org.apache.storm.streams.processors

Interface Processor<T>

Type Parameters:

T - the type of the input that is processed

All Superinterfaces:

Serializable

All Known Implementing Classes:

AggregateByKeyProcessor, AggregateProcessor, BranchProcessor, CoGroupByKeyProcessor, FilterProcessor, FlatMapProcessor, FlatMapValuesProcessor, ForEachProcessor, JoinProcessor, MapProcessor, MapValuesProcessor, MergeAggregateByKeyProcessor, MergeAggregateProcessor, PeekProcessor, ReduceByKeyProcessor, ReduceProcessor, StateQueryProcessor, UpdateStateByKeyProcessor

@InterfaceStability.Unstable
public interface Processor<T>
extends Serializable

A processor processes a stream of elements and produces some result.

Method Summary

Modifier and Type	Method and Description
void	execute(T input, String streamId) Executes some operations on the input and possibly emits some results.
void	init(ProcessorContext context) Initializes the processor.
void	punctuate(String stream) Punctuation marks end of a batch which can be used to compute and pass the results of one stage in the pipeline to the next.

Method Detail

init

void init(ProcessorContext context)

Initializes the processor. This is typically invoked from the underlying storm bolt's prepare method.

Parameters:

context - the processor context

execute

void execute(T input,
             String streamId)

Executes some operations on the input and possibly emits some results.

Parameters:

input - the input to be processed

streamId - the source stream id from where the input is received

punctuate

void punctuate(String stream)

Punctuation marks end of a batch which can be used to compute and pass the results of one stage in the pipeline to the next. For e.g. emit the results of an aggregation.

Parameters:

stream - the stream id on which the punctuation arrived