ostore.oil
Class HMMPredictor

java.lang.Object
  |
  +--ostore.oil.HMMStage
        |
        +--ostore.oil.HMMPredictor

All Implemented Interfaces:

EventHandlerIF

public class HMMPredictor

extends HMMStage

A stage which uses a Hidden Markov Model to predict the future of a monitored event stream. This class extends HMMStage, adding support for Predictor-specific config tags and ipmlementing the handleEvent method.

Version:

$Id: HMMPredictor.java,v 1.9 2002/07/22 20:54:53 srhea Exp $

Author:

Dennis Geels

See Also:

HMM

Nested Class Summary

Nested classes inherited from class ostore.oil.HMMStage

HMMStage.InvalidTypeException, HMMStage.UnsupportedConfigurationException

Field Summary

protected int	history_size The number of past events to consider when making predictions.
protected int	num_observed The total number of observations so far.
protected int	prediction_horizon The number of observations to look into the future
protected int	prediction_period The number of events to observe before producing and emitting a new Prediction.

Fields inherited from class ostore.oil.HMMStage

accessor, class_tag, classifier, model, name, observed_type, QueueElementIF_class, QuickSerializable_class

Constructor Summary

HMMPredictor()

Method Summary

void	handleEvent(QueueElementIF elem) Processes the monitored event stream.
void	init(ConfigDataIF config) Initializes this HMMPredictor using the configuration parameters.

Methods inherited from class ostore.oil.HMMStage

destroy, handleEvents

Methods inherited from class java.lang.Object

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

Field Detail

prediction_period

protected int prediction_period

The number of events to observe before producing and emitting a new Prediction.

prediction_horizon

protected int prediction_horizon

The number of observations to look into the future

See Also:

HMM.predict(int)

history_size

protected int history_size

The number of past events to consider when making predictions. Effectively the amount of history to retain between predictions.

num_observed

protected int num_observed

The total number of observations so far.

Constructor Detail

HMMPredictor

public HMMPredictor()

Method Detail

handleEvent

public void handleEvent(QueueElementIF elem)
                 throws UnknownEventException

Processes the monitored event stream.

Throws:

UnknownEventException - if elem is not of the expected event types.

init

public void init(ConfigDataIF config)
          throws Exception

Initializes this HMMPredictor using the configuration parameters.

Specified by:

init in interface EventHandlerIF

Overrides:

init in class HMMStage

Throws:

InvalidConfigFileException - if the ConfigDataIF contains an invalid parameter or does not contain a required field.

InvalidTypeException - if a parameter specifies a Class or Field which does not implement the proper java interface.

Exception

See Also:

HMMStage.init(seda.sandStorm.api.ConfigDataIF)