WebSocket and SSE Overview WebSocket Basics Definition: WebSocket is a full-duplex connection upgraded after an HTTP handshake, allowing clients and servers to push data bidirectionally over the same TCP channel, eliminating the need for repeated polling. Handshake Process: The client initiates an HTTP request with the Upgrade: websocket header; The server responds with 101 Switching Protocols, and both parties agree...
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Order transactions, whether deducting inventory first or later, will both affect inventory and orders. Therefore, distributed transactions must be used to address business issues (e.g., unpaid orders). One approach is to deduct inventory only after successful payment (e.g., an order was placed, but there was no inventory at the time of payment). Another common method is to deduct inventory when the order is placed, but if payment isn't made, the order is returned/released upon timeout.
Transactions and Distributed Transactions
1. What is a transaction?
A transaction is an important concept in database management systems. It is a collection of database operations, which either all execute successfully, or all...
Project Structure Description: The user-web module is the user service Web layer module within the joyshop_api project, responsible for handling user-related HTTP requests, parameter validation, business routing, and calling backend interfaces. Below is the directory structure description: user-web/ ├── api/ # Controller layer, defines business interface processing logic ├── config/ # Configuration module, contains system configuration structs and reading logic ...
protoc-gen-validate: Introduction and Usage Guide ✅ What is protoc-gen-validate? protoc-gen-validate (PGV for short) is a Protocol Buffers plugin used to add validation logic for struct fields in generated Go code. It automatically generates validation code for each field by adding validation rules in .proto files, saving you the trouble of manually...
Classes in JavaScript function PersonType(name){ this.name = name; } PersonType.prototype.sayName = function(){ console.log(this.name) } var person = new PersonType("Nicholas") p…
grpc grpc grpc-go grpc seamlessly integrates protobuf protobuf. For those of you accustomed to using JSON and XML data storage formats, I believe most have never heard of Protocol Buffer. Protocol Buffer is actually a lightweight & efficient structured data storage format developed by Google, and its performance is truly much, much stronger than JSON and XML! protobuf…
