org.apache.storm.testing

Class PythonShellMetricsSpout

java.lang.Object

org.apache.storm.spout.ShellSpout

org.apache.storm.testing.PythonShellMetricsSpout

All Implemented Interfaces:

Serializable, ISpout, IComponent, IRichSpout

public class PythonShellMetricsSpout
extends ShellSpout
implements IRichSpout

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.storm.spout.ShellSpout

LOG

Constructor Summary

Constructors

Constructor and Description
PythonShellMetricsSpout(String[] command)
PythonShellMetricsSpout(String command, String file)

Method Summary

Modifier and Type	Method and Description
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.
void	open(Map<String,Object> conf, TopologyContext context, SpoutOutputCollector collector) Called when a task for this component is initialized within a worker on the cluster.

Methods inherited from class org.apache.storm.spout.ShellSpout

ack, activate, changeChildCWD, close, deactivate, fail, nextTuple, setEnv, shouldChangeChildCWD

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.storm.spout.ISpout

ack, activate, close, deactivate, fail, nextTuple

Constructor Detail

PythonShellMetricsSpout

public PythonShellMetricsSpout(String[] command)

PythonShellMetricsSpout

public PythonShellMetricsSpout(String command,
                               String file)

Method Detail

open

public void open(Map<String,Object> conf,
                 TopologyContext context,
                 SpoutOutputCollector collector)

Description copied from interface: ISpout

Called when a task for this component is initialized within a worker on the cluster. It provides the spout with the environment in which the spout executes.

This includes the:

Specified by:

open in interface ISpout

Overrides:

open in class ShellSpout

Parameters:

conf - The Storm configuration for this spout. This is the configuration provided to the topology merged in with cluster configuration on this machine.

context - 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.

collector - 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.

declareOutputFields

public void declareOutputFields(OutputFieldsDeclarer declarer)

Description copied from interface: IComponent

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

Specified by:

declareOutputFields in interface IComponent

Parameters:

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

getComponentConfiguration

public Map<String,Object> getComponentConfiguration()

Description copied from interface: IComponent

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

Specified by:

getComponentConfiguration in interface IComponent