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Design principles of design patterns (medium)Interface Segregation Principle, then multiple interfaces are used instead. Each interface serves only one submodule. This is similar to the single responsibility principle shared for the last time. Purpose of designing the interface isolation principle: when designing an application, if a module contains multiple sub-modules, We Should abstract the module. Imagine that this module is implemented by a class

8. Form formAdd the. Pure-form class to the Form tab to generate a single-line form (inline)：Code:Add a. pure-form-stacked class in the Form tab to generate a stack-form：Code:Add the. pure-form-aligned class to the Form tab to create a sort form：Code:By combining with a responsive grid (Responsive-grids), you can generate multiple list orders：Code:By adding to the fieldset. Pure-group class, you can group elements：Code:Controls the size of the form element, which can be implemented by adding a.

C # medium ?? And? What do they mean ?,In C ?? And? What do they mean? 1. Can be empty type modifier (?) :The reference type can use null reference to indicate a nonexistent value, while the value type cannot be null.For example, string str = null; is correct, int I = null; the compiler reports an error.To make the value type empty, you can use the void type, that is, the void type modifier "? "T? "Example: int? It indicates an integer that can be nu

, consider the use of distributed file systems, such as Glusterfs, Moosefs and so on.Drbd+heartbeat+nfs Blog: http://lizhenliang.blog.51cto.com/7876557/1362539Layer Sixth: Database cachingUsing the cache technology, the hot data is cached in memory, if the requested data in the cache, it is returned directly, otherwise go to the database, and update the data to update to the cache system, improve read performance, reduce database pressure. The cache implementation has both local and distributed

baselines to clean up additional space Stretch The telescopic project fills the entire container, the default 6.flexFlex properties are similar to Box-flex in older versions to control scale allocations for scaling containers.Set up a scale assignment{ -ms-flex: 1;} { -ms-flex: 3;} { -ms-flex: 1;}7.flex-orderThe Flex-order property, like the Box-ordinal-group property, controls the order in which the scaling items appear.Set the order of scaling items{

array can be divided into two, respectively, the total XOR of the two dials, the result is the required two number.In addition, there are many ways to find a binary representation of 1 in a number, and the following two code provides two different methods.Idea oneWrite the code according to the ideas written above.Code class solution(object): def singlenumber(self, nums): "" : Type Nums:list[int]: rtype:list[int] "" "res = [0,0] tmp = reduce (Operator.xor, nums) mask = tmp (-tmp) fo

, http2.0 will be in this connection on the link multiplexing, that is, to allow a connection can also do parallel operation, so that the utilization of the connection is higher, if the http2.0 landing, the Web front end of those used to reduce the number of HTTP connections will lose the market, because the protocol itself can handle the problem of concurrency, as the external CSS Pieces, external javascript files, CSS Sprite technology is probably going to be history.It seems that this topic i

requirement for the C layer in MVC, the control layer. Front and back end separation topic there is a next chapter, I will also mention a front and back end separation scheme that is the use of Nodejs, and the use of Nodejs is closely related to the control layer, I mentioned in the previous Nodejs is the catalyst for the front-end separation solution, In fact, I personally think that the front-end separation scheme of Nodejs is a more perfect front-end separation scheme, one of the reasons for

Questions raised by sys. dm_ OS _waiting_tasks of SQL Server Applications (medium ), The previous article introduced the SQL Server application sys. dm_ OS _waiting_tasks raises a question (I) and says sys. dm_exec_requests and sys. dm_ OS _waiting_tasks has different results when obtaining parallel waits. In this article, we will talk about my second question: why is there so many waits for a parallel plan (4 threads, how to execute SQL in parallel !

Summary of Small and Medium-sized ORACLE production tools In daily production, data sources are often diverse. Let's talk about the amount of data in excel today, because many development languages now support exporting data to excel, however, some nonstandard practices may lead to the generation of unrecognized special characters? When special characters appear in the string, the actual audio is not great, but when special characters appear in the nu

variables are always stored in the stack memory of the method in which they reside, if:Base type: The value of the variable is stored directly in the variable's memory;Reference type: The address of the object or array in which the variable is actually referenced;The variables inside the stack do not need to be garbage collected by the system, and the variables of the stack memory end with the operation of the method or code block.4. Programming Specification DescriptionMethod names cannot use

This is a creation in Article, where the information may have evolved or changed. "Editor's note" Growingio is a new generation of data analysis products based on user behavior, providing the world's leading data acquisition and analysis technology. Businesses can acquire and analyze comprehensive, data-driven users and revenue growth without having to embed sites or apps. In order to cope with the rapidly changing business growth, we have adopted a micro-service architecture at the beginning of

Program4 {5 Static voidMain (string[] args)6 {7 //First: Use reflection8 varIlog =NewLoggermanager (typeof(program));9 Ten //The second kind: Write Dead OneIlog =NewLoggermanager (" Program"); A -Console.WriteLine (" World"); - } the } - - classLoggermanager - { + /// - ///the constructor records the class name + /// A /// at PublicLoggermanager (Type type) - { -

the development cycle is relatively short. The performance of network processors is greatly improved compared with other processors, but there is still a gap with ASIC in terms of high-speed data packet processing. In the vro field, vrouters that are at the core of a medium-sized enterprise network and at the edge of a telecom network use NP. However, there is still debate over whether the ASIC-based architecture is NP-oriented for the core routers u

Network virtualization-FlowVisor: Network Virtual Layer (medium) 1. Concepts understanding and review As mentioned in the previous blog, slice is defined as an instance of a virtual network, and a sliced stream can be considered as a sub-space of the whole geometric space consisting of headers of all possible data packets. For example, the stream table items in OpenFlow match certain fields. We can divide the entire geometric space according to diffe

information of the certificate4, prompt us to set up the corresponding firewall, start 443 port5, we will configure a copy, the same we select the corresponding guest system win2012r2-test03, and then click "Copy" into the Copy wizard, click "Next"6, specify the replica server, click "Next"7, here we also need to select the corresponding certificate, click "Select Certificate"8, select the corresponding certificate, click "OK"9, this time we can see the corresponding certificate details, click

Use Crystal Report (medium) in Visual Studio. NET) From www.aspfree.comTranslated by cash (World 7)Cashcao@msn.com (cashcao@msn.com) Crystal Report demo-Use Pull Model Follow these steps to use the Pull Model of Crystal Reports: (1) create a. rpt file and set the necessary database connection.(2) Place the CrystalReportViewer control on the. aspx page and set its attributes to point to the. rpt file we created.(3) Call the databind method in your code

C # socket communication (medium) on the. net platform ), In the previous article, C # socket communication (I) on the. net platform introduced the basic principles and the most basic communication methods of socket communication. On this basis, this article makes a simple summary of the issues frequently encountered during socket communication, all of which are some minor issues in the project, so it is easy to use next time, at the same time, I woul

operation functions Concat, length, substr, instr, trim, replace, lpad, rpad Tutorial 12: operate string functions Character operation functions: Case-sensitive operation functions Lower, upper, and initcap in upper case String operation functions Concat, length, substr, instr, trim, replace, lpad, rpad The purpose of this experiment is to master the functions of common string operations. String case-sensitive operations SQL> Select lower (ename), upper (ename), initcap (ename) from emp; SQL> S

, the installation path is/USR/LOCAL/NAGIOS/ETCMake Install-commandmode//To configure directory permissionsMake install-webconf//configure Nagios to integrate with Apache]nagios configuration file (you can see the file you want in the configuration file): #cat/etc/httpd/conf.d/nagios.conf Install the Nagios plugin:Tar zxvf nagios-plugins-1.4.14.tar.gzCD nagios-plugins-1.4.14./configure--prefix=/usr/local/nagios--with-nagios-user=nagios--with-nagios-group=nagiosMake make installNagios access Con