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SkyeCORE - Rev Up Your OSGi Services!
- 1. SkyeCORE Rev Up Your OSGi Services!
- 2. What is SkyeCORE? A distributed applications platform. Automates the discovery and publishing of services. Built on top of the Eclipse Platform. Fully supports and exposes OSGi (Equinox).
- 3. Demo Presentation Hello World Service Example Demonstrates the dynamic discovery and invocation of a remote service. Entire example source code available: http://www.skyecore.net/downloads/Hello World Example.zip .
- 4. P2P Network Model Based on JXTA. SkyeCORE Instance ≈ Peer Peers identified via UUID. Publish/Discover Advertisements. Support for Peer Groups (Scoped and Secure Environments).
- 5. Discovery LAN: Multicasting is used. WAN: Controlled propagated search via Rendezvous Peers. LAN 1 Peer A Network Boundary LAN 2 Peer B RDV 1 RDV 2 Peer C Peer D
- 6. Security Encrypted data transfer. Peer Credentials: Used in the authentication of peers and access control. Support for digests and signatures on messages to ensure integrity.
- 7. Works with firewalls and NAT devices. May require a Relay Peer to relay messages for peers behind Firewall/NAT. Firewalls and NAT Relay Z Peer A Peer B Firewall
- 8. Service Interfaces Developed as Java interfaces. Provide a contractual API for service implementations. Declared through Service Interfaces extension point.
- 9. Services Developed as Java objects. Implement 1 or more service interfaces. Abide by a lifecycle (init, destroy). Declared through Services extension point.
- 10. Service Sessions Used to identify a peer across service requests. Store/persist peer information using any type of Java object. Access session ID, creation and last accessed time.
- 11. How’s It Work? Proxies (local and remote) generated from service interfaces. Service Registration (Local): Generation of local proxy Local proxy registered in OSGi service registry. Service Advertisement published.
- 12. How’s It Work? (continued) Service Discovery (Remote): Service Advertisement discovered. Generation of remote proxy Remote proxy registered in OSGi service registry.
- 13. How’s It Work? (continued) Remote Method Invocation: Establish connection via bi-directional pipe. Create and send Service Request (service name, method, serialized args) over pipe. Process request (Service Engine); perform invocation through reflection. Create and send Service Response (return value/exception) over pipe.
- 14. How’s It Work? (continued) What happens when a service becomes unavailable? Remote proxy is unregistered if: Connection fails Service Unavailable Exception Service Advertisement indicates unavailable status.
- 15. How’s It Work? (continued)
- 16. Tracking Services Accomplished via OSGi Service Tracker. Specify 1 or more service interfaces to track with optional filtering. Added, modified, and removed notifications.
- 17. Events Supports notification of several events: Discoveries Published Searches Service Interface and Service Registrations. Register listeners in OSGi Service Registry (“Whiteboard” Pattern)
- 18. Creating an App Based on Eclipse plug-in model. Deploy as plug-ins or features. System bootstrap allows for complete application control and launching of a custom UI.
- 19. Console Provides a text-based command UI. Core commands used to list services, interfaces, discoveries, etc. Extended with custom commands via Commands extension point.
- 20. Road Map SkyeCORE 2.0 slated for October 2009 release. Streaming capability. Enhanced security. Subscriber model (propagation of custom events). SIE (SkyeCORE Interface Environment) graphical UI based on Eclipse workbench. User desired features!
- 21. Distributed OSGi RFC 119 Built around the OSGi service model. Distribution software and Discovery service components. Interoperability with other technologies. Enable a service to be remote via setting of property.
- 22. Resources SkyeCORE - http://www.skyecore.net Developer’s Guide, API JavaDocs, Downloads, Hello World Example Source, SDK, Forum, Feedback JXTA - https://jxta.dev.java.net OSGi 4.2 Early Draft: http://www.osgi.org/download/osgi-4.2-early-draft.pdf
- 23. Questions?
- 24. Thank You! Wayne Williams [email_address]