November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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The application code
Now we will discuss the application code, how it uses these properties, and how custom functions can be defined for use in the SQL queries. The application comprises just a single source file, SampleApplication.java. As discussed in Chapter 2, Getting Started with Application Development, the entry point of an Apex application is a class that implements the StreamingApplication interface and, in particular, the populateDAG() method of that interface. The first part of this method looks like this:
@ApplicationAnnotation(name = "ETLExample") public class SampleApplication implements StreamingApplication { @Override public void populateDAG(DAG dag, Configuration conf) { try { // without this, the application fails at launch ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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