public void service(org.apache.coyote.Request req,

                        org.apache.coyote.Response res)

        throws Exception {

        Request request = (Request) req.getNote(ADAPTER_NOTES);

        Response response = (Response) res.getNote(ADAPTER_NOTES);

        if (request == null) {

            // Create objects

            request = connector.createRequest();

            request.setCoyoteRequest(req);

            response = connector.createResponse();

            response.setCoyoteResponse(res);

            // Link objects

            request.setResponse(response);

            response.setRequest(request);

            // Set as notes

            req.setNote(ADAPTER_NOTES, request);

            res.setNote(ADAPTER_NOTES, response);

            // Set query string encoding

            req.getParameters().setQueryStringEncoding

                (connector.getURIEncoding());

        }

                connector.getService().getContainer().getPipeline().getFirst().invoke(request, response);

//最终的方法，获得连接器-->服务--》容器-》管道---》第一个value

               

                }

            }

            AsyncContextImpl asyncConImpl = (AsyncContextImpl)request.getAsyncContext();

            if (asyncConImpl != null) {

                async = true;

                ReadListener readListener = req.getReadListener();

                if (readListener != null && request.isFinished()) {

                    // Possible the all data may have been read during service()

                    // method so this needs to be checked here

                    ClassLoader oldCL =

                            Thread.currentThread().getContextClassLoader();

                    ClassLoader newCL =

                            request.getContext().getLoader().getClassLoader();

                    try {

                        Thread.currentThread().setContextClassLoader(newCL);

                        if (req.sendAllDataReadEvent()) {

                            req.getReadListener().onAllDataRead();

                        }

                    } finally {

                        Thread.currentThread().setContextClassLoader(oldCL);

                    }

                }

            } else if (!comet) {

                request.finishRequest();

                response.finishResponse();

                if (postParseSuccess &&

                        request.getMappingData().context != null) {

                    // Log only if processing was invoked.

                    // If postParseRequest() failed, it has already logged it.

                    // If context is null this was the start of a comet request

                    // that failed and has already been logged.

                    request.getMappingData().context.logAccess(

                            request, response,

                            System.currentTimeMillis() - req.getStartTime(),

                            false);

                }

            }

        } catch (IOException e) {

            // Ignore

        } finally {

            req.getRequestProcessor().setWorkerThreadName(null);

            AtomicBoolean error = new AtomicBoolean(false);

            res.action(ActionCode.IS_ERROR, error);

            // Recycle the wrapper request and response

            if (!comet && !async || error.get()) {

                request.recycle();

                response.recycle();

            } else {

                // Clear converters so that the minimum amount of memory

                // is used by this processor

                request.clearEncoders();

                response.clearEncoders();

            }

        }

    }