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OSGi Blueprint Services




                     Blueprint Services

                          DI brought to OSGi


                             Guillaume Nodet
OSGi Blueprint Services



                                       Author
          • Guillaume Nodet
          • ASF Member, VP Apache ServiceMix,
            PMC member of various Apache
            projects (ServiceMix, Felix, Geronimo,
            Mina …)
          • Software Architect at Progress Software
          • OSGi Enterprise Expert Group



OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   1
OSGi Blueprint Services



                                     Agenda
          •    Introduction
          •    Configuration
          •    Beans
          •    Service references
          •    Service registrations
          •    Advanced uses
          •    Next steps
          •    Conclusion

OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   2
OSGi Blueprint Services



                             Introduction
          •    Dependency injection / IOC
          •    Handle legacy code
          •    Handle the OSGi dynamics
          •    Hide the OSGi API




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   3
OSGi Blueprint Services



                                   Configuration
          • Extender pattern
          • XML resources
          • Metadata


                Blueprint Bundle                                     Metadata
                                               XML




                                              Blueprint Extender




OSGi DevCon, June 22, 2009         Copyright Guillaume Nodet, Licensed under ASL 2.0   4
OSGi Blueprint Services



                       Blueprint XML definition

             blueprint ::= <type-converters> manager *
             manager ::= <bean> | <service> | service-reference
             service-reference ::= <reference> | <ref-list>
             type-converter ::= <bean> | <ref>




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   5
OSGi Blueprint Services



                             Simple example

          <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”>
              <service interface=“osgi.devcon.User”>
                  <bean class=“osgi.devcon.impl.UserImpl”>
                       <argument value=“gnodet” />
                  </bean>
              </service>
          </blueprint>




          bundleContext.registerService(
              osgi.devcon.User.class.getName(),
              new osgi.devcon.impl.UserImpl(“gnodet”),
              new Hashtable());



OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   6
OSGi Blueprint Services



                             Simple example

          <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”>
              <service interface=“osgi.devcon.User”>
                  <bean class=“osgi.devcon.impl.UserImpl”>
                       <argument value=“gnodet” />
                  </bean>
              </service>
          </blueprint>              Top level element



          bundleContext.registerService(
              osgi.devcon.User.class.getName(),
              new osgi.devcon.impl.UserImpl(“gnodet”),
              new Hashtable());



OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   7
OSGi Blueprint Services



                             Simple example

          <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”>
              <service interface=“osgi.devcon.User”>
                  <bean class=“osgi.devcon.impl.UserImpl”>
                       <argument value=“gnodet” />
                  </bean>
              </service>
          </blueprint>      Blueprint namespace



          bundleContext.registerService(
              osgi.devcon.User.class.getName(),
              new osgi.devcon.impl.UserImpl(“gnodet”),
              new Hashtable());



OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   8
OSGi Blueprint Services



                             Simple example

          <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”>
              <service interface=“osgi.devcon.User”>
                  <bean class=“osgi.devcon.impl.UserImpl”>
                       <argument value=“gnodet” />
                  </bean>
              </service>
          </blueprint>                          Manager definition



          bundleContext.registerService(
              osgi.devcon.User.class.getName(),
              new osgi.devcon.impl.UserImpl(“gnodet”),
              new Hashtable());



OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   9
OSGi Blueprint Services



                             Manager types
          • Bean
          • Single Service
            Reference
          • Multiple Service
            References
          • Service
            Registration



OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   10
OSGi Blueprint Services



                                Managers
          •    Described by some metadata
          •    Provide objects
          •    Activation / deactivation
          •    Dependencies (implicit or explicit)
          •    Initialization
                 – Eager
                 – Lazy
          • Id
          • Inlined managers
OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   11
OSGi Blueprint Services



                               Bean manager




                      <bean class=“osgi.devcon.impl.UserImpl”>
                          <argument value=”gnodet” />
                          <property name=“arrival” value=“22/06/09” />
                      </bean>




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   12
OSGi Blueprint Services



                                    Bean creation
          • Constructor creation
                             <bean class=“osgi.devcon.impl.UserImpl” />



                             new osgi.devcon.impl.UserImpl()



          • Constructor creation with arguments
                             <bean class=“osgi.devcon.impl.UserImpl”>
                                 <argument value=“gnodet” />
                             </bean>


                             new osgi.devcon.impl.UserImpl(“gnodet”)



OSGi DevCon, June 22, 2009            Copyright Guillaume Nodet, Licensed under ASL 2.0   13
OSGi Blueprint Services



                                    Bean creation
          • Static factory
                             <bean class=“osgi.devcon.impl.UserFactory”
                                   factory-method=“createUser”>
                                 <argument value=“gnodet” />
                             </bean>


                             osgi.devcon.impl.UserFactory
                                     .createUser( “gnodet”)




