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Default value for symbol
by locutuz
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Hi everyone,
I have a contribution where an attribute is defined with a symbol, see below: <config myNewAttribute="${my.new.symbol}" ... To fill this symbol with data at runtime, there is a properties file (myProps.properties) my.new.symbol=The value So far this works fine. But there are some cases, where this properties file doesn´t exist already, so at runtime an error message appears, telling me that there is no value for that symbol (org.apache.hivemind.impl.SymbolExpander : Error at...META-INF/hivemodule.xml, line 146, column 7: No value available for symbol 'my.new.symbol'.). Off course not, because the properties file doesn´t exist where the value is get from. My question is, if there is a possibility to set a default-value for a symbol, if it can´t be expanded by the SymbolExpander? I tried to set the value with the <default> element. <contribution configuration-id="hivemind.ApplicationDefaults"> <default symbol="my.new.symbol" value="DEFAULT" /> </contribution> The problem here is, that at runtime the value for 'myNewAttribute' is 'DEFAULT' in any case, regardless if the value can be read from the properties file. i.e. if the symbol should be expanded by the SymbolExpander. Thanks for your help in advance! Regards, Sebastian |
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Re: Default value for symbol
by Davor Hrg
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contributing to ApplicationDefaults is the way to go,
you just need to make sure your symbolSource is called before ApplicationDefaults for example look at : http://hivemind.apache.org/hivemind1/hivedocs/config/hivemind.SymbolSources.html <source before="hivemind.FactoryDefaults" name="hivemind.ApplicationDefaults" service-id="ApplicationDefaultsSymbolSource" /> <source name="hivemind.FactoryDefaults" service-id="FactoryDefaultsSymbolSource" /> add your symbol source like this <source before="hivemind.ApplicationDefaults" name="MySource" service-id="MySymbolSource" /> Hrg On 10/17/07, locutuz <Sebastian.Klein@...> wrote:
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Re: Default value for symbol
by jwcarman
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Actually, you don't need to define your own source. You need to
provide a factory default. Then, if that needs to be overridden, it would be overridden with an application default. On 10/17/07, Davor Hrg <hrgdavor@...> wrote: > contributing to ApplicationDefaults is the way to go, > you just need to make sure your symbolSource is called before > ApplicationDefaults > > for example > look at : > http://hivemind.apache.org/hivemind1/hivedocs/config/hivemind.SymbolSources.html > > <source before="hivemind.FactoryDefaults" > name="hivemind.ApplicationDefaults" > service-id="ApplicationDefaultsSymbolSource" /> > <source name="hivemind.FactoryDefaults" > service-id="FactoryDefaultsSymbolSource" /> > > > add your symbol source like this > <source before="hivemind.ApplicationDefaults" name="MySource" > service-id="MySymbolSource" /> > > > Hrg > > > On 10/17/07, locutuz <Sebastian.Klein@...> > wrote: > > > > Hi everyone, > > > > I have a contribution where an attribute is defined with a symbol, see > > below: > > > > <config myNewAttribute="${my.new.symbol}" ... > > > > > > To fill this symbol with data at runtime, there is a properties file > > (myProps.properties) > > my.new.symbol=The value > > > > So far this works fine. > > But there are some cases, where this properties file doesn´t exist > already, > > so at runtime an error message appears, telling me that there is no value > > for that symbol > > (org.apache.hivemind.impl.SymbolExpander : Error > > at...META-INF/hivemodule.xml, line 146, column 7: No value available for > > symbol 'my.new.symbol'.). > > > > Off course not, because the properties file doesn´t exist where the value > is > > get from. > > My question is, if there is a possibility to set a default-value for a > > symbol, if it can´t be expanded by the SymbolExpander? > > > > I tried to set the value with the <default> element. > > <contribution configuration-id="hivemind.ApplicationDefaults"> > > <default symbol=" my.new.symbol" value="DEFAULT" /> > > </contribution> > > > > The problem here is, that at runtime the value for 'myNewAttribute' is > > 'DEFAULT' in any case, regardless if the value can be read from the > > properties file. i.e. if the symbol should be expanded by the > > SymbolExpander. > > > > Thanks for your help in advance! > > > > Regards, > > Sebastian > > > > -- > > View this message in context: > http://www.nabble.com/Default-value-for-symbol-tf4639273.html#a13250295 > > Sent from the Hivemind - User mailing list archive at Nabble.com. > > > > > > |
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Re: Default value for symbol
by Davor Hrg
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I understood that another symbol source is used...
