> So just to be sure - > Is OpenJPA going to keep the concept of multiple named cache in place at > the StoreManager level at least? > Is what you meant only from the perspective of the datacache layer itslef? > (I Hope it is ;) ).
Yes. > Why does OpenJPA do not have multiple named cache capability in its > datacache layer? Historical reasons, basically. OpenJPA is a subset of Kodo; multiple named caches was one of the things that was kept out of OpenJPA. -Patrick On Thu, Apr 3, 2008 at 3:31 PM, <[EMAIL PROTECTED]> wrote: > Patrick - thanks a lot for the answer - it helps a great deal understand > the design of openjpa. > > But - please - could clarify one part: > > You said - "OpenJPA has a single DataCache" - this is correct in how the > data cache is coded currently. But reading the source code of the > StoreManager - I can see that OpenJPA understand the concept of multiple > named cache very well. In fact I love the fact that the StoreManager > aggregate all changes at the cache level (based on name) before propagating > them to the datacache manager (it calls getCache(name)). This is fantastic > for me becuase since I am doing a new cache plug in for open jpa I can take > the call by the CacheStore and send one call to the cache and do the work > for the entire collection for a particular cache - This is a far more > efficient approach. > > So just to be sure - > Is OpenJPA going to keep the concept of multiple named cache in place at > the StoreManager level at least? > Is what you meant only from the perspective of the datacache layer itslef? > (I Hope it is ;) ). > Why does OpenJPA do not have multiple named cache capability in its > datacache layer? > > F > > > > > "Patrick Linskey" > <[EMAIL PROTECTED] > om> To > dev@openjpa.apache.org > cc > 04/03/2008 11:42 > AM Subject > Re: difference between datacache > and systemDataCache? > Please respond to > [EMAIL PROTECTED] > e.org > > > > > > > > > > > What is the exact concept behind the system wide datacache? > > Is it just a simplified way to get a proxy to all the caches in case > > someone needs it and does not know which cache exactly they should get? > It > > seems to just be fullfiling this role. > > Yep, that's its job. Since OpenJPA has just a single data cache (vs. > Kodo's multiple named caches), in OpenJPA this is not a proxy. > > > Why does the broker gets a reference to the systemDataCache when it is > > created? > > What code in particular are you asking about? > > -Patrick > > On Thu, Apr 3, 2008 at 10:29 AM, <[EMAIL PROTECTED]> wrote: > > > > What is the exact concept behind the system wide datacache? > > Is it just a simplified way to get a proxy to all the caches in case > > someone needs it and does not know which cache exactly they should get? > It > > seems to just be fullfiling this role. > > > > Why does the broker gets a reference to the systemDataCache when it is > > created? > > > > F > > > > > > > > -- > Patrick Linskey > 202 669 5907 > > > -- Patrick Linskey 202 669 5907
