Package org.apache.kafka.streams.processor.api

Class ContextualProcessor<KIn,VIn,KOut,VOut>

java.lang.Object

org.apache.kafka.streams.processor.api.ContextualProcessor<KIn,VIn,KOut,VOut>

Type Parameters:

KIn - the type of input keys

VIn - the type of input values

KOut - the type of output keys

VOut - the type of output values

All Implemented Interfaces:

Processor<KIn,VIn,KOut,VOut>

public abstract class ContextualProcessor<KIn,VIn,KOut,VOut>
extends Object
implements Processor<KIn,VIn,KOut,VOut>

An abstract implementation of Processor that manages the ProcessorContext instance and provides default no-op implementation of Processor.close().

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ContextualProcessor()

Method Summary

Modifier and Type	Method	Description
protected final ProcessorContext<KOut,VOut>	context()	Get the processor's context set during initialization.
void	init(ProcessorContext<KOut,VOut> context)	Initialize this processor with the given context.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.kafka.streams.processor.api.Processor

close, process

Constructor Details

ContextualProcessor

protected ContextualProcessor()

Method Details

init

public void init(ProcessorContext<KOut,VOut> context)

Description copied from interface: Processor

Initialize this processor with the given context. The framework ensures this is called once per processor when the topology that contains it is initialized. When the framework is done with the processor, Processor.close() will be called on it; the framework may later re-use the processor by calling #init() again.

The provided context can be used to access topology and record meta data, to schedule a method to be called periodically and to access attached StateStores.

Specified by:

init in interface Processor<KIn,VIn,KOut,VOut>

Parameters:

context - the context; may not be null

context

protected final ProcessorContext<KOut,VOut> context()

Get the processor's context set during initialization.

Returns:

the processor context; null only when called prior to initialization.