quote: >To fill this symbol with data at runtime, there is a properties file >(myProps.properties) >my.new.symbol=The value and that value contributed to ApplicationDefaults was not overriden with one from that source. Davor Hrg On 10/17/07,
James Carman <james@...> wrote: Actually, you don't need to define your own source. You need to |
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Re: Default value for symbol
by jwcarman
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I see what you mean, but the way the situation should be handled would
be with a factory default. On 10/17/07, Davor Hrg <hrgdavor@...> wrote: > I understood that another symbol source is used... > > quote: > >To fill this symbol with data at runtime, there is a properties file > >(myProps.properties) > >my.new.symbol=The value > > and that value contributed to ApplicationDefaults was not overriden > with one from that source. > > Davor Hrg > > > On 10/17/07, James Carman <james@...> wrote: > > Actually, you don't need to define your own source. You need to > > provide a factory default. Then, if that needs to be overridden, it > > would be overridden with an application default. > > > > On 10/17/07, Davor Hrg < hrgdavor@...> wrote: > > > contributing to ApplicationDefaults is the way to go, > > > you just need to make sure your symbolSource is called before > > > ApplicationDefaults > > > > > > for example > > > look at : > > > > http://hivemind.apache.org/hivemind1/hivedocs/config/hivemind.SymbolSources.html > > > > > > <source before="hivemind.FactoryDefaults" > > > name="hivemind.ApplicationDefaults" > > > service-id="ApplicationDefaultsSymbolSource" /> > > > <source name=" hivemind.FactoryDefaults" > > > service-id="FactoryDefaultsSymbolSource" /> > > > > > > > > > add your symbol source like this > > > <source before="hivemind.ApplicationDefaults" name="MySource" > > > service-id="MySymbolSource" /> > > > > > > > > > Hrg > > > > > > > > > On 10/17/07, locutuz > <Sebastian.Klein@... > > > > wrote: > > > > > > > > Hi everyone, > > > > > > > > I have a contribution where an attribute is defined with a symbol, see > > > > below: > > > > > > > > <config myNewAttribute="${ my.new.symbol}" ... > > > > > > > > > > > > To fill this symbol with data at runtime, there is a properties file > > > > (myProps.properties) > > > > my.new.symbol=The value > > > > > > > > So far this works fine. > > > > But there are some cases, where this properties file doesn´t exist > > > already, > > > > so at runtime an error message appears, telling me that there is no > value > > > > for that symbol > > > > ( org.apache.hivemind.impl.SymbolExpander : Error > > > > at...META-INF/hivemodule.xml, line 146, column 7: No value available > for > > > > symbol 'my.new.symbol'.). > > > > > > > > Off course not, because the properties file doesn´t exist where the > value > > > is > > > > get from. > > > > My question is, if there is a possibility to set a default-value for a > > > > symbol, if it can´t be expanded by the SymbolExpander? > > > > > > > > I tried to set the value with the <default> element. > > > > <contribution configuration-id="hivemind.ApplicationDefaults"> > > > > <default symbol=" my.new.symbol" value="DEFAULT" /> > > > > </contribution> > > > > > > > > The problem here is, that at runtime the value for 'myNewAttribute' is > > > > 'DEFAULT' in any case, regardless if the value can be read from the > > > > properties file. i.e. if the symbol should be expanded by the > > > > SymbolExpander. > > > > > > > > Thanks for your help in advance! > > > > > > > > Regards, > > > > Sebastian > > > > > > > > -- > > > > View this message in context: > > > > http://www.nabble.com/Default-value-for-symbol-tf4639273.html#a13250295 > > > > Sent from the Hivemind - User mailing list archive at Nabble.com. > > > > > > > > > > > > > > > > > > |
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Re: Default value for symbol
by Johan Maasing-2
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As both Davor and james said, chain needs to be set up correctly so that
