code: public PolicyExecutor create(String identifier) {
          return new PolicyExecutorImpl((ExecutorServiceImpl) globalExecutor, "PolicyExecutorProvider-" + identifier, null, policyExecutors);
      }
docs: Creates a new policy executor instance.
  
  @param identifier unique identifier for the new instance, to be used for monitoring and problem determination.
  Note: The prefix, PolicyExecutorProvider-, is prepended to the identifier.
  @return a new policy executor instance.
  @throws IllegalStateException if an instance with the specified unique identifier already exists and has not been shut down.
  @throws NullPointerException if the specified identifier is null