Programmer Think

preface This article mainly analyzes the source code of several main operations of XXL job. 1. Create actuator - dispatch center background On the background admin page, add an actuator. be careful: Select "automatic registration" (automatic registration method is introduced here)AppName corresponds to xxl.xml configured in the pr ...

Ordered table Function: supports all operations of hash table. Keys are organized in order (hash table is out of order)Time complexity: all operations are O(log N) levelImplementation method: (1) Red black tree (2)AVL (3)SBT (4) Skip list (1) , (2), (3) all attribute BST (balanced search binary tree) Search Binary Tree There are general ...

The two players play the role of cat and mouse respectively, and play the game on an undirected graph. They take turns. The form of graph is: graph[a] is a list, which is composed of all nodes b satisfying that ab is an edge in the graph. The mouse starts from node 1 and starts first; The cat starts from node 2 and starts the second. There is ...

1, Distributed transaction problem A business operation needs to be called remotely across multiple data sources or across multiple systems, which will lead to distributed transaction problems. give an example: Business logic for users to purchase goods. The whole business logic is supported by three micro services: Warehousing service: ...

5. Use and explanation of SpringCloud Netflix Config 5.1 introduction In the distributed system, due to the large number of services, the configuration files are scattered in different micro service projects, which is inconvenient to manage. The Spring Cloud Config component is mainly used to centrally manage configuration files. It supports ...

As the Spring Cloud Netflix project enters the maintenance mode (putting the module in the maintenance mode means that the Spring Cloud team will not add new functions to the module, but will only fix block level bug s and security problems), Alibaba team provides us with a new one-stop solution for microservice development See official in ...

Comparison of java objects Objectives of this section Raising questionsComparison of elementsComparison of objects in JavaComparison method of PriorityQueue in collection frameworkSimulate the implementation of PriorityQueue 1. Questions raised Last class, we talked about priority queue. When inserting elements into priority queue, there is ...

3. Use and explanation of SpringCloud Netflix OpenFeign Feign can hide the Rest request and disguise it as a Controller similar to spring MVC. It doesn't need to splice URL s, parameters and other operations by itself. Feign can take over these and complete them automatically. 3.1 use of Feign 3.1.1. Dependency import In the pom file of con ...

Before introducing the principle of interface isolation, let's take a look at the first example in the following example - counterexample 1, Examples 1. Counterexample (1) Class diagram description Because the class diagram is relatively clear, let's look at the class diagram first As you can see, DogPlays Java and CatPlays Java impl ...

backgroundGenerally, in order to better manage and maintain projects, projects are generally divided into business categories, such as commodities, orders, members, etc., resulting in many front-end projects (SPA, single page application) with different business responsibilities. Suppose there is a requirement that all front-end projects need t ...