osgi in the enterprise

OSGi in the EnterpriseFilippo DiotaleviKnokode Ltd

[email protected]

mailto:[email protected]


OSGi in the Enterprise - Filippo Diotalevi

About

OSGi and Java Enterprise consultant

Java User Group Milano founder and coordinator

Apache Felix committer

http://www.diotalevi.com [email protected]

http://www.osgilook.com

http://www.diotalevi.com

http://www.diotalevi.com






OSGi

OSGi in the Enterprise

Case Studies

OSGi - A developer’s quiickstartSaturday 11.30 - 12.00

Summary


OSGi

A dynamic module system for Java


OSGi

1999 - OSGi Alliance founded, JSR 8

2000 - R1 published

2003 - Eclipse choose OSGi for the plugin

architecture

2007 - R4.1 published (JSR 291)

2009 - R4.2 published

2010 - Enterprise OSGi


OSGi

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010


OSGi

Building system from smaller components

Components working together

Managing components


OSGi

Service Layer

Lifecycle Layer

Module Layer


Module System

Clear boundaries

Dependencies

Metadata

Lifecycle


Lifecycle of bundle


Service System

Service Oriented Architecturein the JVM


Bundle Provider Bundle Consumer

Service Registry

RegisterService

RetrieveService

Service System


A collection of bundles interacting via Service interfaces

Bundles developed and installed independently

Bundle and services can appear and disappear

What’s an OSGi Application?


Demo


What’s behind the demo

Bundle Host

Provide the Frame and

define the Shape interface

Service Registry

Listen forand

retrieveShapes

Bundle Triangle

Provide the Triangle

implementation

Bundle Circle

Provide the Circle

implementation

RegisterTriangle

RegisterCircle



Why?

Create modular and reusable software

Create evolvable software

Create line of products



What?

Desktop Applications

Web Applications

Service Layers

Content Management System

Embedded/Mobile Applications

Cloud Applications


Examples:



How?Desktop Applications

♫

Eclipse

Rich Client Platform



How?Web Applications

♫

Spring Dynamic ModulesApache Sling

Apache Felix Karaf + Pax Web (Jetty)


Spring Dynamic Modules

Part of the Spring open source portfolio

Formerly known as Spring-OSGi

Works with every OSGi container

Allows you to implement Spring applicationson top of any OSGi framework


Java Virtual Machine

OSGi Container

Spring + Spring DM

Application Context

Application Context

Application Context

Spring Bean

Exported Service

Imported Service

Bundle ABundle B

Bundle C

Spring DM idea


One application context per bundle

When a bundle is started, its application contextis discovered and instantiated

Bundles can export Spring beans as OSGi services

Bundles can import OSGi services

Spring vs OSGi


Blueprint Service

Blueprint, dependency injectiona-la-Spring

Apache Geronimo Blueprint (may change in the future...)

http://wiki.ops4j.org/display/paxweb/Pax+Web

http://wiki.ops4j.org/display/paxweb/Pax+Web



How?Service Layers

♫

Spring Dynamic ModulesApache Felix

Apache ServicemixOSGi Remote Services


Coming soon...

Enterprise OSGi

Full Web Application Support (RFC 66)

JDBC integration

JNDI/LDAP integration

.....

look for Apache Aries (http://incubator.apache.org/aries)



Challenges and Opportunities

Modular Design

Development process and tools

Quality Assurance

Versioning and Dynamic Updates

Provisioning


Case Studies


Case Study 1: Service Layer

Goal

Create a service layer where services

- can be deployed/updated at runtime without causing service disruptions - can be customized for specific customers - (possibly) reusing some existing components



Solution: architecture

Generic REST API

WeatherService

NewsService

Embedded Jetty ServerPOJO -> XML transformation

Spring DMSpring



Solution: evolution

Generic REST API

WeatherService

NewsService V.2

NewsService

(BBC only)Twitter



Lessons learned

“Right” modularization is hard, and there is no fixed rule

Spring DM gets developers back in their confort zone (and hides OSGi APIs)

Deployment loves it (dynamicity, console, modularity)


Case Study 2: OSGi in the Cloud

Goal

Manage completely the deployment of a Web Application in a cluster of Amazon virtual machines

Applications are modular, modules can be updated without causing service disruption



Goal

“Cloud console” ?



Solution: architecture

WebConsole

Amazon EC2 ClusterWeb Application based on Apache Felix Karaf

BundleRepository

UploadDefine packages

Start

Provision (SSH)

Load

Start

MySQL (Amazon EBS or RDS)

Start

Amazon Elastic Load Balancer

EC2

EBS/RDS

ELB


Case Study 3: Float management

Goal

Manage a float of Java-enabled devices

- check the software installed

- push software updates


Case Study 3: Float management

Solution: Apache ACE


Conclusion

OSGi is an enabling technology

that opens up new opportunities


Questions?

osgi in the enterprise

Technology

enterprise osgi osgi

enterprise filippo diotalevi

spring osgi

osgi application

enterprise case studies

java osgi

osgi servicesosgi

osgi frameworkosgi