Home » Eclipse Projects » EclipseLink » Caching a Multi-tenant applicantion
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| Re: Caching a Multi-tenant applicantion [message #499362 is a reply to message #499353] |
Sat, 21 November 2009 12:25   |
 Geraldo Lopes de Souza
Messages: 6
Registered: November 2009 |
Junior Member |
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tbee,
By "disable caching" have you meant shared cache ?.
According to the docs there are 3 types of caches: Session cache, Unit
of Work Cache and Isolated Client session. Which one do you use ?
Thank you in advance,
Geraldo Lopes de Souza
References
http://wiki.eclipse.org/Introduction_to_Cache_%28ELUG%29
http://wiki.eclipse.org/Introduction_to_EclipseLink_Sessions _%28ELUG%29#Isolated_Client_Sessions
Em 21-11-2009 05:31, tbee escreveu:
> As soon as you have multiple clients accessing the database (in my case
> stand alone swing apps) you need to disable caching in order to be able
> to get changes made in the DB into your memory.
>
>
> Geraldo Lopes de Souza wrote:
>> Hi,
>>
>> First, let me thank you for your effort making this product available
>> as community open-source.
>>
>> Consider a multi-tenant application, that uses a shared database with
>> differents schemas (one for each tenant) , with a three tier web
>> application.
>>
>> Can you share your thoughts of how caching could be enabled in this
>> kind of application and what are the consequences.
>>
>> Thank you in advance, and please be tolerant with my english and
>> little knowledge of EclipseLink
>>
>> Geraldo Lopes de Souza
>>
>>
>>
>>
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| Re: Caching a Multi-tenant applicantion [message #499698 is a reply to message #499349] |
Mon, 23 November 2009 18:36 |
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How are you enabling each tenant to use their own schema?
If you have a persistence-unit or EntityManagerFactory per tenant, then you should be fine with the shared cache on, which is the default.
If you have a single persistence-unit, or single EntityManagerFactory, and are configuring the different schemas per EntityManager, then you need to disable the shared cache, as each EntityManager sees different data.
The shared cache is the session cache.
It can be disabled using the persistence-unit property,
"eclipselink.cache.shared.default"="false"
You can also selectively disable/enable it for certain classes, if you have some data in a shared schema.
The UnitOfWork and IsolatedClientSession cache can be for the most part ignored, the only live as long as the EntityManager or transaction.
James : Wiki : Book : Blog : Twitter
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| Re: Caching a Multi-tenant applicantion [message #499794 is a reply to message #499362] |
Tue, 24 November 2009 08:11 |
Tom Eugelink
Messages: 817
Registered: July 2009 |
Senior Member |
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Half my family has the mexican flue, so I needed to divert some of my time the last few day :-)
Anyhow, I'm using JPA and I configured this in order to get the changes in the DB made by other EM's, after I do a clear() on mine;
lOptions.put(PersistenceUnitProperties.CACHE_SHARED_DEFAULT, "false");
FYI: CACHE_TYPE_DEFAULT = "eclipselink.cache.type.default"
Geraldo Lopes de Souza wrote:
> tbee,
>
> By "disable caching" have you meant shared cache ?.
> According to the docs there are 3 types of caches: Session cache, Unit
> of Work Cache and Isolated Client session. Which one do you use ?
>
>
> Thank you in advance,
>
> Geraldo Lopes de Souza
>
> References
> http://wiki.eclipse.org/Introduction_to_Cache_%28ELUG%29
> http://wiki.eclipse.org/Introduction_to_EclipseLink_Sessions _%28ELUG%29#Isolated_Client_Sessions
>
>
>
> Em 21-11-2009 05:31, tbee escreveu:
>> As soon as you have multiple clients accessing the database (in my case
>> stand alone swing apps) you need to disable caching in order to be able
>> to get changes made in the DB into your memory.
>>
>>
>> Geraldo Lopes de Souza wrote:
>>> Hi,
>>>
>>> First, let me thank you for your effort making this product available
>>> as community open-source.
>>>
>>> Consider a multi-tenant application, that uses a shared database with
>>> differents schemas (one for each tenant) , with a three tier web
>>> application.
>>>
>>> Can you share your thoughts of how caching could be enabled in this
>>> kind of application and what are the consequences.
>>>
>>> Thank you in advance, and please be tolerant with my english and
>>> little knowledge of EclipseLink
>>>
>>> Geraldo Lopes de Souza
>>>
>>>
>>>
>>>
>
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| Re: Caching a Multi-tenant applicantion [message #499930 is a reply to message #499794] |
Tue, 24 November 2009 14:41 |
Geraldo Lopes de Souza
Messages: 6
Registered: November 2009 |
Junior Member |
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|
tbee,
Thanks for the answers and good luck for you and your family.
Regards,
Geraldo
Em 24-11-2009 06:11, tbee escreveu:
> Half my family has the mexican flue, so I needed to divert some of my
> time the last few day :-)
>
> Anyhow, I'm using JPA and I configured this in order to get the changes
> in the DB made by other EM's, after I do a clear() on mine;
>
> lOptions.put(PersistenceUnitProperties.CACHE_SHARED_DEFAULT, "false");
>
> FYI: CACHE_TYPE_DEFAULT = "eclipselink.cache.type.default"
>
>
> Geraldo Lopes de Souza wrote:
>> tbee,
>>
>> By "disable caching" have you meant shared cache ?.
>> According to the docs there are 3 types of caches: Session cache, Unit
>> of Work Cache and Isolated Client session. Which one do you use ?
>>
>>
>> Thank you in advance,
>>
>> Geraldo Lopes de Souza
>>
>> References
>> http://wiki.eclipse.org/Introduction_to_Cache_%28ELUG%29
>> http://wiki.eclipse.org/Introduction_to_EclipseLink_Sessions _%28ELUG%29#Isolated_Client_Sessions
>>
>>
>>
>> Em 21-11-2009 05:31, tbee escreveu:
>>> As soon as you have multiple clients accessing the database (in my case
>>> stand alone swing apps) you need to disable caching in order to be able
>>> to get changes made in the DB into your memory.
>>>
>>>
>>> Geraldo Lopes de Souza wrote:
>>>> Hi,
>>>>
>>>> First, let me thank you for your effort making this product available
>>>> as community open-source.
>>>>
>>>> Consider a multi-tenant application, that uses a shared database with
>>>> differents schemas (one for each tenant) , with a three tier web
>>>> application.
>>>>
>>>> Can you share your thoughts of how caching could be enabled in this
>>>> kind of application and what are the consequences.
>>>>
>>>> Thank you in advance, and please be tolerant with my english and
>>>> little knowledge of EclipseLink
>>>>
>>>> Geraldo Lopes de Souza
>>>>
>>>>
>>>>
>>>>
>>
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