ITS TIME FOR THE RESOLUTION TIM VERBELEN Senior Researcher imec - - PowerPoint PPT Presentation

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ITS TIME FOR THE RESOLUTION TIM VERBELEN Senior Researcher imec - - PowerPoint PPT Presentation

Oct 28, 2023 789 likes •1.13k views

ITS TIME FOR THE RESOLUTION TIM VERBELEN Senior Researcher imec Ghent University 1 PUBLIC ! could not resolve the bundles: [ that.awesome.library.i.found -1.0.0 org.osgi.framework.BundleException: Unable to resolve

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IT’S TIME FOR THE RESOLUTION

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TIM VERBELEN

Senior Researcher imec – Ghent University

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! could not resolve the bundles: [that.awesome.library.i.found-1.0.0

  • rg.osgi.framework.BundleException: Unable to resolve

that.awesome.library.i.found [1](R 1.0): missing requirement [that.awesome.library.i.found [1](R 1.0)]

  • sgi.wiring.package;

(&(osgi.wiring.package=some.exotic.package)(version>=1.0.0) (!(version>=2.0.0))) Unresolved requirements: [[that.awesome.library.i.found [1](R 1.0)] osgi.wiring.package; (&(osgi.wiring.package=some.exotic.package)(version>=1.0.0) (!(version>=2.0.0)))]]

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WHEN DO YOU RESOLVE?

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WHEN DO YOU RESOLVE?

AT RUNTIME?

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WHEN DO YOU RESOLVE?

AT RUNTIME? AT LAUNCH TIME?

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WHEN DO YOU RESOLVE?

AT RUNTIME? AT LAUNCH TIME? AT DEVELOPMENT TIME?

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OSGI BUNDLES AND PACKAGES

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RESOLVING IMPORT

  • PACKAGES

foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.impl Export-Package Private-Package Import-Package foo.bar.util; version=[1.0.0, 1.1.0)

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OSGI BUNDLES AND PACKAGES

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RESOLVING IMPORT

  • PACKAGES

foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.impl Export-Package Private-Package Import-Package foo.bar.util; version=[1.0.0, 1.1.0)

OSGi framework

install

Resolver

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OSGI BUNDLES AND PACKAGES

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RESOLVING IMPORT

  • PACKAGES

foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.impl Export-Package Private-Package Import-Package foo.bar.util; version=[1.0.0, 1.1.0) install

foo.bar.util v1.0.0

foo.bar.util; version=1.0.0 Export-Package

OSGi framework Resolver

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RESOLVING AGAINST A REPOSITORY

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foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.util; version=[1.0.0, 1.1.0)

foo.bar.util v2.0.0

foo.bar.util; version=2.0.0

com.car v1.0.0

com.car.api; version=1.0.0

Repository …

Resolver resolve foo.bar v1.0.0 foo.bar.util v1.0.0

foo.bar.util; version=1.0.0

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RESOLVING AGAINST A REPOSITORY

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foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.util; version=[1.0.0, 1.1.0)

foo.bar.util v2.0.0

foo.bar.util; version=2.0.0

com.car v1.0.0

com.car.api; version=1.0.0

Repository …

Resolver resolve foo.bar v1.0.0 foo.bar.util v1.0.0

foo.bar.util; version=1.0.0

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RESOLVING PACKAGES

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OSGI EXTENDERS

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DO STUFF ON BEHALF OF ANOTHER BUNDLE

foo.bar v1.0.0 OSGi framework

install

Resolver felix.scr

Service-Component: OSGI-INF/foo.bar.BarImpl.xml

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OSGI EXTENDERS

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DO STUFF ON BEHALF OF ANOTHER BUNDLE

foo.bar v1.0.0 OSGi framework

install

Resolver felix.configurator

OSGI-INF/configurator/config.json

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REQUIREMENTS AND CAPABILITIES

▪ Something the bundle needs

▪ Namespace ▪ Directives (i.e. a filter)

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▪ Something the bundle offers

▪ Namespace ▪ Attributes (i.e. key-value pairs)

Requirement Capability

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REQUIREMENTS AND CAPABILITIES

▪ Something the bundle needs

▪ Namespace ▪ Directives (i.e. a filter)

  • sgi.wiring.package;

filter:=“(&(osgi.wiring.package=foo.bar.util)(ve rsion>=1.0.0)(!(version>=2.0.0)))”

