Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1693#discussion_r97418597
--- Diff:
examples/storm-starter/src/jvm/org/apache/storm/starter/streams/BranchExample.java
---
@@ -0,0 +1,72 @@
+/**
+ * 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.LocalCluster;
+import org.apache.storm.StormSubmitter;
+import org.apache.storm.starter.spout.RandomIntegerSpout;
+import org.apache.storm.streams.Stream;
+import org.apache.storm.streams.StreamBuilder;
+import org.apache.storm.streams.operations.Predicate;
+import org.apache.storm.streams.operations.mappers.ValueMapper;
+import org.apache.storm.utils.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * An example that demonstrates the usage of {@link
Stream#branch(Predicate[])} to split a stream
+ * into multiple branches based on predicates.
+ */
+public class BranchExample {
+ private static final Logger LOG =
LoggerFactory.getLogger(BranchExample.class);
+
+ @SuppressWarnings("unchecked")
+ public static void main(String[] args) throws Exception {
+ StreamBuilder builder = new StreamBuilder();
+ Stream<Integer>[] evenAndOdd = builder
+ /*
+ * Create a stream of random numbers from a spout that
+ * emits random integers by extracting the tuple value at
index 0.
+ */
+ .newStream(new RandomIntegerSpout(), new
ValueMapper<Integer>(0))
+ /*
+ * Split the stream of numbers into streams of
+ * even and odd numbers. The first stream contains even
+ * and the second contains odd numbers.
+ */
+ .branch(x -> (x % 2) == 0,
+ x -> (x % 2) == 1);
+
+ evenAndOdd[0].forEach(x -> LOG.info("EVEN> " + x));
+ evenAndOdd[1].forEach(x -> LOG.info("ODD > " + x));
+
+ Config config = new Config();
+ if (args.length > 0) {
+ config.setNumWorkers(1);
+ StormSubmitter.submitTopologyWithProgressBar(args[0], config,
builder.build());
+ } else {
+ LocalCluster cluster = new LocalCluster();
+ cluster.submitTopology("test", config, builder.build());
--- End diff --
Again Minor: AutoCloseable
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