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* 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
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package org.apache.pulsar.functions.api.examples;
import org.apache.pulsar.functions.api.Context;
import org.apache.pulsar.functions.api.Function;
import java.util.Arrays;
* The classic word count example done using pulsar functions
* Each input message is a sentence that split into words and each word counted.
* The built in counter state is used to keep track of the word count in a
* persistent and consistent manner.
public class WordCountFunction implements Function<String, Void> {
public Void process(String input, Context context) throws Exception {
Arrays.asList(input.split("\\.")).forEach(word -> context.incrCounter(word, 1));
return null;