Spring Cloud in a nutshell

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Creative Commons Attr ibution-NonCommercial l icense: http://creativecommons.org/l icenses/by-nc/3.0/

Spring Cloud in a nutshell

Tsuyoshi Miyake, Pivotal Software, Inc. @tsuyoshimiyake

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Agenda

§  Spring Framework in a word!

§  What is Cloud Foundry? • History •  Java/Spring on CF

§  What is Spring Cloud? • Goals • @ServiceScan

•  Extension

§  Demo

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Spring Framework in a word!

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“Don't call us, we'll call you - Hollywood principle

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Container (App Server)

アプリケーション in アプリケーション・サーバー （コンテナ）

Application

Application Information (Context)

Service Service Service

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Yes, we know a lot..

GRAILS

Full-stack, Web

XD

Stream, Taps, Jobs

BOOT

Bootable, Minimal, Ops-Ready

Big, Fast,

Flexible Data

Web, Integration,

Batch

WEB

Controllers, REST, WebSocket

INTEGRATION

Channels, Adapters, Filters, Transformers

BATCH

Jobs, Steps, Readers, Writers

BIG DATA

Ingestion, Export, Orchestration, Hadoop

DATA

NON-RELATIONAL RELATIONAL

CORE

GROOVY FRAMEWORK SECURITY REACTOR

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What is Cloud Foundry?

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A bit history of Spring & Cloud Foundry

“Cloud Foundry will be the natural cloud deployment choice for Spring developers. Launching Cloud Foundry, The Industry’s First Open PaaS Rod Johnson, Spring Engineering Blog, Apr 12 2011

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3 meanings of Cloud Foundry for Spring/Java developers

As App Devs As Dev Ops As Dojo Devs

•  UAA/Login Server with Spring Security

•  Java Buildpack •  Service Broker with

Spring Boot/MVC

•  Spring + Grails native support

•  Gradle, Maven plugin •  Eclipse CF plugin

•  Spring Cloud (Today’s Topic)

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アプリケーションの Cloud Foundry Runtime へのデプロイ

①  アプリケーションとメタデータの push

push app

Router  ②  サービスの作成とバインド

③  アプリケーションのステージング

④  アプリケーションのデプロイ

⑤  アプリケーションのヘルスチェック Pivotal  CF  Elas1c  Run1me  

Blobstore DB

Cloud Controller Service Broker Node(s)

DEA DEA

DEA DEA

+ app MD

+ =

Service credentials

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サービスの作成とバインディング

Router  

Cloud  Foundry  Run1me  (ERS)  

DB Service credentials

reserve resources create service (HTTP) create service (HTTP)

bind service (HTTP) bind service (HTTP) obtain connection data

CLI Cloud Controller

Service Broker

Data Service

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アプリケーションのステージング Ro

uter  

Blobstore DB

DEA Detect Compile Upload No Yes System

Buildpacks

+ =

Cloud Controller

Pivotal  CF  Elas1c  Run1me  

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What is Spring Cloud?

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“Spring Cloud is DI Container

for Cloud OS - Anonymous

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Container (Cloud Foundry)

アプリケーション in Cloud Foundry （コンテナ）

Application

Application Information (Context)

Service Service Service

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Spring Cloud Goals

§  クラウド内のアプリケーション環境、およびサービスの抽象化

§  多様なクラウドへの対応 • Cloud Foundry • Heroku

•  Local

§  拡張性 • 新クラウド環境への対応

• 新サービスへの対応

• 新フレームワークへの対応

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Service Scan (@ServiceScan)

§  Java Config (@Configuration) と併用

§  アプリケーションにバインドされたサービスをスキャン

§  各サービスについて Bean を作成

§  (Option) クラウド環境でのみ有効にするためには @Profile(“cloud”) を追加

@Configuration@ServiceScan// @Profile("cloud”)public class CloudConfig {}

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Service Scan (@ServiceScan) カスタマイズ

§  パターン 1 : 同一タイプのサービス (e.g. DataSource) が 2 つ以上ある

§  パターン 2 : 各サービスの細かな設定が必要

§  パターン 3 : 独自サービスが必要

@Configurationpublic class CloudConfig extends AbstractCloudConfig { @Bean　　　　public DataSource mysqlDataSource() {

return connectionFactory().dataSource("mysql-service"); } @Bean public DataSource postgresDataSource() {

