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
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.

Method Summary

Modifier and Type	Method	Description
void	init(ProcessorContext<KOut,VOut> context)	Initialize this processor with the given context.

Methods inherited from class Object

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

Methods inherited from interface Processor

close, process

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.

State stores attached to this processor are fully restored from their changelog topics before init() is called. However, for stores that report approximate sizes (notably the default RocksDB-backed stores), size estimates such as ReadOnlyKeyValueStore.approximateNumEntries() may not yet reflect post-compaction counts at this point and can include duplicate writes and tombstones replayed during restoration; see that method's Javadoc for details.

Specified by:

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

Parameters:

context - the context; may not be null