ucar.nc2.ncml
Class DatasetCollectionManager

java.lang.Object
  ucar.nc2.ncml.DatasetCollectionManager

public class DatasetCollectionManager
extends java.lang.Object

Manage a list of Scanners that find Files (actually finds CrawlableDataset). Tracks when they need to be rescanned.

Since:

Aug 10, 2007

Author:

caron

Field Summary

protected static org.slf4j.Logger

logger

Constructor Summary

DatasetCollectionManager(java.lang.String recheckS)

Method Summary

void	addDirectoryScan(Scanner scan)
java.util.Collection<ucar.nc2.ncml.MyCrawlableDataset>	getFiles() Get the current collection of MyCrawlableDataset, since last scan or rescan.
long	getLastScanned() Get the last time scanned
TimeUnit	getRecheck() Get how often to rescan
boolean	rescan() Rescan directories.
void	scan(CancelTask cancelTask) Scan the directory(ies) and create MyCrawlableDataset objects.
boolean	timeToRescan() Compute if rescan is needed.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static org.slf4j.Logger logger

Constructor Detail

DatasetCollectionManager

public DatasetCollectionManager(java.lang.String recheckS)

Method Detail

addDirectoryScan

public void addDirectoryScan(Scanner scan)

scan

public void scan(CancelTask cancelTask)
          throws java.io.IOException

Scan the directory(ies) and create MyCrawlableDataset objects. Get the results from getFiles()

Parameters:

cancelTask - allow user to cancel

Throws:

java.io.IOException - if io error

timeToRescan

public boolean timeToRescan()

Compute if rescan is needed. True if scanList not empty, recheckEvery not null, and recheckEvery time has passed since last scanned.

Returns:

true is rescan time has passed

rescan

public boolean rescan()
               throws java.io.IOException

Rescan directories. Files may be deleted or added. If the MyCrawlableDataset already exists in the current list, leave it in the list. If returns true, get the results from getFiles(), otherwise nothing has changed.

Returns:

true if anything actually changed.

Throws:

java.io.IOException - on I/O error

getRecheck

public TimeUnit getRecheck()

Get how often to rescan

Returns:

time dureation of rescan period, or null if none.

getLastScanned

public long getLastScanned()

Get the last time scanned

Returns:

msecs since 1970

getFiles

public java.util.Collection<ucar.nc2.ncml.MyCrawlableDataset> getFiles()

Get the current collection of MyCrawlableDataset, since last scan or rescan.

Returns:

current list of MyCrawlableDataset