Patches item #583313, was opened at 2002-07-18 07:07 You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=402706&aid=583313&group_id=31602
Category: None Group: None Status: Open Resolution: None Priority: 5 Submitted By: Andrew H. Barkley (andrew_barkley) Assigned to: Nobody/Anonymous (nobody) Summary: Value object bidirectional relationships Initial Comment: I have a solution to the bidirectional relationships problem. The fundamental problem is the recurrence of get*Value() calls between arbitrary beans. This cycle can get very complex, so you can't simply rely on a solution that fixes the problem between just two beans. The solution is to maintain a simple database- like cache of the constructed value objects. The cache can be a simple object, such as a Map. The Map would be keyed by entity name to another Map, that would then be keyed by primary key to a value object. When a get*Value() method is called for an entity bean, it will first try to retrieve its value object from the cache. If not present, the value object will be created and stored in the cache. The value object will then be returned. The simplest means of creating and maintaining this cache would is to add a get*Value(Map) method for every existing get*Value() method. The get*Value() method will simply instantiate the Map, and delegate to get*Value(Map). The get*Value(Map) method will then perform mostly the same logic that is currently in get*Value(), wrapped with the cache lookup. However, it must use the get*Value(Map) methods of other beans, rather than the cache- less versions. After the whole graph of value objects is created, the cache will simply go out of scope and be garbage collected. This solution does not rely on maintaining state within beans about value objects and is fully serializable, so it will even be stable for remote relationships (remote entities). The disadvantage is in the added maintenance of now a pair of getters for every value object. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=402706&aid=583313&group_id=31602 ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Xdoclet-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/xdoclet-devel
