prajna.structure.stream

Interface StreamingAccessor<N,E>

Type Parameters:

N - The node class, used in grids, datasets, trees, and the nodes of graphs

E - the edge class for graphs

All Superinterfaces:

DataAccessor<N,E>

All Known Implementing Classes:

StreamSemanticAccessor

public interface StreamingAccessor<N,E>
extends DataAccessor<N,E>

Interface for a DataAccessor which accepts streaming data. This interface adds support for a DataStructureListener. It also supports setting an aging time to determine when a particular data element should be aged off. The listeners should be called when adding, removing or changing a data element results in a change to the data structure associated with that DataStructureListener.

Author:

Edward Swing

Method Summary

Methods

Modifier and Type	Method and Description
void	addDataStructureListener(DataStructureListener listener) Add a data structure listener to listen for events when a particular data structure changes.
int	getAgingTime() Get the length of time that a particular data element will be retained.
void	setAgingTime(int time) Set the length of time that a particular data element will be retained.

Methods inherited from interface prajna.structure.DataAccessor

extendGraph, extendTree, getDataset, getDatasetNames, getGraph, getGraphNames, getGrid, getGridNames, getStructureType, getTree, getTreeNames, setConfig, setInitParameters

Method Detail

addDataStructureListener

void addDataStructureListener(DataStructureListener listener)

Add a data structure listener to listen for events when a particular data structure changes.

Parameters:

listener - the DataStructureListener

getAgingTime

int getAgingTime()

Get the length of time that a particular data element will be retained. If the value is less than 0, the data elements are not aged. The aging time is specified in seconds.

Returns:

the aging time

setAgingTime

void setAgingTime(int time)

Set the length of time that a particular data element will be retained. If the value is less than 0, the data elements are not aged. The aging time is specified in seconds. The default value is -1.

Parameters:

time - the aging time