propertiesfile->appdefaults->factorydefaults This is done with before and after attributes. But I guess what James is saying is that the default value should belong in factory-defaults since you might want to override it in an application default even if the properties-file does not exists. Is that correct? On 10/17/07, James Carman <james@...> wrote: > I see what you mean, but the way the situation should be handled would > be with a factory default. > > On 10/17/07, Davor Hrg <hrgdavor@...> wrote: > > I understood that another symbol source is used... > > > > quote: > > >To fill this symbol with data at runtime, there is a properties file > > >(myProps.properties) > > >my.new.symbol=The value > > > > and that value contributed to ApplicationDefaults was not overriden > > with one from that source. > > > > Davor Hrg > > > > > > On 10/17/07, James Carman <james@...> wrote: > > > Actually, you don't need to define your own source. You need to > > > provide a factory default. Then, if that needs to be overridden, it > > > would be overridden with an application default. > > > > > > On 10/17/07, Davor Hrg < hrgdavor@...> wrote: > > > > contributing to ApplicationDefaults is the way to go, > > > > you just need to make sure your symbolSource is called before > > > > ApplicationDefaults > > > > > > > > for example > > > > look at : > > > > > > http://hivemind.apache.org/hivemind1/hivedocs/config/hivemind.SymbolSources.html > > > > > > > > <source before="hivemind.FactoryDefaults" > > > > name="hivemind.ApplicationDefaults" > > > > service-id="ApplicationDefaultsSymbolSource" /> > > > > <source name=" hivemind.FactoryDefaults" > > > > service-id="FactoryDefaultsSymbolSource" /> > > > > > > > > > > > > add your symbol source like this > > > > <source before="hivemind.ApplicationDefaults" name="MySource" > > > > service-id="MySymbolSource" /> > > > > > > > > > > > > Hrg > > > > > > > > > > > > On 10/17/07, locutuz > > <Sebastian.Klein@... > > > > > wrote: > > > > > > > > > > Hi everyone, > > > > > > > > > > I have a contribution where an attribute is defined with a symbol, see > > > > > below: > > > > > > > > > > <config myNewAttribute="${ my.new.symbol}" ... > > > > > > > > > > > > > > > To fill this symbol with data at runtime, there is a properties file > > > > > (myProps.properties) > > > > > my.new.symbol=The value > > > > > > > > > > So far this works fine. > > > > > But there are some cases, where this properties file doesn´t exist > > > > already, > > > > > so at runtime an error message appears, telling me that there is no > > value > > > > > for that symbol > > > > > ( org.apache.hivemind.impl.SymbolExpander : Error > > > > > at...META-INF/hivemodule.xml, line 146, column 7: No value available > > for > > > > > symbol 'my.new.symbol'.). > > > > > > > > > > Off course not, because the properties file doesn´t exist where the > > value > > > > is > > > > > get from. > > > > > My question is, if there is a possibility to set a default-value for a > > > > > symbol, if it can´t be expanded by the SymbolExpander? > > > > > > > > > > I tried to set the value with the <default> element. > > > > > <contribution configuration-id="hivemind.ApplicationDefaults"> > > > > > <default symbol=" my.new.symbol" value="DEFAULT" /> > > > > > </contribution> > > > > > > > > > > The problem here is, that at runtime the value for 'myNewAttribute' is > > > > > 'DEFAULT' in any case, regardless if the value can be read from the > > > > > properties file. i.e. if the symbol should be expanded by the > > > > > SymbolExpander. > > > > > > > > > > Thanks for your help in advance! > > > > > > > > > > Regards, > > > > > Sebastian > > > > > > > > > > -- > > > > > View this message in context: > > > > > > http://www.nabble.com/Default-value-for-symbol-tf4639273.html#a13250295 > > > > > Sent from the Hivemind - User mailing list archive at Nabble.com. > > > > > > > > > > > > > > > > > > > > > > > > > > |
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Re: Default value for symbol
by jwcarman
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Yes, that's what I'm saying. Typically, "framework" authors will use
factory defaults if there are reasonable defaults for their symbols. Then, individual applications that use that framework are free to override those symbols using application defaults. For example, in my HiveMind/Acegi library, I set a factory default to say that the affirmative-based decision manager should be used by default: <contribution configuration-id="hivemind.FactoryDefaults"> <default symbol="hivemind.acegi.decisionManagerClass" value="org.acegisecurity.vote.AffirmativeBased"/> </contribution> However, any other application can override that by doing: <contribution configuration-id="hivemind.ApplicationDefaults"> <default symbol="hivemind.acegi.decisionManagerClass" value="someOtherDecisionManagerClass" /> </contribution> On 10/17/07, Johan Maasing <jmaasing@...> wrote: > As both Davor and james said, chain needs to be set up correctly so that > propertiesfile->appdefaults->factorydefaults > This is done with before and after attributes. > > But I guess what James is saying is that the default value should > belong in factory-defaults since you might want to override it in an > application default even if the properties-file does not exists. Is > that correct? > > > On 10/17/07, James Carman <james@...