OSGi DevCon, June 22, 2009            Copyright Guillaume Nodet, Licensed under ASL 2.0   14
OSGi Blueprint Services



                                Bean creation
          • Instance factory
                      <bean factory-ref=“userFactory”
                            factory-method=“createUser”>
                          <argument value=“gnodet” />
                      </bean>


                      osgi.devcon.impl.UserFactory userFactory = …
                      userFactory.createUser( “gnodet”)




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   15
OSGi Blueprint Services



                             Bean arguments


                      <argument value=“gnodet”/>

                      <argument ref=“[refid]”/>

                      <argument>
                          [any value]
                      </argument>




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   16
OSGi Blueprint Services



                             Bean arguments


                      <argument value=“gnodet”/>

                      <argument ref=“[refid]”/>

                      <argument>
                          [any value]
                      </argument>                                                     Plain value




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0                 17
OSGi Blueprint Services



                             Bean arguments


                      <argument value=“gnodet”/>

                      <argument ref=“[refid]”/>

                      <argument>
                          [any value]
                      </argument>
                                                                            Reference to a top
                                                                             level manager




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0              18
OSGi Blueprint Services



                             Bean arguments


                      <argument value=“gnodet”/>

                      <argument ref=“[refid]”/>

                      <argument>
                          [any value]
                      </argument>
                                                                                Complex value




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0             19
OSGi Blueprint Services



                              Bean properties

                       <bean class=“osgi.devcon.impl.UserImpl”>
                           <property name=“userId” value=“gnodet” />
                       </bean>


                       UserImpl user = new osgi.devcon.impl.UserImpl();
                       user.setUserId(“gnodet”);




OSGi DevCon, June 22, 2009         Copyright Guillaume Nodet, Licensed under ASL 2.0   20
OSGi Blueprint Services



                              Bean properties

                       <bean class=“osgi.devcon.impl.UserImpl”>
                           <property name=“userId” value=“gnodet” />
                       </bean>


                       UserImpl user = new osgi.devcon.impl.UserImpl();
                       user.setUserId(“gnodet”);




                                                                                       Property name




OSGi DevCon, June 22, 2009         Copyright Guillaume Nodet, Licensed under ASL 2.0                   21
OSGi Blueprint Services



                              Bean properties

                       <bean class=“osgi.devcon.impl.UserImpl”>
                           <property name=“userId” value=“gnodet” />
                       </bean>


                       UserImpl user = new osgi.devcon.impl.UserImpl();
                       user.setUserId(“gnodet”);




                               Property value


OSGi DevCon, June 22, 2009         Copyright Guillaume Nodet, Licensed under ASL 2.0   22
OSGi Blueprint Services



                              Bean properties


                      <property name=“userId” value=“gnodet”/>

                      <property name=“userId” ref=“[refid]”/>

                      <property name=“userId”>
                          [any value]
                      </property>




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   23
OSGi Blueprint Services



                             Bean scope

          • Singleton
                 – a single instance will be reused
          • Prototype
                 – a new instance will be created each time it
                   is injected




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   24
OSGi Blueprint Services



                                       Values
          •    <null/>                                  •    <value>
          •    <bean>                                   •    <list>
          •    <reference>                              •    <set>
          •    <ref-list>                               •    <map>
          •    <service>                                •    <array>
          •    <ref>                                    •    <props>
          •    <idref>




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   25
OSGi Blueprint Services


                                      <ref />
          • Injects an object provided by the
            manager with the given id
                      <bean id=“regId” … />

                      <bean class=“osgi.devcon.impl.UserImpl”>
                          <property name=“registration”>
                              <ref component-id=“regId” />
                          </property>
                      </bean>



                      <bean class=“osgi.devcon.impl.UserImpl”>
                          <property name=“registration” ref=“regId” />
                      </bean>



OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   26
OSGi Blueprint Services


                                      <ref />
          • Injects an object provided by the
            manager with the given id
                                                                                      Property value
                      <bean id=“regId” … />

                      <bean class=“osgi.devcon.impl.UserImpl”>
                          <property name=“registration”>
                              <ref component-id=“regId” />
                          </property>
                      </bean>



                      <bean class=“osgi.devcon.impl.UserImpl”>
                          <property name=“registration” ref=“regId” />
                      </bean>



OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0                    27
OSGi Blueprint Services


                                  <idref />
          • Injects the id of an existing object


                      <bean id=“regId” … />

                      <bean class=“osgi.devcon.impl.UserImpl”>
                          <property name=“registrationId”>
                              <idref component-id=“regId” />
                          </property>
                      </bean>




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   28
OSGi Blueprint Services


                                     <value>
          • Insert the content of the element text

                    <bean class=“osgi.devcon.impl.UserImpl”>
                        <property name=“userId”>
                            <value>gnodet</value>
                        </property>
                    </bean>




