Gemini Blueprint – Converting from Spring OSGi

Gordon Dickens

Jun. 21, 12 · Java Zone · Interview

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Eclipse Virgo OSGi Enthusiasts, like myself, can now switch from the Spring OSGi namespace to the Eclipse Gemini Blueprint namespaces for bundles.

Maven Dependencies

<!-- Gemini Blueprint OSGi -->
<properties>
  <gemini.blueprint.version>1.0.0.RELEASE</gemini.blueprint.version>
</properties>
...
 
<dependency>
  <groupId>org.eclipse.gemini</groupId>
  <artifactId>org.eclipse.gemini.blueprint.extender</artifactId>
  <version>${gemini.blueprint.version}</version>
  <exclusions>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.beans</artifactId>
    </exclusion>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.core</artifactId>
    </exclusion>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.context</artifactId>
    </exclusion>
  </exclusions>
</dependency>
<dependency>
  <groupId>org.eclipse.gemini.blueprint</groupId>
  <artifactId>gemini-blueprint-mock</artifactId>
  <version>${gemini.blueprint.version}</version>
  <scope>test</scope>
</dependency>
<dependency>
  <groupId>org.eclipse.gemini</groupId>
  <artifactId>org.eclipse.gemini.blueprint.core</artifactId>
  <version>${gemini.blueprint.version}</version>
  <exclusions>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.aop</artifactId>
    </exclusion>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.beans</artifactId>
    </exclusion>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.core</artifactId>
    </exclusion>
    <exclusion>
      <groupId>org.springframework</groupId>
      <artifactId>org.springframework.context</artifactId>
    </exclusion>
  </exclusions>
</dependency>
<dependency>
  <groupId>org.eclipse.gemini</groupId>
  <artifactId>org.eclipse.gemini.blueprint.io</artifactId>
  <version>${gemini.blueprint.version}</version>
</dependency>

Repositories

<repository>
  <id>com.springsource.repository.bundle.external</id>
  <name>SpringSource Enterprise Bundle Repository - External Bundle Releases</name>
  <url>http://repository.springsource.com/maven/bundles/external</url>
</repository>

Eclipse Gemini Blueprint Config

XML Tag	Attributes	Description
<bean />	id, activation, depends-on, class, init-method, destroy-method, factory-method, factory-ref, scope	The type definition for a component. The bean’s attributes provide the characteristics for how to create the bean instance. Constructor arguments and injected properties are specified via child <argument> and <property> elements
<blueprint />	default-activation, default-timeout, default-availability,	The root element for a blueprint configuration file with two sections. The first section (contained within the <type-converters> element) identifies components that are used for converting values into different target types. The type converters are optional. The second section contains component definitions. Components are <bean>, <service>, <reference>, and <reference-list> elements that identify the bundle components that will be managed by the blueprint service
<description />		A generic element type to allow documentation to be added to the blueprint configuration
<compendium:cm-properties />	id, persistent-id, local-override, dynamic, init-lazy, init-timeout	Exposes the properties found in the Configuration Admin service under the given <persistent-id>
<compendium:managed-properties />	persistent-id, autowire-on-update, update-method	Defines a bean based on the given class name and configuration, with properties autowired-by-name based on the configuration stored under the given <persistent-id>
<compendium:managed-service-factory />	auto-export, autowire-on-update, context-class-loader, depends-on, factory-pid, interface, update-method	Defines a collection of beans based on the given class name, with properties <autowired-by-name> based on the configuration sets stored under the given factory <persistent-id>
<ref />	component-id	Defines a required <component-id> for the reference component
<reference />	id, activation, depends-on, interface, filter, component-name, availability	Defines the instances of a registered <service>, with a <timeout>. If the <timeout> is not specified, the <default-timeout> value is inherited from the encapsulating <blueprint> definition
<reference-list />	id, activation, depends-on, interface, filter, component-name, availability, member-type	Builds in the characteristics of the <service> type to define characteristics of the <reference-list>. This adds in the characteristics that only apply to collections of references via <member-type>. Subnodes can be <description >, <compendium:cm-properties >, <compendium:managed-properties >, <compendium:managed-service-factory >, <reference-listener >
<reference-listener />	ref, bind-method, unbind-method	A definition of a listener that will watch for bind/unbind events associated with the <service> reference. The listener can be a <ref> to a <bean> or <reference> element, or an inline <bean> or <reference>
<service />	id, activation, depends-on, interface, ref, auto-export, ranking	Defines the type for services exported by this blueprint bundle. Services are sourced by either a <ref> to a <bean> component or an <inline> bean component
<type-converters />		Defines a set of <bean>, <ref>, or <reference> elements that identify the type converter components

Examples

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0
    http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd"
  default-activation="eager">
 
  <!-- import the DataSource from OSGi -->
  <reference id="dataSource" interface="javax.sql.DataSource"/>
 
  <!-- export the directory bean to OSGi under the Directory interface -->
  <service ref="directory" interface="greenpages.Directory"/>
</blueprint>

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:compendium="http://www.eclipse.org/gemini/blueprint/schema/blueprint-compendium"
  xsi:schemaLocation="http://www.eclipse.org/gemini/blueprint/schema/blueprint-compendium
 
http://www.eclipse.org/gemini/blueprint/schema/blueprint-compendium/gemini-blueprint-compendium.xsd
 
http://www.osgi.org/xmlns/blueprint/v1.0.0
 
  http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd"
  default-activation="eager">
 
  <compendium:cm-properties id="database.props"
    persistent-id="greenpages.db.config"/>
 
  <!-- Export the JDBC DataSource with the Service Name 'dataSource' -->
  <service ref="dataSource" interface="javax.sql.DataSource"/>
</blueprint>

Resources

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