> wrote: > > I see what you mean, but the way the situation should be handled would > > be with a factory default. > > > > On 10/17/07, Davor Hrg <hrgdavor@...> wrote: > > > I understood that another symbol source is used... > > > > > > quote: > > > >To fill this symbol with data at runtime, there is a properties file > > > >(myProps.properties) > > > >my.new.symbol=The value > > > > > > and that value contributed to ApplicationDefaults was not overriden > > > with one from that source. > > > > > > Davor Hrg > > > > > > > > > On 10/17/07, James Carman <james@...> wrote: > > > > Actually, you don't need to define your own source. You need to > > > > provide a factory default. Then, if that needs to be overridden, it > > > > would be overridden with an application default. > > > > > > > > On 10/17/07, Davor Hrg < hrgdavor@...> wrote: > > > > > contributing to ApplicationDefaults is the way to go, > > > > > you just need to make sure your symbolSource is called before > > > > > ApplicationDefaults > > > > > > > > > > for example > > > > > look at : > > > > > > > > http://hivemind.apache.org/hivemind1/hivedocs/config/hivemind.SymbolSources.html > > > > > > > > > > <source before="hivemind.FactoryDefaults" > > > > > name="hivemind.ApplicationDefaults" > > > > > service-id="ApplicationDefaultsSymbolSource" /> > > > > > <source name=" hivemind.FactoryDefaults" > > > > > service-id="FactoryDefaultsSymbolSource" /> > > > > > > > > > > > > > > > add your symbol source like this > > > > > <source before="hivemind.ApplicationDefaults" name="MySource" > > > > > service-id="MySymbolSource" /> > > > > > > > > > > > > > > > Hrg > > > > > > > > > > > > > > > On 10/17/07, locutuz > > > <Sebastian.Klein@... > > > > > > wrote: > > > > > > > > > > > > Hi everyone, > > > > > > > > > > > > I have a contribution where an attribute is defined with a symbol, see > > > > > > below: > > > > > > > > > > > > <config myNewAttribute="${ my.new.symbol}" ... > > > > > > > > > > > > > > > > > > To fill this symbol with data at runtime, there is a properties file > > > > > > (myProps.properties) > > > > > > my.new.symbol=The value > > > > > > > > > > > > So far this works fine. > > > > > > But there are some cases, where this properties file doesn´t exist > > > > > already, > > > > > > so at runtime an error message appears, telling me that there is no > > > value > > > > > > for that symbol > > > > > > ( org.apache.hivemind.impl.SymbolExpander : Error > > > > > > at...META-INF/hivemodule.xml, line 146, column 7: No value available > > > for > > > > > > symbol 'my.new.symbol'.). > > > > > > > > > > > > Off course not, because the properties file doesn´t exist where the > > > value > > > > > is > > > > > > get from. > > > > > > My question is, if there is a possibility to set a default-value for a > > > > > > symbol, if it can´t be expanded by the SymbolExpander? > > > > > > > > > > > > I tried to set the value with the <default> element. > > > > > > <contribution configuration-id="hivemind.ApplicationDefaults"> > > > > > > <default symbol=" my.new.symbol" value="DEFAULT" /> > > > > > > </contribution> > > > > > > > > > > > > The problem here is, that at runtime the value for 'myNewAttribute' is > > > > > > 'DEFAULT' in any case, regardless if the value can be read from the > > > > > > properties file. i.e. if the symbol should be expanded by the > > > > > > SymbolExpander. > > > > > > > > > > > > Thanks for your help in advance! > > > > > > > > > > > > Regards, > > > > > > Sebastian > > > > > > > > > > > > -- > > > > > > View this message in context: > > > > > > > > http://www.nabble.com/Default-value-for-symbol-tf4639273.html#a13250295 > > > > > > Sent from the Hivemind - User mailing list archive at Nabble.com. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > |
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Re: Default value for symbol
by locutuz
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Thanks everyone for your help.
The chain of the symbol sources wasn´t correct. This way it works fine: <contribution configuration-id="hivemind.SymbolSources"> <source name="PropertiesSymbolSource" class="my.test.PropertiesSymbolSource" before="hivemind.ApplicationDefaults"/> </contribution> I decided to put the default value in the ApplicationDefaults, because I don´t expect that this value has to be changed by an individual application. <contribution configuration-id="hivemind.ApplicationDefaults"> <default symbol="my.new.symbol" value="DEFAULT" /> </contribution> Thanks again. Regards, Sebastian
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