Binding with multiple configurations ( Robots leg ? )

[James]

I'm trying to use Guice to bind various processor classes where each processor takes a config object ( country specific ) and can operator on that county. 

interface Config

    {

        String getName();

    }

    interface Processor

    {

        String getName();

    }

     class Process

    {

        private final Map<String, Processor> processorMap;

        @Inject

        public Process(final Map<String, Processor> processorMap)

        {

            this.processorMap = processorMap;

        }

        String process(final String country)

        {

            return processorMap.get(country).getName();

        }

    }

class ConfigA implements Config {

}

class ConfigB implements Config {

}

     class ProcessorA implements Processor

    {

        public ProcessorA(final SomeADeps deps, final Config config) {}

} 

     class ProcessorB implements Processor

    {

        public ProcessorB(final Config config, final SomeBDeps deps) {}

} 

  class Process

    {

        private final Map<String, Processor> processorMap;

        @Inject

        public Process(final Map<String, Processor> processorMap)

        {

            this.processorMap = processorMap;

        }

        String process(final String country)

        {

            return processorMap.get(country).getName();

        }

    }

In the binding section

public class TestModule extends AbstractModule {

 protected void configure()

    {

        //All the config object are created by loading from various property files

        Map<String, Config> countryToConfigMap;  // This map is populated

        //I also have a property file, that says

        // country US > use ProcessorA ( with ConfigA instance 1 )

        // country UK > use ProcessorA  ( with ConfigA instance 2 )

        // country DE > use ProcessorB  ( with ConfigB instance 1 ) 

        //etc 

       //TODO: How to bind Process class ?

    } 

}

In the main class, I'm trying to do something like this:

Injector injector = Guice.createInjector(new TestModule());

Process process = injector.getInstance(Process.class);

System.out.println("Name:" + process.process("US"));

Could someone help me understand and figure out on how to go about solving the above design using guice ?

Thanks!

[Fred Faber]

Have a look here:

  http://code.google.com/p/google-guice/wiki/FrequentlyAskedQuestions#How_do_I_build_two_similar_but_slightly_different_trees_of_objec

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