It is not possible.
However, you can initialize a symbol with another symbol's value:
configuration.add("my.new.symbol", "${some.other.symbol}")
Tapestry does a good job of detecting and reporting any unintentional
cycles you might create this way.
On Tue, Jan 3, 2012 at 7:59 AM, Borut Bolčina <borut.bolc...@gmail.com> wrote:
> Hi,
>
> I would still like an advice on the approach on how to initialize custom
> symbol provider with tapestry provided symbol. The code below ends in
> IllegalStateException
>
> Construction of service 'SymbolSource' has failed due to recursion: the
> service depends on itself in some way.
>
>
> The code from AppModule:
>
> public RESTSymbolProvider buildRESTSymbolProvider(Logger logger,
> @Inject @Symbol(SymbolConstants.EXECUTION_MODE) String executionMode) {
> return new RESTSymbolProvider(logger, executionMode);
> }
>
> public void contributeSymbolSource(OrderedConfiguration<SymbolProvider>
> providers, Logger logger,
> @InjectService("RESTSymbolProvider") SymbolProvider
> restSymbolProvider) {
> providers.add("myAppConfiguration", restSymbolProvider);
> }
>
> Thanks for any input,
> borut
>
> 2011/12/30 Borut Bolčina <borut.bolc...@gmail.com>
>
>> Hello,
>>
>> I am in a process of writting my own SymbolProvider (the configuration for
>> my app will come from REST service) and I am facing a dilemma. The
>> contribution looks like:
>>
>> public void
>> contributeSymbolSource(OrderedConfiguration<SymbolProvider> providers,
>> Logger logger) {
>> providers.add("myAppConfiguration", new RESTSymbolProvider(logger,
>> "development"), "after:SystemProperties", "before:ApplicationDefaults");
>> }
>>
>> You can see I hardcoded the string "development". I want to replace this
>> string with another symbol
>>
>> @Symbol(SymbolConstants.EXECUTION_MODE) String executionMode
>>
>> As I need this symbol in another method (sendEmailMessage) in the
>> AppModule I naively tried like this and failed:
>>
>> public class AppModule {
>>
>> private String *executionMode*;
>>
>> public AppModule(@Symbol(SymbolConstants.EXECUTION_MODE) String
>> executionMode) {
>> this.executionMode = executionMode;
>> }
>>
>> @Startup
>> public void sendEmailMessage(Logger logger) {
>> if ("development".equals(*executionMode*)) {
>> logger.info(MarkerFactory.getMarker("EDITORS"), "DEVELOPMENT
>> Starting najdi-web");
>> } else {
>> logger.info(MarkerFactory.getMarker("EDITORS"), "PRODUCTION
>> Starting najdi-web");
>> }
>> }
>>
>> public void
>> contributeSymbolSource(OrderedConfiguration<SymbolProvider> providers,
>> Logger logger) {
>> providers.add("myAppConfiguration", new RESTSymbolProvider(logger,
>> *executionMode*), "after:SystemProperties", "before:ApplicationDefaults");
>> }
>> ...
>> }
>>
>>
>> Fails with:
>>
>> [2011/12/30 14:59:04.537] ERROR [o.a.t.i.Registry:log]: Construction of
>> service 'SymbolSource' has failed due to recursion: the service depends on
>> itself in some way. Please check
>> org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl(List) (at
>> SymbolSourceImpl.java:198) via
>> org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at
>> TapestryIOCModule.java:49) for references to another service that is itself
>> dependent on service 'SymbolSource'.
