关于golang:手撸golang-spring-iocaop-之2

49次阅读

共计 6324 个字符，预计需要花费 16 分钟才能阅读完成。

手撸 golang spring ioc/aop 之 2

最近浏览 [Offer 来了：Java 面试外围知识点精讲（框架篇）] (王磊 , 2020.6)
本系列笔记拟采纳 golang 练习之
Talk is cheap, show me the code.

Spring 基于 J2EE 技术实现了一套轻量级的
Java Web Service 零碎利用框架。它有很多优良的个性，很多公司都抉择把
Spring 作为产品或我的项目的根底开发架构。Spring 的个性包含轻量、管制反转（Inversion of Control, IoC）、面向容器、面向切面（AspectOriented 
Programming, AOP）和框架灵便等。源码 gitee 地址：https://gitee.com/ioly/learning.gooop

原文链接：https://my.oschina.net/ioly

参考 spring 罕用注解，应用 golang 编写“基于注解的动态代码增强器 / 生成器”
- 配置：ComponentScan，Configuration, Bean
- Bean 申明：Component, Service, Controller
- Bean 注入：Autowried
- AOP 注解：Before, After, Around, PointCut

构思 app 的运行模式：
- 本地 standlone 模式运行
- 提供基于 cli 的命令行实时交互
- 生成旁路代码：只扫描源代码，不批改源代码，加强后的代码加对立后缀
设计 cli 交互指令集：
- config save：保留配置
- config saveas <name>：另存配置
- watch add <dir>：增加代码扫描目录
- watch del <dir>：移除代码扫描目录
- watch list：显示以后扫描的代码目录汇合
- gen：生成加强代码，也就是扫描所有注解，并生成加强类和加强办法

config/IConfiguration：配置接口
command/ICmd：指令接口
command/ICmdBuilder：指令构建器接口
command/ICmdContext：指令执行上下文接口
config_cmd/SaveCmd: 保留配置
config_cmd/SaveASCmd: 另存配置
watch_cmd/AddCmd: 增加监督
watch_cmd/DelCmd: 移除监督
watch_cmd/ListCmd: 显示已监督目录的列表
gen_cmd/GenCmd: 生成加强类和加强办法
model/IEventDrivenModel：“事件驱动”的逻辑编排模型
logger: 日志接口，略

配置接口

package config

// IConfiguration defines system configuration interface
type IConfiguration interface {GetProjectName() string
    SetProjectName(string)

    GetWatchPaths() []string
    AddWatchPath(string)
    DelWatchPath(string)

    Save() error
    SaveAS(string) error
}

指令接口

package command

import "fmt"

// ICmd defines cli command interface
type ICmd interface {
    fmt.Stringer

    // Apply apply current command into use
    Apply(ICmdContext) error
}

指令构建器接口

package command

// ICmdBuilder parse input string and create an ICmd instance
type ICmdBuilder interface {Build(string) (error, ICmd)
}

指令执行上下文接口

package command

import "learning/gooop/spring/autogen/config"

// ICmdContext provides context info for all commands
type ICmdContext interface {GetConfiguration() config.IConfiguration
}

保留配置

package config_cmd

import ("learning/gooop/spring/autogen/command")

// SaveCmd calls service.Save() to save current configuration, in JSON format
type SaveCmd int

// SaveCmdBuilder parse cli input and build a SaveCmd instance
type SaveCmdBuilder int

const gSaveCmdString = "config save"
var gSaveCmdInstance = new(SaveCmd)

func (me *SaveCmd) String() string {return gSaveCmdString}

func (me *SaveCmd) Apply(c command.ICmdContext) error {
    // todo: fixme
    panic("implements me")
}

func (me *SaveCmdBuilder) Build(line string) (error, command.ICmd) {
    if line != gSaveCmdString {return nil, nil}

    return nil, gSaveCmdInstance
}

另存配置

package config_cmd

import (
    "errors"
    "learning/gooop/spring/autogen/command"
    "strings"
)

// SaveASCmd calls service.SaveAS() to save current config into specific file, in JSON format
type SaveASCmd struct {file string}

// SaveASCmdBuilder parse cli input and returns a SaveASCmd instance
type SaveASCmdBuilder int

const gSaveASCmdPrefix = "config saveas"

func (me *SaveASCmd) String() string {return gSaveASCmdPrefix + me.file}

func (me *SaveASCmd) Apply(c command.ICmdContext) error {
    // todo: fixme
    panic("implements me")
}

func (me *SaveASCmdBuilder) Build(line string) (error, command.ICmd) {if !strings.HasPrefix(line, gSaveASCmdPrefix) {return nil, nil}

    file := strings.TrimSpace(line[len(gSaveASCmdPrefix):])
    if len(file) <= 0 {return errors.New("empty file path"), nil
    }

    return nil, &SaveASCmd{file}
}

增加监督

package watch_cmd

import (
    "learning/gooop/spring/autogen/command"
    "os"
    "strings"
)

// AddCmd calls service.WatchAdd() to add dir to watch list
type AddCmd struct {dir string}

type AddCmdBuilder int

var gAddCmdPrefix = "watch add"

func (me *AddCmd) String() string {return gAddCmdPrefix + me.dir}

func (me *AddCmd) Apply(c command.ICmdContext) error {
    // todo: fixme
    panic("implements me")
}

func (me *AddCmdBuilder) Build(line string) (error, command.ICmd) {
    // check prefix
    if !strings.HasPrefix(line, gAddCmdPrefix) {return nil, nil}

