merlimat commented on a change in pull request #1314: PIP-15: Pulsar Functions

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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * with the License.  You may obtain a copy of the License at
+ *
+ *
+ *
+ * Unless required by applicable law or agreed to in writing,
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+package org.apache.pulsar.functions.api.examples;
+import org.apache.pulsar.functions.api.Context;
+import org.apache.pulsar.functions.api.PulsarFunction;
+public class CounterFunction implements PulsarFunction<String, Void> {
+    @Override
+    public Void process(String input, Context context) throws Exception {
 Review comment:
   Would it make sense to add a specialization of `PulsarFunction` interface 
for a void function? 
   In that way, we won't have the `Void` return type with the meaningless 
`return null` .

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