OSGi Applications Clustering using Distributed Shared Memory

Context Contribution Validations Perspectives

OSGi Applications Clustering using DistributedShared Memory

Anthony Gelibert1 Walter Rudametkin2 Didier Donsez2

Sebastien Jean1

1Grenoble Institute of Technology,LCIS Laboratory, CTSYS Team

Valence, [email protected]

2Grenoble University,LIG Laboratory, ADELE Team

Grenoble, [email protected]

11th Annual International Conference on New Technologiesof Distributed System

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Agenda

1 ContextOSGiOSGi and DistributionDistributed Shared Memory

2 ContributionPropositionUse CasesToolchainExample

3 ValidationsEvent AdminCiliauGASP

4 Perspectives

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OSGi

Hardware

Operating System

Java Virtual Machine

OSGi Framework

Bundle 1 Bundle 2 Bundle N

Figure: OSGi & System-Layering

De facto Module System(“bundle”) for Java(Eclipse IDE & RCP,JavaEE, OSGiME).

Dependency management.

Service OrientedArchitecture with DirectReferences.

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OSGi (cont.)

Figure: OSGi Bundle Life-Cycle

Dynamic ComponentModel.

Dynamic evolution:No JVM reboot.

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Remote Method Invocations

Stub

RRL

Transport Layer

Skeleton

RRL

Client Server

Figure: Remote Method Invocation

Use a stub to call methodsexported by a remoteskeleton.

Many solutions for OSGi :

R-OSGiROSEExtended ServiceBinderSCARemote Services

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Distributed Deployment

Several bundle repositories.

Bundle offering the same functionalities on each.

Deployment optimizing non-functional parameters.

Use a P2P overlay.

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Distributed Shared Memory

P2P1 • • • Pn-1P0

Software DSM Layer

MEMMEMMEM MEM

Network

Figure: Software Distributed Shared Memory

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Terracotta

JVM

Application

Shared Objects

Host 1

• • •DSO Lib JVM

Application

Shared Objects

Host 2

DSO Lib JVM

Application

Shared Objects

Host N-1

DSO Lib

Terracotta Server

Figure: Terracotta

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Proposition


JVM

OSGi

Clustered Service

Module A

Module B

JVM

OSGi

ClusteredService

Module C

Figure: Clustered Service

Clustered (i.e. Replicated)Services.Apply DSO to Servicespublished in distributed[OSGi / JVM] platforms.Avoid the re-engenerringgymnastic to distributeOSGi services.

Clustered Bundles:Bundles containing servants providing and consuming localand clustered services

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Pitfalls

Versioning of Clustered Bundles

Dynamic Updates of clustered bundles1

1Synchronous vs. Asynchronous10 / 25


Use Cases

Traditional targets of distributed shared memoryState sharingMessage bus

Re-engineering of existing solutionsParallelization of servicesOriginal data access paradigm

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Toolchain

Java CodeAnnotations

Annotation Processing Tool

Annotation Processor

DSM Configuration File

Java Compiler

Java Classes

Build-time

Supplied by user Provided tools

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Example

Annotations for Terracotta

Enabling the delegation of class loading

Figure: Annotations in the source code

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Example (cont.)

APT Maven plugin

Terracotta Configuration File

Figure: Build process

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Validations

Various use cases validated.

Chosen pieces:Event AdminCiliauGasp

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Event Admin

OSGi Platform


Producer of

eventsBridge

OSGi Platform

BridgeConsumer

of events

Indicates a propagation of events

Figure: Propagation of events across multiple platforms

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Cilia

Mediator 1

ProcessorScheduler

handler

Collector

Dispatcherhandler

Sender

Mediator 2

ProcessorScheduler

handler

Collector

Dispatcherhandler

Sender

Mediator 3

ProcessorScheduler

handler

Collector

Dispatcherhandler

Sender

Mediator 2'

ProcessorScheduler

handler

Collector

Dispatcherhandler

Sender


Figure: Replication and persistence in pervasive applications

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uGASP

Game Server A(u)GASP + Bluetooth antenna

Game Server B(u)GASP + Bluetooth antenna

Migration of the players from A to B

without any loss of data


Player on the server A

Playeron the server A

Playeron the server A

Player previously

on the server A

Playerpreviously

on the server A

Playerpreviously

on the server A

Figure: State share for a DTN application

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Future works

Terracotta containerExtension of the container:

Enhance Terracotta integrationAdd persistence, cache. . .

Dynamic updateDynamically update clustered services at run-timeRun-time compliance & Update policiesUpdate without stopping the bundle.

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Thank you for your attention!———————

Contact: [email protected]

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Additional information—————————————————

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Further information

Terracotta Documentation, download. . .http://www.terracotta.orgOpen Sourcehttp://www.terracotta.org/open-source

Felix Documentation, download. . .http://felix.apache.org

Chameleon Documentation, download. . .http://wiki.chameleon.ow2.org

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http://www.terracotta.org

http://www.terracotta.org/open-source

http://felix.apache.org

http://wiki.chameleon.ow2.org


Complete toolchain

Java CodeAnnotation Java 5.0

Annotation Processing Tool

Annotation ProcessorTerracotta-specific

classesDSM-generic

classes

Terracotta configuration file

Java Compiler

Java Classes

Terracotta java agent + Java

Terracotta Server(s) Cluster

Build-time

Supplied by user Provided tools

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Cilia mediators

Mediator 1

ProcessorScheduler

handler

Collector

Dispatcherhandler

Sender

Mediator 2

ProcessorScheduler

handler

Collector

Dispatcherhandler

Sender

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Cluster

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Date post:	20-May-2015
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OSGi Applications Clustering using Distributed Shared Memory

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