[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2501) Read-only state of an entity in a session to propagate into subsequently lazy-loaded entities.

[Gunther Schadow (JIRA)]

Read-only state of an entity in a session to propagate into subsequently lazy-loaded entities.
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         Key: HHH-2501
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2501
     Project: Hibernate3
        Type: Improvement

  Components: core  
 Environment: any
    Reporter: Gunther Schadow


ISSUE:

Given an Entity entity and after Session.setReadOnly(entity), if the entity has lazy collections, lazy properties etc., other Entities are loaded into the Session upon navigating the object graph in the default read-writable state. However, it seems more reasonable to maintain the read-only state of the owning object.

REQUEST:

Ability to propagate read-only state of an entity in a session into other lazy-loaded entities.

BACKGROUND:

We have a system which permits users to make concurrent transactions which involve many of the same objects. Usually no changes happen on these shared objects, but instead connections (links) are made between these objects and new objects. For example, say you have an online meeting system, and every Meeting held has a link to a number of User object. The User objects are never changed in a Meeting, but there is a Relation called Participation (of User in Meeting) to which new relationships are added. When a new meeting is saved, it wants to save the  User objects simply because a new Participation link entry was added to the collection.

To an extent we can prevent this from happening by setting the Users explicitly to read-only. However, now suppose we added a function "Invite your Friends" to a Meeting, in which we would simply go:

for(User friend : currentUser.getFriends())
   meeting.addInvitation(friend);

Now an Invitation is like a Participation, and would be added into the User but now it wants to save these users just for a version upgrade only because they have received an Invitation.

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