Design patterns are the solution of well known industry problem, design patterns can also be formalized as best practices a programmer or a developer should follow. Its a way of effectively arranging objects in memory for greater reuse.
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Gang of four Patterns:
- Creational patterns
- Structural patterns
- Behavioral pattern
- Concurrency patterns
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J2EE Patterns Patterns in a multi-tiered application, a tier is a logical separation of responsibility. Each tier is given a unique responsibility in a software system, and in ideal world there is no dependency or minimal dependency between each layer.
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Client Tier Application client, browser
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Presentation tier This tier contains all the presentation logic JSP, Servlets, etc
- Intercepting filter
- Front controller
- Context objects
- Application controller
- View Helper
- Composite View
- Service to worker
- Dispatcher View
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Business tier This tier provides business service required by the application clients EJB, Webservices
- Business delegate
- Service Locator
- Session Facade
- Application Service
- Business Object
- Composite Entity
- Transfer Object
- Transfer Object Assembler
- Value List Handler
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Integration tier This tier is responsible for communicating with external resources JMS, JDBC
- Data Access Object (DAO)
- Service Activator
- Domain Store
- Web Service Broker
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Resource tier Database, filesystem
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React
Typescript
Django
Laravel
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Google
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D3
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