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CDO View with Branching [message #1852745]

Thu, 02 June 2022 16:16

Claas Ziemke

Messages: 2
Registered: June 2022

Junior Member

Hello,

I have an EMF based project in which i am storing my EMF model in CDO in order to allow branching. I have to actively maintain different branches. Until now i have not implemented this feature in my Parsley based UI.

I have implemented a AuthenticatedCDOSessionManager which extends CDOSessionManager in order to allow me to use the CDO Authentication mechanism (the Parsley example does not support Authentication). This works flawlessly.

Now the idea was to also implement a BranchCDOResourceLoader which extends ResourceLoader. This also kind of works, as i can fetch the branch ID from a preference store during startup, and open a transaction with the correct branch. This mechanism however does not allow me to easily switch between the CDO branches without restarting Eclipse.

What is the correct way to trigger a reloading of the Parsley based View that also reloads the CDO Resource/Transaction?

Thanks in Advance!

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Re: CDO View with Branching [message #1852819 is a reply to message #1852745]

Mon, 06 June 2022 11:37

Lorenzo Bettini

Messages: 1812
Registered: July 2009
Location: Firenze, Italy

Senior Member

Hi

currently, in Parsley there's no such an automatic mechanism to deal with transactions in general on resources.

HOME: http://www.lorenzobettini.it
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Re: CDO View with Branching [message #1852849 is a reply to message #1852745]

Tue, 07 June 2022 15:52

Claas Ziemke

Messages: 2
Registered: June 2022

Junior Member

Dear Lorenzo,

thanks for the quick reply, i think this would be a really usefull feature for many Parsley users, What I have done as a workaround/hack:

1. Implemeted a "BranchCDOResourceLoader", basically the same as the CDOResourceLoader but:

private CDOTransaction openTransaction(URI resourceURI){

Net4jUtil.prepareContainer(IPluginContainer.INSTANCE);
TCPUtil.prepareContainer(IPluginContainer.INSTANCE);

CDOURIData data = CDOURIData.parse(resourceURI);

String server = data.getServer();
String repository = data.getRepository();

CDOSession cdoSession = sessionManager.getSession(server,repository);

CDOTransaction transaction = cdoSession.openTransaction();
transaction.options().addChangeSubscriptionPolicy(CDOAdapterPolicy.ALL);

CDOBranchManager branchManager = cdoSession.getBranchManager();
transaction.setBranch(branchManager.getBranch(branchId));

return transaction;
}

2. Implemented a "BranchView" that shows all CDO branches and on double-click: Sets the "branchId" of the "BranchCDOResourceLoader", programatically closes the transaction, closes all Parsley Views, reopens all Parsley views.

This is quite an ugly workaround IMHO but it does what i need...

Hope this helps someone!

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