                    <bean class=“osgi.devcon.impl.UserImpl”>
                        <property name=“userId” value=“gnodet” />
                    </bean>




OSGi DevCon, June 22, 2009       Copyright Guillaume Nodet, Licensed under ASL 2.0   29
OSGi Blueprint Services



          <list>, <set> and <array>
          • Inserts a collection of objects

             <list>
                 <list>
                     <value>2</value>
                     <value>7</value>                        Arrays.asList(
                 </list>                                         Arrays.asList(“2”,”7”),
                 <list value-type=“int”>                         Arrays.asList(9,5)
                     <value>9</value>                        )
                     <value>5</value>
                 </list>
             </list>




OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0            30
OSGi Blueprint Services



          <list>, <set> and <array>
          • Inserts a collection of objects

             <list>
                 <list>
                     <value>2</value>
                     <value>7</value>                        Arrays.asList(
                 </list>                                         Arrays.asList(“2”,”7”),
                 <list value-type=“int”>                         Arrays.asList(9,5)
                     <value>9</value>                        )
                     <value>5</value>
                 </list>
             </list>



                                                                Type of the values

OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0            31
OSGi Blueprint Services


                                        <map>
          • Inserts a map of objects
             <map>
                 <entry key="cheese" value="cheddar"/>
                 <entry key="fruit" value="orange"/>
             </map>


             <map>
                 <entry key-ref="keyId" value="cheddar"/>
                 <entry key="fruit" value-ref="valueId"/>
             </map>


             <map key-type=”...” value-type="... ">
                 <entry ...>
             </map>



OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   32
OSGi Blueprint Services


                                        <map>
          • Inserts a map of objects
             <map>
                 <entry>
                     <key>
                          <value type="org.osgi.framework.Version">
                               3.2.1
                          </value>
                     </key>
                     <bean ... />
                 </entry>
             </map>




OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   33
OSGi Blueprint Services


                                  <props>
          • Inserts a java.util.Properties object

             <props>
                 <prop key="1">one</prop>
                 <prop key="2" value="two" />
             </props>




OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   34
OSGi Blueprint Services



                         Components as values
          • Instances provided by managers can be
            injected



                             <list>
                                 <bean class="com.acme.FooImpl"/>
                             </list>




OSGi DevCon, June 22, 2009           Copyright Guillaume Nodet, Licensed under ASL 2.0   35
OSGi Blueprint Services



                             Service References
          • Single service: <reference>
          • Multiple services: <ref-list>

                 <reference id="user1"
                            interface="osgi.devcon.User"
                            filter="(name=gnodet)" />




                 <ref-list id=”all-users"
                           interface="osgi.devcon.User” />




OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   36
OSGi Blueprint Services


                                         <reference>
          •    Provides a proxy to an OSGi service
          •    Availability: mandatory or optional
          •    Timeout
          •    Damping

                                                      proxy

                                                                 backing
                                                                 service




                             injected beans                                   services            service providers




OSGi DevCon, June 22, 2009                    Copyright Guillaume Nodet, Licensed under ASL 2.0                       37
OSGi Blueprint Services


                                       <ref-list>
          • Provides a read-only and dynamic list of
            OSGi service
          • Availability: mandatory or optional



                                                                      backing
                                                                      service


                                       list



                      injected beans                      proxies                 services   service providers




OSGi DevCon, June 22, 2009             Copyright Guillaume Nodet, Licensed under ASL 2.0                         38
OSGi Blueprint Services



            Service References Listeners
                 <bean id="listener" ... />

                 <ref-list interface="osgi.devcon.User">
                     <reference-listener ref="listener"
                                         bind-method="bind"
                                         unbind-method="unbind" />
                 </ref-list>



                 public class Listener {
                     public void bind(User user) { }
                     public void unbind(User user) { }
                 }


                 public void (T)
                 public void (T, Map)
                 public void (ServiceReference)


OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   39
OSGi Blueprint Services



            Service References Listeners
                 <bean id="listener" ... />

                 <ref-list interface="osgi.devcon.User">
                     <reference-listener ref="listener"
                                         bind-method="bind"
                                         unbind-method="unbind" />
                 </ref-list>

                                                                                    Bind method
                 public class Listener {
                     public void bind(User user) { }
                     public void unbind(User user) { }
                 }


                 public void (T)
                 public void (T, Map)
                 public void (ServiceReference)


OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0                 40
OSGi Blueprint Services



                             Service registrations
          • Expose an object as an OSGi service
          • Register a ServiceFactory
          • Dependencies on service references

                 <service ref="user"
                          interface="osgi.devcon.User" />




                 <service auto-export="interfaces">
                     <bean class="osgi.devcon.impl.UserImpl” />
                 </service>



