spring 3.1 features worth knowing about
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Spring 3.1 Features Worth Knowing About (Available For Download Today)
Rossen Stoyanchev, Software Engineer
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Environment
Java Configuration DSL
Cache Abstraction
Agenda
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Moving an Application Across Environments
DATA SOURCE
TRANSFER SERVICE
ACCOUNT DAO
DEV
QA
PROD
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Environment-Specific Properties In XML
dev/database.properties
qa/database.properties
prod/database.propertiesjava -DENV=prod ...
Property Source:dev/database.properties
Property Source: Java system property
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Environment-Specific Properties In Java
Property Source: Java system property?
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Spring EL Expressions in Spring 3.0
Easier to see where properties originate from
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What About “Structural” Differences ?
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prod/database-context.xml
dev/database-context.xml
app-context.xml
Environment-Specific Configuration in XML
Choose from multiple files to accommodate differences
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Environment-Specific Configuration in Java
Accommodate differences in code
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A concrete representation with two key aspects
• Property Sources
• Bean Profiles
Bean Profile:
A logical group of bean definitions. Registered only if the profile is active.
Property Source:
A variety of sources: property files, system properties, servlet context, JNDI, etc.
Spring 3.1 “Environment” Abstraction
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In standalone code
In a Web application
• Implement ApplicationContextInitializer
• Register via contextInitializerClasses context parameter in web.xml
Default property sources
• JVM properties
• System envrionment variables
Managing Property Sources
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In standalone code
Via @Autowired or EnvironmentAware interface
In configuration (via placeholders)
<context:property-placeholder/> also now falls back on Environment property sources
Accessing Environment Properties
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Assign all beans to profile
Assign enclosed beans to a profile
Beans Profiles With XML
Multiple profiles can be listed
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Bean Profiles In Java
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In code
In Web applications
Bean Profile Activation
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Environment
Java Configuration DSL
Cache Abstraction
Agenda
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Custom XML namespaces have become very popular
• In Spring and in other frameworks
Succinct and highly expressive
Each namespace element can result in the registration of any number of bean definitions
Question:
How do get the same benefits in Java configuration?
Custom XML Namespaces
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Java configuration equivalent to an XML namespace
Declared in @FeatureConfiguration classes
Results in same bean declarations as <tx:annotation-driven />
Feature Specifications
Beans declared elsewhere can be autowired in.
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FeatureSpecifications Are Designed For Ease of Use
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Environment
Java Configuration DSL
Cache Abstraction
Agenda
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CacheManager and Cache abstractions
• org.springframework.cache
Backend adapters for EhCache, GemFire, Coherence, etc.
Cache namespace
• <cache:annotation-driven />
CacheManager SPI
• EhCacheManager
• GemFireCacheManager
Spring 3.1 Cache Abstraction
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Annotation-Based Caching
Cache name
Custom key
Cache condition
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Spring 3.1 M1 Blog Series:----------------------------------
http://blog.springsource.com/2008/03/26/spring-java-configuration-whats-new-in-m3/
https://github.com/cbeams/spring-3.1-profiles-xmlhttps://github.com/cbeams/spring-3.1-profiles-javahttps://github.com/cbeams/spring-3.1-featurespechttps://github.com/rstoyanchev/spring-3.1-mvc-java-config
Review updated Spring Reference Documentation
Provide feedback via JIRA and Forums
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Thank You