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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High-level Stream Java API
The high-level Apex Stream Java API provides an abstraction from the lower level DAG API. It is a declarative, fluent style API that is easier to learn for someone new to Apex. Instead of identifying individual operators, the developer works with methods on the stream interface to specify the transformations.
The API will internally keep track of the operator(s) needed for each of the transformations and eventually translate it into the lower level DAG. The high-level API is part of the Apex library and outside of the Apex engine.
Here is the Word Count example application written with the high-level API (using Java 8 syntax):
StreamFactory.fromFolder("/tmp") .flatMap(input -> Arrays.asList(input.split(" ")), name("Words")) ...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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