[rules-users] Continuous deployment of rules/vetoing changesets

[Stephen Masters]

One option:

Point your production environment at a LIVE snapshot (or whatever you want to call it) instead of LATEST.
Point your CI build at LATEST.
On successful completion of the test suite, create a new LIVE snapshot.
That way, you can always see the current live version of your rules in Guvnor, and diff them if you need to.

Steve



On Jun 27, 2012, at 03:20 PM, Gustaf Cele <gustaf.cele at databyran.se> wrote:

Hi Wolfgang!

A staging area sounds like a good idea. Would something as simple as this work?

KnowledgeAgent stagingAgent = connectToGuvnorAndStartPolling();
KnowledgeBase productionKnowledgeBase = ...;
stagingAgent.addEventListener(new DefaultKnowledgeAgentEventListener() {
@Override
public void beforeChangeSetApplied(BeforeChangeSetAppliedEvent event) {
if (allTestsPass()) {
// copy rules from stagingAgent to productionKnowledgeBase, somehow
}
});

... and in that case, how would I go about the copying part? Is it safe to just save the reference from stagingAgent.getKnowledgeBase() if the agent is configured with drools.agent.newInstance=true?

/g

-----Original Message-----
From: Wolfgang Laun [mailto:wolfgang.laun at gmail.com] 
Sent: den 27 juni 2012 15:45
To: Rules Users List
Subject: Re: [rules-users] Continuous deployment of rules/vetoing changesets

Have you considered using a "staged" approach?

Rather than forwarding LATEST right into production, have one listener move it into the staging area or not - depending on the tests. The production side listener(s) are directed onto the staging area.

-W



On 27/06/2012, Gustaf Cele <gustaf.cele at databyran.se> wrote:
> Hi,
>
> I have a Guvnor server (5.4.0.Final) which provides rules to a client 
> (which itself is an EJB server app) using KnowledgeAgents to get hold 
> of rule updates. The knowledge agents are started with changeset XMLs 
> on the classpath which point at my Guvnor instance.
>
> The KnowledgeAgents are set up thus:
>
> ResourceFactory.getResourceChangeNotifierService().start();
> ResourceFactory.getResourceChangeScannerService().start();
> KnowledgeAgent knowledgeAgent =
> KnowledgeAgentFactory.newKnowledgeAgent(agentName);
> knowledgeAgent.monitorResourceChangeEvents(true);
> Resource resource =
> ResourceFactory.newClassPathResource(changeSetResourcePath, getClass());
> knowledgeAgent.applyChangeSet(resource);
> ResourceFactory.getResourceChangeNotifierService().start();
> ResourceFactory.getResourceChangeScannerService().start();
>
> And the changesets look like this (xsd stuff removed for brevity):
>
> <change-set>
> <add>
> <resource username="ruleclient" password="hunter2"
> basicAuthentication="enabled"
>
> source="http://guvnorhost/drools-guvnor/org.drools.guvnor.Guvnor/package/my.package/LATEST"
> type="PKG" />
> </add>
> </change-set>
>
> As you can see, we use LATEST because we want continuous deployment of 
> our rules. Change a rule, build the package, and have the connected 
> KnowledgeAgents updated with the new rule. This works very well - a 
> bit too well, unfortunately. We have a comprehensive test suite, and 
> every now and then, you'll check in a rule that breaks a test. We want 
> to prevent any changes to our rules from being propagated to the 
> clients until all the tests succeed, and this is where we're stuck.
>
> We've tried using a KnowledgeAgentEventListener which throws an 
> exception when it detects test failures:
>
> public class VetoListener extends DefaultKnowledgeAgentEventListener {
> @Override
> public void beforeChangeSetApplied(BeforeChangeSetAppliedEvent
> event) {
> if (!allTestsPass()) {
> throw new RuntimeException("tests failed, not applying 
> change set");
> }
> }
>
> boolean allTestsPass(){
> // Get test results from
> ${guvnor_url}/org.drools.guvnor.Guvnor/package/my.package/LATEST/SCENARIOS
> // and check if there were any failures
> }
> }
> // Usage:
> knowledgeAgent.addEventListener(new VetoListener());
>
> This does prevent the new changeset from being applied, but it also 
> seems to kill the thread polling for new changes entirely. Restarting 
> the ResourceChange{Scanner,Notifier}Services doesn't help.
>
> I've also tried modifying the event's changeset (I know you 
> shouldn't), but it doesn't stop the changes from being applied:
>
> public void beforeChangeSetApplied(BeforeChangeSetAppliedEvent event) {
> if (!allTestsPass()) {
> event.getChangeSet().getResourcesModified().clear();
> // ... and clear all the other collections you can get 
> from
> event.getChangeSet()
> }
> }
>
> So, what I wonder is if there is any way of preventing a changeset 
> from being applied to a KnowledgeAgent's knowledge base when there are 
> failing test scenarios, but which applies updates as soon as all tests 
> succeed? More generally, I'm looking for something with fewer manual 
> steps than run tests-make snapshot-publish, and in particular I want 
> to ensure you never publish a package when there are tests failing, 
> and it should preferably not require any changes outside of Guvnor to 
> get out new rules to the client app. Any ideas?
>
> Thanks in advance,
>
> /g
>
>
_______________________________________________
rules-users mailing list
rules-users at lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users

_______________________________________________
rules-users mailing list
rules-users at lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20120628/8794ffbb/attachment-0001.html