how to waiter for dummies

1, What is layer three? UI ( presentation layer ): mainly refers to the interface that interacts with the user . Used to receive data entered by the user and to display the data that the user needs after processing. BLL: ( business Logic Layer ): A bridge between the UI layer and the DAL layer . Implement business logic . Business logic includes: validation, calculations, business rules, and so on. DAL: ( data Access layer ): dealing with Databases . The main realization of the data increase,

): while True: ares = self. ares try: waiter = Waiter (self. hub) # use Waiter ares. gethostbyname (waiter, hostname, family) # call ares. gethostbyname, set the callback to waiter result = waiter. get () # We know that when

this mode? I think there are two reasons: 1. The hub is the core of the event-driven system. After each switch to the hub, the events will continue to run cyclically. If it is not available in one greenlet, other greenlets will not be called. 2. Maintaining the relationship between the two is certainly easier than maintaining multiple relationships. Each time we care about the hub and the current greenlet, we do not need to consider the relationship between each greenlet. Let's see what happen

timeout and broken_connections every second.Io wather callback self. _ process_fd is mainly to call cares. ares_process_fd to continue processing the specified file descriptor, Cares. ares_socket_bad indicates that the event is not processed, that is, the event has been processed. Def _ process_fd (self, int events, object watcher): If not self. channel: Return cdef int read_fd = watcher. FD # file descriptor cdef int write_fd = read_fd if not (events ev_read): # if there is no readable event

Chef () {super ();} public Chef (String name, String id) {super (name, id);} public void work () {System. out. println ("chef in cooking");} public void services () {System. out. println ("exquisite dishes for VIP ");}} Package hotel;/** attendant class: * inherits the Employee class and implements the VIP interface */public class Waiter extends Employee implements VIP {public Waiter () {super ();} public

, set the descriptor as non-blocking, and set the event type to be processed in the epoll_event structure to read and write, The way of working is epoll_et.(f) If the Epoll event indicates that data is readable on the socket descriptor, the socket descriptor is added to the readable queue, the receiving thread is notified to read the data, and the received data is placed into the linked list of the received data, and after being logically processed, the feedback packet is placed in the Sending D

, the socket descriptor is added to the readable queue, the receiving thread is notified to read the data, and the received data is placed in the linked list of the received data, and after being logically processed, the feedback packet is placed in the Sending Data link table. Waits to be sent by the sending thread. Epoll's operation is as simple as a total of 4 api:epoll_create, Epoll_ctl, epoll_wait and close.We can give a simple example to illustrate the Apache workflow, we usually go to the

Spring AOP pre-enhancement and post-enhancement Demo Waiter interface Waiter. java package com.paic.zhangqi.spring.aop;public interface Waiter {void greetTo(String name);void serveTo(String name);} Waiter interface implementation class NaiveWaiter. java package com.paic.zhangqi.spring.aop;public class NaiveWaiter im

(1) [Love and wisdom] Are you willing to stop and find a solution for someone who needs help? Perhaps inadvertently, not only others, but also you -- One night, it was very late. An old couple walked into a hotel and they wanted a room. The front-end waiter replied, "Sorry, our hotel is full and there is no room left ." Looking at the tired look of the old man, the waiter said, "But let me find a solution

includes tea that can be made by customers in a tea house. For example, "Xihu Longjing "," Dongting Biluochun "," "," junshan silver needle "," Huangshan maofeng "," Wuyan Tea "," Anxi Tieguanyin "," Xinyang Mao Jian ", "Lushan cloud "," Lu'an melon slices.Infuseman is a class in the system. He can make tea of various flavors according to the orders placed by the waiter (waitor ). If the flavor of the tea is ready, it will be provided directly to the

relationship here?tight CouplingThe tight coupling between the client and the butcher's boss makes it easy to make mistakes and mess up, and it's easy to pick up. Here is the tight coupling between the requester of the act and the perpetrator of the act. we need to record which few people's kebabs, there is no special request (spicy not spicy), paid no, who first who after AH. This is the request to do what oh. Make a record of the request Oh, that is the log. If someone asks for a withdrawal r

has more than one base class, this inheritance is called multiple inheritance.For example, there are two classes, waiter class waiter, singer Class singer, we have a class is both a waiter and a singer,Then we can define a multiple-inheritance relationship for the class as follows:class waiter{}; class singer{}; class

the target method is enhanced after execution. Surround Enhancement Org. springframework. aop. MethodInterceptor indicates enhanced surround, indicating enhanced implementation before and after the target method is executed. Exception throw Enhancement Org. springframework. aop. ThrowsAdvice indicates that the exception is thrown and the enhancement is performed after the target method throws an exception. Introduction Enhancement Org. springframework. aop. IntroductionInterceptor indicat

Interface Waiter { publicvoid server ();}Front-facing notification interface Package cn.edu; Public Interface Advicebefore { publicvoid before ();}Post Notification interface Package cn.edu; Public Interface Adviceafter { publicvoid after ();}Agent Factory Packagecn.edu;ImportJava.lang.reflect.InvocationHandler;ImportJava.lang.reflect.Method;ImportJava.lang.reflect.Proxy;/*** Agent factory for production of proxy objects * *@authorWangha

eat, the restaurant waiter according to their appetite for their meals. We first conceived, first of all, to have an interface, the interface defines an abstract method for the appetite (callback interface), followed by the creation of Wang Gang Eggs (callback Class), let the Wang Gang egg implementation of this interface, and want to good appetite (callback method); Finally, creating a restaurant, The restaurant attendant (the other party) receives

connection use"3, say the three-tier architecture, namely the DAL (Data Access layer), the BLL (business Logic Layer), the UI (presentation layer), the three-tier architecture is the important role of decoupling, that is, to remove the coupling, so that any layer changes will not affect the other layer. Data access layer is used to interact with the database, that is, to realize the data deletion and modification. The business logic layer is the bridge between the UI layer and the DAL layer, wh

=Thread.CurrentThread (). GetName (); SYSTEM.OUT.PRINTLN (Name+ "Started"); Try{Thread.Sleep (1000); synchronized(msg) {msg.setmsg (name+ "Notifier work done"); Msg.notify ();//Msg.notifyall (); } } Catch(interruptedexception e) {e.printstacktrace (); } }}Waiter: Make Message object wait state Public classWaiterImplementsrunnable{PrivateMessage msg; PublicWaiter (Message m) { This. msg=m; } @Override Public voidrun () {String nam

the kernel hook, which must be implemented by a driver. 　　What is hook? What is ssdt? Here is an example: 　　Windows operating system is like a service company that manages computers for us, and its working mechanism is reported step by step, each taking its responsibilities, he sent a service staff to follow us at all times, see what requirements we have. 　　When we want to check what processes are in the system, we will tell the waiter that we want t

guests order their food, the waiter will tell the cook about their requirements. The cook starts to work, and the waiter will be able to greet other guests. My friend had an epiphany and the problem was solved. Of course, in the story above, Old Zhao's friends are too stupid. restaurant owners in real life will not make such low-level mistakes in personnel scheduling. The development of a client applicati

decorators /** * 继承的方式增强一个类中某个方法: */class Man{public void run(){System.out.println("跑....");}}class SuperMan extends Man{public void run(){// super.run();System.out.println("飞....");}}/** * 使用装饰者的方式完成类的方法的增强 */interface Waiter{public void server();}class Waiteress implements Waiter{@Overridepublic void server() {System.out.println("服务...");}}class WaiteressWrapper implements