>> [2011/12/30 14:59:04.538] ERROR [o.a.t.i.Registry:log]: Operations trace:
>> [2011/12/30 14:59:04.539] ERROR [o.a.t.i.Registry:log]: [ 1] Realizing
>> service ServletApplicationInitializer
>> [2011/12/30 14:59:04.539] ERROR [o.a.t.i.Registry:log]: [ 2] Instantiating
>> service ServletApplicationInitializer implementation via
>> org.apache.tapestry5.services.TapestryModule.buildServletApplicationInitializer(Logger,
>> List, ApplicationInitializer) (at TapestryModule.java:1395)
>> [2011/12/30 14:59:04.540] ERROR [o.a.t.i.Registry:log]: [ 3] Constructing
>> module class org.apache.tapestry5.services.TapestryModule
>> [2011/12/30 14:59:04.540] ERROR [o.a.t.i.Registry:log]: [ 4] Determining
>> injection value for parameter #1
>> (org.apache.tapestry5.ioc.services.PipelineBuilder)
>> [2011/12/30 14:59:04.541] ERROR [o.a.t.i.Registry:log]: [ 5] Resolving
>> object of type org.apache.tapestry5.ioc.services.PipelineBuilder using
>> MasterObjectProvider
>> [2011/12/30 14:59:04.541] ERROR [o.a.t.i.Registry:log]: [ 6] Realizing
>> service ServiceOverride
>> [2011/12/30 14:59:04.542] ERROR [o.a.t.i.Registry:log]: [ 7] Instantiating
>> service ServiceOverride implementation via
>> org.apache.tapestry5.ioc.internal.services.ServiceOverrideImpl(Map) (at
>> ServiceOverrideImpl.java:31) via
>> org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at
>> TapestryIOCModule.java:49)
>> [2011/12/30 14:59:04.542] ERROR [o.a.t.i.Registry:log]: [ 8] Creating plan
>> to instantiate
>> org.apache.tapestry5.ioc.internal.services.ServiceOverrideImpl via public
>> org.apache.tapestry5.ioc.internal.services.ServiceOverrideImpl(java.util.Map)
>> [2011/12/30 14:59:04.543] ERROR [o.a.t.i.Registry:log]: [ 9] Determining
>> injection value for parameter #1 (java.util.Map)
>> [2011/12/30 14:59:04.544] ERROR [o.a.t.i.Registry:log]: [10] Collecting
>> mapped configuration for service ServiceOverride
>> [2011/12/30 14:59:04.544] ERROR [o.a.t.i.Registry:log]: [11] Invoking
>> org.apache.tapestry5.services.TapestryModule.productionModeOverrides(MappedConfiguration,
>> boolean) (at TapestryModule.java:2871)
>> [2011/12/30 14:59:04.545] ERROR [o.a.t.i.Registry:log]: [12] Determining
>> injection value for parameter #2 (boolean)
>> [2011/12/30 14:59:04.545] ERROR [o.a.t.i.Registry:log]: [13] Resolving
>> object of type boolean using MasterObjectProvider
>> [2011/12/30 14:59:04.546] ERROR [o.a.t.i.Registry:log]: [14] Realizing
>> service SymbolSource
>> [2011/12/30 14:59:04.546] ERROR [o.a.t.i.Registry:log]: [15] Instantiating
>> service SymbolSource implementation via
>> org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl(List) (at
>> SymbolSourceImpl.java:198) via
>> org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at
>> TapestryIOCModule.java:49)
>> [2011/12/30 14:59:04.547] ERROR [o.a.t.i.Registry:log]: [16] Creating plan
>> to instantiate org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl
>> via public
>> org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl(java.util.List)
>> [2011/12/30 14:59:04.547] ERROR [o.a.t.i.Registry:log]: [17] Determining
>> injection value for parameter #1 (java.util.List)
>> [2011/12/30 14:59:04.548] ERROR [o.a.t.i.Registry:log]: [18] Collecting
>> ordered configuration for service SymbolSource
>> [2011/12/30 14:59:04.548] ERROR [o.a.t.i.Registry:log]: [19] Invoking
>> si.najdi.web.services.AppModule.contributeSymbolSource(OrderedConfiguration,
>> Logger) (at AppModule.java:40)
>> [2011/12/30 14:59:04.549] ERROR [o.a.t.i.Registry:log]: [20] Constructing
>> module class si.najdi.web.services.AppModule
>> [2011/12/30 14:59:04.550] ERROR [o.a.t.i.Registry:log]: [21] Determining
>> injection value for parameter #1 (java.lang.String)
>> [2011/12/30 14:59:04.550] ERROR [o.a.t.i.Registry:log]: [22] Resolving
>> object of type java.lang.String using MasterObjectProvider
>> [2011/12/30 14:59:04.551] ERROR [o.a.t.i.Registry:log]: [23] Realizing
>> service SymbolSource
>> [2011/12/30 14:59:04.569] ERROR [o.a.t.i.s.T.SymbolSource:createObject]:
>> Construction of service SymbolSource failed: Unable to instantiate class
>> si.najdi.web.services.AppModule as a module: Exception constructing service
>> 'SymbolSource': Construction of service 'SymbolSource' has failed due to
>> recursion: the service depends on itself in some way. Please check
>> org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl(List) (at
>> SymbolSourceImpl.java:198) via
>> org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at
>> TapestryIOCModule.java:49) for references to another service that is itself
>> dependent on service 'SymbolSource'.
>> java.lang.RuntimeException: Unable to instantiate class
>> si.najdi.web.services.AppModule as a module: Exception constructing service
>> 'SymbolSource': Construction of service 'SymbolSource' has failed due to
>> recursion: the service depends on itself in some way. Please check
>> org.apache.tapestry5.ioc.internal.services.SymbolSourceImpl(List) (at
>> SymbolSourceImpl.java:198) via
>> org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at
>> TapestryIOCModule.java:49) for references to another service that is itself
>> dependent on service 'SymbolSource'.
>>
>> Am I facing multiple problems here?
>>
>> Regards,
>> borut
>>
--
Howard M. Lewis Ship
Creator of Apache Tapestry
The source for Tapestry training, mentoring and support. Contact me to
learn how I can get you up and productive in Tapestry fast!
(971) 678-5210
http://howardlewisship.com
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