SparkPolicyRunner.cs

    public class SparkPolicyRunner : IActivator
    {
        private readonly ISparkViewEngine _engine;
        private readonly IEnumerable<ISparkPolicy> _policies;

        public SparkPolicyRunner(ISparkViewEngine engine, IEnumerable<ISparkPolicy> policies)
        {
            _engine = engine;
            _policies = policies;
        }

        public void Activate(IEnumerable<IPackageInfo> packages, IPackageLog log)
        {
            _policies.Each(policy => policy.Run(_engine, log));
        }
    }

    public interface ISparkPolicy
    {
        void Run(ISparkViewEngine engine, IPackageLog log);
    }