public class TestSpout extends java.lang.Object implements IRichSpout
Constructor and Description |
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TestSpout() |
Modifier and Type | Method and Description |
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void |
ack(java.lang.Object o)
Heron has determined that the tuple emitted by this spout with the msgId identifier
has been fully processed.
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void |
activate()
Called when a spout has been activated out of a deactivated mode.
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void |
close()
Called when an ISpout is going to be shutdown.
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void |
deactivate()
Called when a spout has been deactivated.
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void |
declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer)
Declare the output schema for all the streams of this topology.
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void |
fail(java.lang.Object o)
The tuple emitted by this spout with the msgId identifier has failed to be
fully processed.
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java.util.Map<java.lang.String,java.lang.Object> |
getComponentConfiguration()
Declare configuration specific to this component.
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void |
nextTuple()
When this method is called, Heron is requesting that the Spout emit tuples to the
output collector.
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void |
open(java.util.Map<java.lang.String,java.lang.Object> map,
TopologyContext topologyContext,
SpoutOutputCollector spoutOutputCollector)
Called when a task for this component is initialized within a worker on the cluster.
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public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer)
IComponent
declareOutputFields
in interface IComponent
outputFieldsDeclarer
- this is used to declare output stream ids, output fields, and whether or not each output stream is a direct streampublic java.util.Map<java.lang.String,java.lang.Object> getComponentConfiguration()
IComponent
TopologyBuilder
getComponentConfiguration
in interface IComponent
public void open(java.util.Map<java.lang.String,java.lang.Object> map, TopologyContext topologyContext, SpoutOutputCollector spoutOutputCollector)
ISpout
This includes the:
open
in interface ISpout
map
- The Heron configuration for this spout. This is the configuration provided to the topology merged in with cluster configuration on this machine.topologyContext
- This object can be used to get information about this task's place within the topology, including the task id and component id of this task, input and output information, etc.spoutOutputCollector
- The collector is used to emit tuples from this spout. Tuples can be emitted at any time, including the open and close methods. The collector is thread-safe and should be saved as an instance variable of this spout object.public void close()
ISpout
The one context where close is guaranteed to be called is a topology is killed when running Heron in simulator.
public void activate()
ISpout
public void deactivate()
ISpout
deactivate
in interface ISpout
public void nextTuple()
ISpout
public void ack(java.lang.Object o)
ISpout
public void fail(java.lang.Object o)
ISpout