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phandler.go
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phandler.go
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package main
import (
"fmt"
"time"
)
type Person struct {
Name string
Age uint8
Address Addr
}
type Addr struct {
city string
district string
}
type PersonHandler interface {
Batch(origs <-chan Person) <-chan Person
Handle(orig Person)
}
type PersonHandlerImpl struct{}
func (handler PersonHandlerImpl) Batch(origs <-chan Person) <-chan Person {
dests := make(chan Person, 100)
go func() {
for p := range origs {
handler.Handle(p)
dests <- p
}
fmt.Println("All the information has been handled.")
close(dests)
}()
return dests
}
func (handler PersonHandlerImpl) Handle(orig Person) {
if orig.Address.district == "Haidian" {
orig.Address.district = "Shijingshan"
}
}
var personTotal = 200
var persons []Person = make([]Person, personTotal)
var personCount int
func init() {
for i := 0; i < 200; i++ {
name := fmt.Sprintf("%s%d", "P", i)
p := Person{name, 32, Addr{"Beijing", "Haidian"}}
persons[i] = p
}
}
func main() {
handler := getPersonHandler()
origs := make(chan Person, 100)
dests := handler.Batch(origs)
fecthPerson(origs)
sign := savePerson(dests)
<-sign
}
func getPersonHandler() PersonHandler {
return PersonHandlerImpl{}
}
func savePerson(dest <-chan Person) <-chan byte {
sign := make(chan byte, 1)
go func() {
for {
p, ok := <-dest
if !ok {
fmt.Println("All the information has been saved.")
sign <- 0
break
}
savePerson1(p)
}
}()
return sign
}
func fecthPerson(origs chan<- Person) {
origsCap := cap(origs)
buffered := origsCap > 0
goTicketTotal := origsCap / 2
goTicket := initGoTicket(goTicketTotal)
go func() {
for {
p, ok := fecthPerson1()
if !ok {
for {
if !buffered || len(goTicket) == goTicketTotal {
break
}
time.Sleep(time.Nanosecond)
}
fmt.Println("All the information has been fetched.")
close(origs)
break
}
if buffered {
<-goTicket
go func() {
origs <- p
goTicket <- 1
}()
} else {
origs <- p
}
}
}()
}
func initGoTicket(total int) chan byte {
var goTicket chan byte
if total == 0 {
return goTicket
}
goTicket = make(chan byte, total)
for i := 0; i < total; i++ {
goTicket <- 1
}
return goTicket
}
func fecthPerson1() (Person, bool) {
if personCount < personTotal {
p := persons[personCount]
personCount++
return p, true
}
return Person{}, false
}
func savePerson1(p Person) bool {
return true
}