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From: Martin Gainty <mgainty@hotmail.com>
To: Commons Users List <user@commons.apache.org>
Subject: RE: [configuration] Calling getConfiguration on
 DefaultConfigurationBuilder more than once permitted
Date: Fri, 21 Mar 2014 21:17:44 -0400
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 =20


> Date: Fri=2C 21 Mar 2014 22:45:29 +0100
> From: dont_know@gmx.net
> To: user@commons.apache.org
> Subject: [configuration] Calling getConfiguration on DefaultConfiguration=
Builder more than once permitted
>=20
> Hi=2C
>=20
> is it permitted to call getConfiguration more than once on the same=20
> instance of DefaultConfigurationBuilder like this:
>=20
> DefaultConfigurationBuilder builder =3D new DefaultConfigurationBuilder()=
=3B
> builder.setFile(new File("config.xml"))=3B
> Configuration config =3D builder.getConfiguration(true)=3B
> config =3D builder.getConfiguration(true)=3B
> config =3D builder.getConfiguration(true)=3B
> ...
>=20
> The config.xml looks like this:
> <?xml version=3D"1.0" encoding=3D"ISO-8859-1" ?>
>=20
> <configuration>
> <properties fileName=3D"test.properties" config-at=3D"a"/>
> <properties fileName=3D"test.properties" config-at=3D"b"/>
> <properties fileName=3D"test.properties" config-at=3D"c"/>
> <properties fileName=3D"test.properties" config-at=3D"d"/>
> <properties fileName=3D"test.properties" config-at=3D"e"/>
> <properties fileName=3D"test.properties" config-at=3D"f"/>
> <properties fileName=3D"test.properties" config-at=3D"g"/>
> <properties fileName=3D"test.properties" config-at=3D"h"/>
> <properties fileName=3D"test.properties" config-at=3D"i"/>
> <properties fileName=3D"test.properties" config-at=3D"j"/>
> </configuration>
>=20
> and the referenced file "test.properties" contains:
> a=3Da
> b=3Db
> c=3Dc
>=20
> I asked this question=2C because with the first call of getConfiguration=
=20
> the "test.properties"-file is read 10 times (once for every=20
> "config-at")=2C with the second call 20 times=2C with the third call 30=20
> times and so on. So in the end the program slows down and after 100=20
> calls it needs 200ms to read the properties.
=20
MG>builder.getConfiguration(true) a Union between one DB Table and another =
DB Table
MG>if you want to 'merge' 2 groups together I suggest using OverrideCombine=
r
MG>ConfigurationNode combine(ConfigurationNode node1=2C      ConfigurationN=
ode node2)
MG> http://www.docjar.com/html/api/org/apache/commons/configuration/tree/Ov=
errideCombiner.java.html
>=20
> I'm a little bit confused because my idea was to instantiate=20
> DefaultConfigurationBuilder for performance reasons only once (as a=20
> Singleton) and call getConfiguration subsequently to read "fresh"=20
> properties.
>=20
> Thanks
> Stefan
>=20
>=20
> ---------------------------------------------------------------------
> To unsubscribe=2C e-mail: user-unsubscribe@commons.apache.org
> For additional commands=2C e-mail: user-help@commons.apache.org
>=20
 		 	   		  =

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