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How SpringBoot integrates Redisson to implement delay queue

Usage scenario 1. The order was placed successfully but the payment was not made within 30 minutes. The payment timed out and the order was automatically canceled. 2. The order was signed and no evaluation was conducted for 7 days after signing. If the order times out and is not evaluated, the system defaults to a positive rating. 3. The order is placed successfully. If the merchant does not receive the order for 5 minutes, the order is cancelled. 4. The delivery times out, and push SMS reminder... For scenarios with long delays and low real-time performance, we can Use task scheduling to perform regular polling processing. For example: xxl-job Today we will pick

May 30, 2023 pm 02:40 PM

SpringBoot redisson

Redis cache and MySQL data consistency methods

Cause of demand In high-concurrency business scenarios, the database is in most cases the weakest link for concurrent user access. Therefore, you need to use redis to perform a buffering operation so that the request can access redis first instead of directly accessing databases such as MySQL. This business scenario mainly solves the problem of reading data from Redis cache. Business operations are generally carried out according to the process in the figure below. There is generally no problem in reading the cache step, but once data updates are involved: database and cache updates, data consistency issues between the cache (Redis) and the database (MySQL) are prone to occur. Whether it is writing the MySQL database first and then deleting the Redis cache; or deleting the cache first and then writing the database,

May 29, 2023 pm 08:17 PM

MySQL redis

How often does the queue consume in laravel?

Laravel is a popular PHP development framework. Its queue system allows us to easily handle asynchronous tasks, such as sending emails, generating reports, etc. As for the consumption frequency of the queue, this is a very practical issue and is also a concern of many developers. First, it's important to understand the basic principles of Laravel queues. The Laravel queue system is based on the message queue. It puts the tasks that need to be processed into the queue and then processes these tasks through an asynchronous process. In this process, we can configure the queue's "connector"

May 29, 2023 am 10:09 AM

What are the knowledge points of the redis project?

Highlights of the project: 1. Using distributed Seesion, multiple servers can respond at the same time. 2. Use redis as cache to improve access speed and concurrency, reduce database pressure, and use memory tags to reduce redis access. 3. Use page staticization to speed up user access, improve QPS, cache pages to the browser, and separate front-end and back-end to reduce server pressure. 4. Use the message queue to complete asynchronous ordering, improve user experience, and reduce peak and flow rates. 5. Security optimization: double md5 password verification, flash kill interface address hiding, interface current limiting and anti-swiping, mathematical formula verification code. Main knowledge points: Distributed Seesion Our flash sale service, the actual application may not only be deployed on one server, but distributed

May 27, 2023 pm 07:55 PM

redis

What is the update strategy for MySQL database and Redis cache consistency?

1. Update strategy 1. If there is data in Redis, it needs to be the same as the value in the database. 2. If there is no data in Redis, Redis must be updated synchronously with the latest value in the database. 2. Read and write cache 1. Synchronous direct write strategy writes to the database and writes to the Redis cache simultaneously. The cache and the data in the database are consistent; for read and write cache, to ensure that the data in the cache and the database are consistent, it is necessary to ensure that the data in the cache and the database are consistent. Write a strategy. 2. Asynchronous write delay strategy: When some businesses are running, after MySQL data is updated, Redis data is allowed to be synchronized after a certain period of time, such as logistics systems. When an abnormal situation occurs, the failed action has to be re-patched, and it needs to be rewritten with the help of rabbitmq or kafka.

May 27, 2023 pm 03:11 PM

MySQL redis

How to learn golang

1. Introduction Golang (or Go) is a programming language developed by Google. It is designed as a system programming language with efficient parallel processing and garbage collection functions. Since its first launch in 2009, Golang has been accepted and used by more and more programmers. Its efficient performance, simplicity and ease of learning, and improved development efficiency have attracted more and more programmers to turn to Golang. This article will explain in detail how to learn golang. 2. Preparation work Before learning golang, we need to make relevant preparation work first.

May 27, 2023 pm 01:49 PM

How to synchronize MySQL data to Redis cache

1Mysql checks the data and then writes it to Redis synchronously. Disadvantage 1: It will cause delay to the interface, because synchronous writing to redis itself has delays and requires retrying. If redis writing fails, it needs to be retried. Then It's even more time consuming. Disadvantage 2: No decoupling. If redis crashes, the thread will be blocked directly. Disadvantage 3: If someone is the database, it cannot be synchronized unless the corresponding Redis is manually deleted, but there is also a time difference in the process of deleting Redis. 2Mysql check After completing the data, send MQ to synchronize Redis in the consumer thread. Disadvantage 1: There are more layers of MQ, which means there is a high probability of causing synchronization delay problems. Disadvantage 2: Prevent the availability of MQ. Disadvantage 3: If

May 27, 2023 am 09:08 AM

MySQL redis

What are the implementation methods of distributed scheduled tasks in PHP7.0?

