1. A computer-implemented pattern-based policy method for service component architecture (SCA), comprising: defining a policy pattern for SCA, said policy pattern including a plurality of roles and one or more constraints between said plurality of roles as a pattern, each of said plurality of roles defining a plurality of intents or policy sets or combination thereof; identifying one or more roles assigned to said one or more SCA components; applying automatically one or more intents or policy sets or combination thereof associated with said one or more roles to said one or more SCA components; and validating said one or more intents or policy sets or combination thereof applied to said one or more SCA components based on said one or more constraints.