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java.lang.Object backtype.storm.topology.base.BaseComponent backtype.storm.topology.base.BaseRichBolt backtype.storm.testing.TestGlobalCount
public class TestGlobalCount
Field Summary | |
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static Logger |
LOG
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Constructor Summary | |
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TestGlobalCount()
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Method Summary | |
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void |
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 |
execute(Tuple input)
Process a single tuple of input. |
Fields |
getOutputFields()
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void |
prepare(java.util.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 backtype.storm.topology.base.BaseComponent |
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getComponentConfiguration |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface backtype.storm.topology.IComponent |
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getComponentConfiguration |
Field Detail |
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public static Logger LOG
Constructor Detail |
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public TestGlobalCount()
Method Detail |
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public void prepare(java.util.Map stormConf, TopologyContext context, OutputCollector collector)
IBolt
This includes the:
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.public void execute(Tuple input)
IBolt
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.
input
- The input tuple to be processed.public void cleanup()
IBolt
The one context where cleanup is guaranteed to be called is when a topology is killed when running Storm in local mode.
cleanup
in interface IBolt
cleanup
in class BaseRichBolt
public Fields getOutputFields()
public void declareOutputFields(OutputFieldsDeclarer declarer)
IComponent
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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