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Re: Multiple Servers and Shared Editing Contexts

Did you ever try using one of the notification frameworks? I am playing with the Wonder JMS-based framework but can't seem to get it working just yet.

I would like to propagate updates individual rather than having to reload all of the data. The number of updates is small compared with the total amount of data.

Karl

On Nov 18, 2003, at 10:24 AM, Geoff Hopson wrote:


Yep - I did something similar on the Fortnum & Mason site. I cache the product catalog across multiple instances across multiple hosts in EOSharedEditingContexts, and have an admin app to manage the product catalog and content management. When the admin person hs made changes and is ready, he hits a button to "reload the instances". The way this works is the admin app has a WOLongResponsePage that sends a direct action to each instances (I know I have between 5 and 20) using a WOHTTPConnection, waiting for the response. The direct action is implemented in the main shopping application, and when the instance receives the request, it refreshes the EOSharedEditingContext holding the product catalog and the content.

Not at liberty to share code, I'm afraid...

Geoff

On Tuesday, November 18, 2003, at 02:52PM, Karl <email@hidden> wrote:

Hi List,

Has anyone had any experience with multiple instances of WO when you
are using the shared editing context?

We are keeping a lot of lookup tables in the sharedEC for performance
reasons and go through the process of taking a local copy, updating in
a privateEC, etc, when we need to update a value.

This all works just fine when you have just one instance of the app
running. The sharedEC observes the change in the privateEC and simply
updates itself (we specifically fetch any inserts that we make into the
privateEC).

Has anyone had any experience of running multiple instances and had to
deal with the fact that the sharedEC doesn't notice changes made by
other instances?

It looks like we have to implement our own notification framework to
keep the sharedECs in sync across multiple instances on multiple
servers.

Let me know if I am missing something....

Karl
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References: 
 >Re: Multiple Servers and Shared Editing Contexts (From: Geoff Hopson <email@hidden>)



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