Help me obr you are my only hope - osgi users forum uk 16-nov2011

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Presentation by David Savage at UK OSGi Users' Forum UK on Nov 16, 2011 in London. Abstract: The OSGi Bundle Repository (OBR) is an upcoming specification that defines a unified way of resolving and accessing bundles to be deployed into an OSGi framework. This talk will explain its origins, history, relationship to the latest framework enhancements, and its various roles and responsibilities. We will conclude with a look at how it relates to other services and possible future extensions.

Technology News & Politics

Help Me OBR, You’re My Only Hope
David Savage
david.savage@paremus.com
Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Help Me OBR,You’re
My Only Hope
A Brief Introduction To The OSGi Bundle Repository

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

A Long Time Ago...

• OSGi Bundle Repository
• Motivation, History
• Main Aspects
• Beneﬁts, Impact on Ecosystem

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Common OSGi Pain
Points

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Dependency Management:
• Development
• Deployment
• Runtime
• Which bundles to install when, why, how
Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

The Story So Far...

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Informally speciﬁed & implemented by
Richard Hall ~2004, add-on to Felix

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Various problems:
• Provisioning external runtimes
• Distinction between development/
runtime

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Others:
• P2
• Nimble
• Sigil
• Maven
• Ivy
Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Ofﬁcial OBR revived in 2009 by Hal
Hildebrand

• Spec'd by David Savage in EEG

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

The Problem

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

OBR Is...

• Primarily a standardised Model to describe:
• Which Bundles are available?
• What do they do?

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

OBR Is Not...

• A management agent/deployer:
• “calculator only”
• A “server” or “database”:
• no deﬁned protocol

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Main Aspects

• Repository
• Resolver
• Interchange Format

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

A New Model

• Uses 4.3 concept of "wiring"
• Implements often requested functionality
for introspection

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Environment

<<contains>>

<<expressed by>> <<provides>>
Resource

BundleRevision

<<connected by>> <<connected to>>
Requirement Capability

BundleRequirement Wire BundleCapability

BundleWire

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Resources can be
physical or virtual

• Resources have
Capability Requirement

Requirements and
Capabilities

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• Capabilities have a
namespace and a
map of attributes
Capability Requirement

• Requirements have
a namespace and a
set of directives

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

• A Requirement
matches a Capability
if the namespaces
are equal and the
directives match the
attributes

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Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Common Namespaces
• Capabilities:
• osgi.identity → Unique per resource
• osgi.content → Checksums, SCM, etc
• Requirements:
• osgi.wiring.package → Import-Package
• osgi.wiring.bundle → Require-Bundle
Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Repository

• Repository: simple
service(s) that
provide resources
with capabilities

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Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Resolution

• Resources + Wiring A
B

C
D

= Environment
• Environment +
Requirements = D B

Resolution C A

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

An Example
osgi.service=servlet.container
effective=active
Active
Servlet
Servlet
Bundle
Container

Servlet
Container
Provider

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Subsystems

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Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Interchange Format

• Based on XML Schema
• Human-readable Name & URI for
repository identity
• Version increment (long)
• Resource URLs, Size, Checksums..
Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

<?xml version=”1.0”?>
<repository name=”example” increment=”1”
targetNamespace=”http://www.osgi.org/xmlns/obr/v1.0.0”>
<resource>
<capability namespace=”osgi.identity”>
<attribute name=”osgi.identity” value=”org.foo.mumble” />
<attribute name=”version” type=”version” value=”1.0.0” />
<attribute name=”type” value=”osgi.bundle” />
</capability>
<capability namespace=”osgi.content”>
<attribute name=”osgi.content” value=”org/foo/
org.foo.mumble-1.0.0.jar” />
<attribute name=”size” type=”long” value=”46725” />
<attribute name=”checksum”
value=”1bafd2ece2e88db4cdf835a7f8f0de65fab5b1147977a5dcc59b7c1b8
c6f5080” />
</capability>
</resource>
</repository>

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Leftovers

• Limited resolution failure introspection
• Repository event model
• License handling
• Web based service
• Deployment model → Subsystems
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Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Conclusion

• OBR:
• Small, robust, reliable
• Fixes Things Automatically
• Gets The Job Done!

