Ron, On Oct 8, 2013, at 4:48 PM, "Roskens, Ronald" <ronald.rosk...@biworldwide.com> wrote:
> When you look at OS packages, they have can run things at a pre and post > stages, and maybe a rollback procedure. So maybe there should be a > preExecute() method that would run some checks to ensure that what it would > execute() would work? > > if I was going to migrate from JRobin v1 to RR4J v2 formatted RRDs, I’d want > to know that I had enough disk space around before doing a conversion. Then, > as an option a postExecute() could remove all the JRobin v1 files. (Imagine > if RRD data moved into Cassandra or some other backend…) > > Or another case might be having the a step do a database backup for us before > running the installer for database components. We’d want to have enough space > around for the database backup before doing the upgrade. > > So then upgrade would run all the preExecutes(), and if they all succeeded, > run all the executes(), and if they all succeeded, run all the > postExecutes(). If any of the executes() failed, attempt to rollback > executing a rollback() method? I like the ideas, I'm going to upgrade my proof of concept with them. Thanks! Alejandro.
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