org.apache.storm.trident.spout

Class RichSpoutBatchExecutor

java.lang.Object

org.apache.storm.trident.spout.RichSpoutBatchExecutor

All Implemented Interfaces:

Serializable, ITridentDataSource, ITridentSpout<Object>

public class RichSpoutBatchExecutor
extends Object
implements ITridentSpout<Object>

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.storm.trident.spout.ITridentSpout

ITridentSpout.BatchCoordinator<X>, ITridentSpout.Emitter<X>

Field Summary

Fields

Modifier and Type	Field and Description
static String	MAX_BATCH_SIZE_CONF

Constructor Summary

Constructors

Constructor and Description
RichSpoutBatchExecutor(IRichSpout spout)

Method Summary

Modifier and Type	Method and Description
Map<String,Object>	getComponentConfiguration()
ITridentSpout.BatchCoordinator<Object>	getCoordinator(String txStateId, Map<String,Object> conf, TopologyContext context) The coordinator for a TransactionalSpout runs in a single thread and indicates when batches of tuples should be emitted.
ITridentSpout.Emitter<Object>	getEmitter(String txStateId, Map<String,Object> conf, TopologyContext context) The emitter for a TransactionalSpout runs as many tasks across the cluster.
Fields	getOutputFields()

Methods inherited from class java.lang.Object

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

Field Detail

MAX_BATCH_SIZE_CONF

public static final String MAX_BATCH_SIZE_CONF

See Also:

Constant Field Values

Constructor Detail

RichSpoutBatchExecutor

public RichSpoutBatchExecutor(IRichSpout spout)

Method Detail

getComponentConfiguration

public Map<String,Object> getComponentConfiguration()

Specified by:

getComponentConfiguration in interface ITridentSpout<Object>

getOutputFields

public Fields getOutputFields()

Specified by:

getOutputFields in interface ITridentSpout<Object>

getCoordinator

public ITridentSpout.BatchCoordinator<Object> getCoordinator(String txStateId,
                                                             Map<String,Object> conf,
                                                             TopologyContext context)

Description copied from interface: ITridentSpout

The coordinator for a TransactionalSpout runs in a single thread and indicates when batches of tuples should be emitted. The Coordinator that you provide in a TransactionalSpout provides metadata for each transaction so that the transactions can be replayed in case of failure.

Two instances are requested, one on the master batch coordinator where isReady() is called, and an instance in the coordinator bolt which is used for all other operations. The two instances do not necessarily share a worker JVM.

Specified by:

getCoordinator in interface ITridentSpout<Object>

Parameters:

txStateId - stream id

conf - Storm config map

context - topology context

Returns:

spout coordinator instance

getEmitter

public ITridentSpout.Emitter<Object> getEmitter(String txStateId,
                                                Map<String,Object> conf,
                                                TopologyContext context)

Description copied from interface: ITridentSpout

The emitter for a TransactionalSpout runs as many tasks across the cluster. Emitters are responsible for emitting batches of tuples for a transaction and must ensure that the same batch of tuples is always emitted for the same transaction id.

All emitter tasks get the same transaction metadata. The topology context parameter contains the instance task id that can be used to distribute the work across the tasks.

Specified by:

getEmitter in interface ITridentSpout<Object>

Parameters:

txStateId - stream id

conf - Storm config map

context - topology context

Returns:

spout emitter