backtype.storm.topology
Interface IComponent

All Superinterfaces:

Serializable

All Known Subinterfaces:

IBasicBolt, IBatchBolt<T>, ICommitterTransactionalSpout<X>, IOpaquePartitionedTransactionalSpout<T>, IPartitionedTransactionalSpout<T>, IRichBolt, IRichSpout, IRichStateSpout, ITransactionalSpout<T>, ITridentBatchBolt

All Known Implementing Classes:

BaseBasicBolt, BaseBatchBolt, BaseComponent, BaseOpaquePartitionedTransactionalSpout, BasePartitionedTransactionalSpout, BaseRichBolt, BaseRichSpout, BaseTransactionalBolt, BaseTransactionalSpout, BasicBoltExecutor, BatchBoltExecutor, BatchNumberList, BatchProcessWord, BatchRepeatA, BoltTracker, ClojureBolt, ClojureSpout, CoordinatedBolt, CountingBatchBolt, CountingCommitBolt, DRPCSpout, FeederSpout, FixedTupleSpout, IdentityBolt, JoinResult, KeyedCountingBatchBolt, KeyedCountingCommitterBolt, KeyedFairBolt, KeyedSummingBatchBolt, MasterBatchCoordinator, MemoryTransactionalSpout, OpaqueMemoryTransactionalSpout, OpaquePartitionedTransactionalSpoutExecutor, PartitionedTransactionalSpoutExecutor, PrepareBatchBolt, PrepareRequest, ReturnResults, RichShellBolt, RichShellSpout, RichSpoutBatchTriggerer, SpoutTracker, SubtopologyBolt, TestAggregatesCounter, TestConfBolt, TestEventLogSpout, TestEventOrderCheckBolt, TestGlobalCount, TestPlannerBolt, TestPlannerSpout, TestWordCounter, TestWordSpout, TransactionalSpoutBatchExecutor, TransactionalSpoutCoordinator, TridentBoltExecutor, TridentSpoutCoordinator, TridentSpoutExecutor, TupleCaptureBolt

public interface IComponent
extends Serializable

Common methods for all possible components in a topology. This interface is used when defining topologies using the Java API.

Method Summary

void	declareOutputFields(OutputFieldsDeclarer declarer) Declare the output schema for all the streams of this topology.
Map<String,Object>	getComponentConfiguration() Declare configuration specific to this component.

Method Detail

declareOutputFields

void declareOutputFields(OutputFieldsDeclarer declarer)

Declare the output schema for all the streams of this topology.

Parameters:

declarer - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream

getComponentConfiguration

Map<String,Object> getComponentConfiguration()

Declare configuration specific to this component. Only a subset of the "topology.*" configs can be overridden. The component configuration can be further overridden when constructing the topology using TopologyBuilder