Directory Foreword In multi-threaded programming, it is often necessary to implement a mechanism to coordinate the execution of multiple threads to ensure that certain operations are performed after all threads have completed. CountDownLatch is a synchronization tool provided in the Java concurrency package, which allows one or more threads to wait for other threads to […]
Tag: count
Strange things encountered in side missions – concurrent requests
Concurrent requests refer to the situation where one or more requests are always sent out at the same time. It does not mean that these requests are sent exactly at the same time, but within a period of time, these requests may be sent one after another due to small differences in time. These requests […]
[Jsp&Servlet] 1-1 creation, configuration, and problems encountered
1. IDEA creates Servlet project ①Create a Java Enterprise project and use Maven as the build tool ② Select Web Profile for libraries and frameworks ③Set path, name, etc. The created new project structure is as shown in the figure: 2. Implement Servlet interface For example, create a new Java class ServletDemo1: package com.example …; […]
Steam account switcher based on AutoHotkey
1. Interface display home page tray page 2. Principle and implementation Step 1: Obtain account information Read the loginusers.vdf login information file in the config folder under the Steam installation path to obtain the account name, nickname, offline status, and login time information. The file is as follows: Step 2: Write the logged in user […]
Questions about preempt count
preempt_count in Linux – Zhihu https://www.cnblogs.com/hellokitty2/p/15652312.html LWN: Four small discussions about preempt_count()! -CSDN Blog Mainly refer to these articles I have always believed that as long as in_interrupt() returns a non-zero value, it can be considered to be in the interrupt context. Even if in_interrupt returns a non-zero value in a kernel thread (such as […]
Gin framework-A summary of problems encountered in running the terminal and their solutions (1)
1. panic: html/template: pattern matches no files: `template/**/**/*` Terminal full text code: 10:3:12 app | [GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached. [GIN-debug] [WARNING] Running in “debug” mode. Switch to “release” mode in production. – using env: export GIN_MODE=release – using code: gin.SetMode(gin.ReleaseMode) 10:3:13 app | panic: html/template: […]
High-quality 51 microcontroller timer/counter explanation
Understand the timer/counter of 51 microcontroller in one article Foreword: Timer/Counter 1. Goals: 2. 51 microcontroller timer/counter 2.1. The essence of timer/counter 2.2. 51-core microcontroller fixed/counter design ideas 2.3 Working principle (compare the following text with the picture above to understand) Foreword: Most of the explanations about timers on the Internet start with an introduction […]
Method to obtain map boundary data in real time in November 2023, multi-level linkage of provinces, cities, counties and streets [attached real-time geoJson data download]
First, let’s take a look at the renderings Online experience address: https://geojson.hxkj.vip, and provide real-time geoJson data file download The downloadable data includes provincial-level geojson administrative boundary data, municipal-level geojson administrative boundary data, district/county-level geojson administrative boundary data, provincial, city, and county street administrative code four-level linkage data (accurate to the township/street level), provincial Five-level […]
Current limiting algorithm (counter, sliding time window, funnel, token) principle and code implementation
Article directory Preface 1. Counter (fixed time window) algorithm principle Code Problems 2. Sliding time window algorithm principle Code Problems 3. Leaky bucket algorithm principle Code Problems 4. Token bucket algorithm principle Code at last This article will explain these four current limiting algorithms in detail and output code examples for implementing the current limiting […]
hadoop mapreduce api calls WordCount native and cluster code
Run code natively package com.example.hadoop.api.mr; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import java.io.IOException; public class WordCount { /** * Text: refers to StringWritable * (LongWritable, Text) Input on the map side: these two parameters will never change, Text: text data, LongWritable: offset (offset […]