extends AbstractModule
{

    @Override
    protected void configure()
    {
        install( new AetherModule() );
        bind( ArtifactDescriptorReader.class ) //
        .to( DefaultArtifactDescriptorReader.class ).in( Singleton.class );
        bind( VersionResolver.class ) //
        .to( DefaultVersionResolver.class ).in( Singleton.class );
        bind( VersionRangeResolver.class ) //
        .to( DefaultVersionRangeResolver.class ).in( Singleton.class );
        bind( MetadataGeneratorFactory.class ).annotatedWith( Names.named( "snapshot" ) ) //
        .to( SnapshotMetadataGeneratorFactory.class ).in( Singleton.class );
        bind( MetadataGeneratorFactory.class ).annotatedWith( Names.named( "versions" ) ) //
        .to( VersionsMetadataGeneratorFactory.class ).in( Singleton.class );
        bind( ModelBuilder.class ) //
        .toInstance( new DefaultModelBuilderFactory().newInstance() );
    }

    @Provides
    @Singleton
    Set<MetadataGeneratorFactory> provideMetadataGeneratorFactories( @Named( "snapshot" )
                                                                     MetadataGeneratorFactory snapshot,
                                                                     @Named( "versions" )
                                                                     MetadataGeneratorFactory versions )
    {
        Set<MetadataGeneratorFactory> factories = new HashSet<>();

                    }
                }
            }
        }
        catch ( Exception e )
        {
            invalidMetadata( session, trace, metadata, repository, e );
            result.addException( e );
        }
        finally
        {
            IOUtil.close( fis );
        }

        return ( versioning != null ) ? versioning : new Versioning();
    }

    private void invalidMetadata( RepositorySystemSession session, RequestTrace trace, Metadata metadata,
                                  ArtifactRepository repository, Exception exception )
    {
        RepositoryEvent.Builder event = new RepositoryEvent.Builder( session, EventType.METADATA_INVALID );
        event.setTrace( trace );
        event.setMetadata( metadata );
        event.setException( exception );
        event.setRepository( repository );

        repositoryEventDispatcher.dispatch( event.build() );
    }

                                     ArtifactRepository repository, VersionRangeResult result )
    {
        Versioning versioning = null;

        FileInputStream fis = null;
        try
        {
            if ( metadata != null )
            {

                try ( SyncContext syncContext = syncContextFactory.newInstance( session, true ) )
                {
                    syncContext.acquire( null, Collections.singleton( metadata ) );

                    if ( metadata.getFile() != null && metadata.getFile().exists() )
                    {
                        fis = new FileInputStream( metadata.getFile() );
                        org.apache.maven.artifact.repository.metadata.Metadata m =
                            new MetadataXpp3Reader().read( fis, false );
                        versioning = m.getVersioning();