go知识重新整理

Go/DesignPattern/flyWeight/flyWeight.go

@@ -0,0 +1,65 @@
+/**
+* @Author:zhoutao
+* @Date:2020/12/11 下午2:55
+* @Desc:
+ */
+
+package flyWeight
+
+import "fmt"
+
+// 享元模式：从对象中剥离不发生改变，并且多个实例需要的重复数据，独立出来一个享元，让多个对象来共享，从而节省内存以及减少对象数量
+
+type ImageFlyWeightFactory struct {
+	maps map[string]*ImageFlyWeight
+}
+
+var imageFatory *ImageFlyWeightFactory
+
+func GetImageFlyFactory() *ImageFlyWeightFactory {
+	if imageFatory == nil {
+		imageFatory = &ImageFlyWeightFactory{
+			maps: make(map[string]*ImageFlyWeight),
+		}
+	}
+	return imageFatory
+}
+func (f *ImageFlyWeightFactory) Get(filename string) *ImageFlyWeight {
+	image := f.maps[filename]
+	if image == nil {
+		image = NewImageFlyWeight(filename)
+		f.maps[filename] = image
+	}
+	return image
+}
+
+func NewImageFlyWeight(filename string) *ImageFlyWeight {
+	//load image file
+	data := fmt.Sprintf("image data %s", filename)
+	return &ImageFlyWeight{
+		data: data,
+	}
+}
+
+type ImageFlyWeight struct {
+	data string
+}
+
+func (i *ImageFlyWeight) Data() string {
+	return i.data
+}
+
+func NewImageViewr(filename string) *ImageViewer {
+	image := GetImageFlyFactory().Get(filename)
+	return &ImageViewer{
+		ImageFlyWeight: image,
+	}
+}
+
+type ImageViewer struct {
+	*ImageFlyWeight
+}
+
+func (i *ImageViewer) Display() {
+	fmt.Printf("Display:%s\n", i.Data())
+}

Go/DesignPattern/flyWeight/flyweight_test.go

@@ -0,0 +1,17 @@
+/**
+* @Author:zhoutao
+* @Date:2020/12/11 下午3:27
+* @Desc:
+ */
+
+package flyWeight
+
+import "testing"
+
+func TestFlyWeight(t *testing.T) {
+	viewer1 := NewImageViewr("image1.png")
+	viewer2 := NewImageViewr("image1.png")
+	if viewer1.ImageFlyWeight != viewer2.ImageFlyWeight {
+		t.Fail()
+	}
+}