コンストラクタの詳細

• RrdNioByteBufferBackend

  protected RrdNioByteBufferBackend​(java.lang.String path,
                                    boolean readOnly)
                             throws java.io.IOException,
                                    java.lang.IllegalStateException

  Creates RrdFileBackend object for the given file path, backed by java.nio.* classes.

  パラメータ:

  path - Path to a file

  readOnly - True, if file should be open in a read-only mode. False otherwise

  例外:

  java.io.IOException - Thrown in case of I/O error

  java.lang.IllegalStateException

メソッドの詳細

• setLength

  protected void setLength​(long newLength)
                    throws java.io.IOException

  Sets length of the underlying RRD file. This method is called only once, immediately after a new RRD file gets created.

  オーバーライド:

  setLength クラス内 RrdFileBackend

  パラメータ:

  newLength - Length of the RRD file

  例外:

  java.io.IOException - Thrown in case of I/O error.

• write

  protected void write​(long offset,
                       byte[] b)

  Writes bytes to the underlying RRD file on the disk

  オーバーライド:

  write クラス内 RrdFileBackend

  パラメータ:

  offset - Starting file offset

  b - Bytes to be written.

• read

  protected void read​(long offset,
                      byte[] b)

  Reads a number of bytes from the RRD file on the disk

  オーバーライド:

  read クラス内 RrdFileBackend

  パラメータ:

  offset - Starting file offset

  b - Buffer which receives bytes read from the file.

• close

  public void close​()
             throws java.io.IOException

  Closes the underlying RRD file.

  オーバーライド:

  close クラス内 RrdFileBackend

  例外:

  java.io.IOException - Thrown in case of I/O error