Levelizing.pdf

Getting Started with JPA 2.0 and Patterns of Modular Architecture.

The JPA 2.0 section is a brief introduction to a refcard that covers various aspects of JPA 2.0, including what's new, JDBC properties, access mode, mappings, shared cache, and additional API.

The Patterns of Modular Architecture section provides an overview of modular design patterns, which help developers create more modular, extensible, and maintainable software systems. It covers base patterns, dependency patterns, usability patterns, extensibility patterns, and utility patterns. The base patterns include managing relationships, module reuse, and cohesive modules. The dependency patterns focus on managing relationships between modules, including acyclic relationships.

Key points from the text include:
- Modularity patterns help design more modular software systems.
- Logical design focuses on methods, relationships, and package structure, while modular design focuses on physical entities and relationships.
- The two facets of modularity are the runtime model and the development model.
- A software module is a deployable, manageable, reusable, composable, and stateless unit of software.
- Base patterns establish the thought process for designing modular systems, focusing on modules as the unit of reuse, dependency management, and cohesion.
- Dependency patterns manage relationships between modules, increasing the likelihood of module reuse.
- Acyclic relationships are essential to avoid complicating the module structure.