> -----Original Message----- > From: Adrian Brock > Sent: Monday, September 20, 2004 6:33 AM > To: Dimitris Andreadis > Cc: Ivelin Ivanov; Scott M Stark; Sacha Labourey > Subject: RE: XMBean > > I'm ok with discussing it, but if you expect ACID behaviour > you need to make each JBoss Server into an XAResource and do > two phase commit on the deployment operations. > > On Wed, 2004-09-15 at 11:11, Dimitris Andreadis wrote: > > This is a very long discussion, for reasons like what you consider > > part of a transaction, which tx semantics you want to have > (rollback > > or recover as well) and how the Mbeans model the underlying > resources. > > In general, you can't have "real" ACID transactions, > because there is > > usually no way to achieve Isolation, but you can get close to that. > > > > When it comes to the telco service > provisioning/configuration area (or > > infact any BPM scenario), I've solved this problem before using a > > single JCA adapter holding tx state and undelying Mbeans that > > understand particular technologies (e.g. setting routes on > switch X, > > providing webspace for a user, ...). The mbeans had to implement a > > particular contract, so as to participate in the tx and provide > > metadata for the creation of productivety tools on top. > > > > This is particularly important if you design workflows > (OakGroave? :) > > where integrating with external tx-capable resources > relieves you from > > the burden of "coding" rollback scenarios in your flows, > which can be > > a hell. > > > > So you could design in your flow (or simply call from your > EJBs if you > > hand-code): > > > > Begin > > do-something-on-external-resource-A > > do-something-on-external-resource-B > > do-something-on-external-resource-C > > sendJMSMessage > > updateDB > > do-something-on-external-resource-D > > Commit or Rollback > >
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