Spring Cloud là gì?

Spring Cloud cung cấp các công cụ dành cho các developers có thể nhanh chóng xây dựng những mẫu thiết kế phổ biến trong các hệ thống phân tán, ví dụ như quản lý cấu hình, service discovery, circuit breakers, intelligent routing, micro-proxy, control bus, one-time tokens, global locks, leadership election, distributed session, cluster state). Điều phối các hệ thống phân tán dẫn đến các boiler plate patterns, và sử fungj Spring Cloud, các nhà phát triển có thể nhanh chóng dựng nên các services và ứng ựng mà hiện thực những patterns này. Chúng sẽ hoạt động tốt trong mọi môi trường phân tán, bao gồm cả máy tính của nhà phát triển đó, các trung tâm dữ liệ và các nền tảng như Cloud Foundry.
Spring Cloud xây dựng trên Spring Boot bằng việc cung cấp một tập các thư viện mà cải thiện hành vi của một ứng dụng khi thêm vào classpath. Bạn có thể tận dụng ưu điểm của hành vi mặc định để tạo một dự án quick start, và sau đó khi bạn cần, bạn có thể cấu hình hoặc mở rộng để tạo một custom solution.

Tính năng

Spring Cloud tập trung vào việc cung cấp trải nghiệm tốt cho các trường hợp điển hình và có cơ chế mở rộng cho các trường hợp khác.

• Distributed/versioned configuration
• Service registration and discovery
• Routing
• Service-to-service calls
• Load balancing
• Circuit Breakers
• Global locks
• Leadership election and cluster state
• Distributed messaging

Spring Cloud có hướng tiếp cận kiểu Declarative, và bạn thường có nhiều tính năng với chỉ cần một classpath change hoặc một annotaion.

Main Projects

Spring Cloud Config
Centralized external configuration management backed by a git repository. The configuration resources map directly to Spring `Environment` but could be used by non-Spring applications if desired.
Spring Cloud Netflix
Integration with various Netflix OSS components (Eureka, Hystrix, Zuul, Archaius, etc.).
Spring Cloud Bus
An event bus for linking services and service instances together with distributed messaging. Useful for propagating state changes across a cluster (e.g. config change events).
Spring Cloud for Cloud Foundry
Integrates your application with Pivotal Cloud Foundry. Provides a service discovery implementation and also makes it easy to implement SSO and OAuth2 protected resources.
Spring Cloud Open Service Broker
Provides a starting point for building a service broker that implements the Open Service Broker API.
Spring Cloud Cluster
Leadership election and common stateful patterns with an abstraction and implementation for Zookeeper, Redis, Hazelcast, Consul.
Spring Cloud Consul
Service discovery and configuration management with Hashicorp Consul.
Spring Cloud Security
Provides support for load-balanced OAuth2 rest client and authentication header relays in a Zuul proxy.
Spring Cloud Sleuth
Distributed tracing for Spring Cloud applications, compatible with Zipkin, HTrace and log-based (e.g. ELK) tracing.
Spring Cloud Data Flow
A cloud-native orchestration service for composable microservice applications on modern runtimes. Easy-to-use DSL, drag-and-drop GUI, and REST-APIs together simplifies the overall orchestration of microservice based data pipelines.
Spring Cloud Stream
A lightweight event-driven microservices framework to quickly build applications that can connect to external systems. Simple declarative model to send and receive messages using Apache Kafka or RabbitMQ between Spring Boot apps.
Spring Cloud Stream App Starters
Spring Cloud Stream App Starters are Spring Boot based Spring Integration applications that provide integration with external systems.
Spring Cloud Task
A short-lived microservices framework to quickly build applications that perform finite amounts of data processing. Simple declarative for adding both functional and non-functional features to Spring Boot apps.
Spring Cloud Task App Starters
Spring Cloud Task App Starters are Spring Boot applications that may be any process including Spring Batch jobs that do not run forever, and they end/stop after a finite period of data processing.
Spring Cloud Zookeeper
Service discovery and configuration management with Apache Zookeeper.
Spring Cloud for Amazon Web Services
Easy integration with hosted Amazon Web Services. It offers a convenient way to interact with AWS provided services using well-known Spring idioms and APIs, such as the messaging or caching API. Developers can build their application around the hosted services without having to care about infrastructure or maintenance.
Spring Cloud Connectors
Makes it easy for PaaS applications in a variety of platforms to connect to backend services like databases and message brokers (the project formerly known as "Spring Cloud").
Spring Cloud Starters
Spring Boot-style starter projects to ease dependency management for consumers of Spring Cloud. (Discontinued as a project and merged with the other projects after Angel.SR2.)
Spring Cloud CLI
Spring Boot CLI plugin for creating Spring Cloud component applications quickly in Groovy
Spring Cloud Contract
Spring Cloud Contract is an umbrella project holding solutions that help users in successfully implementing the Consumer Driven Contracts approach.
Spring Cloud Gateway
Spring Cloud Gateway is an intelligent and programmable router based on Project Reactor.
Spring Cloud OpenFeign
Spring Cloud OpenFeign provides integrations for Spring Boot apps through autoconfiguration and binding to the Spring Environment and other Spring programming model idioms.
Spring Cloud Pipelines
Spring Cloud Pipelines provides an opinionated deployment pipeline with steps to ensure that your application can be deployed in zero downtime fashion and easilly rolled back of something goes wrong.
Spring Cloud Function
Spring Cloud Function promotes the implementation of business logic via functions. It supports a uniform programming model across serverless providers, as well as the ability to run standalone (locally or in a PaaS).

Release Trains
Spring Cloud is an umbrella project consisting of independent projects with, in principle, different release cadences. To manage the portfolio a BOM (Bill of Materials) is published with a curated set of dependencies on the individual project (see below). The release trains have names, not versions, to avoid confusion with the sub-projects. The names are an alphabetic sequence (so you can sort them chronologically) with names of London Tube stations ("Angel" is the first release, "Brixton" is the second). When point releases of the individual projects accumulate to a critical mass, or if there is a critical bug in one of them that needs to be available to everyone, the release train will push out "service releases" with names ending ".SRX", where "X" is a number.