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"),
        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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   *             hold the lock.
   */
  public boolean lock() throws IOException {
    if (liveFile == null)
      throw new IOException(JGitText.get().dirCacheDoesNotHaveABackingFile);
    final LockFile tmp = new LockFile(liveFile, fs);
    if (tmp.lock()) {
      tmp.setNeedStatInformation(true);
      myLock = tmp;
      return true;
    }
    return false;
  }

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   * @throws IOException
   *             the output file could not be created. The caller no longer
   *             holds the lock.
   */
  public void write() throws IOException {
    final LockFile tmp = myLock;
    requireLocked(tmp);
    try {
      writeTo(new SafeBufferedOutputStream(tmp.getOutputStream()));
    } catch (IOException err) {
      tmp.unlock();
      throw err;
    } catch (RuntimeException err) {
      tmp.unlock();
      throw err;
    } catch (Error err) {
      tmp.unlock();
      throw err;
    }
  }

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   *         old data.
   * @throws IllegalStateException
   *             the lock is not held.
   */
  public boolean commit() {
    final LockFile tmp = myLock;
    requireLocked(tmp);
    myLock = null;
    if (!tmp.commit())
      return false;
    snapshot = tmp.getCommitSnapshot();
    if (indexChangedListener != null
        && !Arrays.equals(readIndexChecksum, writeIndexChecksum))
      indexChangedListener.onIndexChanged(new IndexChangedEvent());
    return true;
  }

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   * Unlock this file and abort this change.
   * <p>
   * The temporary file (if created) is deleted before returning.
   */
  public void unlock() {
    final LockFile tmp = myLock;
    if (tmp != null) {
      myLock = null;
      tmp.unlock();
    }
  }

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   *             hold the lock.
   */
  public boolean lock() throws IOException {
    if (liveFile == null)
      throw new IOException(JGitText.get().dirCacheDoesNotHaveABackingFile);
    final LockFile tmp = new LockFile(liveFile, fs);
    if (tmp.lock()) {
      tmp.setNeedStatInformation(true);
      myLock = tmp;
      return true;
    }
    return false;
  }

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   * @throws IOException
   *             the output file could not be created. The caller no longer
   *             holds the lock.
   */
  public void write() throws IOException {
    final LockFile tmp = myLock;
    requireLocked(tmp);
    try {
      writeTo(new BufferedOutputStream(tmp.getOutputStream()));
    } catch (IOException err) {
      tmp.unlock();
      throw err;
    } catch (RuntimeException err) {
      tmp.unlock();
      throw err;
    } catch (Error err) {
      tmp.unlock();
      throw err;
    }
  }

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   *         old data.
   * @throws IllegalStateException
   *             the lock is not held.
   */
  public boolean commit() {
    final LockFile tmp = myLock;
    requireLocked(tmp);
    myLock = null;
    if (!tmp.commit())
      return false;
    snapshot = tmp.getCommitSnapshot();
    return true;
  }

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   * Unlock this file and abort this change.
   * <p>
   * The temporary file (if created) is deleted before returning.
   */
  public void unlock() {
    final LockFile tmp = myLock;
    if (tmp != null) {
      myLock = null;
      tmp.unlock();
    }
  }

View Full Code Here


  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"),
        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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