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
}

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