OSGi Users' Forum UK - OSGi Release 4 v4.2 Spec Overview - Peter Kriens

OSGi Next

Peter KriensOSGi Evangelist

dinsdag 14 juli 2009

OSGi Service PlatformCore Specification

Planning 4.2

• Core released for approval June 10

• Working on the final draft for Compendium as we speak

• Compendium : July 10

• Enterprise Release Autumn

• Residential Release Spring 2010

Legend

BundleA

BundleB

Legend

BundleA

BundleB

Service

Legend

BundleA

BundleB

Service

getService

registerService

Legend

BundleA

BundleB

Service

getService

BundleC

registerService

Legend

BundleA

BundleB

Service

getService

BundleC

registerService

addServiceListener

Legend

BundleA

BundleB

Service

getService

BundleC

registerService

Call/DependencyDirection addServiceListener

• Launching

• Bundle Tracker

• Bundle-License Header

• Service Hooks

• Negative Permissions

Launching

• To be inside a framework …

• Or outside a framework ...

• That’s the question!

Launching

• Standardizes launching different frameworks

• Will enable generic launchers

• Allows you to embed a framework in your application!

LaunchingMap<String,String> p = new HashMap<String,String>();

List<String> impls = getMetaInfServices(

loader, FrameworkFactory.class.getName());

if (impls.size() != 1) throw new RuntimeException( "Too many frameworks: "+ impls);

Class<?> clazz = loader.loadClass(impls.get(0)); FrameworkFactory factory = (FrameworkFactory) clazz .newInstance(); Framework fw = factory.newFramework(p); Bundle b = fw.installBundle( “http://.../load/…”); b.start();

Bundle Tracker

• Simple tool a la Service Tracker to track bundles

• Very useful for extenders

• Bundles that provide additional functionality based on data in a bundle

• Tracks a set of states

• Handles all concurrency issues

Service Hooks

• FindHook

• Intercept getServiceReference(s)

• EventHook

• Intercept Service Event delivery

• ListenerHook

• Find out who is listening to what

Service HooksBundle

BundleB

Service HooksBundle

BundleB

ProxyBundle

Service HooksBundle

BundleB

FindHookEventHook

ProxyBundle

Service HooksBundle

BundleB

FindHookEventHook

ProxyBundle

Service HooksBundle

BundleB

FindHookEventHook

ProxyBundle

ListenerHook

Service HooksBundle

BundleB

FindHookEventHook

ProxyBundle

ListenerHook

Negative Permissions

• Java 2 Permissions are only positive

• That is, you grant a permission P

• PackagePermission(com.acme,IMPORT)

• Very hard to say, all permissions except P

• Lack of deny permissions

Negative Permissions

DENY { [...BundleSignerCondition "cn=*, o=ACME" "!" ] (...PackagePermission "com.acme.secret.*" "import,exportonly" ) } ALLOW { (...PackagePermission "*" "*" ) }

Compendium

• Initial Provisioning

• Bundle Tracker

• Declarative Services

• Remote Services

• Blueprint Extender

Remote Services

• RFC 119

• Formerly Distributed OSGi

• Distribution Software uses services to:

• Maps a service to/from a remote system

• Uses a service to abstract a communication endpoint

Remote Services

DistributionProvider

BundleB

Remote Services

XDistribution

ProviderDistribution

Provider

BundleB

Remote ServicesBundle

XDistribution

Provider

BundleB

XDistribution

Provider

BundleB

XDistribution

Provider

BundleB

XDistribution

Provider

BundleB

exports

XDistribution

Provider

BundleB

exports

XDistribution

Provider

BundleB

exports

XDistribution

Provider

BundleB

exports

XDistribution

Provider

BundleB

exports imports

XDistribution

Provider

BundleB

exports imports

XDistribution

Provider

BundleB

exports imports

XDistribution

Provider

BundleB

exports imports

XDistribution

Provider

BundleB

exports imports

Framework 1 Framework 2

Remote Services

• Service Properties define the interaction

• Intents specify the required/provided capabilities

• Filters used to match

• Service Component Architecture (SCA)

• Interaction specified, not mandated

• Flexible configuration options

Service Properties<other properties>

service.exported.intents

service.intents

service.exported.intents.extra

service.exported.interfaces

service.exported.configs

objectClass

service.imported.configs

service.imported

remote.intents.supported

remote.configs.supported

Distribution Provider

service.intents

objectClass

service.imported

service.intents

objectClass

service.imported

endpoint

service.intents

objectClass

service.imported

endpoint

Blueprint Extender

• RFC 124

• Provides Spring DM Functionality

• Blueprint Extender uses XML definitions in bundle to create & wire application objects

