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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CONFIGURATION-523) DefaultConfigurationBuilder is not reloading its base file
Date Mon, 21 Jan 2013 21:14:12 GMT

    [ https://issues.apache.org/jira/browse/CONFIGURATION-523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559105#comment-13559105
] 

Oliver Heger commented on CONFIGURATION-523:
--------------------------------------------

Hm, it seems that the support for reloading the definition file of a {{DefaultConfigurationBuilder}}
is quite limited. The problem is that a reload check is only performed when a property of
a configuration is accessed. But this is typically not the case for a {{DefaultConfigurationBuilder}}
after it has created its result configuration.

A workaround may be to query a synthetic property on the builder to manually trigger a reload
check. But then you also have to find out whether a reload actually happened and - if so -
query the builder for a new configuration.

That said, there is currently work going on for a version 2.0 of Configuration, and one area
which is to be improved is reloading support (see also CONFIGURATION-520). There is already
some code in SVN which allows for periodic, timer-based reload checks. It will also work for
a {{CombinedConfigurationBuilder}} (which is the replacement for {{DefaultConfigurationBuilder}}
in 2.0). However, unfortunately, this is all work in progress and still in an early stage.
                
> DefaultConfigurationBuilder is not reloading its base file
> ----------------------------------------------------------
>
>                 Key: CONFIGURATION-523
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-523
>             Project: Commons Configuration
>          Issue Type: Bug
>          Components: File reloading
>    Affects Versions: 1.9
>         Environment: Windows / Eclipse
>            Reporter: Jean-Marc
>            Priority: Critical
>              Labels: DefaultConfigurationBuilder, reloading
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> Create a DefaultConfigurationBuilder with this example file master-config.xml :
> <?xml version="1.0" encoding="UTF-8" ?>
> <configuration>
> 	<header>
> 		<result forceReloadCheck="true"/>
> 	</header>
> 	<system/>
> 	<override>
> 		<properties fileName="webapp-commons.properties"  throwExceptionOnMissing="true">
> 			<reloadingStrategy refreshDelay="1000" config-class="org.apache.commons.configuration.reloading.FileChangedReloadingStrategy"/>
	
> 		</properties>
> 	</override>
> </configuration>
> A modification to "webapp-commons.properties" is well detected and the file is reloaded.
> But if you modify the master-config.xml itself, nothing is reloaded, no event are thrown.

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