Programmer Group

This article is excerpted from "design patterns should be learned this way" 1. Application scenario of factory method mode The factory method mode is mainly applicable to the following application scenarios. (1) Creating objects requires a lot of repetitive code. (2) The client (application layer) does not depend on the details of ho ...

This article is excerpted from "design patterns should be learned this way" 1 encapsulate product creation details using simple factory mode Next, let's look at the code and take the creation of an online course as an example. Assuming that there are courses such as Java architecture, big data and artificial intelligence, an ecosyste ...

This article is excerpted from "design patterns should be learned this way"1 encapsulate product creation details using simple factory modeNext, let's look at the code and take the creation of an online course as an example. Assuming that there are courses such as Java architecture, big data and artificial intelligence, an ecosystem h ...

RPC (remote procedure call) remote procedure call RPC is used to communicate between the Java processes of two hosts in distributed applications. When host A calls the methods of host B, the process is simple, just like calling the methods in its own process. The responsibility of RPC framework is to encapsulate the details of the underlying c ...

Microservice Architecture Foundation (II) To be continued Continue the previous basic project for expansion Load balancing and service invocation Ribbon Ribbon local load balancing client & nginx server load balancing difference Nginx is server load balancing. All client requests will be handed over to nginx, and then ngin ...

1: Introduction to thread pool Using thread pool, you can reuse threads and control the total number of threads. If the thread pool is not used, a new thread should be opened for each task. The overhead of repeatedly creating threads is large, and too many threads will occupy too much memory. This is too expensive. We want to have a fixed num ...

The Liskov Substitution Principle (LSP) means that if there is an object O2 of type T2 for each object O1 of type T1, so that the behavior of program P does not change when all objects O1 defined by T1 are replaced with O2, then type T2 is a subtype of type T1. This definition looks quite abstract. Let's re understand it. It can be understood ...

2.3 mount Mount: the act of associating an additional file system with an existing directory in the root file system, so that this directory can be used as an access to other files Uninstall: the process of releasing this association Associate a device with a mount Point: mount Point The original files under the mount point will be temporar ...

The following is the RocketMQ - Producer series article index: 1: Start the process (this article) 2: Routing dynamic updates 3: Send Mode Analysis + Message Type Difference 4: Sending process of producer message 5: Routing queue selection, client redundancy policy (QA) Introduction to Producer Producer is the sender of the Ro ...

#Unified identity management platform IAM Many enterprises have multiple office systems. Accounts, passwords, roles and permissions need to be set separately and cannot be managed uniformly. I think the unified identity authentication management system IAM has the following three advantages: Establish a unified user management, identity rati ...