Configure Xtext generator at runtime - eclipse

Question

I have implemented with Xtext a DSL, and I'm trying to find a way to configure dynamically the generation of code in mydsl.ui Eclipse plugin.
I introduced a preference parameter in order to configure generator.
I injected a custom GeneratorConfiguration object with MyDslRuntimeModule
Then I set the preference parameter in this object in "build" method of a custom BuilderParticipant (configured in plugin.xml).
// In mydsl plugin
class MyDslRuntimeModule extends AbstractMyDslRuntimeModule {
def Class<? extends IGeneratorConfiguration> bindIGeneratorConfiguration() {
return GeneratorConfiguration;
}
}
// In mydsl.ui plugin
package mydsl.ui;
public class MyBuildPartecipant extends BuilderParticipant {
#Inject IGeneratorConfiguration generatorConfiguration;
#Override
public void build(IBuildContext context, IProgressMonitor monitor) throws CoreException {
ScopedPreferenceStore scopedPreferenceStore = new ScopedPreferenceStore(InstanceScope.INSTANCE, "ID");
generatorConfiguration.setGeneratorProperty(scopedPreferenceStore.getInt("myDslProperty"));
super.build(context, monitor);
}
// In mydsl plugin
class MyDslGenerator extends AbstractGenerator {
#Inject IGeneratorConfiguration generatorConfiguration;
override void doGenerate(Resource resource, IFileSystemAccess2 fsa, IGeneratorContext context) {
println("Compiling with " + generatorConfiguration.generatorProperty)
The result is that the GeneratorConfiguration object obtained via #Inject decorator in class MyBuildPartecipant of mydsl.ui plugin (eclipse ui) is different from that obtained in class MyDslGenerator of mydsl plugin (Xtext generator plugin).
How can I pass a parameter from eclipse ui plugin to Xtext generator plugin (non ui plugin) in order to configure dynamically the code generation?
Thanks
Paolo

Answer 1

I solved with:
// In mydsl plugin
class MyDslRuntimeModule extends AbstractMyDslRuntimeModule {
def IGeneratorConfiguration bindIGeneratorConfiguration() {
return new GeneratorConfiguration();
}

Answer 2

you should mark the GeneratorConfiguration class with #Singleton.
or add a singleton binding using a configure method
def void configureIGeneratorConfiguration(Binder binder) {
binder.bind(IGeneratorConfiguration).to(GeneratorConfiguration).in(Scopes.SINGLETON)
}
or annotate the class binding with #SingletonBinding
#SingletonBinding
def Class<? extends IGeneratorConfiguration> bindIGeneratorConfiguration() {
GeneratorConfiguration
}
the way you do it wont work if you inject stuff into the GeneratorConfiguration class