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Posted to ojb-user@db.apache.org by Jair da Silva Ferreira Júnior <j2...@amazon.com.br> on 2004/01/03 17:56:05 UTC
timeout attribute in ObjectCacheDefaultImpl
Hi,
I am using ojb1.0_rc5, ODMG api with OJB queries, mysql4 (innodb tables)
in Linux Red Hat 7.3 (kernel 2.4.20-20.7).
I am using ObjectCacheDefaultImpl in my application as it's
read-intensive.
I have some questions about the behavior of the timeout attribute in
ObjectCacheDefaultImpl.
1- Is the timeout attribute new in rc5? In other words, did the
timeout attribute exist in rc4?
2- If I configure the cache using the OJB.properties file like this:
ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCacheDefaultImpl
descriptorBasedCaches=false
Is the timeout attribute set to 900 (default)?
Is there a way I can set this attribute in the OJB.properties
file or is it only set through the <object-cache> tag in the repository?
3- Is the time counter of a cached object reset when it is updated
(the object's data is changed and commited to the database)?
4- If a cached object timeouts and it is still being referenced by
other objects in my application (it is not elegible for garbage collection),
will it be returned from cache or will the object's data be reloaded from db
in the same JVM object or will a new JVM object be created to hold the
reloaded data?
Thanks,
Jair Jr
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Re: timeout attribute in ObjectCacheDefaultImpl
Posted by Armin Waibel <ar...@code-au-lait.de>.
Hi,
Jair da Silva Ferreira Júnior wrote:
> Hi Armin,
> Thank you very much for your reply.
> I forgot to ask you one thing: can I set the ObjectCacheDefaultImpl
> timeout to infinite (object cache never timeouts)? For example, timeout
> = -1?
>
I will add this possibility.
regards,
Armin
> Thanks,
> Jair Jr
>
>
>
>>Hi,
>>
>>Jair da Silva Ferreira Júnior wrote:
>>
>>
>>>Hi,
>>> I am using ojb1.0_rc5, ODMG api with OJB queries, mysql4 (innodb
>
> tables)
>
>>>in Linux Red Hat 7.3 (kernel 2.4.20-20.7).
>>> I am using ObjectCacheDefaultImpl in my application as it's
>>>read-intensive.
>>> I have some questions about the behavior of the timeout attribute in
>>>ObjectCacheDefaultImpl.
>>> 1- Is the timeout attribute new in rc5? In other words, did the
>>>timeout attribute exist in rc4?
>>
>>it's new to rc5
>>
>>
>>> 2- If I configure the cache using the OJB.properties file like
>
> this:
>
>>>ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCacheDefaultImpl
>>> descriptorBasedCaches=false
>>> Is the timeout attribute set to 900 (default)?
>>
>>yes, default timeout is 900 sec
>>
>>
>>> Is there a way I can set this attribute in the
>
> OJB.properties
>
>>>file
>>
>>no (think in 1.1 Version we will remove cache configuration from
>>OJB.properties file)
>>
>> or is it only set through the <object-cache> tag in the repository?
>>
>>yep, within jdbc-connection-descriptor or class-descriptor
>>
>>
>>> 3- Is the time counter of a cached object reset when it is
>
> updated
>
>>>(the object's data is changed and commited to the database)?
>>
>>yes
>>
>>
>>> 4- If a cached object timeouts and it is still being referenced
>
> by
>
>>>other objects in my application (it is not elegible for garbage
>
> collection),
>
>>>will it be returned from cache or will the object's data be reloaded
>
> from db
>
>>>in the same JVM object or will a new JVM object be created to hold the
>>>reloaded data?
>>
>>timeout has highest priority, thus it will be removed from cache whether
>>or not it's being referenced by other objects and be reloaded from DB
>>
>>regards,
>>Armin
>>
>>
>>>Thanks,
>>> Jair Jr
>>>
>>>
>>>
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>>>To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
>>>For additional commands, e-mail: ojb-user-help@db.apache.org
>>>
>>>
>>>
>>
>>
>>
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>>
>>
>
>
>
>
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>
>
>
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Re: timeout attribute in ObjectCacheDefaultImpl
Posted by Jair da Silva Ferreira Júnior <j2...@amazon.com.br>.
