Weld-OSGi in Action

Slides from the Devoxx 2012 'Tools in Action'
The demo code can be found here :

https://github.com/mathieuancelin/demo-devoxx2012

Transcript

2. Weld-OSGi in Action Mathieu ANCELIN @TrevorReznik Matthieu CLOCHARD @arcane86
3. Speakers • Mathieu ANCELIN • Developer @ SERLI • Poitou-Charentes JUG • JSR-346 EG member • @TrevorReznik • Matthieu CLOCHARD • Developer @ SERLI • Poitou-Charentes JUG • @arcane86
4. SERLI • IT company based in France • 65 people • 80% of business Java related • Contribute to open-source projects • 10% of work force on OSS • JSR-346 EG member • OSGi Alliance member • www.serli.com @SerliFr 4
5. SERLI • IT company based in France • 65 people • 80% of business Java related • Contribute to open-source projects • 10% of work force on OSS • JSR-346 EG member • OSGi Alliance member • www.serli.com @SerliFr 4
6. Before we start #devoxx #weldosgi
7. CDI
8. CDI @Inject @Named @Qualifier @Scope @ApplicationScoped @SessionScoped @RequestScoped @Observes @Any @Default @Dispose @Model @Stereotype @New @Produces @Typed
9. CDI @Inject @Named @Qualifier @Scope @ApplicationScoped @SessionScoped @RequestScoped @Observes @Any @Default @Dispose @Model @Stereotype @New @Produces @Typed
10. • An amazing modular and dynamic platform for Java • Very stable and powerful but old APIs 8 Module Lifecycle Service Java environment Bundles OSGi
11. Modules / Bundles 9
12. Modules / Bundles 9 manifest manifest
13. Modules / Bundles 9 manifest manifest Bundle-SymbolicName: com.foo.bar Bundle-SymbolicName: com.sample.app
14. Modules / Bundles 9 manifest manifest Bundle-SymbolicName: com.foo.bar Bundle-SymbolicName: com.sample.app Export-Package: com.sample.app.api; version=1.2.0
15. Modules / Bundles 9 manifest manifest Bundle-SymbolicName: com.foo.bar Bundle-SymbolicName: com.sample.app Export-Package: com.sample.app.api; version=1.2.0 Import-Package: com.sample.app.api; version=[1.2.0-2.0.0)
16. Modules / Bundles 9 manifest manifest Bundle-SymbolicName: com.foo.bar Bundle-SymbolicName: com.sample.app Export-Package: com.sample.app.api; version=1.2.0 Import-Package: com.sample.app.api; version=[1.2.0-2.0.0)
17. Lifecycle 10 Installed Resolved Uninstalled Starting Active Stopping install update refresh stop start update refresh resolve uninstall uninstall
18. Services 11 OSGI service registry Bundle A Bundle B listener
19. Services 11 OSGI service registry Bundle A Bundle B listener register
20. Services 11 OSGI service registry Bundle A Bundle B listener register lookup
21. Services 11 OSGI service registry Bundle A Bundle B listener register
22. Services 11 OSGI service registry Bundle A Bundle B listener register notify
23. Services 11 OSGI service registry Bundle A Bundle B listener register notify lookup
24. Weld-OSGi • (try to be) the best of both worlds • dynamic, typesafe, annotations, etc ... • CDI extension to use CDI programming model inside OSGi • A JBoss Weld project • need to bootstrap Weld in an OSGi environment • Developed by SERLI R&D team • Mathieu & Matthieu • You don’t need to know OSGi • make the OSGi programming model disappear => CDI • but still compatible
25. How does it work 13 Java Platform OSGi Platform
26. How does it work 13 Java Platform OSGi Platform Weld- OSGi
27. How does it work 13 Java Platform OSGi Platform Weld- OSGi bundle 1 bundle2 bundle3
28. How does it work 13 Java Platform OSGi Platform Weld- OSGi bundle 1 bundle2 bundle3 beans .xml
29. How does it work 13 Java Platform OSGi Platform Weld- OSGi bundle 1 bundle2 bundle3 beans .xml beans .xml
30. How does it work 13 Java Platform OSGi Platform Weld- OSGi bundle 1 bundle2 bundle3 beans .xml beans .xml
31. How does it work 13 Java Platform OSGi Platform Weld- OSGi bundle 1 bundle2 bundle3 beans .xml beans .xml
32. How does it work 13 Java Platform OSGi Platform Weld- OSGi bundle 1 bundle2 bundle3 beans .xml beans .xml
34. Nevernote
35. Demo
36. Services publication
37. Services publication @Publish @ApplicationScoped @Lang(EN) public class TweetPlugin implements Plugin { }
38. Services publication @Inject Instance<TweetPlugin> instance; @Inject ServiceRegistry registry; MyService service = instance.get(); Registration<TweetPlugin> reg = registry.register(service); ... reg.unregister(); @Publish @ApplicationScoped @Lang(EN) public class TweetPlugin implements Plugin { }
39. Service injection @Inject @OSGiService Plugin plugin; plugin.doSomething(); // fail if no services available
40. Services injection / whiteboard
41. Services injection / whiteboard @Inject Service<Plugin> services; for (MyService actualService : services.first()) { actualService.doSomething(); // called 0-1 service } for (MyService actualService : services) { actualService.doSomething(); // called 0-n service(s) }
42. Services injection / whiteboard @Inject Service<Plugin> services; for (MyService actualService : services.first()) { actualService.doSomething(); // called 0-1 service } for (MyService actualService : services) { actualService.doSomething(); // called 0-n service(s) } services.get().doSomething(); // can fail, not dynamic services.size(); services.isUnsatisfied(); services.isAmbiguous();
