Halo plugin experimental

Halo 博客插件化的功能性探索。

简介

插件管理能力位于 extensions 目录下

plugins 目录下为插件示例

在插件和 Halo 主应用共用 ApplicationContext 还是插件使用独立的 ApplicationContext的问题上：

经过实验最终还是选择插件和 Halo 使用同一个 ApplicationContext，原因如下：

插件作为独立应用使用时（即有自己独立的ApplicationContext）加载一个空插件在我的机器上需要 10s以上，而这段时间基本都是花费在插件加载时创建插件的ApplicationContext上，如果插件功能类文件过多则会导致时间更久，在配置低的服务器上则无法想像。
如果以插件使用独立ApplicationContext为依据开发插件功能那么当一个Halo应用存在 10 个插件时，加载插件所耗费的时间以及插件的ApplicationContext造成的无用资源浪费也是不可容忍的。

实现

自定义ScanningExtensionFinder插件类扫描器以提供对spring注解的支持
插件的所有类由自定义的插件类加载器SpringPluginClassLoader加载防止名称空间伪造
启用插件后将带有spring注解的插件类加载到 Halo 的 Spring 容器中。该功能由SingletonSpringExtensionFactory完成
加载时带有ExtController和ExtRestController注解的类由PluginRequestMappingManager注册到MVC

目标

插件可以注入使用Halo提供的Bean
插件可以像写普通的spring boot应用一样
插件在开发时可以引入Halo中不存在的外部依赖
插件的静态资源可以被主应用加载
插件发生异常不会影响主应用及其他插件的使用（随主应用加载时，动态加载时）
插件类使用独立的类加载器
插件和主应用共用ApplicationContext却又能做到Bean之间的隔离
主应用可以定义扩展点由插件选择性实现
插件可以使用主应用定义的事件（Event）

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Comments

静态文件支持
测试流程 以potatoes 项目为例，在resources/static 新增需要的js、css、flt等静态资源。并build（打包）

将 potatoes-1.0-SNAPSHOT-plain.jar 放入plugins插件加载目录

halo 主程序启动后，当PluginManagerController#start 接口被调用，会将jar里面的resources/static 所有资源复制到 ${user.home}/halo-dev/static/{pluginId} 目录下

访问 ${halo.plugin.controller.base-path:/plugins}/web/{pluginId}/ ，就能正常访问静态资源

本地调试

core 主程序会加载工程目录 plugins/potatoes 下{pluginId}-*.jar ，将resources/static资源进行复制
opened by cooker 4