public FileIDMigrator(File dataFile, long minReloadIntervalMS) {
longToString = new FastByIDMap<String>(100);
this.dataFile = Preconditions.checkNotNull(dataFile);
if (!dataFile.exists() || dataFile.isDirectory()) {
throw new FileNotFoundException(dataFile.toString());
}
log.info("Creating FileReadonlyIDMigrator for file {}", dataFile);
this.reloadLock = new ReentrantLock();
this.lastModified = dataFile.lastModified();
this.minReloadIntervalMS = minReloadIntervalMS;
reload();
}