problem description original question: how to solve the problem that the promise of es6 cannot execute reslove multiple times? the current problem: how to overwrite the previous problem if the constructor mode is called multiple times? the enviro...
now there are three roles: general factory, middleman, and customer. the framework I use is the laravel framework I have built three middleware: BackendRole.php function: only allow factory access ShopRole.php function: only allow middlemen ...
for example, the code for the first version is: api public function buyGoods(){ $validate->validateParam(); $goods->buy(); } at this time, the first version is running steadily, and we hope that we will not modify this ...
recently playing Nintendo Star Battle, the original character Kabi has a skill-to swallow each other and acquire each other s abilities. how is a function like this designed? Does add a new function corresponding to the ability of the character to th...
for example: A system connects three distribution platforms, namely platform A, platform B and platform C for upper-level business, you only need to take your own order (this part of the attribute is fixed) object as a parameter, as well as the pla...
in the actual project development of PHP, there is little real application of design patterns in business logic. why? suppose a simple scenario: using yii2 or laravel to develop user management-related functions, most of the time a simple MVC is creat...
there are no particularly appropriate examples in hand. Cite one blindly. authors and books. author-- id,name,age book-- id,name,price API: 127:0.0.1 author 1 returns the names and prices of all books and books of the author whose id is 1 is t...
start a thread to consume the queue through @ PostConstruct. I lost the message to the queue somewhere else, so why doesn t while (true) consume it? @PostConstruct public void processOrder() { ExecutorService e = Executors.newFixedThreadPool(2); ...
define a database model User interface User { id: string, name: string, xxxx: string, } define a DTO UserDTO interface UserDTO { id: string, name: string, } defines a method to get a user. generally, if we do not want to expos...
the first way: use CustomEvent provided natively by JavaScript to create custom events for example, you can create: var evt = new CustomEvent(type, {detail: msg, bubbles: true, cancelable: true}); then listen for and trigger a custom event element...
in the Android source code you read, where have you seen the singleton pattern used in the Android framework layer or third-party frameworks? What is the way to implement the singleton pattern? ...
problem description due to the needs of the project, to interface with N third-party API, and then convert the data returned by the request API into the data structure of your own project, the third API may be an encapsulated SDK, a URL, or a restful-...
< hr > look at the ArrayList parent structure first look at ArrayList signature public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable question: now that ...
when reading the design pattern of the Zen state pattern of the design pattern, why do you mention that the disadvantage of the state pattern is that there are too many subclasses, which will cause class expansion? is there any way to solve this problem?...
for example: has a Company company class, Company company class has a List < User > user list, and User class has an Address class that holds several addresses for users. well, now there is a system design idea: pass a company id to the backend, a...
FactoryBean is understood to revolve around , so what are the advantages of in software engineering or in using over BeanFactory in software engineering? Why should there be such a design pattern? ...
export const typeMarry = (type) => { const charts = [ pie , bar , line ], text = [ normalText , multText ], media = [ file , picture , music , video ] if(charts.indexOf(type) !== -1) { return CHARTS } ...
https: blog.csdn.net adoocok. in this article, MethodBeforeAdviceAdapter only implements AdvisorAdapter , and AdvisorAdapter itself does not extend functionality to any class or interface. Why is it an adapter pattern here? ...
A piece of code that abstracts the factory pattern in the book JavaScript Design pattern: var VehicleFactory = function(subType, superType){ if(typeof VehicleFactory[superType] === function ){ function F(){}; F.prototype = new V...
Why should the template pattern in the Java design pattern use abstract classes instead of interfaces? ...