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From Malcolm Edgar <malcolm.ed...@gmail.com>
Subject Re: sync cayenne cache in two web apps
Date Thu, 30 Jul 2009 01:00:07 GMT
You can also use OSCache with Cayenne and have the cached queries
expire frequently, i.e. after 30 seconds

regards Malcolm Edgar

On Thu, Jul 30, 2009 at 6:36 AM, Mike Kienenberger<mkienenb@gmail.com> wrote:
> Before you make your own custom solution, you might want to read up on
> Javagroup.  It might not be a problem to use it in your environment.
>
> The main page starts off with this:
>
> http://www.jgroups.org/
> ==================================
> JGroups is a toolkit for reliable multicast communication.
> (Note that this doesn't necessarily mean IP Multicast, JGroups can
> also use transports such as TCP).
>
> [...]
>
> JGroups comes with a number of protocols (but anyone can write their
> own), for example
>    * Transport protocols: UDP (IP Multicast), TCP, JMS
>
> ==================================
>
> So even if the TCP version doesn't do what you need, you might find it
> easier to write your own Jgroup protocol than to write your own
> cayenne event bridge.  It's more likely to be documented and there
> will be more examples/end users to ask questions of.  There might even
> be a tomcat shared session protocol out there somewhere.
>
>
> On Wed, Jul 29, 2009 at 4:16 PM, Tobias
> Schoessler<tobias.schoessler@gmail.com> wrote:
>> well i am reading this from the documentation:
>>
>> "... At the minimum, JMS setup requires a JMS server running, and subjects
>> for each of the DataDomains to be configured. JavaGroups is peer-to-peer
>> library that is embedded into applications. Default configuration provided
>> by CayenneModeler will work out of the box, provided that IP multicast is
>> enabled on the network."
>>
>> for the JMS solution the JMS server setup is a problem
>> for the JavaGroups setup the "IP multicast is enabled on the network."  is a
>> problem
>>
>> so  for the custom tranport mechanism that you mentioned I stumbled upon
>> this here
>>
>> http://jee-bpel-soa.blogspot.com/2009/06/session-sharing-in-apache-tomcat.html
>>
>> which seems to describe cross context data sharing on tomcat web contexts
>>
>> but is there any code to look at to see how a custom transport mechanism can
>> be setup?
>>
>> Tobias
>>
>>
>> On Wed, Jul 29, 2009 at 8:28 PM, Mike Kienenberger <mkienenb@gmail.com>wrote:
>>
>>> I've never set it up, but it's easily configurable.
>>>
>>> If you don't like the javagroups or JMS methodologies, you can define
>>> your own -- I don't know what tomcat app-data-sharing ability is
>>> available -- it probably depends on the container, but I don't
>>> remember reading about any in the past.
>>>
>>> However, the docs seem to indicate that using Javagroups is pretty
>>> painless with no external configuration to deal with.
>>>
>>> I have a Cayenne 1.1.x application I wrote that used remote
>>> notification internally to broadcast events between sessions, so I
>>> know it's not difficult to set up and define your own event
>>> broadcaster.  My guess is that doing it for javagroups is pretty easy
>>> since it sounds like a matter of just filling in the forms on the
>>> modeler.
>>>
>>> On Wed, Jul 29, 2009 at 2:15 PM, Tobias
>>> Schoessler<tobias.schoessler@gmail.com> wrote:
>>> > Thanks Mike,
>>> >
>>> > so the answer is yes, this can only be done using remote notification? is
>>> > this correct?
>>> >
>>> > Isn't there a way to share the cache among two web application scopes
>>> > without going through the hassle of setting up remote notification?
>>> >
>>> > When the two webapps are running on the same physical machine, inside the
>>> > same application server this seems overkill.
>>> >
>>> > Tobias
>>> >
>>> > On Wed, Jul 29, 2009 at 6:50 PM, Mike Kienenberger <mkienenb@gmail.com
>>> >wrote:
>>> >
>>> >> Yes,
>>> >>
>>> >> Here's a Cayenne 2.0 document on it:
>>> >>
>>> >> http://cayenne.apache.org/doc20/configuring-caching-behavior.html
>>> >>
>>> >> For 3.0:
>>> >>
>>> >> http://cayenne.apache.org/doc/configuring-caching-behavior.html
>>> >>
>>> >> On Wed, Jul 29, 2009 at 12:46 PM, Tobias
>>> >> Schoessler<tobias.schoessler@gmail.com> wrote:
>>> >> > Hi,
>>> >> >
>>> >> > is it possible to sync the cayenne cache of two web applications
>>> running
>>> >> in
>>> >> > the same tomcat?
>>> >> >
>>> >> > I observe one web app showing outdated data when the other is
>>> committing
>>> >> > updates. Both apps are using the same mapping configuration.
>>> >> >
>>> >> > Do I need to use remote notification for this?
>>> >> >
>>> >> > thanks
>>> >> >
>>> >> > Tobias
>>> >> >
>>> >>
>>> >
>>>
>>
>

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