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

Package org.eclipse.jgit.internal.storage.file

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

org.eclipse.jgit.internal.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 detachHead() throws IOException {
    final String head = db.getFullBranch();
    final ObjectId id = db.resolve(Constants.HEAD);
    if (!ObjectId.isId(head) && id != null) {
      final LockFile lf;
      lf = new LockFile(new File(db.getDirectory(), Constants.HEAD), db.getFS());
      if (!lf.lock())
        throw new IOException(MessageFormat.format(CLIText.get().cannotLock, Constants.HEAD));
      lf.write(id);
      if (!lf.commit())
        throw new IOException(CLIText.get().cannotDeatchHEAD);
    }
  }

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    new RefWriter(refs.values()) {
      @Override
      protected void writeFile(final String name, final byte[] content)
          throws IOException {
        final File file = new File(db.getDirectory(), name);
        final LockFile lck = new LockFile(file, db.getFS());
        if (!lck.lock())
          throw new ObjectWritingException(MessageFormat.format(CLIText.get().cantWrite, file));
        try {
          lck.write(content);
        } catch (IOException ioe) {
          throw new ObjectWritingException(MessageFormat.format(CLIText.get().cantWrite, file));
        }
        if (!lck.commit())
          throw new ObjectWritingException(MessageFormat.format(CLIText.get().cantWrite, file));
      }
    }.writePackedRefs();
  }

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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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  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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    return new File(packdir, "pack-" + name.name() + t);
  }


  private void writeFile(final File p, final byte[] bin) throws IOException,
      ObjectWritingException {
    final LockFile lck = new LockFile(p, db.getFS());
    if (!lck.lock())
      throw new ObjectWritingException("Can't write " + p);
    try {
      lck.write(bin);
    } catch (IOException ioe) {
      throw new ObjectWritingException("Can't write " + p);
    }
    if (!lck.commit())
      throw new ObjectWritingException("Can't write " + p);
  }

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      out = bos.toByteArray();
    } else {
      out = Constants.encode(text);
    }


    final LockFile lf = new LockFile(getFile(), fs);
    if (!lf.lock())
      throw new LockFailedException(getFile());
    try {
      lf.setNeedSnapshot(true);
      lf.write(out);
      if (!lf.commit())
        throw new IOException(MessageFormat.format(JGitText.get().cannotCommitWriteTo, getFile()));
    } finally {
      lf.unlock();
    }
    snapshot = lf.getCommitSnapshot();
    hash = hash(out);
    // notify the listeners
    fireConfigChangedEvent();
  }

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    assertNotNull(commit1);
    writeTrashFile("file.txt", "content2");
    git.add().addFilepattern("file.txt").call();
    assertNotNull(git.commit().setMessage("edit file").call());


    LockFile lf = new LockFile(db.getIndexFile(), db.getFS());
    assertTrue(lf.lock());
    try {
      git.checkout().setName(commit1.name()).call();
      fail("JGitInternalException not thrown");
    } catch (JGitInternalException e) {
      assertTrue(e.getCause() instanceof LockFailedException);
      lf.unlock();
      git.checkout().setName(commit1.name()).call();
    }
  }

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