Created
April 11, 2018 17:15
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dependency injection pattern
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| package main | |
| import ( | |
| "net/http" | |
| "net/http/httptest" | |
| ) | |
| func main() { | |
| m := mongo{} | |
| h := handler{d: m} | |
| http.ListenAndServe(":8080", h) | |
| } | |
| // package handler | |
| type handler struct { | |
| d handler_dal | |
| } | |
| func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| w.WriteHeader(http.StatusNoContent) | |
| } | |
| type handler_dal interface { | |
| Get(string) interface{} | |
| } | |
| type mockDal struct { | |
| } | |
| func (m mockDal) Get(string) interface{} { | |
| return nil | |
| } | |
| // *_test.go | |
| func TestSomething() { | |
| //mdal := mockDal{/* mock */} | |
| mmdal := daltest_MockDal{} | |
| h := handler{d: mmdal} | |
| httptest.NewServer(h) | |
| // test | |
| } | |
| // package dal | |
| type dal interface { | |
| Get(string) interface{} | |
| Store(string, string) error | |
| } | |
| // package dal/mongo | |
| type mongo struct { | |
| } | |
| func (m mongo) Get(string) interface{} { | |
| return nil | |
| } | |
| func (m mongo) Store(string, string) error { | |
| return nil | |
| } | |
| // package dal/daltest | |
| type daltest_MockDal struct { | |
| } | |
| func (m daltest_MockDal) Get(string) interface{} { | |
| return nil | |
| } | |
| func (m daltest_MockDal) Store(string, string) error { | |
| return nil | |
| } |
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