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Subject: RE: Jackrabbit Best Practices/Design Patterns (an attempt)
Date: Wed, 7 Nov 2007 13:44:14 +0100
Message-ID: <F8E386B54CE3E6408F3A32ABB9A7908A1E3304@hai02.hippointern.lan>
Thread-Topic: Jackrabbit Best Practices/Design Patterns (an attempt)
Thread-Index: AcghKnQ5ecq0RVd5SqmR1Ug9dq+/PwAEXKvO
References: <13621138.post@talk.nabble.com> <13624765.post@talk.nabble.com>
From: "Ard Schrijvers" <a.schrijvers@hippo.nl>
To: <users@jackrabbit.apache.org>

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Not sure wether this is too abstract for you, but you might want to take =
a look over here:

http://wiki.apache.org/jackrabbit/DavidsModel

Regards Ard


I thought I would augment my question with a (simplified) example of =
what I'm
trying to do. Starting with a very basic approach:

Node root =3D session.getRootNode();
Node album =3D root.getNode("MyAlbum");
Node songs =3D album.getNode("songs");
Node song =3D songs.addNode("MySong");
song.setProperty("genre", "funky");
session.save();

I've expanded this into a richer object model:

public class Album{

	public static void main(){
=09
		Session session =3D null;
=09
		try{
			session =3D Repository.login();
			Node root =3D session.getRootNode();
		=09
			Album myAlbum =3D new Album(root.getNode("MyAlbum"));
			Song mySong =3D album.addSong("MySong");
			mySong.setGenre("funky");
			myAlbum.save();
		}
		catch(Exception e){
			System.err.println(e.getMessage());
		}
		finally{
			if(session !=3D null)
				session.logout();
		}
	}
}


class Album{

	private Node _album;
=09
	public Album(Node album){
		_album =3D album;
	}
=09
	public String getName(){
		Property name =3D _album.getProperty("name");
		return name.getString();
	}
=09
	public Song addSong(String name){
		Node songs =3D _album.getNode("songs");
		Node song =3D songs.addNode(name);
		return new Song(song);
	}
=09
	public void save(){
		_album.save();
	}
}

class Song{
	private Node _song;
=09
	public Song(Node song){
		_song =3D song;
	}
=09
	public void setGenre(String genre){
		_song.setProperty("genre", genre);
	}
}

What are your thoughts? Am I doing anything that might cause issues as
things get more complex? I'm new to the concept of JCR, so I'm very
interested in learning how I can use it in my code as naturally as =
possible.=20

Personally, I feel the "addSong" method is a little awkward, but I don't
really see another way to do it. Also, how long should sessions live? =
With
relational databases, best practice is to open and close the connection =
as
quickly as possible. However, it seems like JCR sessions can/should stay
open much longer. Any thoughts/tips/examples are very much appreciated!


loproman wrote:
>=20
> Hi,
>=20
> Does anyone know if there has been any research or documentation =
developed
> on best practices working with repositories?  Specifically, I'm =
wondering
> if there are any ideal patterns out there for working with the JCR =
API.
> I've seen lots of primitive examples where nodes are accessed directly =
via
> "getNode" and "addNode" etc. However, I think a more scalable solution
> would need to wrap nodes with domain logic (similar to how DTO objects =
are
> used with a relational database I suspect). Thanks!
>=20

--=20
View this message in context: =
http://www.nabble.com/Jackrabbit-Best-Practices-Design-Patterns-tf4762615=
.html#a13624765
Sent from the Jackrabbit - Users mailing list archive at Nabble.com.


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