uk.ac.starlink.ttools.plot2.data
Interface DataStoreFactory

All Known Implementing Classes:

CachedDataStoreFactory, SimpleDataStoreFactory, WrapperDataStoreFactory

public interface DataStoreFactory

Provides a data-bearing object capable of providing the actual data for a number of data specifications.

Since:

11 Feb 2013

Author:

Mark Taylor

Method Summary

DataStore

readDataStore(DataSpec[] specs, DataStore prevStore) Generates a DataStore capable of supplying the data for a given list of DataSpec objects.

Method Detail

readDataStore

@Slow
DataStore readDataStore(DataSpec[] specs,
                             DataStore prevStore)
                        throws IOException,
                               InterruptedException

Generates a DataStore capable of supplying the data for a given list of DataSpec objects. The prevStore argument may optionally supply the result of a previous invocation of this method. The implementation may choose to make use of the internal state of such an instance for efficiency, for instance by re-using data that has already been read.

Since the bulk data is managed by the DataStore object, care should be taken about what happens to the DataStore objects supplied to and returned from this method. In particular, code both invoking and implementing this method should usually make sure not to keep a reference to the prevStore argument.

This method may perform the actual reading, and therefore take time. It is not intended to be invoked on the event dispatch thread.

Parameters:

specs - data specifications; some elements may be null

prevStore - previously obtained DataStore, or null

Returns:

new data store

Throws:

IOException

InterruptedException