OSGi DevCon, June 22, 2009       Copyright Guillaume Nodet, Licensed under ASL 2.0   41
OSGi Blueprint Services



                             Service properties
          • Expose an object as an OSGi service


                 <service ref="fooImpl" interface="osgi.devcon.User">
                     <service-properties>
                         <entry key="name" value="gnodet"/>
                     </service-properties>
                 </service>




OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   42
OSGi Blueprint Services



           Service Registration Listeners
                 <bean id="listener" ... />

                 <service ref="..." interface="osgi.devcon.User">
                     <registration-listener
                         ref="listener"
                         registration-method="register"
                         unregistration-method="unregister" />
                 </ref-list>


                 public class Listener {
                     public void register(User user, Map props) { }
                     public void unregister(User user, Map props) { }
                 }



                 public void (T, Map)



OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   43
OSGi Blueprint Services



                                   Lifecycle




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   44
OSGi Blueprint Services



                                   Lifecycle
                                                                                 Support for lazy
                                                                                   activattion




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0                      45
OSGi Blueprint Services



                                   Lifecycle
                                                                                 Track mandatory
                                                                                    references




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0                     46
OSGi Blueprint Services



                                   Lifecycle




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   47
OSGi Blueprint Services



                             Advanced use
          • Conversions
          • Disambiguation
          • Creating custom converters
          • Use of <idref>
          • <ref-list> can be injected as
               List<ServiceReference>
          • Use of the ranking attribute on
               <service>
          • Blueprint Events

OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   48
OSGi Blueprint Services



                             Conversions
          •    Arrays, collections, maps
          •    Primitives / wrapped primitives
          •    Simple types with a String constructor
          •    Locale, Pattern, Properties, Class
          •    JDK 5 Generics
          •    Custom converters



OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   49
OSGi Blueprint Services



                             Disambiguation
          • Constructors / factory methods can
            have multiple overloads
                 public class Bar {
                     public Bar(File file) { ... }
                     public Bar(URI uri) { ... }
                 }


                 <bean class="foo.Bar">
                     <argument type="java.net.URI"
                               value="file://hello.txt"/>
                 </bean>




OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   50
OSGi Blueprint Services



                             Custom converters
    <type-converters>
        <bean id="converter1" class=”foo.DateTypeConverter">
            <property name="format" value="yyyy.MM.dd"/>
        </bean>
    </type-converters>

    <bean class=“...”>
        <property name=“date” value=“2009.06.22” />
    </bean>


    public class DateTypeConverter {
        public boolean canConvert(Object fromValue,
                                  CollapsedType toType) {
            ...
        }
        public Object convert(Object fromValue,
                              CollapsedType toType) throws Exception {
            ...
        }
    }

OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   51
OSGi Blueprint Services

                                  <ref-list> as
                             List<ServiceReference>



    <ref-list interface=“osgi.devcon.User”
              member-type=“service-reference” />




OSGi DevCon, June 22, 2009        Copyright Guillaume Nodet, Licensed under ASL 2.0   52
OSGi Blueprint Services



                             Other advanced uses
          • <ref-list> as
            List<ServiceReference>
              <ref-list interface=“osgi.devcon.User”
                        member-type=“service-reference” />



          • Use of ranking attribute on
            <service>
              <service ref=“foo”
                       interface=“osgi.devcon.User”
                       ranking=“5” />



OSGi DevCon, June 22, 2009       Copyright Guillaume Nodet, Licensed under ASL 2.0   53
OSGi Blueprint Services



                             Use of <idref>
          • Prototypes
          • Use of the Blueprint API
    <bean id=“bar” class=“foo.Bar” scope=“prototype”>
        <property name=“prop” value=“val” />
    </bean>

    <bean class=“foo.BarCreator”>
        <property name=“blueprintContainer” ref=“blueprintContainer” />
        <property name=“id”>
            <idref component-id=“bar” />
        </property>
    </bean>



    Bar bar = (Bar) blueprintContainer.getComponent(id)


OSGi DevCon, June 22, 2009    Copyright Guillaume Nodet, Licensed under ASL 2.0   54
OSGi Blueprint Services



                             Blueprint events
          • Register listeners
          • Blueprint events
                 –    CREATING
                 –    CREATED
                 –    DESTROYING
                 –    DESTROYED
                 –    FAILURE
                 –    GRACE_PERIOD
                 –    WAITING


    public interface BlueprintListener {
        void blueprintEvent(BlueprintEvent event);
    }




OSGi DevCon, June 22, 2009       Copyright Guillaume Nodet, Licensed under ASL 2.0   55
OSGi Blueprint Services



                               Next steps
          • Custom namespace handlers
          • Config Admin support




OSGi DevCon, June 22, 2009   Copyright Guillaume Nodet, Licensed under ASL 2.0   56
OSGi Blueprint Services



