added shape factory method

concurrency/mastering_concurrency_in_go/ch1/ch1.go

@@ -0,0 +1,38 @@
+package ch1
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+type Job struct {
+	i    int
+	max  int
+	text string
+}
+
+func outputText(j *Job, goGroup *sync.WaitGroup) {
+	for j.i < j.max {
+		time.Sleep(1 * time.Millisecond)
+		fmt.Println(j.text)
+		j.i++
+	}
+	goGroup.Done()
+}
+func Run() {
+	goGroup := new(sync.WaitGroup)
+	fmt.Println("Starting")
+	hello := new(Job)
+	hello.text = "hello"
+	hello.i = 0
+	hello.max = 2
+	world := new(Job)
+	world.text = "world"
+	world.i = 0
+	world.max = 2
+	go outputText(hello, goGroup)
+	go outputText(world, goGroup)
+	goGroup.Add(2)
+	goGroup.Wait()
+}

concurrency/mastering_concurrency_in_go/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "github.com/jianhan/go-patterns/concurrency/mastering_concurrency_in_go/ch1"
+
+func main() {
+	ch1.Run()
+}

creational/factorymethod/shape/shape.go

@@ -0,0 +1,43 @@
+package shape
+
+import (
+	"errors"
+
+	"github.com/davecgh/go-spew/spew"
+)
+
+type Shape interface {
+	Draw()
+}
+
+type Circle struct {
+}
+
+func (c *Circle) Draw() {
+	spew.Dump("Draw Circle")
+}
+
+type Square struct {
+}
+
+func (s *Square) Draw() {
+	spew.Dump("Draw Square")
+}
+
+type Rec struct {
+}
+
+func (r *Rec) Draw() {
+	spew.Dump("Draw Rec")
+}
+
+func GetShape(shape string) (Shape, error) {
+	if shape == "Circle" {
+		return &Circle{}, nil
+	} else if shape == "Square" {
+		return &Square{}, nil
+	} else if shape == "Rec" {
+		return &Rec{}, nil
+	}
+	return nil, errors.New("Shape not found")
+}