连接器的核心功能，本文去除非核心功能，留下整个程序的框架，便于理解。
1、接受连接请求
2.创建request,和response.
3.调用容器对应的Invoke方法，
首先看类的依赖结构。
1.Connetor 构造方法，根据具体的协议名字，创建协议处理器，主要有NIO,BIO，AJP,协议。如果要自定义协议处理剂最重要的协议处理器了。如图，协议处理需要实现ProtocoHandler接口，
构造函数 输入为协议名称
public Connector(String protocol) {
setProtocol(protocol);
// Instantiate protocol handler
ProtocolHandler p = null;
try {
Class<?> clazz = Class.forName(protocolHandlerClassName);
// 实例化一个协议处理器
p = (ProtocolHandler) clazz.newInstance();
} catch (Exception e) {
log.error(sm.getString(
"coyoteConnector.protocolHandlerInstantiationFailed"), e);
} finally {
this.protocolHandler = p;
}
if (!Globals.STRICT_SERVLET_COMPLIANCE) {
URIEncoding = "UTF-8";
URIEncodingLower = URIEncoding.toLowerCase(Locale.ENGLISH);
}
}
2.createRequest 和相应 此处不仔细深入。很简单。就是创建请求和相应对象
public Request createRequest() {
Request request = new Request();
request.setConnector(this);
return (request);
}
/**
* Create (or allocate) and return a Response object suitable for
* receiving the contents of a Response from the responsible Container.
*/
public Response createResponse() {
Response response = new Response();
response.setConnector(this);
return (response);
}
3.启动和关闭。是默认方法；
protected void startInternal() throws LifecycleException {
// Validate settings before starting
if (getPort() < 0) {
throw new LifecycleException(sm.getString(
"coyoteConnector.invalidPort", Integer.valueOf(getPort())));
}
setState(LifecycleState.STARTING);
try {
protocolHandler.start();
} catch (Exception e) {
String errPrefix = "";
if(this.service != null) {
errPrefix += "service.getName(): \"" + this.service.getName() + "\"; ";
}
throw new LifecycleException
(errPrefix + " " + sm.getString
("coyoteConnector.protocolHandlerStartFailed"), e);
}
}
protected void stopInternal() throws LifecycleException {
setState(LifecycleState.STOPPING);
try {
protocolHandler.stop();
} catch (Exception e) {
throw new LifecycleException
(sm.getString
("coyoteConnector.protocolHandlerStopFailed"), e);
}
}
我们从代码看到ProtocoHandler的重要性了明天再看