other specifics, but on abstraction.
In the player example above, we have found the dependency. Now we need to optimize the dependency according to the dependency inversion principle.
According to the following principles:
The player depends on mediafile, so that both the player and mediafile depend on an abstract imediafile.
Operationmain depends on the player. It is easy to implement. operationmain and player both depend on an abstract iPlayer.
, abstract should not be dependent on other specific, should rely on abstraction.In the example above, we have found the dependency, and now we are going to optimize it according to the dependency inversion principle.Change according to the following principles:
The player relies on mediafile, so that both player and MediaFile rely on an abstraction imediafile
Operationmain relies on the player to make Operationmain and player dependent on an abstract
(callback) {Return callback ("Hola");}}Console.log (Yetother.method (One.say)); "Hola,"What is the meaning of God's horse, that is this.name is undefined, When the One.say assignment to say is, in fact, say stores a pointer to a function object, say the variable is clearly a property of the global variable, then the actual context becomes windows when it runs, and of course the name becomes undefined at th
apply.
var one = {
name: "Object",
say:function (greet) {return
greet + ', ' + this.name;
}
}
var tow = {
Name: "Two"
}
One.say.call (tow, "HI"); Hi, two.
This is borrowed, OK, class.
Well, well, actually there's something else to look at. You can use a method that is not "with a table" to assign value to someone and then continue with something that hasn't happened. So we usually use the borrowed time to pay attention to the cont
method.In general, you should not let each variable use the same variable name within the script.4. Namespace DictionariesThe namespace of the module is actually implemented in the form of a dictionary and can be shown by the built-in property __dict__. The same is true for class and instance objects: attribute point number operationsThe interior of the dictionary is the index operation, and attribute inheritance is actually a dictionary of search links. In fact, instances and class objects are
" }; User.whatIsYourName.call (User2);//output "Neha Sampat" The apply method is similar to the call method. The only difference between the two is that theapply method uses an array to specify the parameters, and each parameter of the call method needs to be specified individually:
Apply (Thisarg, [Argsarray])
Call (Thisarg, arg1, arg2, ...)
var user = {greet: "hello!", GreetUser: function (userName) { Console.log (this.greet + "" + userName); } };var greet1 = {greet: "
The dependency between objects is sometimes introduced through attributes. You can also use IOC'sProperty (setter) InjectionMethod.
When to use property (setter) Injection
The dependent objects can also be automatically instantiated when the parent object is instantiated.It is easy to achieveCodeView the items that each class depends onThe parent object has many constructor related to each other, which makes debugging and maintenance inconvenient.The parent object contains many parameter c
Statement: This series of blog reference "Big Talk design mode", author Geoscience.
The adapter mode (sometimes referred to as a wrapper style or wrapper) fits the interface of a class into what the user expects (the core problem that the adapter pattern solves). An adaptation allows classes that are usually not working together because of incompatible interfaces, by wrapping the class's own interface in an existing class.
Class Diagram:
Foreignplayer role: The interface rules within t
principle of the following changes: The player relies on mediafile, good to do, so that both the player and MediaFile to rely on an abstract imediafile Operationmain rely on the player, good to do, Let both Operationmain and the player rely on an abstract iplayer Operationmain rely on MediaFile, so that both Operationmain and MediaFile rely on an abstraction imediafile iplayer can not rely on specific medi
maps entry does need to contain localized text that portion'll be represented as an embedded Variable and the ultimate value of that variable'll be retrieved from a locale-specific App Map that's opened in Addit Ion to the shared App Map.Example:fmstudio_nls_en (known as FMSTUDIO_NLS):---------------------------------------- [applicationconstants]nlshello= "Hello!" Fmstudio_nls_es (known as FMSTUDIO_NLS):---------------------------------------- [applicationconstants]nlshello= "¡
command: Install ("Yourpath/rpython"), and the quotation marks are the location where you unzipped the Rpython. At this point, Rpython was successfully installed. If the installation process error, such as my error, unable to download Rjsonio, please install the corresponding missing library.After the installation is successful, let's take a look at how to use Rpython.In fact, the use of Rpython is relatively simple, it provides a number of call interface functions. Look directly at the code ex
PHP design mode-adapter Mode
The adapter mode (sometimes called the packaging style or packaging) adapts the interface of a class to what the user expects (the core issue to be solved by the adapter mode ). An adaptation allows a class that cannot work together because the interface is not compatible, by encapsulating its own interface in an existing class.
Class diagram:
ForeignPlayer role: the interface rules of this role are inconsistent, but the method function of this role must be calle
on MSDN, the interface contains only the signature of the method, delegate, or event. The more popular explanation for this sentence is that the interface is only responsible for completing the defined operation without implementing specific details. As the following iplayer interface, it is a game interface, which only defines the corresponding method, without the specific implementation of the method, the code is as follows:
1/**//// 2/// 玩游戏接口 3
, it may appear that the GC will be recycled when it is not strongly referenced elsewhere.
Let's look at an interface and a class first, and use the following
public interface IPlayer{ void Play ();}public class Mp3player:iplayer{ public void Play () { Console.WriteLine ("Playing Mp3"); }}
Next, you will introduce the Lifetime Manager scenario by specifying the appropriate lifetime manager at Registertype and RegisterInstance.
Unity Application Block (Unity) is a lightweight, scalable, dependency injection container developed by the Microsoft Patterns practices team to help build loosely coupled systems. It supports constructed child injection (constructor injection), attribute/Set Value method injection (Property/setter injection), and method invocation injection (methods call injection). The Patterns practices team released the first official version of Unity (Unity 1.0) a few days ago (April 4).
Preparatory work
context Manager
By default, the built-in file type of Python supports the context management protocol.Using the context manager with simplifies the process.
with open("log.txt", "w") as logger: logger.write('Hello ') logger.write('World')print logger.closed
2. Implement the context manager in two ways.Method 1: implement the _ enter _ and _ exit _ methods of the class. Method 2: contextlib module decorator and generator implementation.
The following two methods are used to implement a custom
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