Thanks David, but we are stuck with Struts and EJB 2.1 at the moment. --- On Sun, 6/14/09, David Blevins <david.blev...@visi.com> wrote:
From: David Blevins <david.blev...@visi.com> Subject: Re: using static helper classes within servlets To: "Tomcat Users List" <users@tomcat.apache.org> Date: Sunday, June 14, 2009, 5:43 PM Hey all, If the goal is to ensure that only one instance is in the webapp, I'd recommend the new EJB 3.1 bean type @Singleton which is supported in OpenEJB 3.1 and 3.1.1. http://openejb.apache.org/3.0/singleton-example.html http://openejb.apache.org/singleton-ejb.html Instantiation can be done at startup or lazily. All method access synchronization is handled for you via @ConcurrencyManagement(CONTAINER) or by you @ConcurrencyManagement(BEAN). Regardless of that choice we will still handle sychronization of instantiation, so double-check-locking or other things will not be necessary. -David On Jun 14, 2009, at 11:19 AM, Martin Gainty wrote: > > that would be the simplest solution > > i *think* the OP wanted a complete EJB jar implementation (using either > annotations and or ejb-jar.xml) > which can be accomplished with OpenEJB except he would need to know the type > vis-a-vis Stateless/Stateful Local/Remote beforehand > http://openejb.apache.org/3.0/examples.html > > thanks, > Martin > ______________________________________________ > Verzicht und Vertraulichkeitanmerkung/Note de déni et de confidentialité > > Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene Empfaenger > sein, so bitten wir hoeflich um eine Mitteilung. Jede unbefugte Weiterleitung > oder Fertigung einer Kopie ist unzulaessig. Diese Nachricht dient lediglich > dem Austausch von Informationen und entfaltet keine rechtliche > Bindungswirkung. Aufgrund der leichten Manipulierbarkeit von E-Mails koennen > wir keine Haftung fuer den Inhalt uebernehmen. > Ce message est confidentiel et peut être privilégié. Si vous n'êtes pas le > destinataire prévu, nous te demandons avec bonté que pour satisfaire informez > l'expéditeur. N'importe quelle diffusion non autorisée ou la copie de ceci > est interdite. Ce message sert à l'information seulement et n'aura pas > n'importe quel effet légalement obligatoire. Étant donné que les email > peuvent facilement être sujets à la manipulation, nous ne pouvons accepter > aucune responsabilité pour le contenu fourni. > > > > >> Date: Sun, 14 Jun 2009 13:01:31 -0400 >> Subject: Re: using static helper classes within servlets >> From: jhmast.develo...@gmail.com >> To: users@tomcat.apache.org >> >> I've not done anything with EJBs and I'm not sure what exactly you mean by >> static "properties". I have however dealt with reducing instantiations in >> servlets. I simply created a BeanBag class with static methods to each one >> of my beans; these are not "proper" beans, but where simply objects that >> were formerly used in JSP via the jsp:useBean directive. >> >> Here is the general pattern: >> >> class BeanBag { >> private static SomeBean someBean = null; >> >> public static synchronized getSomeBean() { >> if (someBean == null) someBean = new SomeBean(); >> return someBean; >> } >> } >> >> I have now numerous Servlets, JSPs and POJOs that use BeanBag to obtain >> singleton instances of my beans. Its worked great for me. >> >> >> On Sun, Jun 14, 2009 at 8:28 AM, Sid Sidney <pvcsv...@yahoo.com> wrote: >> >>> >>> >>> >>> HI, >>> >>> >>> >>> In my web app, my servlets user several delegate classes that connect >>> to ejbs (session beans.) I was thinking >>> about putting these delegates into a helper class as static properties. >>> That way my servlets can just reference the same delegates. I >>> don't want to have to create a new instance of a delegate with every >>> request that my servlet(s) handles. >>> >>> >>> >>> However, I'm wondering if this will cause synchronization issues with >>> multiple requests being handled, as our site handles a heavy load of >>> requests. Any suggestions would be appreciated? >>> >>> >>> > > _________________________________________________________________ > Insert movie times and more without leaving Hotmail®. > http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=TXT_TAGLM_WL_HM_Tutorial_QuickAdd_062009 --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
