# Package org.apache.storm

- Interface Summary
  Interface | Description
  --- | ---
  ICredentialsListener | Allows a bolt or a spout to be informed when the credentials of the topology have changed.
  ILocalCluster | This is here mostly for backwards compatibility.
  ILocalCluster.ILocalTopology | Close this class to kill the topology.
  ILocalClusterTrackedTopologyAware | This is here mostly for backwards compatibility.
  ILocalDRPC |
  ISubmitterHook | if FQCN of an implementation of this class is specified by setting the config storm.topology.submission.notifier.plugin.class, that class’s notify method will be invoked when a topology is successfully submitted via StormSubmitter class.
  StormSubmitter.ProgressListener | Interface use to track progress of file upload.
  Testing.Condition | Simply produces a boolean to see if a specific state is true or false.

- Class Summary
  Class | Description
  --- | ---
  Config | Topology configs are specified as a plain old map.
  Constants |
  DaemonConfig | Storm configs are specified as a plain old map.
  ExclamationTopology | This is a basic example of a Storm topology.
  ExclamationTopology.ExclamationBolt |
  ExclamationTopology.FixedOrderWordSpout |
  LocalCluster | A stand alone storm cluster that runs inside a single process.
  LocalCluster.Builder | Simple way to configure a LocalCluster to meet your needs.
  LocalDRPC | A Local way to test DRPC.
  LogWriter | Launch a sub process and write files out to logs.
  ProcessSimulator | In local mode, `ProcessSimulator` keeps track of Shutdownable objects in place of actual processes (in cluster mode).
  ServerConstants |
  StormSubmitter | Use this class to submit topologies to run on the Storm cluster.
  StormTimer | The timer defined in this file is very similar to java.util.Timer, except it integrates with Storm’s time simulation capabilities.
  StormTimer.QueueEntry |
  StormTimer.StormTimerTask |
  Testing | A utility that helps with testing topologies, Bolts and Spouts.
  Testing.CapturedTopology<T> | A topology that has all messages captured and can be read later on.
  Thrift |
  Thrift.BoltDetails |
  Thrift.SpoutDetails |

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