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Learning Apache Apex

You're reading from   Learning Apache Apex Real-time streaming applications with Apex

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Product type Paperback
Published in Nov 2017
Publisher
ISBN-13 9781788296403
Length 290 pages
Edition 1st Edition
Languages
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Authors (5):
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Munagala V. Ramanath Munagala V. Ramanath
Author Profile Icon Munagala V. Ramanath
Munagala V. Ramanath
David Yan David Yan
Author Profile Icon David Yan
David Yan
Ananth Gundabattula Ananth Gundabattula
Author Profile Icon Ananth Gundabattula
Ananth Gundabattula
Thomas Weise Thomas Weise
Author Profile Icon Thomas Weise
Thomas Weise
Kenneth Knowles Kenneth Knowles
Author Profile Icon Kenneth Knowles
Kenneth Knowles
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Toc

Table of Contents (11) Chapters Close

Preface 1. Introduction to Apex FREE CHAPTER 2. Getting Started with Application Development 3. The Apex Library 4. Scalability, Low Latency, and Performance 5. Fault Tolerance and Reliability 6. Example Project – Real-Time Aggregation and Visualization 7. Example Project – Real-Time Ride Service Data Processing 8. Example Project – ETL Using SQL 9. Introduction to Apache Beam 10. The Future of Stream Processing

Looking up of the zip code and preparing for the windowing operation


The NycTaxiZipFareExtractor operator is the operator that is immediate downstream of the NycTaxiCsvParser explained above. It looks at the pickup latitude-longitude coordinate, looks up the zip code given the latitude-longitude coordinate, and prepares a TimestampedTuple for the KeyedWindowedOperatorImpl operator downstream. The output tuple is of the TimestampedTuple<KeyValPair<String, Double>> type, with the key being the zip code, and the value being the total payment amount.

Here's the definition of the input port of the NycTaxiZipFareExtractor operator:

public final transient DefaultInputPort<Map<String, String>> input = new DefaultInputPort<Map<String, String>>() 
{ 
 @Override 
 public void process(Map<String, String> tuple) 
 { 
   try { 
     String zip = 
       NycLocationUtils.getZip(Double.valueOf(tuple.get("pickup_lat")), 
       Double.valueOf(tuple.get("pickup_lon...
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