Download - Simplify Cloud Applications using Spring Cloud

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Simplify Cloud Applications using Spring Cloud

Ramnivas Laddad and Scott Frederick

Agenda

• Spring Cloud Basics • Application Config Options

• Java config • XML config

• Extensibility mechanism • Cloud Platforms • Cloud Services • Frameworks

• Spring Boot Integration

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Cloud Apps Awareness

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Application

Container


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Application

Container


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Application

App Instance

Information

Container


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Application

Service

App Instance

Information

Container


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Application

Service

Services

Information

App Instance

Information

Cloud Apps Awareness: Cloud Foundry Instance Information

{ "limits": { "mem" : 512, "disk" : 1024, "fds" : 16384 }, "application_version":"5e6fe3f7-6900-4af8-8376-bf3223ce886b", "application_name":"hello-spring-cloud", "application_uris":["myapp.cfapps.io"], "version":"5e6fe3f7-6900-4af8-8376-bf3223ce886b", "name":"hello-spring-cloud", "space_name":"development", "space_id":"5f629937-1821-4f48-9eb4-8c67c70c0df0", "instance_id":"b84fa4cd1c75431486dec1609828ae36", "instance_index":0, "host":"0.0.0.0", "port":63202, "started_at_timestamp":1401394307, "state_timestamp":1401394307}

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VCAP_APPLICATION env variable

Cloud Apps Awareness: Cloud Foundry Services

{ "elephantsql": [ { "name" : "inventory-db", "label" : "elephantsql", "tags" : ["relational","Data Store","postgresql"], "plan" : "turtle", "credentials" : { "uri" : "postgres://user:[email protected]:5432/db", "max_conns" : "5" } } ], "rediscloud": [ { "name" : "rediscloud-service", "label" : "rediscloud", "tags" : ["key-value","redis","Data Store"], "plan" : "25mb", "credentials" : { "hostname" : "pub-redis.garantiadata.com", "port" : "11853", "password" : "pass" } } ]}

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VCAP_SERVICES env variable

Cloud Apps Awareness: Heroku Instance Information• Individual env variables !

PORT 12345! DYNO web.1!

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Cloud Apps Awareness: Heroku Services

• One environment variable per service !

HEROKU_POSTGRESQL_PURPLE_URL postgres://user:[email protected]:5432/db!

REDISCLOUD_URL redis://rediscloud:[email protected]:19038

REDISTOGO_URL redis://redistogo:[email protected]:9139

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Spring Cloud Goals

• Abstraction over cloud services and application environment • Implementation for multiple cloud platforms

• Cloud Foundry • Heroku • Local testing simulating a cloud-like environment

• Extensibility without modifying the core code • Cloud Connector • Service Creator

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Using Java Config

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Scanning for services

!!

@Configuration@CloudScanpublic class CloudConfig {!}

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Taking over control

@Configurationpublic class CloudConfig extends AbstractCloudConfig {

@Beanpublic DataSource dataSource() { return connectionFactory().dataSource();}!

@Bean public MongoDbFactory mongoDb() { return connectionFactory().mongoDbFactory(); }}

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Taking over control: Working with specific services

@Configurationpublic class CloudConfig extends AbstractCloudConfig { @Bean

public DataSource inventoryDataSource() { return connectionFactory().dataSource("inventory-service");}!

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

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Taking over control: Configuring Services

@Configurationpublic class CloudConfig extends AbstractCloudConfig { @Bean public DataSource inventoryDataSource() { PoolConfig poolConfig = new PoolConfig(20, 200); ConnectionConfig connectionConfig = new ConnectionConfig("characterEncoding=UTF-8"); DataSourceConfig serviceConfig = new DataSourceConfig(poolConfig, connectionConfig); return connectionFactory().dataSource( "inventory-service", serviceConfig); }}

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Acquiring generic services

@Configurationpublic class CloudConfig extends AbstractCloudConfig { @Bean public Search search() { return connectionFactory().service( "search-service", Search.class); }}

