Nuxeo Runtime 2Nuxeo Runtime 2recent and future workrecent and future work

Bogdan Stefanescu |

Overview

● What's Nuxeo Runtime?● Requirements● Components● Extensions

● What's next?● HK2 adoption● Dependency injection● More Annotations● Hot Deployment ?

What's Nuxeo Runtime?

● Nuxeo Runtime is the Nuxeo micro kernel. ● The foundation of all Nuxeo applications

● Nuxeo EP, Nuxeo RCP, Nuxeo WebEngine, Nuxeo Shell etc.

● Provides a modules subsystem● OSGI compatible modules (aka bundles)

● Provides a component model● Inspired from OSGI descriptive components ● Provides an extension point model● Provides a service model

Nuxeo Runtime - Requirements

● Nuxeo Runtime was designed to fulfill the following requirements:

● Applications are made from components.● Be able to assemble new applications from specific

set of components.● Be able to add / remove components into an

(optionally running) application.● Be able to deploy and run modules in any OSGi

framework.

● Provide an extension mechanism for components.

Nuxeo Runtime - Components

● Modules are implemented as OSGi bundles● A module may provide zero or more

components● Nuxeo Components are very similar to OSGi

components● Components are described through XML files.● Components are declared in the module

MANIFEST file● Components provides zero or more services

Nuxeo Runtime – Extensions

● Components may expose multiple extension points to let other components extend it

● Components may contribute any number of extensions to other components

● An Extension Point is an abstract concept● You can see it as a registry of things

● Extensions are declared using XML● XML fragments are mapped to real Java Objects

and registered against the target extension point

Nuxeo Runtime – Deployment

Nuxeo Runtime – Extensibility

Serializers

Views

Actions

Editors

MyExtensionPoint

What's next?

● Rewriting Nuxeo Runtime on top of HK2● HK2 is the micro kernel of GlassFish v3● HK2 is very similar with Nuxeo Runtime

● HK2 cool features:● Able to run in any OSGi framework● Provide dependency injection through annotations● Services are declared using annotations

● HK2 missing features:● Extension Points are missing from HK2! :-(

Nuxeo Runtime - HK2

● How extension point issue can be solved?● Already in contact with Sun HK2 developers● We will contribute to HK2 an extension point

mechanism

● Nuxeo Runtime will be an HK2 module ● That will add an extension points mechanism● That will preserve compatibility with existing model

● Nuxeo Modules will still be packaged as OSGi bundles

Nuxeo Runtime - Future

So, what Nuxeo Runtime 2 will provide?● OSGi compatible modules● Extension Points declared through annotations● Extensions declared as XML fragments● Services declared through annotations● Dependency injection through annotations● No more XML to declare things● Only pure configuration will be stored as XML● An HK2 micro kernel

Nuxeo Runtime – Is that all?●

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● Hot Deployment of Modules?

Thank you!Thank you!