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Caching objects in EJB and threading

Justin Chu
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Joined: Apr 19, 2002
Posts: 209
    
    1
What's a correct way to maintain a cache of objects queried from the database and make it available to remote clients through a SLSB?

Seems like it is very difficult to achieve this without violating EJB rules against managing threads and static variables (or by using singleton). In order to have objects shared by threads, they have to be stored in some static scope, and synchronization is a must.
[ December 10, 2008: Message edited by: Justin Chu ]
Reza Rahman
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Joined: Feb 01, 2005
Posts: 580
    
    5
Justin,

If you are using EJB 2.x, entity beans will do that for you, if you can stomach the complex development model. If you are using EJB 3.0, the way to do this would be through second-level caching. In Hibernate nomenclature, this is called an L2 cache: http://www.devx.com/dbzone/Article/29685. TopLink/EclipseLink has similar capabilities: http://wiki.tangosol.com/display/COH33UG/Using+Coherence+and+TopLink+Essentials. You can also always use Hibernate or JPA with EJB 2.x (very common scenario).

Regards,
Reza


Independent Consultant — Author, EJB 3 in Action — Expert Group Member, Java EE 6 and EJB 3.1
 
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subject: Caching objects in EJB and threading
 
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