OSGi Blueprint Services
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  • 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