接收我试图排序的实施反应golang实现。我有一批观察员。他们只是一堆渠道。一切都封装在其他代码可以订阅和取消订阅的包中。当有订单被创建时,更改将被推送。但是我没有在方法中注册频道接收。值通过方法去发送到通道,不能在外面
package rxOrder
import (
"fmt"
"time"
"errors"
"gopkg.in/mgo.v2/bson"
)
// Order This is the sample data structure
type Order struct {
id bson.ObjectId
moldID bson.ObjectId
bomID bson.ObjectId
deviceID bson.ObjectId
userIds []bson.ObjectId
name string
orderType string // withOrder, noOrder, makeUp, test
startTime time.Time
deadline time.Time
volume int32
}
// OrderMutation This is the struct for sending
// mutations to observers
type OrderMutation struct {
order Order
action string
}
// RxOrder This is the node for reactive Order
// management
type RxOrder struct {
orders []Order
observers map[string]chan OrderMutation
}
// init This method initialize RxOrder, including
// orders slice and subscriber map, user cannot
// initialize a RxOrder object more than once
func (rx *RxOrder) init() error {
if len(rx.orders) == 0 && len(rx.observers) == 0 {
rx.orders = make([]Order, 1)
rx.observers = make(map[string]chan OrderMutation)
return nil
}
return errors.New("Cannot reinitialize orders")
}
// subscribe, add observer to list
func (rx *RxOrder) subscribe(key string, ch chan OrderMutation) error {
if _, ok := rx.observers[key]; ok {
return errors.New("Observer already existed")
}
rx.observers[key] = ch
return nil
}
// unsubscribe, delete observer from list
func (rx *RxOrder) unsubscribe(key string) error {
if _, ok := rx.observers[key]; !ok {
return errors.New("Observer does not exist")
}
delete(rx.observers, key)
return nil
}
// createOrder The method for creating an order
func (rx *RxOrder) createOrder(order Order) error {
if !order.id.Valid() {
return errors.New("Invalid order id")
}
if !order.bomID.Valid() {
return errors.New("Invalid bom id")
}
if !order.deviceID.Valid() {
return errors.New("Invalid device id")
}
if !order.moldID.Valid() {
return errors.New("Invalid mold id")
}
if len(order.userIds) < 1 {
return errors.New("Empty users list")
}
for index, userID := range order.userIds {
if !userID.Valid() {
return errors.New(fmt.Sprint("Invalid user id at index: ", index))
}
}
if len(order.name) < 1 {
return errors.New("Empty order name")
}
if order.orderType != "withOrder" && order.orderType != "noOrder" && order.orderType != "makeUp" && order.orderType != "test" {
return errors.New("Wrong order type")
}
if order.startTime.After(order.deadline) {
return errors.New("Deadline cannot come before start time")
}
if order.volume < 1 {
return errors.New("Empty order is not accepted")
}
rx.orders = append(rx.orders, order)
for _, ch := range rx.observers {
ch <- OrderMutation{order, "create"}
}
return nil
}
func TestCreateOrder(t *testing.T) {
orderManagement := RxOrder{}
orderManagement.init()
orderManagement.subscribe("123", make(chan OrderMutation))
orderManagement.subscribe("345", make(chan OrderMutation))
orderManagement.subscribe("768", make(chan OrderMutation))
order := Order{}
order.id = bson.NewObjectId()
order.bomID = bson.NewObjectId()
order.deviceID = bson.NewObjectId()
order.moldID = bson.NewObjectId()
order.name = "iPhone 8+"
order.orderType = "withOrder"
order.volume = 5
order.startTime = time.Now()
order.deadline = order.startTime.AddDate(0, 1, 1)
order.userIds = make([]bson.ObjectId, 1)
order.userIds = append(order.userIds, bson.NewObjectId())
go func(t *testing.T) {
fmt.Println(<-orderManagement.observers["123"])
}(t)
orderManagement.createOrder(order)
//orderManagement.observers["123"] <- OrderMutation{order, "w"}
t.Fail()
}
当我做测试,上面的代码打印什么,但如果我取消注释行:
orderManagement.observers["123"] <- OrderMutation{order, "w"}
一切正常。看来我不能在一个方法内的频道上操作。我如何封装通道操作与封装?
您绝对可以在方法内的通道上操作。你的测试失败,因为总是执行结尾处有一个t.Fail()。你需要有条件地失败。 –
只有通过t.Fail()我可以让测试打印到控制台,通过方法发送的值不被接受的出方 – Nexus2020
我认为你有一个竞争条件存在端接收到。在测试结束之前,不能保证goroutine会打印消息 –