34.21. Unresolved Issues

This has been a very brief introduction to the problems and design solutions in a persistence framework and service. Many important issues have been glossed over, including:

  • dematerializing objects

    • Briefly, the mappers must define putObjectToStorage methods. Dematerializing composition hierarchies requires collaboration between multiple mappers and the maintenance of associative tables (if an RDB is used).

  • materialization and dematerialization of collections

  • queries for groups of objects

  • thorough transaction handling

  • error handling when a database operation fails

  • multiuser access and locking strategies

  • security—controlling access to the database

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