Jetty源码分析(二)---ContainerLifeCycle组件

来源：互联网发布：衣服除皱喷雾知乎编辑：程序博客网时间：2024/06/06 10:49

1.lifecycle是jetty组件的生命周期

public void start()throws Exception;
public void stop() throws Exception;
public boolean isRunning();
public boolean isStarted();
public boolean isStarting();
public boolean isStopping();
public boolean isStopped();
public boolean isFailed();
public void addLifeCycleListener(LifeCycle.Listener listener);
public void removeLifeCycleListener(LifeCycle.Listener listener);

public interface Listener extends EventListener
{
        public void lifeCycleStarting(LifeCycle event);
        public void lifeCycleStarted(LifeCycle event);
        public void lifeCycleFailure(LifeCycle event,Throwable cause);
        public void lifeCycleStopping(LifeCycle event);
        public void lifeCycleStopped(LifeCycle event);
}

从代码上可以看出,jetty每个组件都有start,stop两个函数，六种状态starting-started-running-stopping-stopped 还有个faied状态
他还提供了监听器，可以监听六种任何状态

2.Container是jetyy是一bean管理器

    public boolean addBean(Object o);
    public Collection<Object> getBeans();
    public <T> Collection<T> getBeans(Class<T> clazz);
    public <T> T getBean(Class<T> clazz);
    public boolean removeBean(Object o);
    public void addEventListener(Listener listener);
    public void removeEventListener(Listener listener);

    public interface Listener
    {
        void beanAdded(Container parent,Object child);
        void beanRemoved(Container parent,Object child);
    }
从代码上可以看出,他提供了bean容器的操作方法，也提供了容器中beanAdd和beanRemove的监听

3.ContainerLifeCycle是lifecycle,和Container的实现
Container部份:
       List<Bean> _beans = new CopyOnWriteArrayList<Bean>();
      他把所有的bean存到了CopyOnWriteArrayList（并发安全arrayList）中,
      并用Bean进行标记..

      enum Managed { POJO, MANAGED, UNMANAGED, AUTO }
      private static class Bean{
        private final Object _bean;
        private volatile Managed _managed = Managed.POJO;

     }

     Bean类有4种状态，pojo表示这类仅仅是单纯的存储
                      UNMANAGED LifeCycle组件是否启动和此Bean没任何关系，此bean启动靠自己,且不被Container.Listener监听
                      AUTO 是系统自动判断是哪类型
                      MANAGED   LifeCycle组件已启动，他则必须启动

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