org.apache.storm.testing

Class PythonShellMetricsBolt

java.lang.Object

org.apache.storm.task.ShellBolt

org.apache.storm.testing.PythonShellMetricsBolt

All Implemented Interfaces:

Serializable, IBolt, IComponent, IRichBolt

public class PythonShellMetricsBolt
extends ShellBolt
implements IRichBolt

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.storm.task.ShellBolt

HEARTBEAT_STREAM_ID, LOG

Constructor Summary

Constructors

Constructor and Description
PythonShellMetricsBolt(String[] command)

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	prepare(Map stormConf, TopologyContext context, OutputCollector collector) Called when a task for this component is initialized within a worker on the cluster.

Methods inherited from class org.apache.storm.task.ShellBolt

changeChildCWD, cleanup, execute, 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.task.IBolt

cleanup, execute

Constructor Detail

PythonShellMetricsBolt

public PythonShellMetricsBolt(String[] command)

Method Detail

prepare

public void prepare(Map stormConf,
                    TopologyContext context,
                    OutputCollector collector)

Description copied from interface: IBolt

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

This includes the:

Specified by:

prepare in interface IBolt

Overrides:

prepare in class ShellBolt

Parameters:

stormConf - The Storm configuration for this bolt. 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 bolt. Tuples can be emitted at any time, including the prepare and cleanup methods. The collector is thread-safe and should be saved as an instance variable of this bolt 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