This presentation might be obsoleted: Please refer to http://www.slideshare.net/tsuyo/ss-47021186 as a new one (“Spring Cloud” used to mean “Spring Cloud Connectors” only, but now it means comprehensive tools for distributed systems including Spring Cloud Connectors. Refer to the presentation above for the details)

1. 1 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring Cloud in a Nutshell
Tsuyoshi Miyake, Pivotal Software, Inc.
@tsuyokb

2. 2 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Agenda
§ Spring Framework in a word!
§ What is Cloud Foundry?
• History
• Java/Spring on CF
§ What is Spring Cloud?
• Goals
• @ServiceScan
• Extension
§ Demo

3. 3 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Spring Framework in a word!

4. 4 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
“Don't call us, we'll call you
- Hollywood principle

5. 5 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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

6. 6 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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-RELATIONALRELATIONAL
CORE
GROOVYFRAMEWORK SECURITY REACTOR

7. 7 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
What is Cloud Foundry?

8. 8 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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

9. 9 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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)

10. 10 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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
Elastic Runtime
Blobstore DB
Cloud
Controller
Service Broker
Node(s)
DEA
DEA
DEA
DEA
+ app MD
+ =
Service
credentials

11. 11 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
サービスの作成とバインディング
Router
Cloud Foundry
Runtime (ERS)
DB
Service
credentials
reserve resourcescreate service (HTTP) create service (HTTP)
bind service (HTTP)bind service (HTTP)
obtain connection
data
CLI Cloud
Controller
Service
Broker
Data
Service

12. 12 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
アプリケーションのステージングRouter
Blobstore DB
DEA Detect
Compile Upload
NoYes
System
Buildpacks
+ =
Cloud Controller
Pivotal CF
Elastic Runtime

13. 13 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
What is Spring Cloud?

14. 14 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
“Spring Cloud is DI Container
for Cloud OS
- Anonymous

15. 15 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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

16. 16 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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

17. 17 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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 {
}

18. 18 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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
@Configuration
public 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);
}
}

19. 19 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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();
}

20. 20 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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");
…
}
}

21. 21 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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);
}

22. 22 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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);
}
}

23. 23 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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

24. 24 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Demo
Unless otherwise indicated, these slides are
© 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
hello-spring-cloud
SPRING CLOUD

25. 25 Unless otherwise indicated, these slides are © 2013-2014 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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