org.apache.pulsar.functions.api.examples.window.LoggingWindowFunction Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
*
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package org.apache.pulsar.functions.api.examples.window;
import java.util.Collection;
import org.apache.pulsar.functions.api.Record;
import org.apache.pulsar.functions.api.WindowContext;
import org.apache.pulsar.functions.api.WindowFunction;
import org.slf4j.Logger;
/**
* A function that demonstrates how to redirect logging to a topic.
* In this particular example, for every input string, the function
* does some logging. If --logTopic topic is specified, these log statements
* end up in that specified pulsar topic.
*/
public class LoggingWindowFunction implements WindowFunction {
@Override
public Void process(Collection> inputs, WindowContext context) throws Exception {
Logger log = context.getLogger();
for (Record record : inputs) {
log.info(record + "-window-log");
}
return null;
}
}