Class RrdJRobin14FileBackend


  • public class RrdJRobin14FileBackend
    extends RrdBackend
    JRobin backend which is used to store RRD data to ordinary files on the disk. This was the default factory before 1.4.0 version.

    This backend is based on the RandomAccessFile class (java.io.* package).

    • Constructor Detail

      • RrdJRobin14FileBackend

        protected RrdJRobin14FileBackend​(String path,
                                         boolean readOnly,
                                         RrdJRobin14FileBackend.LockMode lockMode)
                                  throws IOException
        Creates RrdFileBackend object for the given file path, backed by RandomAccessFile object.
        Parameters:
        path - Path to a file
        readOnly - True, if file should be open in a read-only mode. False otherwise
        lockMode - Locking mode: Exception if locked, Wait if locked, or no locks.
        Throws:
        IOException - Thrown in case of I/O error
    • Method Detail

      • getCanonicalPath

        public String getCanonicalPath()
                                throws IOException
        Returns canonical path to the file on the disk.
        Returns:
        Canonical file path
        Throws:
        IOException - Thrown in case of I/O error
      • write

        protected void write​(long offset,
                             byte[] b)
                      throws IOException
        Writes bytes to the underlying RRD file on the disk
        Specified by:
        write in class RrdBackend
        Parameters:
        offset - Starting file offset
        b - Bytes to be written.
        Throws:
        IOException - Thrown in case of I/O error
      • read

        protected void read​(long offset,
                            byte[] b)
                     throws IOException
        Reads a number of bytes from the RRD file on the disk
        Specified by:
        read in class RrdBackend
        Parameters:
        offset - Starting file offset
        b - Buffer which receives bytes read from the file.
        Throws:
        IOException - Thrown in case of I/O error.
      • setLength

        protected void setLength​(long length)
                          throws IOException
        Sets length of the underlying RRD file. This method is called only once, immediately after a new RRD file gets created.
        Specified by:
        setLength in class RrdBackend
        Parameters:
        length - Length of the RRD file
        Throws:
        IOException - Thrown in case of I/O error.