OSGi Blueprint Services

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

by Guillaume Nodet

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