped over the moon"),
+ new Values("the man went to the store and bought some
candy"), new Values("four score and seven years ago"),
+ new Values("how many apples can you eat"), new Values("to
be or not to be the person"));
+ spout.setCycle(true);
+
+ TridentTopology topology = new TridentTopology();
+ Stream wordsStream = topology.newStream("spout1",
spout).parallelismHint(16).
+ each(new Fields("sentence"), new Split(), new
Fields("word")).
+ each(new Fields("word"), new Debug("##### words"));
+
+ wordsStream.minBy("word").
+ each(new Fields("word"), new Debug("#### lowest word"));
+
+ wordsStream.maxBy("word").
+ each(new Fields("word"), new Debug("#### highest word"));
+
+ return topology.build();
+ }
+
+ public static StormTopology buildVehiclesTopology() {
--- End diff --
Maybe add some short description of what this does.
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