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.

    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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  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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  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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  public void syncCQs(File file, FS fs, URL base, String username,
      String password) throws IOException, ConfigInvalidException {
    if (!file.getParentFile().exists())
      file.getParentFile().mkdirs();


    LockFile lf = new LockFile(file, fs);
    if (!lf.lock())
      throw new IOException(MessageFormat.format(IpLogText.get().cannotLock, file));
    try {
      FileBasedConfig cfg = new FileBasedConfig(file, fs);
      cfg.load();
      loadFrom(cfg);


      IPZillaQuery ipzilla = new IPZillaQuery(base, username, password);
      Set<CQ> current = ipzilla.getCQs(projects);


      for (CQ cq : sort(current, CQ.COMPARATOR)) {
        String id = Long.toString(cq.getID());


        set(cfg, S_CQ, id, K_DESCRIPTION, cq.getDescription());
        set(cfg, S_CQ, id, K_LICENSE, cq.getLicense());
        set(cfg, S_CQ, id, K_USE, cq.getUse());
        set(cfg, S_CQ, id, K_STATE, cq.getState());
        set(cfg, S_CQ, id, K_COMMENTS, cq.getComments());
      }


      for (CQ cq : cqs) {
        if (!current.contains(cq))
          cfg.unsetSection(S_CQ, Long.toString(cq.getID()));
      }


      lf.write(Constants.encode(cfg.toText()));
      if (!lf.commit())
        throw new IOException(MessageFormat.format(IpLogText.get().cannotWrite, file));
    } finally {
      lf.unlock();
    }
  }

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    log.scan(db, rw.parseCommit(start), version);


    if (output != null) {
      if (!output.getParentFile().exists())
        output.getParentFile().mkdirs();
      LockFile lf = new LockFile(output, db.getFS());
      if (!lf.lock())
        throw die(MessageFormat.format(CLIText.get().cannotLock, output));
      try {
        OutputStream os = lf.getOutputStream();
        try {
          log.writeTo(os);
        } finally {
          os.close();
        }
        if (!lf.commit())
          throw die(MessageFormat.format(CLIText.get().cannotWrite, output));
      } finally {
        lf.unlock();
      }
    } else {
      log.writeTo(System.out);
      System.out.flush();
    }

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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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  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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