Session State Patterns
For standard enterprise application, session could be stored in:
Client Session State
it is commonly stored as Cookies in browsers.
Server Session State
it is commonly stored in a clustered cache such as ones provided by JBoss, WebSphere application servers.
Database Session State
It is a database or other data store. For big data solutions, optimized data stores such as Cassandra could be used to handle the high throughput and data volume that traditional databases may not be able to perform well.
Domain Logic Patterns
Transaction Script
Many financial applications may still use stored procedures that put business logic very close to data.
Some simple application may just put all business logic in scripts
Table Module
Some popular frameworks expose an UI that users may hook up tables easily. This kind of mechanisms usually are back up by Table Module that is a single instance that handles the business logic for all rows in a database table.
Domain Model and Service Layer
More complicated applications usually require to start with a domain model first, then a service layer is used to control the abstracted functions that are exposed as services.
Data Source Architectural Patterns
Table Data Gateway
encapsulate the data in a table and its queries in an object, then expose it as a POJO
Row Data Gateway
expose the data in a POJO without any query concerns
Active Record
Incorporate business logic into data access object
Data Mapper
In ORM frameworks, the mapping meta data between objects and tables are stored in separate XML files or annotations. The data is mapped to Entity and Value Object, and many times organized in an aggregate.
Object-Relational Metadata Mapping Patterns
Metadata Mapping
XML files or annotations
Query Object
Object oriented query language that is a wrapper over SQL
Repository
Manages data retrieving functions in a framework core component, in Hibernate/JPA, it is the EntityManager.
