Go # 设计模式（一）

接口，私有struct与构造函数（真的是个函数），实现在Java中接口+类同样的功能；

package main

type SharedInformer interface {
  Shard(something string) (string,error)
  Informer(something string) (string,error)
}

type SharedIndexInformer interface {
  SharedInformer
  Indexer(something string) (string,error)
}

// NewSharedInformer creates a new instance for the listwatcher.
func NewSharedInformer(somethingShard string,somethingInformer string) SharedInformer {
  return NewSharedIndexInformer(somethingShard, somethingInformer, "")
}

// NewSharedIndexInformer creates a new instance for the listwatcher.
func NewSharedIndexInformer(somethingShard string,somethingInformer string,somethingIndexer string) SharedIndexInformer {
  sharedIndexInformer := &sharedIndexInformer{
    somethingShard: somethingShard,
    somethingInformer: somethingInformer,
    somethingIndexer: somethingIndexer,
  }
  return sharedIndexInformer
}

type sharedIndexInformer struct {
  somethingShard string
  somethingInformer string
  somethingIndexer string
}


func (s *sharedIndexInformer) Shard(something string) (string,error) {
  return "shardSomething",nil
}

func (s *sharedIndexInformer) Informer(something string) (string,error) {
  return "informSomething",nil
}


func (s *sharedIndexInformer) Indexer(something string) (string,error) {
  return "indexSomething",nil
}