4.建造者(生成器)模式¶

package builder

import "fmt"

type Deployment struct {
    Name string
    // 镜像信息
    Image, ContainerName string
    // 端口信息
    SvcPort, ContainerPort int
}

func (d *Deployment) String() string {
    return fmt.Sprintf("Name:%s,Image:%s,ContainerName:%s,SvcPort:%d,ContainerPort:%d",
        d.Name,d.Image,d.ContainerName,d.SvcPort,d.ContainerPort)
}

type DeploymentBuilder struct {
    deployment *Deployment
}

// 总体deployment 工厂函数
func NewDeploymentBuilder() *DeploymentBuilder  {
    return &DeploymentBuilder{deployment: &Deployment{}}
}

// Deployment 镜像建造者
type DeployImgBuilder struct {
    DeploymentBuilder
}

// Deployment 端口建造者
type DeployPortBuilder struct {
    DeploymentBuilder
}

// 镜像建造
func (d *DeploymentBuilder) imgs() *DeployImgBuilder {
    return &DeployImgBuilder{*d}
}

// 端口建造
func (d *DeploymentBuilder) ports() *DeployPortBuilder  {
    return &DeployPortBuilder{*d}
}

// 使用 DeployImgBuilder/DeployPortBuilder 创建一些行为/函数/方法，用于设置Deployment的属性
func (d *DeploymentBuilder) Name(name string) *DeploymentBuilder  {
    d.deployment.Name = name
    return d
}

// DeployImgBuilder 设置镜像名称
func (i *DeployImgBuilder) Image(n string) *DeployImgBuilder {
    i.deployment.Image = n
    return i
}

// DeployImgBuilder 设置容器名称
func (i *DeployImgBuilder) ContainerName(n string) *DeployImgBuilder  {
    i.deployment.ContainerName = n
    return i
}

// DeployPortBuilder 设置svc端口
func (p *DeployPortBuilder) SvcPort(o int) *DeployPortBuilder  {
    p.deployment.SvcPort = o
    return p
}

// DeployPortBuilder 设置容器端口
func (p *DeployPortBuilder) ContainerPort(o int) *DeployPortBuilder  {
    p.deployment.ContainerPort = o
    return p
}

// 最后使用DeploymentBuilder 来返回builder
func (b *DeploymentBuilder) build() *Deployment  {
    return b.deployment
}

package builder

import (
    "fmt"
    "testing"
)

func TestNewDeploymentBuilder(t *testing.T) {
    db := NewDeploymentBuilder()
    deploy := db.Name("deployname").
        imgs().
            ContainerName("cname").
            Image("cimage").
        ports().
            ContainerPort(80).
            SvcPort(30088).
        build()
    t.Logf(deploy.String())
    fmt.Println(deploy.String())
}