Package org.apache.storm.starter
Class MultiThreadWordCountTopology.MultiThreadedSplitSentence
java.lang.Object
org.apache.storm.starter.MultiThreadWordCountTopology.MultiThreadedSplitSentence
- All Implemented Interfaces:
Serializable
,IBolt
,IComponent
,IRichBolt
- Enclosing class:
- MultiThreadWordCountTopology
public static class MultiThreadWordCountTopology.MultiThreadedSplitSentence
extends Object
implements IRichBolt
- See Also:
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
cleanup()
Called when an IBolt is going to be shutdown.void
declareOutputFields
(OutputFieldsDeclarer declarer) Declare the output schema for all the streams of this topology.void
Process a single tuple of input.Declare configuration specific to this component.void
prepare
(Map<String, Object> topoConf, TopologyContext context, OutputCollector collector) Called when a task for this component is initialized within a worker on the cluster.
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Constructor Details
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MultiThreadedSplitSentence
public MultiThreadedSplitSentence()
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Method Details
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prepare
public void prepare(Map<String, Object> topoConf, 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 interfaceIBolt
- Parameters:
topoConf
- 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.
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execute
Description copied from interface:IBolt
Process a single tuple of input. The Tuple object contains metadata on it about which component/stream/task it came from. The values of the Tuple can be accessed using Tuple#getValue. The IBolt does not have to process the Tuple immediately. It is perfectly fine to hang onto a tuple and process it later (for instance, to do an aggregation or join).Tuples should be emitted using the OutputCollector provided through the prepare method. It is required that all input tuples are acked or failed at some point using the OutputCollector. Otherwise, Storm will be unable to determine when tuples coming off the spouts have been completed.
For the common case of acking an input tuple at the end of the execute method, see IBasicBolt which automates this.
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declareOutputFields
Description copied from interface:IComponent
Declare the output schema for all the streams of this topology.- Specified by:
declareOutputFields
in interfaceIComponent
- Parameters:
declarer
- this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream
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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 usingTopologyBuilder
- Specified by:
getComponentConfiguration
in interfaceIComponent
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cleanup
public void cleanup()Description copied from interface:IBolt
Called when an IBolt is going to be shutdown. Storm will make a best-effort attempt to call this if the worker shutdown is orderly. TheConfig.SUPERVISOR_WORKER_SHUTDOWN_SLEEP_SECS
setting controls how long orderly shutdown is allowed to take. There is no guarantee that cleanup will be called if shutdown is not orderly, or if the shutdown exceeds the time limit.The one context where cleanup is guaranteed to be called is when a topology is killed when running Storm in local mode.
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