                             Custom namespaces
              <ext:property-placeholder system-properties=“override”>
                 <ext:default-properties>
                     <ext:property name=“name” value=“value” />
                 </ext:default-properties>
              </ext:property>

              <bean ...>
                 <property name=“prop” value=“${name}” />
              </bean>

              <reference interface=“foo.Bar”
                         ext:proxy-method=“classes” />




OSGi DevCon, June 22, 2009      Copyright Guillaume Nodet, Licensed under ASL 2.0   57
OSGi Blueprint Services



                             Config Admin
          • Injection of values from a Configuration



              <cm:property-placeholder persistent-id=“foo.bar” />
                 <cm:default-properties>
                     <cm:property name=“name” value=“value” />
                 </cm:default-properties>
              </cm:property>

              <bean ...>
                 <property name=“prop” value=“${name}” />
              </bean>




OSGi DevCon, June 22, 2009     Copyright Guillaume Nodet, Licensed under ASL 2.0   58
OSGi Blueprint Services



                             Config Admin
          • Support for managed properties




              <bean class=“foo.Bar”>
                 <cm:managed-properties
                      persistent-id=“foo.bar”
                     updated-strategy=“component-managed”
                      update-method=“update” />
              </bean>




OSGi DevCon, June 22, 2009     Copyright Guillaume Nodet, Licensed under ASL 2.0   59
OSGi Blueprint Services



                             Config Admin
          • Support for managed service factories


              <cm:managed-service-factory
                      factory-pid=“foo.bar”
                      interface=“foo.Bar”>
                 <service-properties>
                    <entry key=“key1” value=“value1” />
                 </service-properties>
                 <cm:managed-component class=“foo.BarImpl” />
              </bean>




OSGi DevCon, June 22, 2009     Copyright Guillaume Nodet, Licensed under ASL 2.0   60
OSGi Blueprint Services



                             Implementations
          • Spring-DM (RI)
                 – Based on the Spring Framework
                 – > 2 Mo but provide more features
          • Geronimo blueprint
                 – Clean implementation of Blueprint
                 – Size < 300 Ko
                 – Integrated in Apache Felix Karaf



OSGi DevCon, June 22, 2009     Copyright Guillaume Nodet, Licensed under ASL 2.0   61
OSGi Blueprint Services



                                  Conclusion
          • Existing alternatives
                 – DS, iPojo, Peaberry
          • Strengths of blueprint
                 – Familiarity with Spring
                 – More powerful Dependency Injection
                 – Easily extensible through namespaces


                              gnodet@gmail.com
                 http://svn.apache.org/repos/asf/geronimo/sandbox/blueprint

OSGi DevCon, June 22, 2009       Copyright Guillaume Nodet, Licensed under ASL 2.0   62