• Namespace Handler services, not yet :-(

• Provides damping

• Proxies services

Blueprint Extender

XMLBlueprintContainer

Blueprint Extender

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

BeanBeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

Service

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

Service

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

Reference

Service

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

Reference

Service

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

Reference

Service

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

Reference

Service

BeanMetadata

ServiceMetadata

ReferenceMetadata

Blueprint Extender

ApplicationObjects

Reference

Metadata

NonNull

Metadata

Component

Metadata

Service

Metadata

Service

Reference

Metadata

Collection

Metadata

Argument

Property

ListenerRegistration

Listener

Metadata

Target

Metadata

Reference

Metadata

Collection

Metadata

Damping Reference

serviceobjectApp proxy

serviceobject

Damping Reference

serviceobject

Damping Reference

serviceobject

Damping Reference

serviceobject

Damping Reference

serviceobject

Damping Reference

serviceobject

Damping Reference

App proxy

serviceobject

Damping Reference

App proxy

serviceobject

Damping Reference

App proxy

serviceobject

Damping Reference

App proxy

serviceobject

Damping Ref-list

serviceobject

Enterprise

• Transactions

• JDBC Database Access

• JMX

• JNDI

• JPA

• Connectors

Experimental

• TSL

• Nested Frameworks

• OBR

• A Tiny Script Language

• Feels like a shell

• Acts like a script language

• Uses reflection, but simplifies syntax

• No new commands

• Will become Felix project

TSLTelnetShell

ConsoleShell

...Shell

OSGiConvert.

EclipseConvert.

FelixConvert.

BasicCmnds

FrameWorkCmnds

ThreadIO

CommandShell

Converter

* osgi.command.name=xxx osgi.command.function=yyy

...Cmnds

TSLImpl

TSL $ echo Hello World Hello World $ echo <bundle 1> initial@reference:file:org.eclipse.osgi.util_3.1.200.v20070605.jar/ [1]

$ ls eclipse eclipse.ini load runner

$ ls /Ws aQute felix-trunk osgi osgi-books

$ <bundle 6> headers Tool Bnd-0.0.169 Bundle-Activator aQute.fileinstall.FileInstall Export-Package aQute.fileinstall ... Created-By 1.6.0_01 (Sun Microsystems Inc.) Bnd-LastModified 1184160147361 Bundle-Version 1.3 Bundle-ManifestVersion2 Manifest-Version 1.0 Import-Package aQute.fileinstall, ... Bundle-Name biz.aQute.fileinstall Bundle-Description This bundle watches a .... Bundle-SymbolicName biz.aQute.fileinstall

TSL $ help={each <<$it class> declaredmethods> {$it name }} aQute.shell.runtime.Closure@90a284 $ help <bundle 6> loadClass getResource ... checkLoader closeBundleLoader getLoaderProxy

$ echo $exception E: java.lang.NullPointerException $ echo $exception java.lang.NullPointerException $ $exception printstacktrace $ // the output is temporarily on reall stderr ...

Nested Frameworks

• Application Server Vendors want scoping of applications …

• Basic Idea OSGi is:

• The Application == the set of installed bundles

• Compromise:

• All Frameworks to be nested

Framework P

Nested Frameworks

SystemBundle

Framework P

Nested Frameworks

SystemBundle

CompositeBundle

Framework P

Nested Frameworks

Framework CSystemBundle

CompositeBundle

Framework P

Nested Frameworks

Framework CSystemBundle System

Bundle

CompositeBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Framework P

Nested Frameworks

Bundle

SurrogateBundle

CompositeBundle

AppBundle

Java Modularity

294dinsdag 14 juli 2009

Java Modularity

42dinsdag 14 juli 2009

Java Modularity

module

Java Modularity

module class Foo {}

public class Bar { module int foo() {}}

module interface Baz {}

Java Modularity

Visibilityvs

Accessibility

Visibility

ClassS

ClassT

Visibility

ClassS

ClassT

Visibility

ClassS

ClassT

Visibility

ClassS

ClassT

Visibility

ClassS

ClassT

Visibility

ClassS

ClassT

ModuleSystem

Accessibility

public

package

module

private

Accessibility

ClassS

Accessibility

ClassS

ClassT

package

Accessibility

ClassS

ClassT

Class U

module

package

Accessibility

ClassS

ClassT

Class U

ClassV

module

package

Accessibility

ClassS

ClassT

Class U

ClassV

module

package

Accessibility

ClassS

ClassT

ClassW

Class U

ClassV

Is JSR 294 aMeta Module System? (Implemented by OSGi™, Jigsaw, Guice, …)

No Java™ Standard for

Modules!dinsdag 14 juli 2009

Bundle

OSGi Modules: Bundle = Module

module

Bundle

OSGi Modules: Bundle = Multiple Modules

module A

module B

Bundle BBundle A

module

OSGi Modules: Modules Cross Bundles

Bundle

OSGi Modules: Nested?

module A

module B

Module Dependencies

Bundle A

module A

Bundle B

module B

Module Dependencies

Bundle A

module A

Bundle B

module B

requires

provides

permits

Module Dependencies

Bundle A

module A

Bundle B

module B

requires

provides

permits?dinsdag 14 juli 2009

Containers?

π 3.14

Containers?

π 3.14JLS

Containers?

π 3.14JLS JVM

Containers?

container com.acme

Containers?

container com.acme

Containers?

module com.acme.foo;

container com.acme

Containers?

module com.acme.foo;module bar;

container com.acme

Containers?

module com.acme.foo;module bar;private package one;

module com.acme.foo;module fiz;public package one;

container com.acme

Containers?

module com.acme.foo;module bar;private package one;

module com.acme.foo;module fiz;public package one;

module com.acme.foo;module bar;package one;import module fiz;module class A {}

module com.acme.foo;module fiz;package two;

class B {}

OSGi Users' Forum UK - OSGi Release 4 v4.2 Spec Overview - Peter Kriens

Technology

aQute Bundle Programming By Peter Kriens CEO aQute OSGi Director of Technology & OSGi Fellow

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