Common Software Architectural Patterns - Sanjeev435/MyJavaPractiseSets GitHub Wiki
- Layered pattern
- Client-server pattern
- Master-slave pattern
- Pipe-filter pattern
- Broker pattern
- Peer-to-peer pattern
- Event-bus pattern
- Model-view-controller pattern
- Blackboard pattern
- Interpreter pattern
- This pattern can be used to structure programs that can be decomposed into groups of subtasks, each of which is at a particular level of abstraction.
- Each layer provides services to the next higher layer.
The most commonly found 4 layers of a general information system are as follows.
- Presentation layer (also known as UI layer)
- Application layer (also known as service layer)
- Business logic layer (also known as domain layer)
- Data access layer (also known as persistence layer)
General Usage
- General desktop applications.
- E-commerce web applications.
- This pattern consists of two parties - a server and multiple clients.
- The server component will provide services to multiple client components.
- Clients request services from the server and the server provides relevant services to those clients. Furthermore, the server continues to listen to client requests.
General Usage
- Online applications such as email, document sharing and banking.
- This pattern consists of two parties : master and slaves.
- The master component distributes the work among identical slave components, and computes a final result from the results which the slaves return.
General Usage
- In database replication, the master database is regarded as the authoritative source, and the slave databases are synchronized to it.
- Peripherals connected to a bus in a computer system (master and slave drives).
- This pattern can be used to structure systems which produce and process a stream of data. Each processing step is enclosed within a filter component. * * Data to be processed is passed through pipes. These pipes can be used for buffering or for synchronization purposes.
General Usage
- Compilers. The consecutive filters perform lexical analysis, parsing, semantic analysis, and code generation.
- Workflows in bioinformatics.
- This pattern is used to structure distributed systems with decoupled components.
- These components can interact with each other by remote service invocations.
- A broker component is responsible for the coordination of communication among components.
- Servers publish their capabilities (services and characteristics) to a broker. Clients request a service from the broker, and the broker then redirects the client to a suitable service from its registry.
General Usage
- Message broker software such as Apache ActiveMQ, Apache Kafka, RabbitMQ and JBoss Messaging.
- In this pattern, individual components are known as peers.
- Peers may function both as a client, requesting services from other peers, and as a server, providing services to other peers.
- A peer may act as a client or as a server or as both, and it can change its role dynamically with time.
General Usage
- File-sharing networks such as Gnutella and G2)
- Multimedia protocols such as P2PTV and PDTP.
- Cryptocurrency-based products such as Bitcoin and Blockchain
- This pattern primarily deals with events and has 4 major components : event source, event listener, channel and event bus.
- Sources publish messages to particular channels on an event bus. Listeners subscribe to particular channels. Listeners are notified of messages that are published to a channel to which they have subscribed before.
General Usage
- Android development
- Notification services
- This pattern, also known as MVC pattern, divides an interactive application in to 3 parts as,
model : contains the core functionality and data
view : displays the information to the user (more than one view may be defined)
controller : handles the input from the user. - This is done to separate internal representations of information from the ways information is presented to, and accepted from, the user.
- It decouples components and allows efficient code reuse.
General Usage
- Architecture for World Wide Web applications in major programming languages.
- Web frameworks such as Django and Rails.
- This pattern is useful for problems for which no deterministic solution strategies are known.
- The blackboard pattern consists of 3 main components.
blackboard : a structured global memory containing objects from the solution space
knowledge source : specialized modules with their own representation
control component : selects, configures and executes modules. - All the components have access to the blackboard. Components may produce new data objects that are added to the blackboard.
- Components look for particular kinds of data on the blackboard, and may find these by pattern matching with the existing knowledge source.
General Usage
- Speech recognition
- Vehicle identification and tracking
- Protein structure identification
- Sonar signals interpretation.
- This pattern is used for designing a component that interprets programs written in a dedicated language.
- It mainly specifies how to evaluate lines of programs, known as sentences or expressions written in a particular language.
- The basic idea is to have a class for each symbol of the language.
General Usage
- Database query languages such as SQL.
- Languages used to describe communication protocols.
