Package es.bsc.dataclay.dbhandler

Interface DBHandler

  • All Known Implementing Classes:
    SQLHandler, SQLiteHandler
    public interface DBHandler
    This class represents the functions that any handler of the storage of objects must implement.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      boolean close()
      Close the database
      int count()
      Count number of objects in DB
      void delete​(ObjectID objectID)
      Deletes and object from the database.
      boolean exists​(ObjectID objectID)
      Check if object with ID provided exists.
      byte[] get​(ObjectID objectID)
      Get serialized object identified by ObjectID
      boolean isClosed()
      Verify if database is closed.
      void open()
      Open the database.
      void store​(ObjectID objectID, byte[] bytes)
      Store the object.
      void update​(ObjectID objectID, byte[] newbytes)
      Updates an object identified by the ID provided with the new values provided.
      void vacuum()
      Vacuum database.

    • Method Detail

      • store

        void store​(ObjectID objectID,
           byte[] bytes)
        Store the object.
        Parameters:
        objectID - ID of the object
        bytes - Bytes of the object

      • get

        byte[] get​(ObjectID objectID)
        Get serialized object identified by ObjectID
        Parameters:
        objectID - ID of the object
        Returns:
        Bytes of the serialized object with ID provided.

      • exists

        boolean exists​(ObjectID objectID)
        Check if object with ID provided exists.
        Parameters:
        objectID - ID of the object
        Returns:
        TRUE if object exists.

      • update

        void update​(ObjectID objectID,
            byte[] newbytes)
        Updates an object identified by the ID provided with the new values provided.
        Parameters:
        objectID - ID of the object.
        newbytes - New byte values

      • delete

        void delete​(ObjectID objectID)
        Deletes and object from the database.
        Parameters:
        objectID - ID of the object to delete

      • isClosed

        boolean isClosed()
        Verify if database is closed.
        Returns:
        TRUE if database is closed. FALSE, otherwise.

      • close

        boolean close()
        Close the database
        Returns:
        TRUE if database was closed successfully. FALSE otherwise.

      • open

        void open()
        Open the database.

      • count

        int count()
        Count number of objects in DB
        Returns:
        number of objects in DB

      • vacuum

        void vacuum()
        Vacuum database.