given:
        def componentRegistration = registry.maybeRegisterComponentType(MyComponentType)
        componentRegistration.registerArtifactType(MyArtifactType, ArtifactType.SOURCES)

        when:
        componentRegistration.registerArtifactType(MyArtifactType, ArtifactType.SOURCES)

        then:
        def e = thrown IllegalStateException

import org.gradle.api.component.Artifact;

public interface ComponentTypeRegistration {
    ArtifactType getArtifactType(Class<? extends Artifact> artifact);

    ComponentTypeRegistration registerArtifactType(Class<? extends Artifact> artifact, ArtifactType artifactType);

                              ComponentTypeRegistry componentTypeRegistry) {
            componentTypeRegistry
                .maybeRegisterComponentType(JvmLibrary.class)
                .registerArtifactType(SourcesArtifact.class, ArtifactType.SOURCES);
        }
    }

            // TODO There should be a more explicit way to execute an action against existing services
            componentTypeRegistry.maybeRegisterComponentType(MavenModule.class)
                .registerArtifactType(MavenPomArtifact.class, ArtifactType.MAVEN_POM);
        }

        @Provides
        public VersionRangeMapper createVersionRangeMapper(VersionSelectorScheme versionSelectorScheme) {

            }
            return type;
        }

        @Override
        public ComponentTypeRegistration registerArtifactType(Class<? extends Artifact> artifact, ArtifactType artifactType) {
            if (typeRegistrations.containsKey(artifact)) {

            // TODO There should be a more explicit way to execute an action against existing services
            componentTypeRegistry.maybeRegisterComponentType(IvyModule.class)
                    .registerArtifactType(IvyDescriptorArtifact.class, ArtifactType.IVY_DESCRIPTOR);
        }
    }

        public void configure(ServiceRegistration registration, ComponentTypeRegistry componentTypeRegistry) {
            componentTypeRegistry.maybeRegisterComponentType(JvmLibrary.class)
                .registerArtifactType(JavadocArtifact.class, ArtifactType.JAVADOC);
        }
    }

    private static class JavaProjectScopeServices implements ServiceRegistrationProvider {
        @Provides