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Peter Ledbrook
Grails in the Enterprise
1Monday, 30 May 2011
Integration Points
• Build• Dependencies• Database• Deployment• Spring
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2Monday, 30 May 2011
Integration Points
• Build• Dependencies• Database• Deployment• Spring
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Build
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Ant Integration
• An Ant task built in (grails.ant.GrailsTask)• Template Ant build:
grails integrate-with --ant• Uses Ivy for dependency management• Not compatible with Ant 1.8
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Maven
• Maven Grails Plugin: https://github.com/grails/grails-maven
• Use Maven 2 to build Grails projects• Declare dependencies in POM• Works for both applications and plugins!• Integration test framework:
https://github.com/grails/grails_maven_plugin_testing_tests
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Getting Started
mvn archetype-generate ...
mvn initialize
Set MAVEN_OPTS
Optional: add ‘pom true’ to dependency DSL
e.g. -Xmx256m -XX:MaxPermSize=256m
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Packaging Types
• ‘war’– Must configure execution section– Works with plugins that depend on ‘war’
• ‘grails-app’– Less configuration
• ‘grails-plugin’– For plugins!
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Maven & Grails Plugins
> grails release-plugin
==
> mvn deploy
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Maven & Grails Plugins
<dependency> <groupId>org.grails.plugins<groupId> <artifactId>hibernate</artifactId> <type>grails-plugin</type></dependency>
Either:
Use ‘mvn deploy’ or Release plugin!
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And ‘pom: false’
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Maven & Grails Plugins
grails.project.dependency.resolution = { ... plugins { compile ":hibernate:1.3.6" } ...}
Or:
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Customise the Build
• Create new commands in <proj>/scripts• Package the commands in a plugin!• Create <proj>/scripts/_Events.groovy
– Interact with standard build steps– Add test types– Configure embedded Tomcat
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What the future holds...
• Grails 2.0 will move to Gradle– More powerful and more flexible– Standard, well documented API– Ant & Maven support
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Integration Points
• Build• Dependencies• Database• Deployment• Spring
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Dependency DSL
grails.project.dependency.resolution = { inherits "global" log "warn" repositories { grailsHome() mavenCentral() mavenRepo "http://localhost:8081/..." } ...}
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Dependency DSL
grails.project.dependency.resolution = { inherits "global" log "warn" ... dependencies { compile "org.tmatesoft.svnkit:svnkit:1.3.3" test "org.gmock:gmock:0.8.1" } ...}
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Integration Points
• Build• Dependencies• Database• Deployment• Spring
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‘Legacy’ Databases
• Grails can create a database from your domain model...• ...but what if you don’t own the database?
– DBA determines structure– Company conventions– Existing ‘legacy’ database
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class Book { ... static mapping = { table "books" title type: "books" author column: "author_ref" }}
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Option 1: Custom ORM mapping
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Option 2: JPA annotations
<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE ...><hibernate-configuration> <session-factory> <mapping class="org.ex.Book"/> <mapping class="org.ex.Author"/> ... </session-factory></hibernate-configuration>
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<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE ...><hibernate-configuration> <session-factory> <mapping resource="org.ex.Book.hbm.xml"/> <mapping resource="org.ex.Author.hbm.xml"/> ... </session-factory></hibernate-configuration>
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Option 3: Hibernate XML Mappings
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constraints = { title blank: false, unique: true ...}
Constraints
Given domain class:
Then:
org.example.myapp.domain.Book
src/java/org/example/myapp/domain/BookConstraints.groovy
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• GORM layer over JPA• Use your own JPA provider• Useful for cloud services that only work with JPA, not
Hibernate
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Option 4: GORM JPA Plugin
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Share your model!
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Database Management
• Hibernate auto-DDL– Good for dev & test– Bad for production!
• Data migration– http://grails.org/plugin/database-migration
• Reverse engineer a model– http://grails.org/plugin/db-reverse-engineer
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Integration Points
• Build• Dependencies• Database• Deployment• Spring
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grails war
• Build properties:– grails.war.copyToWebApp– grails.war.dependencies– grails.war.resources– grails.project.war.file
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Control of JARs
grails.project.dependency.resolution = { defaultDependenciesProvided true inherits "global" log "warn" ...} grails war --nojars => WEB-INF/lib/<empty>
=> No Grails JARs in WEB-INF/lib
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Data Source
dataSource { jndiName = "java:comp/env/myDataSource"}
JNDI:
dataSource { url = System.getProperty("JDBC_STRING")}
System property:
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Data Source
grails.config.locations = [ "file:./${appName}-config.groovy", "classpath:${appName}-config.groovy" ]
Config.groovy:
For run-app: ./<app>-config.groovy
For Tomcat: tomcat/lib/<app>-config.groovy
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Integration Points
• Build• Dependencies• Database• Deployment• Spring
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Grails is Spring
• Spring MVC under the hood• Grails provides many useful beans
– e.g. grailsApplication• Define your own beans!
– resources.xml/groovy– In a plugin
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Example
import ...beans = { credentialMatcher(Sha1CredentialsMatcher) { storedCredentialsHexEncoded = true }
sessionFactory(ConfigurableLocalSessionFactoryBean) { dataSource = ref("dataSource") hibernateProperties = [ "hibernate.hbm2ddl.auto": "create-drop", "hibernate.show_sql": true ] }}
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Enterprise Integration
• Spring opens up a world of possibilities– Spring Integration/Camel– Messaging (JMS/AMQP)– ESB– RMI, HttpInvoker, etc.
• Web services & REST
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Grails Plugins
• Routing• JMS, RabbitMQ• CXF, Spring-WS, WS-Client• REST
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Summary
• Various options for integrating Grails with:– Development/build– Deployment processes
• Works with many external systems– Solid support for non-Grailsy DB schemas– Flexible messaging & web service support
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Thank you!
Q & A
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