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OSGi Blueprint Services

  • 1. OSGi Blueprint Services Blueprint Services DI brought to OSGi Guillaume Nodet
  • 2. OSGi Blueprint Services Author • Guillaume Nodet • ASF Member, VP Apache ServiceMix, PMC member of various Apache projects (ServiceMix, Felix, Geronimo, Mina …) • Software Architect at Progress Software • OSGi Enterprise Expert Group OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 1
  • 3. OSGi Blueprint Services Agenda • Introduction • Configuration • Beans • Service references • Service registrations • Advanced uses • Next steps • Conclusion OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 2
  • 4. OSGi Blueprint Services Introduction • Dependency injection / IOC • Handle legacy code • Handle the OSGi dynamics • Hide the OSGi API OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 3
  • 5. OSGi Blueprint Services Configuration • Extender pattern • XML resources • Metadata Blueprint Bundle Metadata XML Blueprint Extender OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 4
  • 6. OSGi Blueprint Services Blueprint XML definition blueprint ::= <type-converters> manager * manager ::= <bean> | <service> | service-reference service-reference ::= <reference> | <ref-list> type-converter ::= <bean> | <ref> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 5
  • 7. OSGi Blueprint Services Simple example <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”> <service interface=“osgi.devcon.User”> <bean class=“osgi.devcon.impl.UserImpl”> <argument value=“gnodet” /> </bean> </service> </blueprint> bundleContext.registerService( osgi.devcon.User.class.getName(), new osgi.devcon.impl.UserImpl(“gnodet”), new Hashtable()); OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 6
  • 8. OSGi Blueprint Services Simple example <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”> <service interface=“osgi.devcon.User”> <bean class=“osgi.devcon.impl.UserImpl”> <argument value=“gnodet” /> </bean> </service> </blueprint> Top level element bundleContext.registerService( osgi.devcon.User.class.getName(), new osgi.devcon.impl.UserImpl(“gnodet”), new Hashtable()); OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 7
  • 9. OSGi Blueprint Services Simple example <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”> <service interface=“osgi.devcon.User”> <bean class=“osgi.devcon.impl.UserImpl”> <argument value=“gnodet” /> </bean> </service> </blueprint> Blueprint namespace bundleContext.registerService( osgi.devcon.User.class.getName(), new osgi.devcon.impl.UserImpl(“gnodet”), new Hashtable()); OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 8
  • 10. OSGi Blueprint Services Simple example <blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0”> <service interface=“osgi.devcon.User”> <bean class=“osgi.devcon.impl.UserImpl”> <argument value=“gnodet” /> </bean> </service> </blueprint> Manager definition bundleContext.registerService( osgi.devcon.User.class.getName(), new osgi.devcon.impl.UserImpl(“gnodet”), new Hashtable()); OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 9
  • 11. OSGi Blueprint Services Manager types • Bean • Single Service Reference • Multiple Service References • Service Registration OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 10
  • 12. OSGi Blueprint Services Managers • Described by some metadata • Provide objects • Activation / deactivation • Dependencies (implicit or explicit) • Initialization – Eager – Lazy • Id • Inlined managers OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 11
  • 13. OSGi Blueprint Services Bean manager <bean class=“osgi.devcon.impl.UserImpl”> <argument value=”gnodet” /> <property name=“arrival” value=“22/06/09” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 12
  • 14. OSGi Blueprint Services Bean creation • Constructor creation <bean class=“osgi.devcon.impl.UserImpl” /> new osgi.devcon.impl.UserImpl() • Constructor creation with arguments <bean class=“osgi.devcon.impl.UserImpl”> <argument value=“gnodet” /> </bean> new osgi.devcon.impl.UserImpl(“gnodet”) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 13
  • 15. OSGi Blueprint Services Bean creation • Static factory <bean class=“osgi.devcon.impl.UserFactory” factory-method=“createUser”> <argument value=“gnodet” /> </bean> osgi.devcon.impl.UserFactory .createUser( “gnodet”) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 14
  • 16. OSGi Blueprint Services Bean creation • Instance factory <bean factory-ref=“userFactory” factory-method=“createUser”> <argument value=“gnodet” /> </bean> osgi.devcon.impl.UserFactory userFactory = … userFactory.createUser( “gnodet”) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 15
  • 17. OSGi Blueprint Services Bean arguments <argument value=“gnodet”/> <argument ref=“[refid]”/> <argument> [any value] </argument> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 16
  • 18. OSGi Blueprint Services Bean arguments <argument value=“gnodet”/> <argument ref=“[refid]”/> <argument> [any value] </argument> Plain value OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 17
  • 19. OSGi Blueprint Services Bean arguments <argument value=“gnodet”/> <argument ref=“[refid]”/> <argument> [any value] </argument> Reference to a top level manager OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 18
  • 20. OSGi Blueprint Services Bean arguments <argument value=“gnodet”/> <argument ref=“[refid]”/> <argument> [any value] </argument> Complex value OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 19
  • 21. OSGi Blueprint Services Bean properties <bean class=“osgi.devcon.impl.UserImpl”> <property name=“userId” value=“gnodet” /> </bean> UserImpl user = new osgi.devcon.impl.UserImpl(); user.setUserId(“gnodet”); OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 20
  • 22. OSGi Blueprint Services Bean properties <bean class=“osgi.devcon.impl.UserImpl”> <property name=“userId” value=“gnodet” /> </bean> UserImpl user = new osgi.devcon.impl.UserImpl(); user.setUserId(“gnodet”); Property name OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 21
