Ratpack: bind object instance to Guice registry

RatpackBindObjectInstance.md

Binding object instances as singletons

To bind object instance to be accessible accross handlers and custom classes define module and provider method. Add @Singleton annotation to have one instance for all injections.

import com.google.inject.AbstractModule
import com.google.inject.Scopes
import com.google.inject.Provides
import com.google.inject.Singleton

class CallerModule extends AbstractModule {
  protected void configure() {
    bind(CallerService.class).in(Scopes.SINGLETON)
  }
  
  @Provides @Singleton
  void provideCtx() {
    return new CallerCtx()
  }
}

Then in handler you have access to this CallerCtx class instance.

ratpack {
  bindings {
    add new CallerModule()
  }
  
  handlers {
    handler { CallerCtx cCtx, PublicAddress publicAddress ->
      if (cCtx && !cCtx.serverUrl) {
        cCtx.serverUrl = publicAddress.getAddress(context).toString()
      }
    }
    
    post("call") { CallerCtx cCtx ->
      
    }
  }
}

The same instance of CallerCtx class is accessible from inside custom class:

import javax.inject.Inject

class CallerService {
  @Inject CallerCtx cCtx
}

Thanks!