/**
* Closes the writer to be sure that all changes are in the directory and then calls the shell
* command that makes a copy of it. Used to make a copy of the directory while it's in a
* consistent state. If there is an index optimization scheduled, it'll be performed here.
*
* @throws IllegasStateException if the index copy couldn't be made.
* @throws RuntimeException if there was a problem opening the index.
*/
public synchronized void makeDirectoryCheckpoint() {
workIndex.flush();
}
/**
* Opens the writer.
*
* @throws RuntTimeException if there was a problem opening the writer.
*/
private void openWriter() {
writer = workIndex.getLuceneIndexWriter();
}