io.debezium.transforms

Class Filter<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

java.lang.Object

io.debezium.transforms.Filter<R>

Type Parameters:

R - the subtype of ConnectRecord on which this transformation will operate

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.kafka.common.Configurable, org.apache.kafka.connect.transforms.Transformation<R>

@Incubating
public class Filter<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>
extends Object
implements org.apache.kafka.connect.transforms.Transformation<R>

This SMT should allow user to filter out records depending on an expression and language configured. Current implementation supports only Groovy scripting language.

The SMT will instantiate an scripting engine encapsulated in Engine interface in configure phase. It will try to pre-parse the expression if it is allowed by the engine and than the expression is evaluated for every record incoming.

The engine will extract key, value and its schemas and will inject them as variables into the engine. The mapping is unique for each expression language.

Author:

Jiri Pechanec

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Filter.NullHandling

Field Summary

Fields

Modifier and Type	Field and Description
private Engine	engine
static Field	EXPRESSION
private static String	GRAAL_JS_ENGINE
private static String	JAVAX_SCRIPT_ENGINE_PREFIX
static Field	LANGUAGE
private static org.slf4j.Logger	LOGGER
static Field	NULL_HANDLING
private Filter.NullHandling	nullHandling

Constructor Summary

Constructors

Constructor and Description
Filter()

Method Summary

Modifier and Type	Method and Description
R	apply(R record)
void	close()
org.apache.kafka.common.config.ConfigDef	config()
void	configure(Map<String,?> configs)

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

private static final org.slf4j.Logger LOGGER

JAVAX_SCRIPT_ENGINE_PREFIX

private static final String JAVAX_SCRIPT_ENGINE_PREFIX

See Also:

Constant Field Values

GRAAL_JS_ENGINE

private static final String GRAAL_JS_ENGINE

See Also:

Constant Field Values

LANGUAGE

public static final Field LANGUAGE

EXPRESSION

public static final Field EXPRESSION

NULL_HANDLING

public static final Field NULL_HANDLING

engine

private Engine engine

nullHandling

private Filter.NullHandling nullHandling

Constructor Detail

Filter

public Filter()

Method Detail

configure

public void configure(Map<String,?> configs)

Specified by:

configure in interface org.apache.kafka.common.Configurable

apply

public R apply(R record)

Specified by:

apply in interface org.apache.kafka.connect.transforms.Transformation<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

config

public org.apache.kafka.common.config.ConfigDef config()

Specified by:

config in interface org.apache.kafka.connect.transforms.Transformation<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface org.apache.kafka.connect.transforms.Transformation<R extends org.apache.kafka.connect.connector.ConnectRecord<R>>