Examples of org.eclipse.jgit.storage.file.LockFile

org.eclipse.jgit.storage.file.LockFile
Git style file locking and replacement.
To modify a ref file Git tries to use an atomic update approach: we write the new data into a brand new file, then rename it in place over the old name. This way we can just delete the temporary file if anything goes wrong, and nothing has been damaged. To coordinate access from multiple processes at once Git tries to atomically create the new temporary file under a well-known name.


  private void updateFETCH_HEAD(final FetchResult result) throws IOException {
    File meta = transport.local.getDirectory();
    if (meta == null)
      return;
    final LockFile lock = new LockFile(new File(meta, "FETCH_HEAD"), //$NON-NLS-1$
        transport.local.getFS());
    try {
      if (lock.lock()) {
        final Writer w = new OutputStreamWriter(lock.getOutputStream());
        try {
          for (final FetchHeadRecord h : fetchHeadUpdates) {
            h.write(w);
            result.add(h);
          }
        } finally {
          w.close();
        }
        lock.commit();
      }
    } finally {
      lock.unlock();
    }
  }

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