[rules-users] Resource Change Scanner Service modified date error

[Swindells, Thomas]

As well as the message not making sense the exception should also really be UnsupportedOperationException, of course the preference is for someone to implement it and make it supported!

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Esteban Aliverti
Sent: 06 January 2012 09:14
To: Rules Users List
Subject: Re: [rules-users] Resource Change Scanner Service modified date error

Could you please share with us how are you adding your resources to the agent? According to what you are saying I assume you are using a ReaderResource. According to Drools code, ReaderResource doesn't support most of org.drools.io.internal.InternalResource methods. Some of these methods (i.e. getLastModified()) are used by ResourceScanner to check if a resource has actually changed.
So if we take a look at ReaderResource.getLastModified() we will see this:

public long getLastModified() {
    throw new IllegalStateException( "reader does have a modified date" );
}

You can find the whole source code here: https://github.com/droolsjbpm/drools/blob/master/drools-core/src/main/java/org/drools/io/impl/ReaderResource.java

So, don't expect this to work :)

There are 2 things you can do:

 1.  Submit a patch for ReaderResource.java implementing all the unimplemented methods :)
 2.  Use a different Resource like UrlResource, FileResource, InputStreamResource, etc.
In my opinion, Bug 733008 must be reopened until someone (maybe you Dean) provides a correct implementation of ReaderResource.

Best Regards,

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Esteban Aliverti
- Developer @ http://www.plugtree.com
- Blog @ http://ilesteban.wordpress.com

On Fri, Jan 6, 2012 at 8:53 AM, Dean <dean at qualica.com<mailto:dean at qualica.com>> wrote:
I'm pretty sure this issue is the same as Bug 733008
(https://bugzilla.redhat.com/show_bug.cgi?id=733008).

I have updated the class from Bug 733008 to reproduce the bug in Drools
5.4.0.Beta1:

http://drools.46999.n3.nabble.com/file/n3637279/AgentTest.java
AgentTest.java

It doesn't seem to be possible to scan a resource for changes at all. Even
if I execute ResourceFactory.getResourceChangeScannerService().scan();
directly, I get the same error message:

[2012-01-06 09<tel:%5B2012-01-06%2009>:47:57,144:exception]
java.lang.IllegalStateException: reader does have a modified date
       at
org.drools.io.impl.ReaderResource.getLastModified(ReaderResource.java:64)
       at
org.drools.io.impl.ResourceChangeScannerImpl.scan(ResourceChangeScannerImpl.java:166)
       at
org.drools.io.impl.ResourceChangeScannerImpl$ProcessChangeSet.run(ResourceChangeScannerImpl.java:311)
       at java.lang.Thread.run(Thread.java:662)

(As a side note the error message should probably read: reader does /not/
have a modified date)

Regards

Dean


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