Tag：case
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Time：2021-7-27
Why message queuing Asynchronous processing: suppose an interface has three ABC operations, operation a can be completed quickly, but the BC operation is time-consuming. At this time, the BC operations can be put into the message queue and returned directly, so as to reduce the waiting time of the interface. flow control: suppose that our […]
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Time：2021-7-22
Three pointer methods: Wait() for goroutine to accept notification, single() broadcast() to unblock If there are multiple goroutines, only one will be selected Broadcast () broadcast method to everyone The following is the underlying execution process of the wait method Try to unlock Wait attempts to unlock. After unlocking, it waits for other notifications, = […]
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Time：2021-7-13
Link to the original text:http://tecdat.cn/?p=8502 There are many ways to identify outliers, and there are many different ways in R. The article on outlier method combines theory and practice. The theory is fine, but outliers are outliers because they don’t followtheory。 If a method finds outliers that we all agree with, then this method can […]
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Time：2021-7-7
1： Background I believe many people know that through theTask ManagerGrabbing dump is simple and crude, but it can’t meet the numerous dead methods of the program Memory expansion, program explosion The CPU explodes high, the program is exhausted Application does not respond, users are angry Unexpected exit, just like life Since the manual is […]
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Time：2021-7-7
preface Last articleBased on two cases, we understand the locking process of reentrant lock. Next, let’s continue to understand its unlocking process based on the same case. Two cases 1. Thread a locks and unlocks separately2. When thread a is holding the lock, thread T1 will lock it. After thread T1 is blocked, thread a […]
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Time：2021-7-6
brief introduction When you use laravel, you are shocked by the power of laravel. In developing laravel projects, you often use the artisan command. It’s very convenient to use the artisan command, especially when creating controller or model. However, in the company, you often encounter the problem that the project Abstracts Service and repository layers, […]
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Time：2021-7-4
A series of articles： Introduction to rabbitmq Mac install rabbitmq Install rabbitmq in Ubuntu Rabbitmq usage scenarios Rabbitmq components and architecture Rabbitmq code example Rabbitmq introduction case – fanout mode Rabbitmq introduction case – work mode – polling mode Rabbitmq – springboot case – fanout mode Rabbitmq – springboot case – direct mode Rabbitmq – […]
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Time：2021-7-4
Case description: Today, I encountered an interesting SQL Server job error alarm. The details of the error are as follows: Date 2021/6/23 12:34:00 Log Job History (YourSQLDba_BlockingSQL_Alert) Step ID Server xxxxx Job Name YourSQLDba_BlockingSQL_Alert Step Name Duration 00:00:06 Sql Severity 0 Sql Message ID 0 Operator Emailed Operator Net sent Operator Paged Retries […]
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Time：2021-7-4
preface Hello, I’m bigsai. Today we’re doing the actual combat of JDBC + MYSQL, which is very suitable for beginners to open a new world. Implement an example of adding, deleting, modifying and checking (curd).First like and then watch, handsome boys and girls to develop a good habit! Before this case, you need to make […]
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Time：2021-7-3
A series of articles： Introduction to rabbitmq Mac install rabbitmq Install rabbitmq in Ubuntu Rabbitmq usage scenarios Rabbitmq components and architecture Rabbitmq code example Rabbitmq introduction case – fanout mode Rabbitmq introduction case – work mode – polling mode Rabbitmq – springboot case – fanout mode Rabbitmq – springboot case – direct mode Rabbitmq – […]
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Time：2021-7-2
A series of articles： Introduction to rabbitmq Mac install rabbitmq Install rabbitmq in Ubuntu Rabbitmq usage scenarios Rabbitmq components and architecture Rabbitmq code example Rabbitmq introduction case – fanout mode Rabbitmq introduction case – work mode – polling mode Rabbitmq – springboot case – fanout mode Rabbitmq – springboot case – direct mode Rabbitmq – […]
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Time：2021-7-1
This article first appeared inArray_HuangOur technology blog——Practical firstPlease do not reprint without the author’s permission.Original address:https://segmentfault.com/a/1190000007522378 Project GitHub:https://github.com/Array-Huang/canvas-learning Case 1: tic tac toe Case 1-1 Some basic APIs of canvas are simply applied, such as drawing basic graphics and path. Case 1-2 Practice usingPath2DcoordinationtranslateTo reuse the path. Case 2: brick laying Practice a batch of […]
