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Proper EntityManger in multi-thread App [message #905141]

Wed, 29 August 2012 19:38

Chad Curtis

Messages: 8
Registered: July 2012
Location: Minnesota

Junior Member

Is it better to have an entity manager per thread, when shared cache is off, or only open and close an entity manager when you write to the database? This comes from the ConcurrancyManager.acquire() method hanging, for what i can tell is no valid reason. Would separate entity managers per thread solve this?

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Re: Proper EntityManger in multi-thread App [message #905333 is a reply to message #905141]

Thu, 30 August 2012 07:31

Tom Eugelink

Messages: 817
Registered: July 2009

Senior Member

On 2012-08-29 21:38, Chad Curtis wrote:
> Is it better to have an entity manager per thread, when shared cache is off, or only open and close an entity manager when you write to the database? This comes from the ConcurrancyManager.acquire() method hanging, for what i can tell is no valid reason. Would separate entity managers per thread solve this?

AFAIK an EM is not thread save, so if multiple threads are accessing the same EM, you should either synchronize them, or use separate EM's for each thread.

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Re: Proper EntityManger in multi-thread App [message #908652 is a reply to message #905333]

Wed, 05 September 2012 18:33

Chad Curtis

Messages: 8
Registered: July 2012
Location: Minnesota

Junior Member

Thanks for the advice, I went with multiple entity mangers.

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