COPYRIGHT © 2008-2011 OSGi Alliance. All Rights Reserved

Virgo 3.0What's New!

Christopher Frost

SpringSource, a division of VMware

21st September 2011

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Agenda

• Extra Modular with Regions• Virgo 3.0 – What New• Snaps

• Virgo & OSGi Tooling

• Coming Soon• Questions

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Regions – Background

● Module granularity: Class, Bundle, ?● Need higher level scoping construct than a bundle● Simpler management of large applications● [see Subsystems RFC 152 for more background]

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Regions – Scoping in Virgo

● Region scoping - Kernel Space vs User Space● Application scoping

● PARs and scoped Plans● Metadata rewriting for bundle/package scoping● Service registry hooks for service scoping

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Regions – Composite Bundles & Nested Frameworks

• Idea to make a group of bundles like a single bundle

• Explored by OSGi• Prototyped in Equinox• Exploited in Virgo 2.1.x• Difficulty standardising in a framework neutral way

• Spec [RFC 138] replaced by framework hooks

• Equinox prototype deprecated

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Regions – Framework Hooks

• Resolver hook, bundle find/event hooks [see R4.3 core spec for details]

• Similar to service registry find/event hooks which do the same for services

• Control the visibility of bundles, packages, generic capabilities

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Regions – Hook Usability

• Service Find and Event hooks• Bundle Resolver, Find and Event hooks• Hard to ensure consistent behaviour across hooks

• Need higher level abstraction

• Region digraph

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Regions – Region Digraph

• A directed graph of "regions"• A region is a group of bundles• Regions may be connected by directed arcs

• Each directed arc has a filter which controls visibility:• bundles• packages• services• generic capabilities

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Regions – Region Digraph

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Regions – Region Digraph

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Regions – Region Digraph (cont.)

• Developed as part of Virgo• Formal model in Z• Seen to be useful outside Virgo

• Moved to Equinox

• Used by Virgo 3.0• Likely to be used by Apache Aries

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Regions & Subsystems

• OSGi standard multi-bundle scoping mechanism

• Work in progress (Grahams Talk earlier), public draft soon

• Inspired by• Virgo regions & scopes• Apache Aries applications• Apache Felix Karaf features• Newton systems• Eclipse features• Deployment Admin deployment packages

• Virgo likely to implement subsystems in a future release

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Virgo 3.0 – Regions

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Virgo 3.0 – What's new

• Snaps gets its first release

• Servlet 3.0 with Tomcat 7.x

• Gemini.Web, strict compliance to OSGi web container spec

• Jetty version

• Regions have replaced Nested Frameworks

• New Shell based on Apache GoGo

• Updated sample application, Greenpages

• Spring 3.0.5.RELEASE & Equinox Indigo

• Declarative Service & Log Service support

• Lots of Bugfixes etc...

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Virgo 3.0 – Demo

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Snaps – Modular Web Apps

• Some features tidied up• Documentation written• Single sample app showing everything Snaps can do

• All available in a Zip from the Virgo website

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Snaps – Basics

• Lots of Snaps (Web Application Bundles)• Snaps have the hosts ServletContext• Uses a filter to dispatch requests from the host

• Everything else is business as normal

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Snaps – Nested Context Paths

/app/orders /app/billing

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Snaps – A filter for Snaps

• Still just web.xml• Define the subpath for Snaps with a filter

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Snaps – Manifest

• Attaching Snaps to hosts

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Snaps – Taglibs

• JSP tag to look up slices & their properties

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Snaps – Host Properties

• Looking up resources & properties from the host

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Snaps – Demo

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Virgo Tooling

• Donated to Eclipse Virgo and Libra

• Tooling - 1st milestone, lots still changing

• The Dependency on STS/Spring IDE is going

• Bundlor – Manifest generation tool• To have a play, see http://wiki.eclipse.org/Virgo/Tooling

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Virgo Future

• New Web Admin Console• P2 integration• Subsystems

• Tooling

• Cloud• ???

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Questions