Plugin tutorial

重要接口

ExtensionPoint & Describable：a plugin may simply implement extension points, registering them with the @hudson.Extension annotation for automatic detection by Jenkins.
GlobalVariable
Plugin：A plugin’s main entry point may be a PluginImpl class that extends from Plugin. Once Jenkins detects this plugin class (via its inheritance relationship from Plugin), it will create an instance, and invoke methods.
@Initializer
hudson.model.Action 和它的子接口们

Extensions

Extensions Index：Extension points defined in Jenkins Core 中列出的是Jenkins Core中所有的扩展点及目前所有的Jenkins插件中实现此扩展点的插件；剩余的部分是从每个插件的视角，描述了每个插件实现了Jenkins Core中的哪些扩展点，以及有哪些雷类实现了此扩展点；