there is a volatile attribute in the netty internal logging framework InternalLoggerFactory that defaultFactory, does not understand why the volatile keyword is added, and if it is to implement a singleton, why not add the getDefaultFactory method in th...
public class TestClass { int i = 0; volatile boolean tmpvo = false; public void one() { i = 1; tmpvo = true; } public void two() { if(tmpvo) { int j = i; ...... } } } suppose that after the one () metho...
for unprotected multithreads, it is uncertain when some data is modified in one thread and when it is submitted to main memory, and the values used by other threads are not necessarily up-to-date. in the case of volatile modification, it is guaranteed t...
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problem description learn the deployment of springboot. Nginx+ssl, is built on the server to handle all https requests and forward the requests to several springboot services, so that springboot itself does not have to deal with ssl-related. This part...
made a search function to get the data to refresh the list after searching. but paging is done in the background, because if enough content is found, it is not appropriate. the solution here is that the backend only returns 15 pieces of data at a time...
write a custom verification rule in the validator of tp5, and verify that the utf8 encoded character length of the input field is within 31 coding is not very good at conversion. In the previous paragraph, I did the page verification of js. The code i...
Open two scrapy tasks at the same time, and then go to push in redis a start_url but only one scrapy task An is running, and when An is stopped, B task will begin to crawl. the reason seems to be that requests is not saved in redis while...