  • 23. OSGi Blueprint Services Bean properties <bean class=“osgi.devcon.impl.UserImpl”> <property name=“userId” value=“gnodet” /> </bean> UserImpl user = new osgi.devcon.impl.UserImpl(); user.setUserId(“gnodet”); Property value OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 22
  • 24. OSGi Blueprint Services Bean properties <property name=“userId” value=“gnodet”/> <property name=“userId” ref=“[refid]”/> <property name=“userId”> [any value] </property> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 23
  • 25. OSGi Blueprint Services Bean scope • Singleton – a single instance will be reused • Prototype – a new instance will be created each time it is injected OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 24
  • 26. OSGi Blueprint Services Values • <null/> • <value> • <bean> • <list> • <reference> • <set> • <ref-list> • <map> • <service> • <array> • <ref> • <props> • <idref> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 25
  • 27. OSGi Blueprint Services <ref /> • Injects an object provided by the manager with the given id <bean id=“regId” … /> <bean class=“osgi.devcon.impl.UserImpl”> <property name=“registration”> <ref component-id=“regId” /> </property> </bean> <bean class=“osgi.devcon.impl.UserImpl”> <property name=“registration” ref=“regId” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 26
  • 28. OSGi Blueprint Services <ref /> • Injects an object provided by the manager with the given id Property value <bean id=“regId” … /> <bean class=“osgi.devcon.impl.UserImpl”> <property name=“registration”> <ref component-id=“regId” /> </property> </bean> <bean class=“osgi.devcon.impl.UserImpl”> <property name=“registration” ref=“regId” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 27
  • 29. OSGi Blueprint Services <idref /> • Injects the id of an existing object <bean id=“regId” … /> <bean class=“osgi.devcon.impl.UserImpl”> <property name=“registrationId”> <idref component-id=“regId” /> </property> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 28
  • 30. OSGi Blueprint Services <value> • Insert the content of the element text <bean class=“osgi.devcon.impl.UserImpl”> <property name=“userId”> <value>gnodet</value> </property> </bean> <bean class=“osgi.devcon.impl.UserImpl”> <property name=“userId” value=“gnodet” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 29
  • 31. OSGi Blueprint Services <list>, <set> and <array> • Inserts a collection of objects <list> <list> <value>2</value> <value>7</value> Arrays.asList( </list> Arrays.asList(“2”,”7”), <list value-type=“int”> Arrays.asList(9,5) <value>9</value> ) <value>5</value> </list> </list> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 30
  • 32. OSGi Blueprint Services <list>, <set> and <array> • Inserts a collection of objects <list> <list> <value>2</value> <value>7</value> Arrays.asList( </list> Arrays.asList(“2”,”7”), <list value-type=“int”> Arrays.asList(9,5) <value>9</value> ) <value>5</value> </list> </list> Type of the values OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 31
  • 33. OSGi Blueprint Services <map> • Inserts a map of objects <map> <entry key="cheese" value="cheddar"/> <entry key="fruit" value="orange"/> </map> <map> <entry key-ref="keyId" value="cheddar"/> <entry key="fruit" value-ref="valueId"/> </map> <map key-type=”...” value-type="... "> <entry ...> </map> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 32
  • 34. OSGi Blueprint Services <map> • Inserts a map of objects <map> <entry> <key> <value type="org.osgi.framework.Version"> 3.2.1 </value> </key> <bean ... /> </entry> </map> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 33
  • 35. OSGi Blueprint Services <props> • Inserts a java.util.Properties object <props> <prop key="1">one</prop> <prop key="2" value="two" /> </props> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 34
  • 36. OSGi Blueprint Services Components as values • Instances provided by managers can be injected <list> <bean class="com.acme.FooImpl"/> </list> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 35
  • 37. OSGi Blueprint Services Service References • Single service: <reference> • Multiple services: <ref-list> <reference id="user1" interface="osgi.devcon.User" filter="(name=gnodet)" /> <ref-list id=”all-users" interface="osgi.devcon.User” /> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 36
  • 38. OSGi Blueprint Services <reference> • Provides a proxy to an OSGi service • Availability: mandatory or optional • Timeout • Damping proxy backing service injected beans services service providers OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 37
  • 39. OSGi Blueprint Services <ref-list> • Provides a read-only and dynamic list of OSGi service • Availability: mandatory or optional backing service list injected beans proxies services service providers OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 38
  • 40. OSGi Blueprint Services Service References Listeners <bean id="listener" ... /> <ref-list interface="osgi.devcon.User"> <reference-listener ref="listener" bind-method="bind" unbind-method="unbind" /> </ref-list> public class Listener { public void bind(User user) { } public void unbind(User user) { } } public void (T) public void (T, Map) public void (ServiceReference) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 39
  • 41. OSGi Blueprint Services Service References Listeners <bean id="listener" ... /> <ref-list interface="osgi.devcon.User"> <reference-listener ref="listener" bind-method="bind" unbind-method="unbind" /> </ref-list> Bind method public class Listener { public void bind(User user) { } public void unbind(User user) { } } public void (T) public void (T, Map) public void (ServiceReference) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 40
  • 42. OSGi Blueprint Services Service registrations • Expose an object as an OSGi service • Register a ServiceFactory • Dependencies on service references <service ref="user" interface="osgi.devcon.User" /> <service auto-export="interfaces"> <bean class="osgi.devcon.impl.UserImpl” /> </service> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 41