PoolConfig poolConfig = new PoolConfig(20, 200);ConnectionConfig connectionConfig = new ConnectionConfig("characterEncoding=UTF-8");DataSourceConfig serviceConfig = new DataSourceConfig(poolConfig, connectionConfig);return connectionFactory().dataSource("postgres-service”, serviceConfig);

}}

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拡張性 (1) – 新クラウド環境への対応 (Cloud Platform)

§  CloudConnector interface を実装 •  isInMatchingCloud(): 意図した Cloud 環境かどうかを判定 •  getApplicationInstanceInfo(): アプリケーションの情報（ID, ホスト名など）を返す

•  getServiceInfos(): アプリケーションが利用可能なサービスの接続情報を返す

§  Cloud Platform の登録 • META-INF/services/org.springframework.cloud.CloudConnector に実装クラス

•  java.util.ServiceLoader により load() される

public interface CloudConnector {boolean isInMatchingCloud();ApplicationInstanceInfo getApplicationInstanceInfo();List<ServiceInfo> getServiceInfos();

}

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拡張性 (1) – 新クラウド環境への対応 (Cloud Platform)

§  CloudFoundry での実装例 (CloudFoundryConnector)

public class CloudFoundryConnector extends AbstractCloudConnector<Map<String,Object>> { public boolean isInMatchingCloud() { return environment.getEnvValue("VCAP_APPLICATION") != null; } public ApplicationInstanceInfo getApplicationInstanceInfo() { Map<String, Object> rawApplicationInstanceInfo = objectMapper.readValue( environment.getEnvValue("VCAP_APPLICATION"), Map.class); … } protected List<Map<String,Object>> getServicesData() { String servicesString = environment.getEnvValue("VCAP_SERVICES"); … }}

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拡張性 (2) – 新サービスへの対応

§  ServiceInfoCreator interface を実装 •  accept(): 引数 Service Data を調べ、該当サービスでハンドル可能か判断 •  createServiceInfo(): サービス情報（URI など）を返す

§  サービスの登録 • META-INF/services/ 以下に実装クラスを列挙したファイルを置く • 名称は Cloud Platform 依存

org.springframework.cloud.cloudfoundry.CloudFoundryServiceInfoCreator

• CloudFoundry の場合 MysqlServiceInfoCreator, MongoServiceInfoCreator など

public interface ServiceInfoCreator<SI extends ServiceInfo, SD> {public boolean accept(SD serviceData);public SI createServiceInfo(SD serviceData);

}

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拡張性 (2) – 新サービスへの対応

§  CloudFoundry での実装例 (MongoServiceInfoCreator)

public class MongoServiceInfoCreator extends CloudFoundryServiceInfoCreator<MongoServiceInfo> { public boolean accept(Map<String, Object> serviceData) { return tagsMatch(serviceData) || labelStartsWithTag(serviceData) || uriMatchesScheme(serviceData); } public MongoServiceInfo createServiceInfo(Map<String,Object> serviceData) { @SuppressWarnings("unchecked") Map<String,Object> credentials = (Map<String, Object>) serviceData.get("credentials"); String id = (String) serviceData.get("name"); String uri = getStringFromCredentials(credentials, "uri", "url"); return new MongoServiceInfo(id, uri); }}

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拡張性 (3) – 新フレームワークへの対応

§  spring-service-connector のみが Spring に依存

§  つまりここを “my-service-connector” にすることで独自のフレームワークに対

応可能

§  具体的には

ServiceConnectorCreator.create() を実装し、ServiceInfo (MysqlServiceInfo) からフレームワー

クの Object (DataSource) に変換

spring-service-connector

core

cloudfoundry-connector

heroku-connector

localconfig-connector

Spring Cloud

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Demo

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hello-spring-cloud

SPRING CLOUD

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Learn More. Stay Connected.

§  Spring Cloud Project: http://projects.spring.io/spring-cloud/

§  Source Code: https://github.com/spring-projects/spring-cloud

§  Sample: https://github.com/cloudfoundry-samples/hello-spring-cloud

§  Recording: https://www.youtube.com/watch?v=F49_LJJPs_s

§  Blogs •  https://spring.io/blog/2014/06/03/introducing-spring-cloud •  https://spring.io/blog/2014/07/29/using-spring-cloud-programmatically

•  https://spring.io/blog/2014/08/05/extending-spring-cloud