Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/storm/pull/2089#discussion_r113429561
--- Diff:
examples/storm-starter/src/jvm/org/apache/storm/starter/LambdaTopology.java ---
@@ -0,0 +1,75 @@
+/**
+ * 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;
+
+import org.apache.storm.Config;
+import org.apache.storm.topology.ConfigurableTopology;
+import org.apache.storm.topology.TopologyBuilder;
+import org.apache.storm.tuple.Values;
+
+import java.io.Serializable;
+import java.util.UUID;
+
+public class LambdaTopology extends ConfigurableTopology {
+ public static void main(String[] args) {
+ ConfigurableTopology.start(new LambdaTopology(), args);
+ }
+
+ @Override
+ protected int run(String[] args) throws Exception {
+ TopologyBuilder builder = new TopologyBuilder();
+
+ // example. spout1: generate random strings
+ // bolt1: get the first part of a string
+ // bolt2: output the tuple
+
+ // NOTE: Variable used in lambda expression should be final or
effectively final
+ // (or it will cause compilation error),
+ // and variable type should implement the Serializable interface
if it isn't primitive type
+ // (or it will cause not serializable exception).
+ Prefix prefix = new Prefix("Hello lambda:");
--- End diff --
Any reason why this is not just a String?
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