Programmer Think

Collect a lot of anti - Crawler sites, there is a very good tool: Octopus... Directly through the browser access, a force to break ten thousand methods Preparatory work: money, spend money to buy members of Octopus website for a month or more, so that you can do Cloud Collection Next, grab the data by yourself. After the grab, set the timing ...

1, Service provider and service consumer Using microservices to build distributed system, microservices communicate with each other through network. We use service providers and service consumers to describe the invocation relationship between microservices. noun definition Service provider The callee of the s ...

1 General Visitor pattern is a behavior pattern, which is not commonly used. It can separate the algorithmic logic acting on the object from the object itself. 2 visitor mode When we need to operate on a group of similar types of objects, we can maintain the operation logic within each object separately, but this violates the principle of singl ...

Chain of Responsibility Pattern It gives multiple objects the opportunity to process the request, thus avoiding the coupling between the sender and the receiver of the request. Connect these objects into a chain, and pass the request along the chain until there is an object to handle it. motivation Each processing object determines which com ...

First C#Program using System; namespace HelloWorldApplication // Namespace Declarations { /* Class name is HelloWorld */ class HelloWorld // A class { /* main function */ static void Main(string[] args) { /* My First C#Program */ Console.WriteLine("Hello World!"); Co ...

If Maven's dependency is not handled properly, it often leads to some problems, which is very annoying. Today I'd like to share with you a dependency related problem that you may have encountered before. Problem background There is an ES search project, which is still in good condition at the beginning. After a while, it is found that the start ...

brief introduction In the previous article, we introduced the use of jstat tool in JDK14. In this article, we will further explore the use of jstack tool. jstack tool is mainly used to print java stack information, mainly java class name, method name, bytecode index, row number and other information. More highlights: Blockchain from getting st ...

Opening Through the previous article Istio Sidecar injection principle It can be found that the Sidecar application has been injected at the same time when the application is submitted to the kubernate deployment. If you are careful, you can also find that in addition to the application of istio proxy, there is also an Init Containers of istio ...

  Lock   It's like a synchronization block, java.util.concurrent.locks.Lock Is the thread synchronization mechanism. However, locks are more flexible and complex than synchronous blocks. Because lock is an interface, you need to use one of its implementations to use lock in your application. ReentrantLock is one such implementation of ...

Preface In the actual development process, we often encounter businesses that require multi-threaded concurrency. Finally, we need to summarize the tasks completed by each thread, but the main thread usually ends earlier than the sub-threads. If you want to wait for each sub-thread to finish before running the main thread, you need to identify ...