/// @param minReloadIntervalMS
/// the minimum interval in milliseconds after which a full reload of the original datafile is done
/// when refresh() is called
/// @see #FileItemSimilarity(File)
public FileItemSimilarity(File dataFile, long minReloadIntervalMS) {
//Preconditions.checkArgument(dataFile != null, "dataFile is null");
//Preconditions.checkArgument(dataFile.exists() && !dataFile.isDirectory(),
// "dataFile is missing or a directory: %s", dataFile);
log.info("Creating FileItemSimilarity for file {}", dataFile);
this.dataFile = dataFile.getAbsoluteFile();
this.lastModified = dataFile.lastModified();
this.minReloadIntervalMS = minReloadIntervalMS;
this.reloadLock = new ReentrantLock();
reload();
}