With the continuous development of web applications, distributed scheduled tasks have gradually become one of the necessary tools for web developers. There are many ways to implement distributed scheduled tasks in PHP7.0. Let’s take a closer look at their characteristics and usage methods. Redis implements distributed scheduled tasks. Redis is a high-speed memory-based key-value database used to store and access various types of data. In PHP7.0, Redis can be used to implement distributed timing tasks, which has the following advantages: Fast speed: Re

May 27, 2023 am 08:24 AM

分布式 PHP 定时任务

thinkphp implements sequential addition of queues

1. Introduction With the development of the Internet and the increasing number of applications, task queue has become a very important technology. Through queues, we can process heavy tasks asynchronously, thereby improving application performance and processing efficiency, while also avoiding problems such as blocking of some requests. In previous applications, we may use some third-party queue services, such as RabbitMQ, Redis, etc. Of course, these queue services themselves are very mature and powerful, but they also have some shortcomings, such as requiring additional configuration, installation,

May 26, 2023 am 09:46 AM

Queue technology in PHP

In the field of web development, queue technology is a very common technology. This technology can help developers handle a large number of asynchronous tasks, thereby improving the performance and speed of web applications. In the PHP language, queue technology has also been widely used. This article will introduce some queue technologies in PHP. 1. Overview of queue technology Queue technology is an event-driven programming technology that allows programs to process a large number of tasks asynchronously, thereby improving program performance and response speed. Queue technology first puts the tasks that need to be processed into the queue, and then

May 25, 2023 am 09:10 AM

消息队列 PHP队列队列技术

How to use java weak references in combination with queues

1. Instructions for use: Weak references can be used in conjunction with reference queues. The weak reference objects will be garbage collected, and the Java virtual machine will add the weak references to the reference queue related to them. 2. Instance publicclassGCTarget{//ID of the object publicStringid;//Occupied memory space byte[]buffer=newbyte[1024];publicGCTarget(Stringid){this.id=id;}protectedvoidfinalize()throwsThrowable{//Print when performing garbage collection Display object IDSystem.out.println(

May 24, 2023 pm 03:43 PM

Java

PHP implements efficient technology in the process of mass mailing

With the popularity of the Internet, email has become an indispensable communication method in people's daily life and work. Mass mailing is an extremely common operation behavior in email communication, such as sending announcements, event notifications and other information in batches. However, the process of mass mailing involves a large number of mail sending, receiving and processing processes. Therefore, in order to ensure the efficiency and quality of mass mailing, it is necessary to use various high-efficiency technologies to improve the speed and accuracy of mass mailing. This article will introduce the efficiency of PHP in the process of mass mailing

May 24, 2023 am 08:22 AM

PHP、邮件群发、高效性技术

How to use the flash sale plug-in of PHP Developer City

With the continuous development of the e-commerce market, the methods of selling goods are also constantly updated and iterated. Among them, flash sale activities have become an important part of e-commerce platform marketing, which can attract more users' attention and increase sales. The core of the flash sale activity is an efficient and stable flash sale plug-in. This article will introduce how to use the flash sale plug-in of PHP Developer City. 1. Understand the principle of flash sale plug-in Before developing the flash sale plug-in, we need to understand the principle of flash sale first. When conducting flash sales activities, a time period is usually set, and users can only

May 22, 2023 pm 11:31 PM

商城开发 PHP秒杀插件插件开发

How to create objects in java

1. Check whether the class is loaded. When the virtual machine encounters the new instruction, it first checks whether the parameter of the instruction can be located as a symbol reference of a category in the constant pool, and checks whether the category represented by the symbol reference is loaded, analyzed, and initialized. Otherwise, perform the class loading process. 2. Allocate memory for the target. After class loading is complete, the virtual machine begins allocating memory for the target, at which point the required memory size is determined. Just allocate the necessary memory on the heap. 3. Initialize the allocated storage space with a zero value. After the memory allocation of the object is completed, the memory space of the object needs to be initialized to zero to ensure that the object can be used directly even if it has no initial value. 4. Make other settings for the audience. After allocating memory space and initializing the zero value, the virtual machine still needs to perform other operations on the object.

May 21, 2023 pm 09:58 PM

Java