package message // Identifier is an interface that can uniquely identify itself. type Identifier interface { Id() string SetId(string) Name() string } // SimpleId is a simple Identifier implementation used for testing. type SimpleId string // Id returns the Id as a string. func (i SimpleId) Id() string { return string(i) } // SetId is a no-op func (i SimpleId) SetId(s string) { // no-op } // Name returns the Id func (i SimpleId) Name() string { return i.Id() }