    // get dir
    dir := strings.TrimSpace(line[len(gAddCmdPrefix):])

    // check dir
    _,e := os.Stat(dir)
    if e != nil {return e, nil}

    // ok
    return nil, &AddCmd{dir}
}

移除监督

package watch_cmd

import (
    "learning/gooop/spring/autogen/command"
    "os"
    "strings"
)

// DelCmd calls service.WatchDel() to remove dir from watch list
type DelCmd struct {dir string}

type DelCmdBuilder int

var gDelCmdPrefix = "watch del"

func (me *DelCmd) String() string {return gDelCmdPrefix + me.dir}

func (me *DelCmd) Apply(c command.ICmdContext) error {
    // todo: fixme
    panic("implements me")
}

func (me *DelCmdBuilder) Build(line string) (error, command.ICmd) {
    // check prefix
    if !strings.HasPrefix(line, gDelCmdPrefix) {return nil, nil}

    // get dir
    dir := strings.TrimSpace(line[len(gAddCmdPrefix):])

    // check dir
    _,e := os.Stat(dir)
    if e != nil {return e, nil}

    // ok
    return nil, &DelCmd{dir}
}

显示已监督目录的列表

package watch_cmd

import ("learning/gooop/spring/autogen/command")

// ListCmd calls service.WatchList
type ListCmd int

// ListCmdBuilder parse cli input and try to build a ListCmd instance
type ListCmdBuilder int

const gListCmdString1 = "watch list"
const gListCmdString2 = "watch ls"
var gListCmdSingleton = new(ListCmd)

func (me *ListCmd) String() string {return gListCmdString1}

func (me *ListCmd) Apply(c command.ICmdContext) error {
    // todo:
    panic("implements me")
}

func (me *ListCmdBuilder) Build(line string) (error, command.ICmd) {
    if line != gListCmdString1 && line != gListCmdString2 {return nil, nil}

    return nil, gListCmdSingleton
}

生成加强类和加强办法

package gen_cmd

import ("learning/gooop/spring/autogen/command")

// GenCmd calls service.Gen() to generate enhanced code files at once
type GenCmd int

// GenCmdBuilder parse cli input and try to build a GenCmd instance
type GenCmdBuilder int

const gGenCmdString = "gen"
var gGenCmdSingleton = new(GenCmd)

func (me *GenCmd) String() string {return gGenCmdString}

func (me *GenCmd) Apply(c command.ICmdContext) error {panic("implements me")
}

func (me *GenCmdBuilder) Build(line string) (error, command.ICmd) {
    if line != gGenCmdString {return nil, nil}

    return nil, gGenCmdSingleton
}

“事件驱动”的逻辑编排模型

package model

// IEventDrivenModel defines an event driven model for code arrangement
type IEventDrivenModel interface {Hook(e string, handleFunc TEventHandleFunc)
    Fire(e string, args ...interface{})
    FireAsync(e string, args ...interface{})
}

type TEventHandleFunc func(e string, args ...interface{})

type TEventDrivenModel struct {items map[string][]TEventHandleFunc}

func (me *TEventDrivenModel) Hook(e string, handler TEventHandleFunc) {
    if me.items == nil {me.items = make(map[string][]TEventHandleFunc)
    }

    arr, ok := me.items[e]
    if ok {me.items[e] = append(arr, handler)
    } else {me.items[e] = []TEventHandleFunc{handler}
    }
}

func (me *TEventDrivenModel) Fire(e string, args ...interface{}) {if handlers, ok := me.items[e]; ok {
        for _, it := range handlers {it(e, args...)
        }
    }
}

func (me *TEventDrivenModel) FireAsync(e string, args ...interface{}) {go me.Fire(e, args...)
}

（未完待续）

正文完

spring

发表至： spring

2021-04-10

0

SpringCloud-第四篇-Hystrix快速上手一

SpringApplication的初始化过程

关于spring:Spring-Boot-分离配置文件的-N-种方式

关于spring:Spring-cache源码分析

关于enum:springboot枚举类型传递

关于golang:手撸golang-spring-iocaop-之2

缘起

Spring

指标

子目标（Day 2）

设计

config/IConfiguration.go

command/ICmd.go

command/ICmdBuilder.go

command/ICmdContext.go

config_cmd/SaveCmd.go

config_cmd/SaveASCmd.go

watch_cmd/AddCmd.go

watch_cmd/DelCmd.go

watch_cmd/ListCmd.go

gen_cmd/GenCmd.go

model/IEventDrivenModel.go

Just My Socks（注册教程内含优惠码）

关于golang:手撸golang-spring-iocaop-之2

缘起

Spring

指标

子目标（Day 2）

设计

config/IConfiguration.go

command/ICmd.go

command/ICmdBuilder.go

command/ICmdContext.go

config_cmd/SaveCmd.go

config_cmd/SaveASCmd.go

watch_cmd/AddCmd.go

watch_cmd/DelCmd.go

watch_cmd/ListCmd.go

gen_cmd/GenCmd.go

model/IEventDrivenModel.go

Just My Socks（注册教程 内含优惠码）

Just My Socks（注册教程内含优惠码）