SpringDM笔记11-Hard dependencies on the OSGi environment
??? Any bean in a Spring DM application context can easily get a reference to its bundle context by implementing the BundleContextAware interface (located in the org.springframework.osgi.context
package). When instantiating the bean, the Spring DM application context implementation detects that it implements this special interface and automatically hands the bundle context to the bean by calling the sole method of the interface, setBundleContext.
1. 自动注入BundleContext
??? public class OsgiAddict implements BundleContextAware {
????? public void setBundleContext(BundleContext bundleContext) {
???????? ...
????? }
??? }
??? <bean id="osgiAddict" />
2. Setter注入BundleContext
??? public class PojoOsgiAddict {
??????? private BundleContext bundleContext;
??????? public void setBundleContext(BundleContext bundleContext) {
???????????? this.bundleContext = bundleContext;
??????? }
??? }
??? <bean id="pojoOsgiAddict" ref="bundleContext" />
??? </bean>
3. Interact declaratively with bundles
??? The Spring DM osgi namespace comes with a bundle element that makes it possible to get
??? references to OSGi bundles and even manipulate them. By using the bundle element in an
??? application context, you define an org.osgi.framework.Bundle bean in it. For example:
??? <osgi:bundle id="springDmExtenderBundle" symbolic-
???????????? name="org.springframework.osgi.extender" />
??? <osgi:bundle id="myBundle" location="file:/my/bundle/repo/somebundle.jar" action="start" />
??? Attributes of the bundle element:
??? (1)
??? Attribute name:id
??? Values:Any XML-valid ID
??? Description:Unique ID of the bean in the application context.
??? (2)
??? Attribute name:symbolic-name
??? Values:Any valid OSGi symbolic-name
??? Description:The symbolic name of an already installed bundle
??? (3)
??? Attribute name:location
??? Values:Spring resource syntax
??? Description:The location to load the bundle from, usually to interact with and call some lifecycle
??? methods.
??? (4)
??? Attribute name:start-level
??? Values:Integer
??? Description:The bundle start level.
??? (5)
??? Attribute name:action
??? Values:install, start, update, stop, uninstall
??? Description: An action executed on the bundle. This uses the same semantics as the methods
??? from the Bundle interface, with preconditions weakened.
??? (6)
??? Attribute name:
??? Values:install, start, update,stop, uninstall
??? Description:An action executed on the bundle when the application context is destroyed. This uses
??? the same semantics as the methods from the Bundle interface, with preconditions weakened.
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