White Papers

The Jade 2025 product information library now contains the Collection Concurrency white paper in addition to a new Part 5 ("Transaction Agent Framework") in the Erewhon Demonstration Reference. For an overview, see the:

• Collection Concurrency White Paper , which covers the use of deferred operations to help minimize lock contention on persistent collections in multiuser systems.

• Erewhon Demonstration System Reference , "Part 5 - Transaction Agent Framework", which discusses persisting objects using the Jade Platform and it provides examples of a Transaction Agent Framework (TAF) that you can use in your own applications.

  Software requirements are constantly changing, so new methods and properties may need to be introduced at any stage of development. What the client initially requested is often different from their actual needs. Due to the high possibility of change, software should be written in a way that is open for extension and closed for modification. Simply put, we don't want to delete existing working code in order to develop additional requirements; instead we want to extend the code base with the new logic. This is referred to as the Open/Closed Principle.

  The Transaction Agent Framework does not use parameterized functions or constructors to create objects, because adding additional parameters when requirements change is likely to cause changes that break existing code. Instead, the TAF creates objects based on the properties stored in the transaction agent class. This method of creating objects not only eliminates parameterized functions and constructors but allows additional properties and logic to be added into the code base without affecting the original code.