tomcat 7 源码分析-13 处理request的Valve和Valve的链表Pipeline

tomcat打开endpoint的监听对通过某种协议，通常下是http的信息进行解析，组装成request，接着给Http11Protocol（ProtocolHandler）和Http11Processor处理。

    public void removeValve(Valve valve) {        Valve current;        if(first == valve) {            first = first.getNext();            current = null;        } else {            current = first;        }        while (current != null) {            if (current.getNext() == valve) {                current.setNext(valve.getNext());                break;            }            current = current.getNext();        }        if (first == basic) first = null;        if (valve instanceof Contained)            ((Contained) valve).setContainer(null);        // Stop this valve if necessary        if (getState().isAvailable()) {            if (valve instanceof Lifecycle) {                try {                    ((Lifecycle) valve).stop();                } catch (LifecycleException e) {                    log.error("StandardPipeline.removeValve: stop: ", e);                }            }        }        try {            ((Lifecycle) valve).destroy();        } catch (LifecycleException e) {            log.error("StandardPipeline.removeValve: destroy: ", e);        }                container.fireContainerEvent(Container.REMOVE_VALVE_EVENT, valve);    }