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

Questions?
• Email: david.savage@paremus.com

• Twitter: @davemssavage

• Blog: http://chronological-
thought.blogspot.com

• Book: http://www.manning.com/hall/

• Paremus: http://www.paremus.com

• OSGi: http://www.osgi.org

Help Me OBR,You’re My Only Hope www.paremus.com November 2011
Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

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1. Help Me OBR, You’re My Only Hope David Savage david.savage@paremus.com Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

2. Help Me OBR,You’re My Only Hope A Brief Introduction To The OSGi Bundle Repository Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

3. A Long Time Ago... • OSGi Bundle Repository • Motivation, History • Main Aspects • Beneﬁts, Impact on Ecosystem Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

4. Common OSGi Pain Points Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

6. • Dependency Management: • Development • Deployment • Runtime • Which bundles to install when, why, how Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

8. • Informally speciﬁed & implemented by Richard Hall ~2004, add-on to Felix Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

9. • Various problems: • Provisioning external runtimes • Distinction between development/ runtime Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

10. • Others: • P2 • Nimble • Sigil • Maven • Ivy Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

11. • Ofﬁcial OBR revived in 2009 by Hal Hildebrand • Spec'd by David Savage in EEG Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

13. OBR Is... • Primarily a standardised Model to describe: • Which Bundles are available? • What do they do? Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

14. OBR Is Not... • A management agent/deployer: • “calculator only” • A “server” or “database”: • no deﬁned protocol Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

15. Main Aspects • Repository • Resolver • Interchange Format Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

16. A New Model • Uses 4.3 concept of "wiring" • Implements often requested functionality for introspection Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

17. Environment <<contains>> <<expressed by>> <<provides>> Resource BundleRevision <<connected by>> <<connected to>> Requirement Capability BundleRequirement Wire BundleCapability BundleWire Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

18. • Resources can be physical or virtual • Resources have Capability Requirement Requirements and Capabilities Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

19. • Capabilities have a namespace and a map of attributes Capability Requirement • Requirements have a namespace and a set of directives Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

20. • A Requirement matches a Capability if the namespaces are equal and the directives match the attributes Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

21. Common Namespaces • Capabilities: • osgi.identity → Unique per resource • osgi.content → Checksums, SCM, etc • Requirements: • osgi.wiring.package → Import-Package • osgi.wiring.bundle → Require-Bundle Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

22. Repository • Repository: simple service(s) that provide resources with capabilities Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

23. Resolution • Resources + Wiring A B C D = Environment • Environment + Requirements = D B Resolution C A Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

24. An Example osgi.service=servlet.container effective=active Active Servlet Servlet Bundle Container Servlet Container Provider Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

26. Interchange Format • Based on XML Schema • Human-readable Name & URI for repository identity • Version increment (long) • Resource URLs, Size, Checksums.. Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

27. <?xml version=”1.0”?> <repository name=”example” increment=”1” targetNamespace=”http://www.osgi.org/xmlns/obr/v1.0.0”> <resource> <capability namespace=”osgi.identity”> <attribute name=”osgi.identity” value=”org.foo.mumble” /> <attribute name=”version” type=”version” value=”1.0.0” /> <attribute name=”type” value=”osgi.bundle” /> </capability> <capability namespace=”osgi.content”> <attribute name=”osgi.content” value=”org/foo/ org.foo.mumble-1.0.0.jar” /> <attribute name=”size” type=”long” value=”46725” /> <attribute name=”checksum” value=”1bafd2ece2e88db4cdf835a7f8f0de65fab5b1147977a5dcc59b7c1b8 c6f5080” /> </capability> </resource> </repository> Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

28. Leftovers • Limited resolution failure introspection • Repository event model • License handling • Web based service • Deployment model → Subsystems Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

29. Conclusion • OBR: • Small, robust, reliable • Fixes Things Automatically • Gets The Job Done! Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

30. Questions? • Email: david.savage@paremus.com • Twitter: @davemssavage • Blog: http://chronological- thought.blogspot.com • Book: http://www.manning.com/hall/ • Paremus: http://www.paremus.com • OSGi: http://www.osgi.org Help Me OBR,You’re My Only Hope www.paremus.com November 2011 Copyright © 2011 Paremus Ltd. May not be reproduced by any means without express permission. All rights reserved.

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