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Similaire à OSGi Remote Services - Alexander Broekhuis, Bram de Kruijff
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OSGi Remote Services - Alexander Broekhuis, Bram de Kruijff
- 1. OSGi Remote Services Alexander Broekhuis alexander.broekhuis@luminis.eu Bram de Kruijff bram.dekruijff@luminis.eu
- 2. Agenda • OSGi specificaCon • Remote Service Admin SpecificaCon • In a Java world... • ... and in a NaCve world • ImplementaCon • Amdatu • Celix • Interoperability
- 3. OSGi SpecificaCons • SpecificaCons • Core • Compendium • Enterprise ! • NaCve-‐OSGi • RFP-‐156
- 6. • Endpoint Listener – A listener service that receives updates of Endpoints that match its scope Endpoint Listener is used symmetrically to implement a federated registry. The Topology Manager can use it to notify interested parties about created and removed Endpoints, as we receive notifications from other parties, potentially remote, about their available Endpoint • Remote Service Admin Listener – A listener service that is informed of all the primitive action the Remote Service Admin performs like importing and exporting as well as errors. • Endpoint Configuration Extender – A bundle that can detect configuration data describing an point Description in a bundle resource, using the extender pattern. • Discovery – An Endpoint Listener that detects the Endpoint Descriptions through some dis protocol. • Cluster – A group of computing systems that closely work together, usually in a fast netwo Remote Service Admin • Remote Service (Admin) • Enterprise SpecificaCon -‐ chapter 100 • Enterprise SpecificaCon -‐ chapter 122 Remote Service Admin Entities Figure 122.1 ! Client impl discovered by XML ! ! ! ! ! Imported & Exported Services Endpoint Listener discovers Topology Manager Impl Remote Service Admin Listener Remote Service Admin Impl Discovery Impl announces Remote Service Admin Endpoint Listener 1 0..n 1 0..n to an Endpoint discovers/ announces network/ cluster configured Endpoint
- 7. Remote Service Admin • Topology Manager • Detect exported / imported services • Detect service interests ! • Remote Service Admin • Export / import services • Endpoint creaCon through the use of Endpoint properCes
- 8. 122.6 Discovery Discovery The topology of the distributed system is decided by the Topology Manager. However, in a distrib uted environment, the Topology Manager needs to discover Endpoints in other frameworks. There very large number of ways how a Topology Manager could learn about other Endpoints, ranging from static configuration, a centralized administration, all the way to fully dynamic discovery pro cols like the Service Location Protocol (SLP) or JGroups. To support the required flexibility, this sp ification defines an Endpoint Listener service that allows the dissemination of Endpoint informatio This service provides a symmetric solution because the problem is symmetric: it is used by a Topo ogy Manager to announce changes in its local topology as well as find out about other Endpoint Descriptions. Where those other Endpoint Descriptions come from can vary widely. This design i depicted in Figure 122.5 on page 315. • Publish endpoints • Discover endpoints • Scoping Figure 122.5 Topology Information Dissemination Examples ! Static Configuration Managed Service Factory ! ! ! ! Endpoint Listener Topology Manager Configuration Extender extends Network Discovery discovers/ announces discovers announces Endpoint Listener Topology Map displays networks display
- 9. Remote Services «service» Server imported = "true" Server «service» Server remote = "true" ServerStub Client ServerProxy Registry «track» Proxy Publisher Remote Publisher Stubs «service» Discovery Service «service» Discovery Service Proxies
- 10. Use cases • Research Projects • STARS/INAETICS • (Re)Configurable dynamic systems • Machine 2 Machine • Heterogeneous systems • Home automaCon
- 11. Java ImplementaCons • Apache CXF DOSGi • Transport: JAX-‐WS and JAX-‐RS • Discovery: Zookeeper • Eclipse CF • Modular soluCon • Amdatu Remote Services • Transport: HTTP + JSON, HTTP + Java SerialisaCon • Discovery: SLP, MulCcastDNS, Hazelcast • Growing project: open for more protocols
- 12. NaCve ImplementaCons • Apache Celix • Transport: HTTP + JSON • Discovery: MulCcastDNS, SLP • Service Oriented Framework (SOF) • Corba based Remote Registry
- 13. Amdatu/Celix Remote Services • HTTP/JSON • HTTP is well known and supported in all languages • JSON is simple and lightweight • MulCcastDNS • Supported on many pladorms/languages • Interoperability • From C to Java and vice versa • Todo • Generate C code for endpoints
- 14. Demo -‐ Calculator • Calculator shell commands • add / sub / sqrt public interface public double public double public double } Calculator { add(double a, double b); sub(double a, double b); sqrt(double a); struct calculator_service { calculator_pt example; celix_status_t (*add)(calculator_pt example, double a, double b, double *result); celix_status_t (*sub)(calculator_pt example, double a, double b, double *result); celix_status_t (*sqrt)(calculator_pt example, double a, double *result); };
- 15. Thank you • OSGi • hfp://www.osgi.org • Amdatu Remote Services • hfps://bitbucket.org/amdatu/ amdatu-‐remoteservices • Apache Celix • hfp://incubator.apache.org/ celix/ ! ! ! • Dynamic Hybrid Cloud ApplicaCons • Wednesday: 14:30 -‐ 15:05 • Schubartsaal • ConCnuous Automated Deployment with Apache ACE • Thursday: 11:15 -‐ 11.50 • Schubartsaal ! ! ! !