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This article introduces the relevant knowledge of "what are the common software architecture patterns". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Want to know how to design a large enterprise system? Before starting major code development, we must choose an appropriate architecture that will provide us with the required functionality and quality attributes. Therefore, you should understand the different architectures before applying them to our design.

What is an architectural pattern?

According to Wikipedia,

Architecture pattern is a universal and reusable solution to common problems in software architecture in a given context. Architectural patterns are similar to software design patterns, but are broader in scope.

In this article, I will briefly introduce the following 10 common architectural patterns, as well as their uses, strengths and weaknesses. Hierarchical mode

This pattern can be used to build programs that can be broken down into subtask groups, each at a specific level of abstraction. Provide services to higher levels each time.

The most common four layers in general information systems are as follows:

Presentation layer presentation layer (that is, UI layer)

Application layer application layer (i.e. service layer)

Business logic layer business logic layer (that is, domain layer)

Data access layer data access layer (that is, data persistence layer)

Application

General desktop applications

E-commerce Web application

Pipeline filter mode

This pattern can be used to build systems that generate and process data streams. Each processing step is contained in a filter component, and the data to be processed is passed through the pipeline. These pipes can be used for buffering or synchronization.

Application

Compiler. Use different filters in turn to perform lexical analysis, parsing, parsing, and code generation

Work flow in Bioinformatics

Broker mode

This pattern is to build a distributed system using decoupled components that can interact through remote service invocations. The agent component is responsible for coordinating communication between components.

The server publishes their functions (services, features, etc.) to the agent, and the client requests the service from the agent, and then the agent forwards the client request to the appropriate service according to its registry.

Application

Message broker software, such as Apache ActiveMQ, Apache Kafka, RabbitMQ and JBoss Messaging.

Thing bus mode

This pattern mainly deals with components and has four important components: event source, event listener, channel, and event bus. The event source sends the message to a specific channel on the event bus, and the listener subscribes to the specific channel. When a message is sent to a channel, listeners that subscribe to that channel are notified of the message.

Application

Android development

Notification service

Blackboard mode

This pattern is useful for problems where there is no definitive solution, and the blackboard pattern consists of three parts:

Blackboard-A structured global memory that contains objects in the solution domain

Knowledge Source-- A Professional Module with its own meaning

Control components-selection, configuration and execution modules

All components have access to the blackboard, and the component may produce new data objects to be added to the blackboard, and the component looks for specific types of data on the blackboard and can find that data by pattern matching with existing sources of knowledge.

Application

Speech recognition

Vehicle identification and tracking

Protein structure identification

Sonar signal interpretation

Interpreter mode

This pattern is often used to design components to interpret programs written in a special language, and it mainly specifies how to estimate program lines, that is, statements or expressions written in a particular language. The basic idea is to design a class for each language symbol.

Application

Database query language, such as SQL

A language used to describe communication protocols

Comparison of architectural patterns

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