[appengine-java] Re: Lazy Loading, Spring MVC and PersistenceManager Closing

[Al]

Interesting - thanks to both, will check out both options.

On Dec 14, 8:52 pm, abhi abhishek9...@gmail.com wrote:
 Hey ,
 why do you want to close the persistance manager here, you are not
 saving or updating any entities.

 You should use a static PMF class to get the entity manager und you
 feed class should have something like this ...

 class FEED {
 private static PersistenceManager pm;

 // this fetches the persistance manager when u need it.
 private static PersistenceManager getPM() {
                 if (pm == null) {
                         pm = PMF.get().getPersistenceManager();
                 } else if (pm.isClosed()) {
                         pm = PMF.get().getPersistenceManager();
                 }
                 return pm;
         }

 @SuppressWarnings(unchecked)
         public static ListFEED getAll() {
                 PersistenceManager pm = getPM();
                 String sqlFetch = SELECT FROM  + FEED.class.getName();
                 Query query = pm.newQuery(sqlFetch);
                 query.setOrdering(name asc);
                query.setRange(0, 50);
                 ListFEED feeds = (ListFEED)query.execute();
                 return feeds;
         }

 Convinienty in your handleRequestInternal calss u can get the results -

   ListFeed feeds = FEEDS.getAll();

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[appengine-java] Re: Lazy Loading, Spring MVC and PersistenceManager Closing

[abhi]

Hey ,
why do you want to close the persistance manager here, you are not
saving or updating any entities.

You should use a static PMF class to get the entity manager und you
feed class should have something like this ...

class FEED {
private static PersistenceManager pm;

// this fetches the persistance manager when u need it.
private static PersistenceManager getPM() {
if (pm == null) {
pm = PMF.get().getPersistenceManager();
} else if (pm.isClosed()) {
pm = PMF.get().getPersistenceManager();
}
return pm;
}


@SuppressWarnings(unchecked)
public static ListFEED getAll() {
PersistenceManager pm = getPM();
String sqlFetch = SELECT FROM  + FEED.class.getName();
Query query = pm.newQuery(sqlFetch);
query.setOrdering(name asc);
   query.setRange(0, 50);
ListFEED feeds = (ListFEED)query.execute();
return feeds;
}


Convinienty in your handleRequestInternal calss u can get the results -

  ListFeed feeds = FEEDS.getAll();

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