Package org.apache.storm.starter

# Class RollingTopWords

java.lang.Object
org.apache.storm.topology.ConfigurableTopology
org.apache.storm.starter.RollingTopWords

public class RollingTopWords extends ConfigurableTopology
This topology does a continuous computation of the top N words that the topology has seen in terms of cardinality. The top N computation is done in a completely scalable way, and a similar approach could be used to compute things like trending topics or trending images on Twitter.

- ## Field Summary

  ### Fields inherited from class org.apache.storm.topology.ConfigurableTopology

  `conf`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static void`
  `main(String[] args)`
  `protected int`
  `run(String[] args)`
  Submits (runs) the topology.

  ### Methods inherited from class org.apache.storm.topology.ConfigurableTopology

  `getConf, loadConf, start, submit, submit`

  ### Methods inherited from class java.lang.Object

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

- ## Method Details

  - ### main

    public static void main(String[] args) throws Exception
    Throws:
      `Exception`

  - ### run

    protected int run(String[] args)
    Submits (runs) the topology.

    Usage: "RollingTopWords [topology-name] [-local]"

    By default, the topology is run locally under the name "slidingWindowCounts".

    Examples: ``` # Runs in remote/cluster mode, with topology name "production-topology" $ storm jar storm-starter-jar-with-dependencies.jar org.apache.storm.starter.RollingTopWords production-topology ```

    Specified by:
      `run` in class `ConfigurableTopology`
    Parameters:
      `args` - First positional argument (optional) is topology name, second positional argument (optional) defines whether to run the topology locally ("-local") or remotely, i.e. on a real cluster.