Python3 Standard Library: Managing concurrent operations in threading processes
1. Manage concurrent operations in threading processes
The threading module provides an API to manage the execution of multiple threads, allowing programs to run multiple operations concurrently in the same process space.
1.1 Thread object
The easiest way to use Thread is to instantiate a Thread object with a target function and call start() to ...
Posted by j.smith1981 on Sun, 29 Mar 2020 18:54:15 -0700
Spring Controller singletons and thread-safe things
Catalog
singleton scope
Prototype Scope
Does multiple HTTP requests execute serially or in parallel within the Spring Controller?
Implement singleton mode and simulate a large number of concurrent requests to verify thread security
Appendix: Spring Bean Scope
singleton scope
Each controller that adds @RestController or @Controller defaults to ...
Posted by Joshua4550 on Fri, 27 Mar 2020 21:56:23 -0700
python basic learning day12 generator and derivation
Add: the function cannot change the global immutable variable, and the variable variable can still be changed.
l1 = [1,2]
def a(l1):
l1.pop(1)
a(l1)
print(l1)
generator
Generator: the python community regards generator and iterator as the same kind, and the essence of generator is iterator. The only difference is that the generator is ...
Posted by dbrimlow on Thu, 26 Mar 2020 02:07:41 -0700
Netflix Hystrix service monitoring of Spring Cloud series
Actuator
In addition to service fault tolerance, Hystrix also provides near real-time monitoring function, which collects the service execution results and running indicators, the number of successful requests, etc. through the activator, and then accesses / Actor / Hystrix.stream to see the real-time monitoring data.
Add dependency
...
Posted by roninblade on Wed, 25 Mar 2020 20:10:13 -0700
The specific process of get(K key) and put(K key, V value) in HashMap
Said ahead
This article contains the handwritten generic HashMap < K, V > as a simplified version, only to understand the working process of get() and put() methods of HashMap, not Java source code.
get(K key) principle
First calculate the hash value corresponding to the key
int hash = key.hashCode();
//The hashCode() method here is the ...
Posted by wyrd33 on Sun, 22 Mar 2020 03:39:17 -0700
The simplest AQS in history
Reentrant exclusive lock
What is reentry:
public void say(){
synchronized(this){
System.out.println("1");
synchronized(this){ //If it's not reentrant here, the agent is stuck here, which is equivalent to deadlock
System.out.println("2");
}
}
}
Design exclusive lock
First, you need a state equal to 0, which means that no thread has ...
Posted by Fabio9999 on Sat, 21 Mar 2020 09:29:28 -0700
Player nickname generator の implementation C++
When we register the game, some user name games can be generated automatically. Let's take you to realize this function
Train of thought:
Use several containers to store many strings, and then use random numbers to call TA S
Here we use the string array, which is the code:
cout<<Where[rand()]<<"Of"<<Describe[rand()]< ...
Posted by SP8600 on Thu, 19 Mar 2020 11:23:38 -0700
DOM operation drop-down box move left and right
Page:
HTML section:
<style>
#sel{
width: 100px;
}
#unsel{
width: 100px;
}
</style>
</head>
<body>
<div>
<select id="unsel" name="" multiple="multiple" size="10">
<option> ...
Posted by Ange52 on Tue, 17 Mar 2020 11:33:01 -0700
CCF computer software ability certification test questions: 201403-3 command line options
Problem description
Please write a command line analyzer to analyze the options in the given command line. Each command line consists of several strings separated by exactly one space. The first of these strings is the name of the command-line tool, which is made up of lowercase letters. Your program d ...
Posted by peterj on Tue, 17 Mar 2020 00:14:20 -0700
Exception handling thrown by Spring security oauth2 ExceptionTranslationFilter
The core of Spring security is a set of filter chains. Project launch on autoconfig.
The core is the Basic Authentication Filter used to authenticate the user's identity;
One filter handles one authentication mode;
For the username password authentication filter,
Will check if it is a login requ ...
Posted by sharpmac on Mon, 16 Mar 2020 04:37:29 -0700