Hi Armin,
Thank you very much for your reply.
I forgot to ask you one thing: can I set the ObjectCacheDefaultImpl
timeout to infinite (object cache never timeouts)? For example, timeout
= -1?
Thanks,
Jair Jr
> Hi,
>
> Jair da Silva Ferreira Júnior wrote:
>
> > Hi,
> > I am using ojb1.0_rc5, ODMG api with OJB queries, mysql4 (innodb
tables)
> > in Linux Red Hat 7.3 (kernel 2.4.20-20.7).
> > I am using ObjectCacheDefaultImpl in my application as it's
> > read-intensive.
> > I have some questions about the behavior of the timeout attribute in
> > ObjectCacheDefaultImpl.
> > 1- Is the timeout attribute new in rc5? In other words, did the
> > timeout attribute exist in rc4?
>
> it's new to rc5
>
> > 2- If I configure the cache using the OJB.properties file like
this:
> >
> > ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCacheDefaultImpl
> > descriptorBasedCaches=false
> > Is the timeout attribute set to 900 (default)?
>
> yes, default timeout is 900 sec
>
> > Is there a way I can set this attribute in the
OJB.properties
> > file
>
> no (think in 1.1 Version we will remove cache configuration from
> OJB.properties file)
>
> or is it only set through the <object-cache> tag in the repository?
>
> yep, within jdbc-connection-descriptor or class-descriptor
>
> > 3- Is the time counter of a cached object reset when it is
updated
> > (the object's data is changed and commited to the database)?
>
> yes
>
> > 4- If a cached object timeouts and it is still being referenced
by
> > other objects in my application (it is not elegible for garbage
collection),
> > will it be returned from cache or will the object's data be reloaded
from db
> > in the same JVM object or will a new JVM object be created to hold the
> > reloaded data?
>
> timeout has highest priority, thus it will be removed from cache whether
> or not it's being referenced by other objects and be reloaded from DB
>
> regards,
> Armin
>
> >
> > Thanks,
> > Jair Jr
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> > For additional commands, e-mail: ojb-user-help@db.apache.org
> >
> >
> >
>
>
>
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> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
---------------------------------------------------------------------
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Re: timeout attribute in ObjectCacheDefaultImpl
Posted by Armin Waibel <ar...@code-au-lait.de>.
Hi,
Jair da Silva Ferreira Júnior wrote:
> Hi,
> I am using ojb1.0_rc5, ODMG api with OJB queries, mysql4 (innodb tables)
> in Linux Red Hat 7.3 (kernel 2.4.20-20.7).
> I am using ObjectCacheDefaultImpl in my application as it's
> read-intensive.
> I have some questions about the behavior of the timeout attribute in
> ObjectCacheDefaultImpl.
> 1- Is the timeout attribute new in rc5? In other words, did the
> timeout attribute exist in rc4?
it's new to rc5
> 2- If I configure the cache using the OJB.properties file like this:
>
> ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCacheDefaultImpl
> descriptorBasedCaches=false
> Is the timeout attribute set to 900 (default)?
yes, default timeout is 900 sec
> Is there a way I can set this attribute in the OJB.properties
> file
no (think in 1.1 Version we will remove cache configuration from
OJB.properties file)
or is it only set through the <object-cache> tag in the repository?
yep, within jdbc-connection-descriptor or class-descriptor
> 3- Is the time counter of a cached object reset when it is updated
> (the object's data is changed and commited to the database)?
yes
> 4- If a cached object timeouts and it is still being referenced by
> other objects in my application (it is not elegible for garbage collection),
> will it be returned from cache or will the object's data be reloaded from db
> in the same JVM object or will a new JVM object be created to hold the
> reloaded data?
timeout has highest priority, thus it will be removed from cache whether
or not it's being referenced by other objects and be reloaded from DB
regards,
Armin
>
> Thanks,
> Jair Jr
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
>
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