Package com.tangosol.io

Interface DeltaCompressor

All Known Implementing Classes:
BinaryDeltaCompressor, DecoratedBinaryDeltaCompressor, DecorationOnlyDeltaCompressor, ExternalizableHelper.FormatAwareCompressor, NullImplementation.NullDeltaCompressor, PofDeltaCompressor
public interface DeltaCompressor
The DeltaCompressor interface provides the capability of comparing two in-memory buffers containing an old and a new value, and producing a result (called a "delta") that can be applied to the old value to create the new value.
Author:
cp 2009.01.06

  • Method Summary

    Modifier and Type
    Method
    Description
    ReadBuffer
    applyDelta(ReadBuffer bufOld, ReadBuffer bufDelta)
    Apply a delta to an old value in order to create a new value.
    ReadBuffer
    extractDelta(ReadBuffer bufOld, ReadBuffer bufNew)
    Compare an old value to a new value and generate a delta that represents the changes that must be made to the old value in order to transform it into the new value.

  • Method Details

    • extractDelta

      ReadBuffer extractDelta(ReadBuffer bufOld, ReadBuffer bufNew)
      Compare an old value to a new value and generate a delta that represents the changes that must be made to the old value in order to transform it into the new value. The generated delta must be a ReadBuffer of non-zero length.

      If the old value is null, the generated delta must be a "replace", meaning that applying it to any value must produce the specified new value.

      Parameters:
      bufOld - the old value
      bufNew - the new value; must not be null
      Returns:
      the changes that must be made to the old value in order to transform it into the new value, or null to indicate no change

    • applyDelta

      ReadBuffer applyDelta(ReadBuffer bufOld, ReadBuffer bufDelta)
      Apply a delta to an old value in order to create a new value.
      Parameters:
      bufOld - the old value
      bufDelta - the delta information returned from extractDelta(com.tangosol.io.ReadBuffer, com.tangosol.io.ReadBuffer) to apply to the old value
      Returns:
      the new value