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

[Wolfgang Laun]

Enlighten me, please.

If ResourceFactory.newReaderResource() creates a drools.io.Resource from a
java.io.Reader, how would you get at some modification time, and of what?

The general idea of a Reader seems to be a data source without implication
as to data representation, persistence, file system or any other such thing.

-W


2012/1/6 Esteban Aliverti <esteban.aliverti at gmail.com>

> +1 to Thomas' proposal: the first step would be to change the thrown
> Exception to UnsupportedOperationException. Of course this will be a
> temporary change until Dean implements all the methods in the correct way
> :)
>
> Best Regards
>
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Developer @ http://www.plugtree.com
> - Blog @ http://ilesteban.wordpress.com
>
>
> 2012/1/6 Swindells, Thomas <TSwindells at nds.com>
>
>  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> 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 09:47:57,144: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
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/Resource-Change-Scanner-Service-modified-date-error-tp3634802p3637279.html
>> ****
>>
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users****
>>
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