Ejemplo n.º 1
0
  void _pickInitial() throws MongoException {
    if (_curAddress != null) return;

    // we need to just get a server to query for ismaster
    _pickCurrent();

    try {
      _logger.info("current address beginning of _pickInitial: " + _curAddress);

      DBObject im = isMasterCmd();
      if (_isMaster(im)) return;

      synchronized (_allHosts) {
        Collections.shuffle(_allHosts);
        for (ServerAddress a : _allHosts) {
          if (_curAddress == a) continue;

          _logger.info("remote [" + _curAddress + "] -> [" + a + "]");
          _set(a);

          im = isMasterCmd();
          if (_isMaster(im)) return;

          _logger.severe("switched to: " + a + " but isn't master");
        }

        throw new MongoException("can't find master");
      }
    } catch (Exception e) {
      _logger.log(Level.SEVERE, "can't pick initial master, using random one", e);
    }
  }
Ejemplo n.º 2
0
  public DBTCPConnector(Mongo m, ServerAddress addr) throws MongoException {
    _mongo = m;
    _portHolder = new DBPortPool.Holder(m._options);
    _checkAddress(addr);

    _createLogger.info(addr.toString());

    if (addr.isPaired()) {
      _allHosts = new ArrayList<ServerAddress>(addr.explode());
      _createLogger.info("switch to paired mode : " + _allHosts + " -> " + _curAddress);
    } else {
      _set(addr);
      _allHosts = null;
    }
  }
Ejemplo n.º 3
0
  public DBTCPConnector(Mongo m, List<ServerAddress> all) throws MongoException {
    _mongo = m;
    _portHolder = new DBPortPool.Holder(m._options);
    _checkAddress(all);

    _allHosts = new ArrayList<ServerAddress>(all); // make a copy so it can't be modified

    _createLogger.info(all + " -> " + _curAddress);
  }
Ejemplo n.º 4
0
  /**
   * Creates and initializes an SPV block store. Will create the given file if it's missing. This
   * operation will block on disk.
   */
  public SPVBlockStore(NetworkParameters params, File file) throws BlockStoreException {
    checkNotNull(file);
    this.params = checkNotNull(params);
    try {
      this.numHeaders = DEFAULT_NUM_HEADERS;
      boolean exists = file.exists();
      // Set up the backing file.
      randomAccessFile = new RandomAccessFile(file, "rw");
      long fileSize = getFileSize();
      if (!exists) {
        log.info("Creating new SPV block chain file " + file);
        randomAccessFile.setLength(fileSize);
      } else if (randomAccessFile.length() != fileSize) {
        throw new BlockStoreException(
            "File size on disk does not match expected size: "
                + randomAccessFile.length()
                + " vs "
                + fileSize);
      }

      FileChannel channel = randomAccessFile.getChannel();
      fileLock = channel.tryLock();
      if (fileLock == null)
        throw new BlockStoreException("Store file is already locked by another process");

      // Map it into memory read/write. The kernel will take care of flushing writes to disk at the
      // most
      // efficient times, which may mean that until the map is deallocated the data on disk is
      // randomly
      // inconsistent. However the only process accessing it is us, via this mapping, so our own
      // view will
      // always be correct. Once we establish the mmap the underlying file and channel can go away.
      // Note that
      // the details of mmapping vary between platforms.
      buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, fileSize);

      // Check or initialize the header bytes to ensure we don't try to open some random file.
      byte[] header;
      if (exists) {
        header = new byte[4];
        buffer.get(header);
        if (!new String(header, "US-ASCII").equals(HEADER_MAGIC))
          throw new BlockStoreException("Header bytes do not equal " + HEADER_MAGIC);
      } else {
        initNewStore(params);
      }
    } catch (Exception e) {
      try {
        if (randomAccessFile != null) randomAccessFile.close();
      } catch (IOException e2) {
        throw new BlockStoreException(e2);
      }
      throw new BlockStoreException(e);
    }
  }
Ejemplo n.º 5
0
 @Override
 public void close() throws BlockStoreException {
   try {
     buffer.force();
     if (System.getProperty("os.name").toLowerCase().contains("win")) {
       log.info("Windows mmap hack: Forcing buffer cleaning");
       WindowsMMapHack.forceRelease(buffer);
     }
     buffer = null; // Allow it to be GCd and the underlying file mapping to go away.
     randomAccessFile.close();
   } catch (IOException e) {
     throw new BlockStoreException(e);
   }
 }
Ejemplo n.º 6
0
  private void _pickCurrent() throws MongoException {
    if (_allHosts == null)
      throw new MongoException(
          "got master/slave issue but not in master/slave mode on the client side");

    synchronized (_allHosts) {
      Collections.shuffle(_allHosts);
      for (int i = 0; i < _allHosts.size(); i++) {
        ServerAddress a = _allHosts.get(i);
        if (a == _curAddress) continue;

        if (_curAddress != null) {
          _logger.info("switching from [" + _curAddress + "] to [" + a + "]");
        }

        _set(a);
        return;
      }
    }

    throw new MongoException("couldn't find a new host to swtich too");
  }