Details
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Type:
Improvement
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Status: Resolved
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: Nightly Builds
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Fix Version/s: None
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Component/s: None
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Labels:None
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Environment:
Operating System: All
Platform: All
Description
This is a proposal to support reloadable configurations in the configuration
descriptor parsed by ConfigurationFactory. I suggest two forms, a complete form
to fine tune the strategy applied to the configuration:
<configuration>
<properties fileName="config.properties">
<reloading-strategy
class="org.apache.commons.configuration.reloading.FileChangedReloadingStrategy">
<param name="refreshDelay" value="30000"/>
</reloading-strategy>
</properties>
</configuration>
and a short form:
<configuration>
<properties fileName="config.properties" reloadable="true"/>
</configuration>
This short form will use a FileChangedReloadingStrategy with the default values.
This form keeps the descriptor simple for those that don't bother fine tuning
the performance of the reloading mechanism.
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With the new DefaultConfigurationBuilder class it is now possible to perform
complex initializations on the declared configuration sources, including
definitions of reloading strategies.
The syntax is not exactly as suggested, but similar. A short form is not
supported yet. Details can be found in the updated user's guide.
Can we close this ticket now?
I am closing this issue now because the requested functionality is available in DefaultConfigurationBuilder.
As I am using the ConfigurationFactory, I am interresting with your idea. here
is what I have done for resolving this problem :
=> The xml has this form
<?xml version="1.0" encoding="ISO-8859-1" ?>
<configuration>
<properties fileName="config.properties"
reloading-strategy="org.apache.commons.configuration.reloading.FileChangedReloadingStrategy"/>
<properties fileName="defaultConfig.properties"/>
</configuration>
As you can see, there is no value for the refresh delay
=> I download the latest version of the ConfigurationFactory class from the SVN
site (with all his dependencies...) and I change the
PropertiesConfigurationFactory class with this code :
protected FileConfiguration createConfiguration(Attributes attributes) throws
Exception
{
String filename = attributes.getValue(ATTR_FILENAME);
// BEGIN HGerard - MACIF
AbstractFileConfiguration tmpConf;
if (filename != null && filename.toLowerCase().trim().endsWith(".xml"))
{ tmpConf = new XMLPropertiesConfiguration(); }else
{ tmpConf = new PropertiesConfiguration(); }String reloadStrat = attributes.getValue(ATTR_RELOADING_STRATEGY);
{ tmpConf.setFileName(filename); tmpConf.setReloadingStrategy((ReloadingStrategy) Class.forName(reloadStrat).newInstance()); }try {
if (reloadStrat != null)
}
{ // no reloading strategy for this time log.error(eI); }catch (InstantiationException eI)
catch (IllegalAccessException eI)
{ // no reloading strategy for this time log.error(eI); }return tmpConf;
// END HGerard - MACIF
}
the ATTR_RELOADING_STRATEGY has been declared as :
/** Constant for the reloading strategy attribute.*/
private static final String ATTR_RELOADING_STRATEGY = "reloading-strategy";
Hope it helps.
Herve