Class RrdSafeFileBackend

All Implemented Interfaces:
RrdFileBackend

public class RrdSafeFileBackend
extends RrdRandomAccessFileBackend
Backend which is used to store RRD data to ordinary files on the disk, using locking. This backend is SAFE: it locks the underlying RRD file during update/fetch operations, and caches only static parts of a RRD file in memory. Therefore, this backend is safe to be used when RRD files should be shared between several JVMs at the same time. However, this backend is a little bit slow since it does not use fast java.nio.* package (it's still based on the RandomAccessFile class).
  • Constructor Details

    • RrdSafeFileBackend

      public RrdSafeFileBackend​(String path, long lockWaitTime, long lockRetryPeriod) throws IOException
      Creates RrdFileBackend object for the given file path, backed by RandomAccessFile object.
      Parameters:
      path - Path to a file
      lockWaitTime - lock waiting time in milliseconds.
      lockRetryPeriod - lock retry period in milliseconds.
      Throws:
      IOException - Thrown in case of I/O error.
  • Method Details