in memory cache node js

matter which part of the code you modify, you have to terminate node. JS and re-run to be effective. This is because node. js only parses the script file the first time it is referenced to a part, and then accesses the memory directly, avoiding repeated loading, while PHP a

Node. js development-Stream usage StreamIt is a very important module in Node. js and is widely used. A stream is an interface capable of reading, writing, or reading and writing. Through these interfaces, we can interact with disk files, sockets, and HTTP requests, enables data to flow from one place to another. All s

read operation is performed, I thought there would be an Error: EBADF, And the read result does not exist. The following code attempts to create a BUG: //...Fs. closeSync (fd );Fs. readSync (fd, new Buffer (1024), 0, 1024 );//... However, this error will be much more friendly, with the call stack opened. Fs. js: 552Var r = binding. read (fd, buffer, offset, length, position );^Error: EBADF, bad file descriptorAt Error (native)At Object. fs. readSync

First, installation environment1. Native System: Windows 7 Flagship edition (64-bit)2, node.js:node-v8.2.1-x64Ii. Installing the node. JS Step1, download the corresponding system node. JS Version: https://nodejs.org/en/download/2, choose the installation directory for installation (not recommended to install directly o

Worker processes, instead of multithreading + Shared Memory + locking, Although the shared memory performance is good, but there are security problems, the need for read/write locks. The granularity of the lock is too large, so only one thread is running. The lock is too complex and has a deadlock problem. Therefore, developers need to be very careful. 3. swoole coding is synchronous, not nested asynchrono

PHP is better than Node. js for five reasons. PHP is a server-side scripting language mainly used for dynamic web page development. it is one of the most popular development languages. Node is a JavaScript code PHP program used to write high-performance network servers. it is a server-side scripting language mainly used for dynamic web page development and is one

Document directory Understanding callback Mode Understanding event transmitter Mode Understanding event types Use the event transmitter API Create an event Transmitter For the list of articles in this series and the translation progress, see Node. js advanced programming: using Javascript to build scalable applications (〇) This article corresponds to the first part of the original article, Chapter

("./circle.js");//require通过引入模块文件，找到exports对象提供的接口console.log("The area of a circle of radius 4 is " + circle.area(4));Writing a slightly larger program typically blocks the code. In NodeJS , the code is generally reasonably split into different JS files, each file is a module, and the file path is the module name.When writing each module, there are require、exports、module three pre-defined variables available for use.The module name can use a relative

business logic cannot be distributed across multiple processes and the transaction length is much larger than multithreaded mode.The necessity of asynchronous IOThe total time spent on these two tasks by a program that synchronizes is M + N. However, if you are using an asynchronous program, the time overhead will be reduced to Max (M, n) in situations where two I/O can be parallel (such as network I/O and file I/O). And when parallel tasks are more, M + N + ... With Max (M, N, ...) The best of

In the first 100 dependent libraries, underscore is the language base class, Express is the server framework, there are 5, 6 test frameworks, and 5, 6 recursive traversal of the directory tree of the tool class, 3 about the command Line parsing tool class, 3 main database link client library, 2 WS library, Multiple JS/CSS front-end processing toolchain, 3-4 promise libraries, multiple template libraries, multiple jquery/cavans/dom emulators and parser

process server. When a request causes an unknown error, the whole server is affected. 　　4. PHP process is short In PHP, each process has a short request duration, which means you do not have to worry about resource configuration and memory. Node takes a long time to run during the process. You need to be careful and properly manage the memory. For example, if yo

problem, here are just a few things we do: For files that specify several suffixes, add the Expires header and the Cache-control:max-age header in response. The timeout date is set to 1 years. Because this is a static file server, the last-modified header is returned for all requests, in response. For the request header with If-modified-since, make a date check, and if not modified, return 304. If modified, the file is returned.

Use webstorm and git to develop node. js applications 1. Use webstorm to create an express Project1. Create a projectFile | new project, first select location as D: \, enter the project name caller, and select the node. js Express project.2. modify the configuration: Smart sensingFile | setting | JavaScript |

Note the use of stream Writing Tools in NODE. JS. The stream in Node. js is very powerful. It provides support for processing potential large files and abstracts data processing and transmission in some scenarios. Because it is so easy to use, we often write some tool functions/libraries based on it in practice, but it

Copyright belongs to the author.Commercial reprint please contact the author for authorization, non-commercial reprint please specify the source.FengqiasiaLinks: http://www.zhihu.com/question/19653241/answer/15993549Source: KnowTo get this straight, let's talk about bottlenecks in the entire Web application architecture, including traffic, processor speed, and memory speed. The bottleneck is the maximum number of concurrent connections that the server

Document directory Use setTimeout to delay function execution Use clearTimeout to cancel an execution plan Develop and cancel repeated execution plans for Functions Use process. nextTick to delay function execution to the next round of the event Loop Congestion event Loop Exit event Loop Use setTimeout instead of setInterval to ensure the serialization of function execution For the list of articles in this series and the translation progress, see