As some of you might know e(fx)clipse provides a Eclipse DI extension supporting more powerful feature when we deal with OSGi-Services:

• Support for dynamics (eg if a higher-ranked service comes along you get it injected, …)
• Support for service list
• ServiceFactory support because the request is made from the correct Bundle

Since tonights build the @Service annotation has support to define:

• A static compile time defined LDAP-Filter expression

  public class MySQLDIComponent {
    @Inject
    public void setDataSource(
      @Service(filterExpression="(dbtype=mysql)") 
      DataSource ds) {
       // ...
    }
  }
  
  public class H2DIComponent {
    @Inject
    public void setDataSource(
      @Service(filterExpression="(dbtype=h2)") 
      DataSource ds) {
       // ...
    }
  }
  

• A dynamic LDAP-Filter expression who is calculated at runtime and can change at any time

  public class CurrentDatasource extends BaseValueObservable<String> implements OString {
    @Inject
    public CurrentDatasource(
      @Preference(key="database",defaultValue="h2") String database) {
      super("(dbtype="+database+")");
    }
  
    @Inject
    public void setDatabase(
      @Preference(key="database",defaultValue="h2") String database) {
      setValue("(dbtype="+database+")");
    }
  }
  
  public class DIComponent {
    @Inject
    public void setDataSource(
      @Service(dynamicFilterExpression=CurrentDatasource.class)
      DataSource ds) {
      // ...
    }
  }
  

  You notice the dynamic provider itself if integration fully into the DI-Story 😉