Package org.apache.flink.streaming.examples.dsv2.eventtime

Class CountNewsClicks

java.lang.Object

org.apache.flink.streaming.examples.dsv2.eventtime.CountNewsClicks

public class CountNewsClicks
extends Object

This example illustrates how to count the number of clicks on each news at 1 hour after news publication.

The input consists of a series of CountNewsClicks.NewsEvents, which fall into two categories: news publish and news click. Each CountNewsClicks.NewsEvent contains three components: the event type, the news ID and the timestamp. Notably, there is only one event of type CountNewsClicks.NewsEventType.PUBLISH for each news.

Usage:

• --output <path>The output directory where the Job will write the results. If no output path is provided, the Job will print the results to stdout .

This example shows how to:

• Usage of Event Time extension in DataStream API V2

Please note that if you intend to run this example in an IDE, you must first add the following VM options: "--add-opens=java.base/java.util=ALL-UNNAMED". This is necessary because the module system in JDK 17+ restricts some reflection operations.

Please note that the DataStream API V2 is a new set of APIs, to gradually replace the original DataStream API. It is currently in the experimental stage and is not fully available for production.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CountNewsClicks.CountNewsClicksProcessFunction	This process function will consume CountNewsClicks.NewsEvent and count the number of clicks within 1 hour of the news publication and send the results CountNewsClicks.NewsClicks to the output.
static class	CountNewsClicks.NewsClicks	The CountNewsClicks.NewsClicks represents the number of clicks on news within one hour following its publication.
static class	CountNewsClicks.NewsEvent	The CountNewsClicks.NewsEvent represents an event on news, containing the event type, news id and the timestamp.
static enum	CountNewsClicks.NewsEventType	The type of CountNewsClicks.NewsEvent, note that only one event of type CountNewsClicks.NewsEventType.PUBLISH for each news.

Constructor Summary

Constructors

Constructor	Description
CountNewsClicks()

Method Summary

Modifier and Type	Method	Description
static void	main(String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CountNewsClicks

public CountNewsClicks()

Method Details

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception