microgrid concept

sharing of the same application, but also realize the security sharing of public resources of different applications.3, Semaphore: It allows multiple threads to access the same resource at the same time, but needs to limit the maximum number of threads accessing this resource at the same time ;4. Events: It is also convenient to implement a priority comparison of multiple threads by keeping the threads synchronized in a notification operation .Iii. why multi-threaded programming is requiredThe

virtual hardware to running an application on an operating system that uses a specific logical resource. This provides ISSS flexibility while providing the simplicity of the PAAs, and is much more than running 12-factor applications. separation of concerns for development and operations : Provides a separation of build and deployment, and thus decoupling the application from the infrastructure. Agile Application creation and deployment : Container mirroring is more lightweight and effic

CSS is the abbreviation of the English cascading style Sheets , CSS is currently the latest version of CSS3, is able to truly achieve Web page performance and content separation of a style design language. Compared to the performance of traditional HTML, CSS can control the placement of objects in the Web page with pixel-level precision, support almost all font size styles, have the ability to edit Web objects and model styles, and be able to conduct preliminary interaction design, is currently

One, the communication between components The scope of the component instance is orphaned, which means that the data of the parent component cannot and should not be referenced directly within the child component's template. However, there is a need for communication between parent and child components, which the child component needs to communicate to the parent component to pass data to the child component. in Vue.js, the parent-child component's relationship can be summarized as props do

', port)) Gevent_server.listen () while True: CLI, addr = gevent_server.accept () Gevent.spawn (HANDLE_REQUEST,CLI) def handle_request (conn): try: while True: data = CONN.RECV (1024x768) print ("recv:", data) conn.send (data) if not data: Conn.shutdown (socket.) SHUT_WR) except Exception as ex: print (ex) finally: conn.close () if __name__ = = "__main__": Server (8001)There are two t

inherited structure, the order of execution is to first execute the static block of code from the topmost class to the lowest level, then execute the construction method from the top to the bottom. You cannot access a non-static member variable in a static method, you can access a static member variable in a static method, or you can access a static member variable in a non-static method. The this pointer cannot be used in static, which refers to the current instance.This article is from the "L

the substance.3, GeneratorThe generator function implements true asynchronous control that switches the execution environment and passes variables between execution environments to implement collaborative function threads.The well-known co modules, combined with promise and generator, enable synchronous coding of asynchronous processes.4. Async functionThe ES2017 standard introduces an async function that makes asynchronous operations easier. Is the syntactic sugar of the Generator function.The

Closures: The main role is to encapsulate variables, convergence permissions. Prevent the variable from being contaminated. For example, the jquery framework uses a large number of closures. Why is it?Ask a question? How does the framework avoid conflicts between the variables you declare and the variables that it comes from????? Obviously, need to close the bag!!! Valid only in the scope that you define.The concept and usage of closure in JS

The most classic introduction to the concept and usage of the ASP.Abstract Factory mode provides the client with an interface that enables the client to create objects in multiple product families without having to specify a specific type. This article still takes the example of the fast food restaurant that followed.Now, fast food restaurants often good, gradually grow, in order to fit different local people's eating habits, created two series (equiv

To figure out these three methods, you first need to understand the concept of capturing groups in a Java regular expression. The capturing group is also the sub-pattern of the pattern in parentheses to "()". The main reason to use capturing groups is to find out what you care more about in a match.Capturing groups can be numbered by calculating their opening brackets from left to right. For example, in an expression "(x) (y\\w*) (z)", there are three

a "read-modify-write" sequence of operations, and the resulting state depends on the previous state.In concurrent programming, incorrect results due to improper execution order is a very important case, the race condition (Race Condition).Race conditionA race condition occurs when the correctness of a calculation depends on the alternating execution timing of multiple threads. The most common race condition is the "check after execution (check-then-act)" operation, which determines the next act

be taken out, but directly execute.So, what is the sequence of these two functions executing? No hurry, let's debug: var getUserInfo = function () { console.log(‘aaa‘); $.getJSON("http://www.easy-mock.com/mock/5a09868228b23066479b8379/ajaxData/getUserInfo", function () { console.log(‘bbb‘); return data; }); } var data = getUserInfo(); console.log(data); console.log(‘ccc‘); renderUserInfo(data); The output of sequenti

of the window to interact with the external user (another system) of the perspective of the interface to the user to commit to the system to provide what services, stand in the system itself, the interface of the system must implement what services, An interface is the highest-level abstract type in a system. Interface interaction can improve the coupling system between two systems A through system B interaction, refers to system a access to system B, the reference variable is declared as the i

is the process and data surround, access to data only through the defined interface. Object-oriented computing begins with the basic concept that the real world can be depicted as a series of fully autonomous, encapsulated objects that access other objects through a protected interface.4. Polymorphism:Polymorphism refers to allowing objects of different classes to respond to the same message. Polymorphism consists of parametric polymorphism and inclu

It is sometimes necessary to manipulate arrays when writing webclinet-side scripts, and the syntax for declaring arrays in JavaScript is Dim variable = new Array (); It should be noted that there is no two-dimensional array concept in JavaScript, only one-dimensional. Cases: One-dimensional array generation, assignment, display methodfunction GetArray (){var arr = new Array ();Arr[0] = "0";ARR[1] = "1";for (i=0;i{Alert (Arr[i]);}} Two-dimensional arra

Block chain is a new application mode of computer technology such as distributed data storage, point-to-point transmission, consensus mechanism and encryption algorithm. The so-called consensus mechanism is a mathematical algorithm for building trust and acquiring equity between different nodes in block chain system. The concept of Bitcoin (BitCoin) was first proposed by Ben Cong in 2009, based on the idea of Ben Cong to design the release of open sou

call the receive function in CSocket, and if there is no data in the buffer, the function waits until the data is returned. At this point, the current thread will continue to process a wide variety of messages. If the main window and the calling function are in the same thread, unless you call in a special interface operation function, the main interface should still be refreshed. Another function of the socket receiving data recv is an example of a blocking call. When the socket is working in

call mechanism, is said here services. 3,web Services is the raw material for SOA. It addresses compatibility issues with other remote invocation mechanisms. It has nothing to do with any language or platform. Almost all remote invocation mechanisms can generate Web Services. WEB Services is the world language for remote service. Although SOA may not necessarily be Web services, the proposed SOA concept and today's buzz are largely due to the global

The difference between truncate and delete and the basic concept of DDL,DML,DCL,TCL Understand DDL,DML,DCL,TCL Basic Concepts First For SQL languages, there are two components: DML (Data Manipulation language): They are select, UPDATE, INSERT, DELETE, just like its name, these 4 commands are the languages used to manipulate the data in the database. DDL (data Definition Language): DDL is more than DML, the main commands are create, ALTER, dr

Disk IOPS concept and IOPS calculation and test http://ce.sysu.edu.cn/hope/Item.aspx?id=12630 echo "The SYSTEM Metric of the" last $start days to $end days: "Sqlplus-s "/As SYSDBA" Set Lines 180Set pages 70Alter session set nls_date_format= ' Mm-dd hh24:mi:ss ';Col phyread_total_mbps heading "phyr| MBps format 999.99Col phywrite_total_mbps heading "phyw| MBps format 999.99Col redo_mbps heading "redo| MBps Format 99.99Col phyread_iops heading "phyr| I