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Demo Spring Cloud on Cloud Foundry

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Deploy to Cloud Foundry

$ gradle assemble $ cf create-service cleardb spark cities-db $ cf push

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---applications:- name: cities host: cities-s12gx path: build/libs/spring-boot-cities.jar services: - cities-db env: SPRING_PROFILES_ACTIVE: cloud

http://cities-s12gx.cfapps.io/

http://cities-s12gx.cfapps.io/

Demo Spring Cloud on Heroku

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Deploy to Heroku

$ heroku create cities-s12gx --stack cedar --buildpack http://github.com/heroku/heroku-buildpack-java.git $ heroku config:set SPRING_CLOUD_APP_NAME=spring-boot-cities $ heroku config:set SPRING_PROFILES_ACTIVE=cloud $ heroku addons:add heroku-postgresql:hobby-dev $ git push heroku master

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http://cities-s12gx.herokuapp.com/

http://github.com/heroku/heroku-buildpack-java.git

http://cities-s12gx.herokuapp.com/

Using XML Config

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Scanning for services

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<cloud:service-scan/>

Taking over control

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<cloud:data-source/>!<cloud:mongo-db-factory/>!...

Taking over control: Specifying services

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<cloud:data-source service-name="inventory-service"/>!<cloud:data-source service-name="customers-service"/>

Taking over control: Configuring Services

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<cloud:data-source service-name="inventory-service"> <cloud:pool pool-size="20" max-wait-time="200"/> <cloud:connection properties="characterEncoding=UTF-8"/></cloud:data-source>


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<cloud:service service-name="search-service"/>


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<cloud:service service-name="search-service"/>

<cloud:service service-name="search-service" connector-type="com.example.Search"/>

Services Supported

• Cloud Foundry, Heroku, and Local connectors with Spring • MySQL, Postgres, Oracle • Redis • MongoDB • AMQP / RabbitMQ • SMTP

• Pivotal CF connectors with Spring • Pivotal HD

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Demo Spring Cloud with Hadoop

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Explicit Cloud Config

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@org.springframework.context.annotation.Configurationpublic class CloudConfig extends AbstractCloudConfig { @Bean public ConnectionFactory rabbitConnectionFactory() { return connectionFactory().rabbitConnectionFactory(); } @Bean public DataSource hawqDataSource() { return connectionFactory().dataSource("phd-service/hawq"); }! @Bean public DataSource gemfirexdDataSource() { return connectionFactory().dataSource("phd-service/gemfirexd"); } @Bean public Configuration hadoopConfiguration() { return connectionFactory().service(Configuration.class); }}

Consuming Service Beans: Explicit Config

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@Autowired @Qualifier("hawqDataSource") DataSource hawqDataSource; @Autowired @Qualifier(“gemfirexdDataSource")DataSource gemfirexdDataSource;!@Autowired ConnectionFactory rabbitConnectionFactory;!@Autowired Configuration hadoopConfiguration;!!

Cloud Config with Scanning

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@Configuration@CloudScanpublic class CloudConfig {}

Consuming Service Beans: Explicit Config

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@Autowired @Qualifier("phd-service/hawq") DataSource hawqDataSource; @Autowired @Qualifier("phd-service/gemfirexd")DataSource gemfirexdDataSource;!@Autowired ConnectionFactory rabbitConnectionFactory;!@Autowired Configuration hadoopConfiguration;

Spring Cloud Extensibility

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Axes of Extensibility

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Cloud Platform


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Cloud Platform

Cloud Services


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Cloud Platform

Cloud Services

Framework Support

Service Connector

ServiceInfo

Extensibility Overview

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CloudConnector ServiceConnectorCreator

Service ConnectorService Connector

Cloud Platform Extensibility

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

Registering Cloud Connector

!• Add a line with the class name to /META-INF/services/org.springframework.cloud.CloudConnector!!!!

• Cloud Foundry example:! org.springframework.cloud.cloudfoundry.CloudFoundryConnector!

