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Clive_Stewart
Level 6
October 16, 2015
Solved

When to use OSGI Bundles and when not to use them?

  • October 16, 2015
  • 6 replies
  • 1247 views

I understand how to  create an OSGI bundle using the Maven

- mvn -Padobe-public archetype:generate -DarchetypeRepository=http://repo.adobe.com/nexus/content/groups/public/ -DarchetypeGroupId=com.day.jcr.vault  -DarchetypeArtifactId=multimodule-content-package-archetype -DarchetypeVersion=1.0.2.

I understand the technical tasks required to make a bundle and in eclipse and import it into AEM. 

On the site i am working on I have been given 3 points of view for using OSGI Bundles in Components.

1) (Also my preference). Place as little code as possible inside JSP files, place all Java class code inside OSGI Bundle in eclipse and then import bundles into AEM.

2)  Bundles are kept simple, with as little as possible “data” in them.  Authors are empowered to configure as much as possible from the component dialog with the bundle simply doing the “heavy lifting”.

3) Avoid bundles, if and get the JSP to do processing, including placing classes in the JSP. While this can be made to work I can foresee problems in the future.This idea proposed was that the web site would consist of series of cards, each card holder just being a place for the Author's to drop components into. Each component would be a self sufficient module, with all java code existing in its jsp files. 

So my question is, is what is the best strategy for optimizing use of bundles (as in view 2).

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Best answer by Sham_HC
  • Keep data in repository and not in osgi bundle. 
  • Think of templating (Slightly) rather than jsp from the view point.
  • Little old video but not upto latest templating. might help http://www.youtube.com/watch?v=SNI6wr_u2a8
  • Make a good design and move global configurations to bundle & have flexibility to overide at component level also. In essence need both to create rich internet applications. The strategy depends on kind of application,requirements. 
  • with simple service-oriented component mode & platform for developing flexible and modular software do not know reason you would avoid using osgi which has both Real-time features and software runtime adaptation.  Many of you are using every day beyond the scene osgi bundle without your knowledge like
    • Health Home Care Program Monitors  
    • Commuter Bus Tracker application etc...

6 replies

smacdonald2008
smacdonald2008
Level 10
October 16, 2015

To follow up with Sham's answer -

Most web applications have backed processes doing the heavy crunching/processing and a thinner client. Be it a J2EE application, or a Spring Java app, most developers still employ back-end Java classes to do the job of processing data. In AEM, its really no different. A bundle is only a JAR with a MF file.   

Sham_HC
Sham_HCAccepted solution
Level 10
October 16, 2015
  • Keep data in repository and not in osgi bundle. 
  • Think of templating (Slightly) rather than jsp from the view point.
  • Little old video but not upto latest templating. might help http://www.youtube.com/watch?v=SNI6wr_u2a8
  • Make a good design and move global configurations to bundle & have flexibility to overide at component level also. In essence need both to create rich internet applications. The strategy depends on kind of application,requirements. 
  • with simple service-oriented component mode & platform for developing flexible and modular software do not know reason you would avoid using osgi which has both Real-time features and software runtime adaptation.  Many of you are using every day beyond the scene osgi bundle without your knowledge like
    • Health Home Care Program Monitors  
    • Commuter Bus Tracker application etc...
C
Clive_StewartAuthor
Level 6
October 16, 2015

Thank you for your reply.

 

You have given me clarity on the issue.

C
Clive_StewartAuthor
Level 6
October 16, 2015

If I have a class in my bundle that fetches data via a web Api as an XML string and I parse the string to create a list of Objects (The objects being a Model Class of each entity) , would that mean that I am breaking the advice of 

  • Keep data in repository and not in osgi bundle. 
Sham_HC
Sham_HC
Level 10
October 16, 2015

Clive Stewart wrote...

If I have a class in my bundle that fetches data via a web Api as an XML string and I parse the string to create a list of Objects (The objects being a Model Class of each entity) , would that mean that I am breaking the advice of 

  • Keep data in repository and not in osgi bundle. 

 

it should be fine for external integration & not frequently accessed.  

C
Clive_StewartAuthor
Level 6
October 16, 2015

Thank you

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