Tomcat9.0启动过程中的Listener们

Tomcat9.0（可能8.0也一样）启动过程中的配置文件加载，一部分是通过EngineConfig, HostConfig, ContextConfig来进行的

这3个类都实现自LifecycleListener，初始化过程中他们执行顺序如下：

 

• add listener: EngineConfig(Digester 中 操作的)

• add listener: HostConfig(Digester 中 操作的)

• fire listener: EngineConfig, before_init

• fire listener: EngineConfig, after_init

• fire listener: EngineConfig, before_start

• fire listener: HostConfig, before_init

• fire listener: HostConfig, after_init

• fire listener: HostConfig, before_start

• fire listener: HostConfig, start

• add listener: ContextConfig(HostConfig中的deployWar时操作的)

• fire listener: ContextConfig, before_init

• fire listener: ContextConfig, after_init

• fire listener: ContextConfig, before_start

• fire listener: ContextConfig, configure_start

• fire listener: ContextConfig, start

• fire listener: ContextConfig, after_start

• fire listener: HostConfig, after_start

• fire listener: EngineConfig, start

• fire listener: EngineConfig, after_start

 

（画图很累了，我就不写文字描述了）