•Heroku example:!org.springframework.cloud.heroku.HerokuConnector

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Cloud Service Extensibility

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public interface ServiceInfo { public String getId();}


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

public interface ServiceInfo { public String getId();}

Registering Service Info Creators

• Each Cloud Connector can choose any scheme it prefers !• Cloud Foundry Cloud Connector example

/META-INF/services/org.springframework.cloud.cloudfoundry.CloudFoundryServiceInfoCreator

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Registering Service Info Creators

• Each Cloud Connector can choose any scheme it prefers !• Cloud Foundry Cloud Connector example

/META-INF/services/org.springframework.cloud.cloudfoundry.CloudFoundryServiceInfoCreator

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org.springframework.cloud.cloudfoundry.MysqlServiceInfoCreatororg.springframework.cloud.cloudfoundry.PostgresqlServiceInfoCreatororg.springframework.cloud.cloudfoundry.RedisServiceInfoCreatororg.springframework.cloud.cloudfoundry.MongoServiceInfoCreatororg.springframework.cloud.cloudfoundry.AmqpServiceInfoCreatororg.springframework.cloud.cloudfoundry.MonitoringServiceInfoCreatororg.springframework.cloud.cloudfoundry.SmtpServiceInfoCreatororg.springframework.cloud.cloudfoundry.OracleServiceInfoCreator

Framework extensibility

• Mapping ServiceInfo to framework-specific service connector • RelationalServiceInfo -> DataSource • MongoServiceInfo -> MongoDbFactory • ...

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public interface ServiceConnectorCreator<SC, SI extends ServiceInfo> { ! SC create(SI serviceInfo, ServiceConnectorConfig serviceConnectorConfig); Class<SC> getServiceConnectorType();! Class<?> getServiceInfoType();}

Framework extensibility registration

• Each framework may choose any mechanism!!

• Spring Connection Creator example!/META-INF/services/org.springframework.cloud.service.ServiceConnectorCreator

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Framework extensibility registration

• Each framework may choose any mechanism!!

• Spring Connection Creator example!/META-INF/services/org.springframework.cloud.service.ServiceConnectorCreator

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org.springframework.cloud.service.relational.MysqlDataSourceCreatororg.springframework.cloud.service.relational.PostgresqlDataSourceCreatororg.springframework.cloud.service.relational.OracleDataSourceCreatororg.springframework.cloud.service.keyval.RedisConnectionFactoryCreatororg.springframework.cloud.service.document.MongoDbFactoryCreatororg.springframework.cloud.service.messaging.RabbitConnectionFactoryCreatororg.springframework.cloud.service.smtp.MailSenderCreator

Demo Spring Cloud to Consume a Microservice

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Deploy to Cloud Foundry

$ gradle assemble $ cf create-user-provided-service cities-ws -p '{"url": "http://cities-s12gx.cfapps.io/", "tag": "cities"}' $ cf push

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---applications:- name: cities-ui host: cities-ui-s12gx path: build/libs/spring-boot-cities-ui.war services: [ cities-ws ] env: SPRING_PROFILES_ACTIVE: cloud

http://cities-ui-s12gx.cfapps.io

http://cities-ui-s12gx.cfapps.io

Spring Boot Integration

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Auto-configuration

• Add spring-cloud dependencies in project • … that’s it !!

• The same effect as adding @CloudScan

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Available in Spring Boot 1.2.x

Spring Cloud starter

!<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cloud</artifactId></dependency>

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Available in Spring Boot 1.2.x

What’s next

• Support for many more services • Elasticsearch • Memcache • Riak • Cassandra • Neo4j • ...

• Support for other cloud platforms • Support for other frameworks?

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What’s next

• Support for many more services • Elasticsearch • Memcache • Riak • Cassandra • Neo4j • ...

• Support for other cloud platforms • Support for other frameworks?

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Community Contributions Welcome!

Download - Simplify Cloud Applications using Spring Cloud

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