cluster

type Cluster interface {
	Join(Directory) protocol.Invoker
}

type ClusterInterceptor interface {
	// Before DoInvoke method
	BeforeInvoker(ctx context.Context, invocation protocol.Invocation)

	// After DoInvoke method
	AfterInvoker(ctx context.Context, invocation protocol.Invocation)

	// Corresponding cluster invoke
	DoInvoke(ctx context.Context, invocation protocol.Invocation) protocol.Result
}

type Directory interface {
	common.Node
	List(invocation protocol.Invocation) []protocol.Invoker
}

type LoadBalance interface {
	Select([]protocol.Invoker, protocol.Invocation) protocol.Invoker
}