  • sgi.extender;

filter:=“(&(osgi.extender=osgi.component)(ve rsion>=1.4.0)(!(version>=2.0.0)))”

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▪ Something the bundle offers

▪ Namespace ▪ Attributes (i.e. key-value pairs)

  • sgi.wiring.package;
  • sgi.wiring.package=“foo.bar.util”

version=“1.0.0”

  • sgi.extender;
  • sgi.extender=“osgi.component”

Requirement Capability

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RESOLVING CAPABILITIES AND REQUIREMENTS

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OSGI SERVICES

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REQUIRE AN OSGI SERVICE

foo.bar.api v1.0.0

foo.bar.api; version=1.0.0

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OSGI SERVICES

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REQUIRE AN OSGI SERVICE

foo.bar.api v1.0.0 foo.bar.impl v1.0.0

foo.bar.api; version=1.0.0 import foo.bar.api.BarService

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OSGI SERVICES

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REQUIRE AN OSGI SERVICE

foo.bar.api v1.0.0 foo.bar.impl v1.0.0 foo.bar.consumer v1.0.0

foo.bar.api; version=1.0.0 import foo.bar.api.BarService import

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OSGI SERVICES

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REQUIRE AN OSGI SERVICE

foo.bar.api v1.0.0 foo.bar.impl v1.0.0 foo.bar.consumer v1.0.0

foo.bar.api; version=1.0.0 import foo.bar.api.BarService import

Provide-Capability

  • sgi.service;
  • bjectClass:List<String>=“foo.bar.api.BarService"

Require-Capability

  • sgi.service;

filter:="(objectClass=foo.bar.api.BarService)"; effective:=active

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OSGI SERVICES

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REQUIRE AN OSGI SERVICE

foo.bar.api v1.0.0 foo.bar.impl v1.0.0 foo.bar.consumer v1.0.0

foo.bar.api; version=1.0.0 import foo.bar.api.BarService import

Provide-Capability

  • sgi.service;
  • bjectClass:List<String>=“foo.bar.api.BarService"

Require-Capability

  • sgi.service;

filter:="(objectClass=foo.bar.api.BarService)"; effective:=active

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RESOLVING SERVICES

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DECLARING REQUIREMENTS AND CAPABILITIES

@Capability(namespace=“your.name.space”, name=“foo”, version=“1.0.0”) @Requirement(namespace=“your.name.space”, filter=“(name=foo)”) USE BUNDLE ANNOTATIONS

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DECLARING REQUIREMENTS AND CAPABILITIES WITH BUNDLE ANNOTATIONS

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SO WHAT ABOUT INSTALLING AT RUNTIME?

USE THE REPOSITORY AND RESOLVER SERVICES

OSGi framework Resolver

Resolver

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SO WHAT ABOUT INSTALLING AT RUNTIME?

USE THE REPOSITORY AND RESOLVER SERVICES

OSGi framework Resolver foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.util; version=[1.0.0, 1.1.0)

foo.bar.util v2.0.0

foo.bar.util; version=2.0.0

com.car v1.0.0

com.car.api; version=1.0.0

Repository …

foo.bar.util v1.0.0

foo.bar.util; version=1.0.0 Resolver Repository

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SO WHAT ABOUT INSTALLING AT RUNTIME?

USE THE REPOSITORY AND RESOLVER SERVICES

OSGi framework Resolver foo.bar v1.0.0

foo.bar.api; version=1.0.0 foo.bar.util; version=[1.0.0, 1.1.0)

foo.bar.util v2.0.0

foo.bar.util; version=2.0.0

com.car v1.0.0

com.car.api; version=1.0.0

Repository …

foo.bar.util v1.0.0

foo.bar.util; version=1.0.0

Deployment Agent

Resolver Repository

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RESOLVER SERVICE

▪ Resolver Map<Resource, List<Wire>> resolve(ResolveContext context) throws ResolutionException ▪ ResolveContext Collection<Resource> getMandatoryResources() what to resolve? List<Capability> findProviders(Requirement requirement) where to find capabilities to resolve it?

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RESOLVING AT RUNTIME

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CONCLUSION

▪ Resolving is a gain, not a pain ▪ Resolve early and often ▪ Curate your repositories ▪ Use the (BND) tooling

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