  • 43. OSGi Blueprint Services Service properties • Expose an object as an OSGi service <service ref="fooImpl" interface="osgi.devcon.User"> <service-properties> <entry key="name" value="gnodet"/> </service-properties> </service> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 42
  • 44. OSGi Blueprint Services Service Registration Listeners <bean id="listener" ... /> <service ref="..." interface="osgi.devcon.User"> <registration-listener ref="listener" registration-method="register" unregistration-method="unregister" /> </ref-list> public class Listener { public void register(User user, Map props) { } public void unregister(User user, Map props) { } } public void (T, Map) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 43
  • 45. OSGi Blueprint Services Lifecycle OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 44
  • 46. OSGi Blueprint Services Lifecycle Support for lazy activattion OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 45
  • 47. OSGi Blueprint Services Lifecycle Track mandatory references OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 46
  • 48. OSGi Blueprint Services Lifecycle OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 47
  • 49. OSGi Blueprint Services Advanced use • Conversions • Disambiguation • Creating custom converters • Use of <idref> • <ref-list> can be injected as List<ServiceReference> • Use of the ranking attribute on <service> • Blueprint Events OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 48
  • 50. OSGi Blueprint Services Conversions • Arrays, collections, maps • Primitives / wrapped primitives • Simple types with a String constructor • Locale, Pattern, Properties, Class • JDK 5 Generics • Custom converters OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 49
  • 51. OSGi Blueprint Services Disambiguation • Constructors / factory methods can have multiple overloads public class Bar { public Bar(File file) { ... } public Bar(URI uri) { ... } } <bean class="foo.Bar"> <argument type="java.net.URI" value="file://hello.txt"/> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 50
  • 52. OSGi Blueprint Services Custom converters <type-converters> <bean id="converter1" class=”foo.DateTypeConverter"> <property name="format" value="yyyy.MM.dd"/> </bean> </type-converters> <bean class=“...”> <property name=“date” value=“2009.06.22” /> </bean> public class DateTypeConverter { public boolean canConvert(Object fromValue, CollapsedType toType) { ... } public Object convert(Object fromValue, CollapsedType toType) throws Exception { ... } } OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 51
  • 53. OSGi Blueprint Services <ref-list> as List<ServiceReference> <ref-list interface=“osgi.devcon.User” member-type=“service-reference” /> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 52
  • 54. OSGi Blueprint Services Other advanced uses • <ref-list> as List<ServiceReference> <ref-list interface=“osgi.devcon.User” member-type=“service-reference” /> • Use of ranking attribute on <service> <service ref=“foo” interface=“osgi.devcon.User” ranking=“5” /> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 53
  • 55. OSGi Blueprint Services Use of <idref> • Prototypes • Use of the Blueprint API <bean id=“bar” class=“foo.Bar” scope=“prototype”> <property name=“prop” value=“val” /> </bean> <bean class=“foo.BarCreator”> <property name=“blueprintContainer” ref=“blueprintContainer” /> <property name=“id”> <idref component-id=“bar” /> </property> </bean> Bar bar = (Bar) blueprintContainer.getComponent(id) OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 54
  • 56. OSGi Blueprint Services Blueprint events • Register listeners • Blueprint events – CREATING – CREATED – DESTROYING – DESTROYED – FAILURE – GRACE_PERIOD – WAITING public interface BlueprintListener { void blueprintEvent(BlueprintEvent event); } OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 55
  • 57. OSGi Blueprint Services Next steps • Custom namespace handlers • Config Admin support OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 56
  • 58. OSGi Blueprint Services Custom namespaces <ext:property-placeholder system-properties=“override”> <ext:default-properties> <ext:property name=“name” value=“value” /> </ext:default-properties> </ext:property> <bean ...> <property name=“prop” value=“${name}” /> </bean> <reference interface=“foo.Bar” ext:proxy-method=“classes” /> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 57
  • 59. OSGi Blueprint Services Config Admin • Injection of values from a Configuration <cm:property-placeholder persistent-id=“foo.bar” /> <cm:default-properties> <cm:property name=“name” value=“value” /> </cm:default-properties> </cm:property> <bean ...> <property name=“prop” value=“${name}” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 58
  • 60. OSGi Blueprint Services Config Admin • Support for managed properties <bean class=“foo.Bar”> <cm:managed-properties persistent-id=“foo.bar” updated-strategy=“component-managed” update-method=“update” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 59
  • 61. OSGi Blueprint Services Config Admin • Support for managed service factories <cm:managed-service-factory factory-pid=“foo.bar” interface=“foo.Bar”> <service-properties> <entry key=“key1” value=“value1” /> </service-properties> <cm:managed-component class=“foo.BarImpl” /> </bean> OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 60
  • 62. OSGi Blueprint Services Implementations • Spring-DM (RI) – Based on the Spring Framework – > 2 Mo but provide more features • Geronimo blueprint – Clean implementation of Blueprint – Size < 300 Ko – Integrated in Apache Felix Karaf OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 61
  • 63. OSGi Blueprint Services Conclusion • Existing alternatives – DS, iPojo, Peaberry • Strengths of blueprint – Familiarity with Spring – More powerful Dependency Injection – Easily extensible through namespaces gnodet@gmail.com http://svn.apache.org/repos/asf/geronimo/sandbox/blueprint OSGi DevCon, June 22, 2009 Copyright Guillaume Nodet, Licensed under ASL 2.0 62