Package io.debezium.transforms.scripting

Class Jsr223Engine

java.lang.Object

io.debezium.transforms.scripting.Jsr223Engine

All Implemented Interfaces:

Engine

Direct Known Subclasses:

GraalJsEngine

public class Jsr223Engine
extends Object
implements Engine

An implementation of the expression language evaluator based on JSR 223 scripting languages. The expression receives variables to work with

• key - key of the record
• value - value of the record
• keySchema - schema for key
• valueSchema - schema for value

Author:

Jiri Pechanec

Field Summary

Fields

Modifier and Type	Field	Description
protected ScriptEngine	engine
private String	expression
private CompiledScript	script

Constructor Summary

Constructors

Constructor	Description
Jsr223Engine()

Method Summary

Modifier and Type	Method	Description
void	configure(String language, String expression)	Pre-compiles the expression for repeated execution.
protected void	configureEngine()
protected Map<String,RecordHeader>	doHeaders(org.apache.kafka.connect.connector.ConnectRecord<?> record)
<T> T	eval(org.apache.kafka.connect.connector.ConnectRecord<?> record, Class<T> type)	Calculate a value out of the record.
protected Bindings	getBindings(org.apache.kafka.connect.connector.ConnectRecord<?> record)
protected RecordHeader	header(org.apache.kafka.connect.header.Header header)
protected Object	headers(org.apache.kafka.connect.connector.ConnectRecord<?> record)
protected Object	key(org.apache.kafka.connect.connector.ConnectRecord<?> record)
protected Object	value(org.apache.kafka.connect.connector.ConnectRecord<?> record)

Methods inherited from class java.lang.Object

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

Field Details

expression

private String expression

script

private CompiledScript script

engine

protected ScriptEngine engine

Constructor Details

Jsr223Engine

public Jsr223Engine()

Method Details

configure

public void configure(String language,
 String expression)

Description copied from interface: Engine

Pre-compiles the expression for repeated execution. The method is called once upon the engine initialization.

Specified by:

configure in interface Engine

Parameters:

expression -

configureEngine

protected void configureEngine()

getBindings

protected Bindings getBindings(org.apache.kafka.connect.connector.ConnectRecord<?> record)

key

protected Object key(org.apache.kafka.connect.connector.ConnectRecord<?> record)

value

protected Object value(org.apache.kafka.connect.connector.ConnectRecord<?> record)

header

protected RecordHeader header(org.apache.kafka.connect.header.Header header)

headers

protected Object headers(org.apache.kafka.connect.connector.ConnectRecord<?> record)

doHeaders

protected Map<String,RecordHeader> doHeaders(org.apache.kafka.connect.connector.ConnectRecord<?> record)

eval

public <T> T eval(org.apache.kafka.connect.connector.ConnectRecord<?> record,
 Class<T> type)

Description copied from interface: Engine

Calculate a value out of the record.

Specified by:

eval in interface Engine

Parameters:

record - to be used

Returns:

result of calculation