1. Zookeeper architecture The zookeeper server runs in two modes: standalone mode and quorum mode. Independent mode: There is a single server, and the zookeeper status cannot be replicated. Arbitra
Tag: usage
ZooKeeper implements distributed lock safety
Background ConnectionLoss link is lost SessionExpired session expired Bypass zookeeper broker for status notification leader election Disconnect from zkNode Do idempotent Static expansion, dynamic
Jetty installation, configuration, and use
Jetty is an open source servlet container, which provides a runtime environment for Java-based web content, such as JSP and servlet. Jetty is written in Java language, and its API is released in th
Spring boot integrated Rabbit MQ uses a first experience
First experience of using Spring boot integrated Rabbit MQ
First introduce several characteristics of rabbitMQ
Asynchronous Messaging
Supports multiple messaging protocols, message que
Command analysis NGINX access log
Commonly used advanced command methods for awk analysis logs Analyze access logs (Nginx as an example) Log format:
‘ $remote_addr-$remote_user [$time_local] “$request” $status $body_bytes_sen
Silverlight – Unable to create an “ObjectName” instance in Designer during use
I tried to bind the combo box item source to a static resource. I over-explained my example, so it’s easy to understand what I’m doing.
public class A: ObservableCollection
{
public A()
{
Use of objects and structures in SWIFT
Object class Student{
var name: String = “”;
var age: Int = 0;
init(name: String ,age:Int) {
self.name = name
self.age = age
}
}
let stu = Student(name: “xiao< span style="colo
Swift’s use of closed bag
The simplest way to write closures, here is the format {(parameters) -> return type in
statements
}
Examples
//let append = {(str1 aa:String ,Str2 bb: String)-> String in error, the c
SWIFT: If the Let statement is condition, you cannot use the array filter.
Suppose I have a set of usernames
let users = [“Hello”, “1212”, “12”, “Bob”, “Rob”] I want to get the first user whose name length is 2, so I filtered the array and got the first user
i
Promise’s basic usage
// Promise object, can save state
//Promise first step
// Asynchronous code is written in the Promise function Step 2
const promise = new Promise((resolv, reject) => {
// Promise has three