org.apache.flink.table.examples.java.connectors

Class ChangelogSocketExample

java.lang.Object

org.apache.flink.table.examples.java.connectors.ChangelogSocketExample

public final class ChangelogSocketExample
extends Object

Example for implementing a custom DynamicTableSource and a DecodingFormat.

The example implements a table source with a decoding format that supports changelog semantics.

The SocketDynamicTableFactory illustrates how connector components play together. It can serve as a reference implementation for implementing own connectors and/or formats.

The SocketDynamicTableSource uses a simple single-threaded SourceFunction to open a socket that listens for incoming bytes. The raw bytes are decoded into rows by a pluggable format. The format expects a changelog flag as the first column.

In particular, the example shows how to

• create factories that parse and validate options,
• implement table connectors,
• implement and discover custom formats,
• and use provided utilities such as data structure converters and the FactoryUtil.

Usage: ChangelogSocketExample --hostname <localhost> --port <9999>

Use the following command to ingest data in a terminal:

     nc -lk 9999
     INSERT|Alice|12
     INSERT|Bob|5
     DELETE|Alice|12
     INSERT|Alice|18
 

The result is written to stdout.

Constructor Summary

Constructors

Constructor and Description
ChangelogSocketExample()

Method Summary

Modifier and Type	Method and 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 Detail

ChangelogSocketExample

public ChangelogSocketExample()

Method Detail

main

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

Throws:

Exception