design strategy books

1. My description In software development, problems with common characteristics are abstracted and encapsulated into classes. In the actual environment, different implementation methods are selected as needed. For example, the supermarket charging system sometimes requires discounts for activities. They all share the characteristics of billing, but their implementation methods are different. This reduces the coupling between algorithms and makes the system scalable. I feel that there are many si

This article uses mall promotions as an example to implement this mode. Three types of mall activities: 1. Fees are charged based on the original price. 2. Off 3. Full-scale 300 anti-100 I. Factory model implementation II. Implementation of policy Modes Iii. Implementation of the factory + Strategy Model Package COM. WZS. design;/*** factory mode implementation ** @ author administrator **/public class si

implementation is packaged into a class, if there are many alternative strategies, then the number of these classes is very large.To recognize a policy pattern from a code perspective:(Zhao Yun with three tricks to solve the problem, there are three elements in this scene: Three ingenious tricks, one capsule, one Zhao Yun)1. First create a policy interface (contains an algorithm that can be executed by each of the tips)2. Then write three implementation classes, because there are three clever t

(intOpintLintR) { in intsum = Query (1,1, n,l,r); the //printf ("#%d:sum%d\n", op,sum); the if(OP) { AboutModify1,1, n,l,l+sum-1,1); theModify1,1, N,l+sum,r,0); the}Else{ theModify1,1, N,l,r-sum,0); +Modify1,1, n,r-sum+1R1); - } the }Bayi the BOOLCheck () { theBuild1,1, n); - //cout - for(inti =1; I ){ the SORT (Ask[i].op,ask[i]. L,ask[i]. R); the //printf ("#%d Now:", I); for (int j = 1;j the } the returnQuery1,1, N,QWQ); - } the the intMain () { thescanf"%d%d",n,m

The "sliding window" and the "equivalent conversion" described in the previous blog are also ideas for an algorithm optimization. Again, here's an example to introduce this idea.Unique Snowflake (unique Snowflake,uva 11572)Enter a sequence a of length n (nAfter reading the topic, we have no difficulty in thinking. The simplest idea is that we can find the longest sequence (without the same element) for each element by means of a loop. This method can also be made, but it seems to be a bit too tr

Policy Mode English name Strategy pattern definition The algorithm family is defined, packaged separately, so that they can be replaced by each other, and this pattern allows the algorithm to change independently of the customer using the algorithm. design principles to be addressed 1. Identify the changes that may be needed in your application, separate them, and don't confuse them with code that doesn

algorithms, is it necessary to understand the application of these three algorithms? Again for example, the client wants to use a container, has the link list realizes, also has the array realization, does the client also want to understand the link list and the group what difference? This is contrary to Dimitri law. Applicable ScenariosTo do object-oriented design, the policy model must be very familiar, because it is essentially object-oriented inh

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between the base class and the factory class. Now, Lucene/SOLR uses the factory model when processing word segmentation. At that time, we didn't know why these word segmentation classes ended with factory. It turned out to be an application of the factory model, here, the application of the design pattern in the framework is sufficient. 2. Rule Mode Strategy. h #include Context. h #include "strategy.h"cla

its own interface. When different behaviors are stacked in a class, it is difficult to avoid using conditional statements to choose the appropriate behavior.Encapsulating these behaviors in separate policy classes allows you to eliminate conditional statements in classes that use these behaviors.Policy patterns are used to encapsulate algorithms, as well as to encapsulate almost any type of rule, and you can consider using a policy pattern as long as you need to perform different operating mode

This series mainly records what the design pattern intends to be, what issues it wants to solve, and when it can be used; how it solves it, master its structure diagram, remember its key code; be able to think of at least two of its application instances, one in life and one in software; What are the advantages and disadvantages of this model, and what use scenarios are there, what should I pay attention to when using it. 13. Rule Mode Intention

, interested can be tested. The following summarizes the characteristics of the recursive algorithm:1. simple (clear structure, readable and strong)2. low performance (compared to iterations)Low performance due to the following two points:1 requires recursive call to work stack support (unavoidable)2 possible overlap of sub-problems (must be avoided)Here the main points of knowledge of recursion is finished, the following describes the article title of the Division of the law.The basic idea of d

functionality to all business classes) Trait logtrait{ Record the specific Log object Private $_log; Used by callers to set specific log objects Public Function Setlog (Loginterface $log) { $this->_log= $log; } Features used in the Business class This method can be defined as private if there is no external access. The implementation of this method can also be changed, and the data can be passed using the parameter method Public Function log () { $this->_log->log (

The strategy pattern (strategy pattern) embodies two fundamental principles of object-oriented design: The concept of package change, the use of interfaces in programming, and not the implementation of interfaces. The policy pattern is defined as follows: Define a set of algorithms that encapsulate each algorithm and make them interchangeable. The policy pattern

address of the cluster mode, as well as the various registry of the abstraction. Dubbo-monitor monitoring module, count the number of service calls, call time, call chain tracking service. Dubbo-config configuration module, is Dubbo External API, the user through config to use Dubbo, hide Dubbo all the details. The Dubbo-container container module, which is a standalone container, starts with a simple main load spring, because the service typically does not require the features o

movements during Operation. Let the duck class implement the interface, only let the duck have a behavior.So joe, thinking of using the combination of prevention, when the Ducks need other flight function requirements, we can use the Setbehavior () way, the specific way of flight. Code interface FlyBehavior{publicfunctionfly();}classFlyWithWings implementsFlyBehavior{publicfunctionfly(){echo"Fly With Wings \n";}}classFlyWithNo implementsFlyBehavior{publicfunctionfly(){echo"Fly With

).The general design of a UNIX system places information that is only useful to the current process (such as a file descriptor) in user space, which is generally called the U-zone. the most important reason to design the U zone is to save memory, and today's machines already have very ample memory, so there is no need to specifically put all the information that can be placed in the U area in the U area, I

InterfaceQuackbehavior { the Public voidQuack (); + } - // the classQuackImplementsQuackbehavior {Bayi Public voidQuack () { theSYSTEM.OUT.PRINTLN ("Quack"); the } - } - //won't call the classMutequackImplementsQuackbehavior { the Public voidQuack () { theSystem.out.println ("); the } - } the // the classSqueakImplementsQuackbehavior { the Public voidQuack () {94System.out.println ("Squeak"); the } the } the //Green-headed Duck98 classMallardduckextendsDuck { Abo

enterprise's IT staff can only discuss the problem in vague terms. However, it is important to try to quantify the proposed solution by how much it costs to purchase or implement the solution. For example, a high-end product with a full firewall could be worth 100,000 of dollars, while low-end products could be free; it could take months to build a high-end firewall from scratch. In addition, the system administration overhead is also a problem to consider. Building a home-grown firewall is goo

in other systems? 3. Skilled use of the idea of inheritance: to find the application of the same, and not easy to change things, to extract them into the abstract class, let the subclass to inherit them, the idea of inheritance, but also convenient to build their own logic on the results of others. such as ImageField extends JTextField; skilled use of the idea of the interface: Find out where the application may need to change, separate them out, do not mix with the code that does not need to c