executes, it will quickly loop through the packet and end with CTRL + C. Use the Inter option if you want to have a certain time interval between sending packets two times. sendp(Ether()/IP(dst= "www.baidu.com")/ICMP()/"XXX",iface="eth0",loop=1,inter=1)Indicates that a packet is sent every 1 seconds.2.3 Sending and receiving packets on level 2 and Level 3
Level 3
--SR (). Returns the reply and no reply packages.
--SR1 (). Returns only the packets that were replie
1. Spring-data-redis IntroductionEncapsulates the Redis client, making it easier to use.The advantage is that the client connection is placed in a connection pool to improve performance. There is also the ability to switch between different clients without changing one line of code (a technique that spring is accustomed to).The latest version of this writing is 1.3,Currently supports the following 4 types of Java clients, which are free to switch without changing the code.
Jedis
Jre
Single Responsibility Principle (SRP.Definition:There shoshould never be more than one reason for a class to change.There should be only one reason for the change.Sometimes, developers may have some problems when designing interfaces. For example, user attributes and user behaviors are declared in an interface. This causes the Business Objects and business logic to be put together. As a result, this interface has two responsibilities and the interface responsibilities are unclear, according to t
) dependent lead principle (DIP)High-level modules (stable) should not rely on the underlying modules (changes), both of which should be dependent on abstraction (stability).Abstraction (stability) should not depend on implementation details (change), implementation details should depend on abstraction (stability)Corresponds to the code example:The High-level module (mainform) should not be dependent on the underlying module (LINE,REC), both of which should be dependent on the abstract (Shape)Im
, the system structure with high cohesion and low coupling is designed, making the system more flexible and easy to expand, and the cost is low. Object-Oriented Design PrinciplesSingle SRP Responsibility PrincipleFor a class, there should be only one reason for its change. OCP open-closed PrincipleSoftware entities (classes, modules, functions, etc.) can be carried out, but cannot be modified. LSP Liskov replacement principleChild types must be
the service, unless they are already tied to the $scope. The service itself is singleton and exists throughout the application's lifecycle, but the controller is transient between the states of the application. If the data is stored in the controller, it needs to be retrieved from somewhere again when it is instantiated again. Even if you store the data in Localstorage, you get the same level of speed as you would from a JavaScript variable.ANGULARJS works well when it follows a single responsi
09 Summary of principles: # #单一职责原则 * responsibilities are defined as: Causes of change; * The SRP principle is embodied as: an object (method) only do one thing; # # #常用模式:* Proxy mode * Iterator mode * Singleton mode * Decorator Mode # # # # #分离职责 * If as demand changes, There are two responsibilities that always change at the same time, so there is no need to separate them; * The axis of responsibility changes only when they are determined to chang
readystate==4
MVC turns on client-side validation
Controllers: Block user input, reconcile models and views, and their communications
Models: Data attributes, data validation, business logic
Views: Rendering UI, binding model
Check input data before sending to another layer
Single Responsibility principle (SRP), open closure principle (OCP open for expansion, modification off), Richter replacement principle (LSP), interface isolation prin
assigned. Therefore, the abstraction layer is reflected between the upper layer and the base layer, so that the upper layer depends on an abstraction layer. In the abstraction layer, you can choose to add new minimum units and high-level dependency abstraction.
6. Five Principles:
Single Responsibility Principle SRP: Single Responsibility Principle
OCP: Open-Close Principle
Liskov replacement Principle LSP: Liskov Substitution Principle
Dependency in
This article introduces the content of the interview summary of PHP, has a certain reference value, now share to everyone, the need for friends can refer to
PHP has collected some common basic and advanced questions.Basic Article # # #-the difference between Get and POST-the difference between single and double quotation marks-the difference between isset and empty-the difference between echo, Print_r, print, Var_dump-What is MVC?-What is the difference between a pass and a reference?-the diffe
reference to the current class, depending on where the current method is defined. So, this is a good explanation of why the above code outputs a. But what if we need to output B? Can do this:
Late static binding This is to bypass the restriction by introducing a new keyword that represents the class that was originally called by the runtime. Simply put, this keyword allows you to invoke test () in the above example to refer to the class B instead of a. The final decision is not to introduce a
the traditional SQL type, or both. This article models the latter case. The example in Listing 2 connects to the "test" database and creates two tables. The first is the "items" table, which tracks the sales of goods and the customer's evaluation of goods. The second table traces the "customer" information, including the contact information. Note that "comments" and "contactinfo" are based on the new DB2 XML data type, and all other columns are based on the traditional SQL data type.
Listing 2.
GOF23 Type design patternDesign principles:1. Single responsibility Principle (SRP): In the case of a class, there should be only one cause for it to change2. Open-Close principle (OCP): Software entities (classes, modules, functions, etc.) should be extensible, but not modifiable. That is, the extension is open, and the modification is closed.3. Dependency reversal principle: a. High-level modules should not rely on low-layer modules, and two should
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