43. Filtering @Publish @Lang(EN) @Country(US) public class TweetPlugin implements Plugin { ... } @Inject @OSGiService @Filter("(&(lang=*)(country=US))") Plugin service;
44. Filtering @Publish @Lang(EN) @Country(US) public class TweetPlugin implements Plugin { ... } @Inject @Filter("(&(lang=*)(country=US))") Service<Plugin> services;
45. Filtering @Publish @Lang(EN) @Country(US) public class TweetPlugin implements Plugin { ... } @Inject @Filter("(&(lang=*)(country=US))") Service<Plugin> services; @Inject @OSGiService @Lang(EN) @Country(US) Plugin service;
46. Filtering @Publish @Lang(EN) @Country(US) public class TweetPlugin implements Plugin { ... } @Inject @Filter("(&(lang=*)(country=US))") Service<Plugin> services; @Inject @Lang(EN) @Country(US) Service<Plugin> services;
47. Demo
48. OSGi events • OSGi generates a lot of events to let you interact with bundle and service layers • Easier to handle dynamism with • bundle events • service events
49. Bundle events • Available events • BundleInstalled • BundleResolved • BundleStarting • BundleStarted • BundleStopping • BundleStopped • BundleUninstalled • BundleUpdated • BundleUnresolved Installed Resolved Uninstalled Starting Active Stopping install update refresh stop start update refresh resolve uninstall uninstall
50. Bundle events public void bindBundle(@Observes BundleInstalled evt) {}
51. Bundle events public void bindBundle(@Observes @BundleName("com.foo.bar") BundleInstalled evt) {}
52. Bundle events public void bindBundle(@Observes @BundleVersion("1.2.3") BundleInstalled evt) {}
53. Bundle events public void bindBundle(@Observes @BundleName("com.foo.bar") @BundleVersion("1.2.3") BundleInstalled evt) {}
54. Services events void bindService(@Observes ServiceArrival evt) {} • Available events • ServiceArrival • ServiceDeparture • ServiceChanged
55. Services events void bindService(@Observes @Specification(Plugin.class) ServiceArrival evt) {} • Available events • ServiceArrival • ServiceDeparture • ServiceChanged
56. Services events void bindService(@Observes @Filter("(lang=US)") ServiceArrival evt) {} • Available events • ServiceArrival • ServiceDeparture • ServiceChanged
57. Services events void bindService(@Observes @Specification(Plugin.class) @Filter("(lang=US)") ServiceArrival evt) {} • Available events • ServiceArrival • ServiceDeparture • ServiceChanged
58. Inter-bundle events • Communication between bundles (managed by Weld-OSGi) with standard CDI events Bundle A Bundle C Bundle B Weld-OSGi
59. Inter-bundle events • Communication between bundles (managed by Weld-OSGi) with standard CDI events Bundle A Bundle C Bundle B Weld-OSGi fire()
60. Inter-bundle events • Communication between bundles (managed by Weld-OSGi) with standard CDI events Bundle A Bundle C Bundle B Weld-OSGi fire() broadcast() broadcast()
61. Inter-bundle events @Inject Event<InterBundleEvent> event; event.fire(new InterBundleEvent("Hello bundles"));
62. Inter-bundle events @Inject Event<InterBundleEvent> event; event.fire(new InterBundleEvent("Hello bundles")); public void listen(@Observes InterBundleEvent event) {}
63. Inter-bundle events @Inject Event<InterBundleEvent> event; event.fire(new InterBundleEvent("Hello bundles")); public void listen(@Observes @Specification(String.class) InterBundleEvent event) {}
64. Inter-bundle events @Inject Event<InterBundleEvent> event; event.fire(new InterBundleEvent("Hello bundles")); public void listen(@Observes @Sent InterBundleEvent event) {}
65. Inter-bundle events @Inject Event<InterBundleEvent> event; event.fire(new InterBundleEvent("Hello bundles")); public void listen(@Observes @Specification(String.class) @Sent InterBundleEvent event) {}
66. Demo
67. @Inject Bundle bundle; @Inject BundleContext context; @Inject @BundleHeaders Map<String, String> headers; @Inject @BundleHeader("Bundle-SymbolicName") String symbolicName; @Inject @BundleDataFile("text.txt") File text; OSGi utilities
68. If you want to give it a try • Get Weld-OSGi (https://github.com/weld/core) • Write an OSGi bundle • Maven module + maven-bundle-plugin • Empty beans.xml file in META-INF !!! <dependency> <groupId>org.jboss.weld.osgi</groupId> <artifactId>weld-osgi-core-api</artifactId> <version>1.2.0.Beta1</version> </dependency> <dependency> <groupId>javax.enterprise</groupId> <artifactId>cdi-api</artifactId> <version>1.0-SP4</version> </dependency> https://github.com/mathieuancelin/demo-devoxx2012
69. The future • CDI Extension for hybrid Java EE app servers • using Weld-OSGi in Java EE apps • Java EE apps talking to each other through OSGi services • Java EE apps talking to OSGi bundles • work in progress (works on JBoss AS) ;-) • Integration with OSGi enterprise specs • CDI/OSGi => RFC 146 • Inspired by Weld-OSGi
70. Conclusion • Weld-OSGi is cool • You should try it ;-) • Can help to change people’s mind about OSGi • Adaptative programming • Dynamic • Modularity • Don’t hesitate to give us feedback and fill issues
71. Thanks