Programmer Think

1, Definition Adapter Pattern: one of the structural patterns, which converts the interface of a class into another interface desired by the customer. The Adapter Pattern allows classes that cannot work together because of incompatible interfaces to work together. 2, UML class diagram 3, Roles and responsibilities Target role: this role defin ...

Let's review the recent conference of LLVM developers. The whole tutorial is very suitable for people without LLVM foundation to get started and operate a piece of LLVM code.PrerequisiteIR - > intermediate representation is the so-called intermediate representation. Generally speaking, the IR used by the compiler includes DAG, three address ...

Author | sparrow source| Alibaba cloud official account This article is from Arthas. It was submitted in March 2021. The way of participation in the award-winning essay in April can be seen at the end of the article. The project initially used Arthas for two purposes: Through arthas, we can solve the problem of realizing the performance ...

preface Recently, when debugging a monitoring application indicator, it was found that the timer did not execute after the service was started and executed once. The timer used here is the scheduling thread pool ScheduledThreadPoolExecutor of Java. Later, after troubleshooting, it was found that if the processing task of the ScheduledThreadPoo ...

ES6: ECMAScript6 I. new features of ES6 1.let variable declaration and declaration features 1.1 let Let keyword is used to declare variables. Variables declared with let have the following characteristics: let a; let b,c,d; let e = 100; let f = 521,g= 'iloveyou',h = []; 1. Variables cannot be declared repeatedly let star = ' ...

prefaceLast article I introduced some basic concepts of syntax parsing and how to realize the syntax tree parsing of Simple language interpreter through custom DSL language. In this and the last article in this series, I will introduce you how the Simple interpreter executes the generated syntax tree.evaluate function and scopeThe evaluate func ...

preface Before the launch of nacos, eureka was basically the first choice for the registration center of the whole family bucket system of spring cloud. With the emergence of nacos, more and more micro service projects based on spring cloud use nacos as the registration center, but does this mean that eureka has no place to use force? In fact, ...

0. Front The previous article recorded the Shell operation and Java API operation of HBase, but the operation process is still cumbersome [track of HBase] (2) use HBase command and Java API to operate HBase (including complex query - filter and HBase tool class) It would be nice if you could write SQL operation database like MySQL, and ...

Article cataloguepreface1. Definition of form2. Properties of form1, Form form1. Basic use of form2. Use built-in behaviors2.1 wx://form-field2.2 wx://form-field-group2.3 wx://form-field-buttonprefaceForm definition of form.1The form is mainly responsible for the data collection function in the web page. A form has three basic components: Form ...

The observer pattern defines a one to many dependency that allows multiple observer objects to listen to a subject object at the same time. When the state of the subject object changes, it will notify all observer objects so that they can update themselves automatically. -- Dahua design mode How would you write the code if you had to inform ...