org.apache.flink.storm.util

Class NullTerminatingSpout

java.lang.Object

org.apache.flink.storm.util.NullTerminatingSpout

All Implemented Interfaces:

Serializable, FiniteSpout, org.apache.storm.spout.ISpout, org.apache.storm.topology.IComponent, org.apache.storm.topology.IRichSpout

public class NullTerminatingSpout
extends Object
implements FiniteSpout

NullTerminatingSpout in a finite spout (ie, implements FiniteSpout interface) that wraps an infinite spout, and returns true in reachedEnd() when the wrapped spout does not emit a tuple in nextTuple() for the first time.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NullTerminatingSpout(org.apache.storm.topology.IRichSpout spout)

Method Summary

Modifier and Type	Method and Description
void	ack(Object msgId)
void	activate()
void	close()
void	deactivate()
void	declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer declarer)
void	fail(Object msgId)
Map<String,Object>	getComponentConfiguration()
void	nextTuple()
void	open(Map conf, org.apache.storm.task.TopologyContext context, org.apache.storm.spout.SpoutOutputCollector collector)
boolean	reachedEnd() When returns true, the spout has reached the end of the stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullTerminatingSpout

public NullTerminatingSpout(org.apache.storm.topology.IRichSpout spout)

Method Detail

open

public void open(Map conf,
                 org.apache.storm.task.TopologyContext context,
                 org.apache.storm.spout.SpoutOutputCollector collector)

Specified by:

open in interface org.apache.storm.spout.ISpout

close

public void close()

Specified by:

close in interface org.apache.storm.spout.ISpout

activate

public void activate()

Specified by:

activate in interface org.apache.storm.spout.ISpout

deactivate

public void deactivate()

Specified by:

deactivate in interface org.apache.storm.spout.ISpout

nextTuple

public void nextTuple()

Specified by:

nextTuple in interface org.apache.storm.spout.ISpout

ack

public void ack(Object msgId)

Specified by:

ack in interface org.apache.storm.spout.ISpout

fail

public void fail(Object msgId)

Specified by:

fail in interface org.apache.storm.spout.ISpout

declareOutputFields

public void declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer declarer)

Specified by:

declareOutputFields in interface org.apache.storm.topology.IComponent

getComponentConfiguration

public Map<String,Object> getComponentConfiguration()

Specified by:

getComponentConfiguration in interface org.apache.storm.topology.IComponent

reachedEnd

public boolean reachedEnd()

Description copied from interface: FiniteSpout

When returns true, the spout has reached the end of the stream.

Specified by:

reachedEnd in interface FiniteSpout

Returns:

true, if the spout's stream reached its end, false otherwise