Setting Refresh of entity beans in ejb3.0

Question

Hi,
I wonder how you can set the refresh rate of entity beans in the EJB 3.0 model. I want to this to avoid explicit calls to of the refresh method of the entitymanager...

Answer 1

The easiest way to cope with this seems to be to just create a new Collection in the business method that wants to manipulate the collection, based on the collection that the read-only getter delivers, .add/.remove on that collection instead, and then use the set-method to write it back, like this (old code commented out):
contentEJB = contentMasterHome().findByPrimaryKey(contentID);
//themeEJB.getContent().add(contentEJB);
Collection content = new ArrayList(themeEJB.getContent());
content.add(contentEJB);
themeEJB.setContent(content);
The overhead is that a new collection has to be created, populated and written back, and I suppose the sql that actually runs when the set method is called is more heavy, but still it's outweighted by the overall performance gain. I'm writing a small CMS system (ie. re-inventing the wheel), and updates aren't that frequent after all, and it won't handle waste amounts of content anyway.
Jon Martin Solaas