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When the program is abnormal, it will return a lot of unfriendly content, which is very beautiful! When we write code, exception handling is usually try catch or throws Exception. As we all know, try catch takes up a lot of memory in the code and affects performance, and it is very tedious to add t ...

Semaphore semaphore The semaphore was used before the pipeline was put forward. Semaphore model One counter, one waiting queue, three methods. Counters and waiting queues are transparent to the outside world, so they can only be accessed through three methods provided by the semaphore model: init (), down (), up (). init(): Sets the initial v ...

Summary M2M (Machine-to-Machine) is an end-to-end communication technology. This chapter takes Node JS SDK as an example, uses Topic message routing based M2M device-to-device communication, mainly introduces how to build a M2M device-to-device communication architecture based on the Internet of Things platform. Experimental steps Part I: Conf ...

DoKV DoKV is a compact and powerful Key-Value management framework designed to solve all kinds of tedious and ugly configuration class codes on Android platform. Download dependencies { implementation 'leavesc.hello:dokv:0.1.8' annotationProcessor 'leavesc.hello:dokv-compiler:0.1.8' } If you don't want to customize the serialization sc ...

order This paper mainly studies the ListroFilter of nacos. CanDistro nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/web/CanDistro.java @Retention(RetentionPolicy.RUNTIME) public @interface CanDistro { } CanDistro is used to identify a method that needs to determine whether it should be redirected based on distro DistroFilter nacos ...

Way 1: Rewrite spring's default thread pool 1. Configuration of related parameters #Thread-related configuration #Number of core threads task.pool.corePoolSize: 5 #Maximum number of threads in thread pool task.pool.maxPoolSize: 20 #Maximum idle time of threads task.pool.keepAliveSeconds: 300 #Maxim ...

Background: ** In multithreaded programming, in order to avoid inconsistency of shared data, the operation of shared data must be locked. In java, synchronized keyword can be used to achieve exclusive lock, but there are two major drawbacks in using this keyword: 1. The blocking time of threads cannot b ...

title: Several methods of removing superfluous characters at the end of a string date: 2018-08-17 22:12:58 tags: [Java, method] --- When splicing strings, we often find many unwanted characters, which are very annoying. Here are three ways to get rid of annoyance. //Cyclic generation of json format data public static String CreateJson() { ...

The company's own ota upgrade apk, download upgrade package upgrade, prompt package compatibility verification failed; The errors reported by different OTA apks may be different, and the log s should be the same; 9.0 has strict authority management. avc: denied { read } for name="config.gz" dev="proc" i ...

Introduction of SPI implementation principle SericeLoader Load method Finding Implementation Classes Create examples SericeLoader from SPI Practical Learning in JAVA One of the most important ways to implement lookup is to: ServiceLoader shouts = ServiceLoader.load(Handler.class); Its class stru ...