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From Martin Ritchie <ritch...@apache.org>
Subject Re: [CONFIGURATION] Help with optional XML file in override section of configuration builder.
Date Thu, 17 Sep 2009 10:37:02 GMT
2009/9/16 Oliver Heger <oliver.heger@oliver-heger.de>:
> Ralph Goers schrieb:
>>
>> On Sep 16, 2009, at 4:37 AM, Martin Ritchie wrote:
>>
>>>
>>> Oliver,
>>> Thanks for the pointer to use DefaultConfigurationBuilder.
>>>
>>> Whilst this now does not need to have the test.config property defined
>>> or the file existing it does behave differently to the older
>>> ConfigurationFactory.
>>>
>>> With the configuration as shown in the pastie
>>> (http://pastie.org/617143) the ConfigurationFactory builds a single
>>> configuration tree where later elements are overwritten by newer
>>> values.
>>> So given the configuration values shown here: http://pastie.org/618625
>>> The value of tests.store.class in config.xml (MemoryMessageStore) is
>>> overwritten with (SlowMessageStore) from the test.config. The
>>> additional values in the test.config are also propgated in to the
>>> final configuraiton.
>>>
>>> When I changed to use the DefaultConfigurationBuilder the entire
>>> virtualhosts section was overwritten as a result the other virtualhost
>>> sections in config.xml were lost.
>>>
>>> Is there a way I can get the behaviour as seen with the
>>> ConfigurationFactory but have the file parsing/loading of the
>>> DefaultConfigurationBuilder?
>>>
>> What you are experiencing is probably a result of the NodeCombiner being
>> used. In trunk you will find a "MergeCombiner" that may behave the way you
>> want it to. If you build trunk you should look at the updated documentation
>> as it provides some documentation on how the 3 combiners work and what
>> results they will produce in various situations.
>>
>> Ralph
>>
>
> The problem may also be related to the handling of list nodes. [1] contains
> a discussion about NodeCombiners used when constructing a combined
> configuration (which is done under the hood by DefaultConfigurationBuilder).
> It also mentions possible problems when dealing with list structures.
>
> In the description of the configuration definition file for
> DefaultConfigurationBuilder [2] it is explained how list nodes can be
> specified.
>
> Oliver
>
>
> [1]
> http://commons.apache.org/configuration/userguide/howto_combinedconfiguration.html#Node%20combiners
>
> [2]
> http://commons.apache.org/configuration/userguide/howto_configurationbuilder.html#Enhancements_of_the_configuration_definition_file
>
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Thanks for your suggestions Ralph and Oliver. I'll take a look at what
we are doing.

Cheers

Martin


-- 
Martin Ritchie

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