private static void acquireReadLock(Map<File, RandomAccessFile> lockFileMap, File indexDir)
throws IOException, LockAquisitionException {
final File writeLock = new File(indexDir, "delete.lock");
writeLock.createNewFile();
while (true) {
synchronized (lockFileMap) {
RandomAccessFile raf = lockFileMap.get(indexDir);
if (raf == null) {
raf = new RandomAccessFile(writeLock, "r");
lockFileMap.put(indexDir, raf);
} else {
throw new AlreadyOpenException();
}
final FileChannel channel = raf.getChannel();
try {
channel.lock(0, Long.MAX_VALUE, true);
if (indexDir.exists()) {
return;
}
lockFileMap.remove(indexDir);
Closeables2.closeQuietly(raf, log);
throw new ShardDeletedException();
} catch (OverlappingFileLockException e) {
lockFileMap.remove(indexDir);
Closeables2.closeQuietly(raf, log);
throw Throwables.propagate(e);
} catch (FileLockInterruptionException e) {
lockFileMap.remove(indexDir);
Closeables2.closeQuietly(raf, log);
}
}
}
}
@Override
public void close() throws IOException {
synchronized (lockFileMap) {
final RandomAccessFile randomAccessFile = lockFileMap.get(indexDir);
Closeables2.closeQuietly(randomAccessFile, log);
lockFileMap.remove(indexDir);
}
}