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1. background With the popularity of microservice architecture, services are divided according to different dimensions. A request often involves multiple services. And many services may be distributed in thousands of servers, across multiple different data centers. In order to locate and solve the fault quickly and analyze the application perf ...

Definition: a multi-functional synchronization tool that allows one or more threads to wait until a set of operations performed in other threads are completed. Literally translates to "countdown latch.". Function: initialize CountDownLatch with the given count. Because of the call to the c ...

1, Demand analysis To climb the 24-hour hot list of novels on the start of Chinanet: https://www.qidian.com/rank/hotsales?style=1 As the first crawler, we only crawl the first page of each novel's name, author, type, and whether it is serialized. 2, Create project Open the command line, switch to th ...

This article was reproduced from the sheldon_blogs blog at https://www.cnblogs.com/blogs-of-lxl/p/10651611.html This article is for study and research purposes only. Please attach the original author's name and web address if you want to reproduce it 1. Treble mechanism on Android O In Android O, w ...

This question is already answered here: How do I make a flat list from a list? 45 answers Is there an easy way to understand lists to flatten lists of iterative objects, otherwise, if you don't think it's the best way to flatten such shallows, balance performance and readability? I tried to flatten such lists by understanding ...

Article directory .into(*) 1,Target 2,Request 3,track() 3.1 life cycle 3.2 requestTracker.runRequest(Request) 4,DecodeJob.run() 5,ModelLoader 6,HttpUrlFetcher 7, cache 8. Load picture summary Final personal summary .into(*) This method is very complex, you have to look at the source code sev ...

About generating QR code pictures: Using zxing package to generate QR code under Android The QRCodeUtil provided in is everything. Very convenient. About parsing the QR code picture, get the content: public Result parseInfoFromBitmap(Bitmap bitmap) { int[] pixels = new int[bitmap.getWidth() * bitmap.getHeight()]; bitm ...

Catalog Summary RMI Framework register MethodFactory MethodDefinition ProxyAnntotation Server RPCServer ServerExecutor ArgumentMaker configuration file Client ClientProxy ClientDialog RPCClient Load Balancing Interface summary Summary RPC (Remote Procedure Call Protocol) A remote proced ...

There is a log library for developers to use in boost, but the efficiency is not the highest: Add the header file "include < boost / log / trial. HPP > to import the log Library The log Library in boost has the following six levels: BOOST_LOG_TRIVIAL(trace) << "A trace severity message" ...

A 15 and 20 Portal Simulation direct up #include<bits/stdc++.h> using namespace std; int main() { int t; scanf("%d",&t); while(t--) { int a1,b1,c1; scanf("%d%d%d",&a1,&b1,&c1); int a2,b2,c2; scanf("%d%d%d",&a2,&b2,&c2); ...