ruby singleton

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Detailed description of the Application of Singleton mode in Ruby Design Mode Programming, and ruby Design Mode

Detailed description of the Application of Singleton mode in Ruby Design Mode Programming, and ruby Design Mode IntroductionSingleton mode is one of the simplest forms of design patterns. This mode aims to make an object of A Class A unique instance in the system. To achieve this, you can start by instantiating the client. Therefore, we need to use a mechanism th

Analysis of Ruby design patterns-singleton)

Reprinted please indicate the source: http://blog.csdn.net/guolin_blog/article/details/8868758 This is a copy version of Java Design Pattern dialysis, which is specially provided for Ruby lovers. If you are not familiar with Ruby syntax, please refer: Java Design Pattern Analysis-singleton) When writing software, you often need to use the log printing function,

Ruby design mode Dialysis: Single case (Singleton)

def self.instance @ @instance = New unless @ @instance end First use Private_class_method to privatize the logger new method, so that you cannot create an instance of logger by using the new method. It then uses a static variable @ @instance to save the instance and provides a public instance method for obtaining an instance of the logger, in which it is judged that if the @ @instance is nil, a new logger instance is created, otherwise return directly to @ @instan

[Ruby] How to create Singleton class?

Singleton is a design pattern in the software engineering. Ruby has it own special feature to declare Singleton class. I'll demonstrate II examples as below:Class Logger def initialize @log = File.Open ("Log.txt", "a") end @ @instance = logger.new def Self.instance return @ @instance end def log (msg) @log. puts (msg) end Private_class_ Met

[Ruby] How to Create Singleton class?

Singleton is one design pattern in the software engineering. Ruby has its own special feature to declare Singleton class. I will demonstrate two examples as below:Class logger def initialize @ log = file. open ("log.txt", "A") end @ instance = logger. new def self. instance return @ instance end def log (MSG) @ log. puts (MSG) end private_class_method: newend log

Ruby study notes (8)-"four static methods" and "two Singleton methods"

# Class test def test. staticmethod1 puts "test. staticmethod1 "End def self. staticmethod2 puts "test. staticmethod2 "end class   # Class test def Method1 puts "Method1" endendt1 = test. newdef t1.singlemethod1 puts "t1.singlemethod1" endclass

Demonstrate Ruby's six characteristics that are easy to be misunderstood with actual code. The Code demonstrates ruby misunderstanding.

Demonstrate Ruby's six characteristics that are easy to be misunderstood with actual code. The Code demonstrates ruby misunderstanding. Introduction: if you are a C ++ developer, you need to use Ruby to quickly execute some prototype designs. When you pick up a Ruby reference book (such as Pickaxe) or browse a Ruby web

Method Search in ruby

end 6 7 module N 8 def method 9 puts "this is method in module N"10 end11 end12 13 class C14 include M15 include N16 end17 18 C.new.method19 p C.ancestors Output result This is method in Module N[C, N, M, object, kernel, basicobject] Class C contains two modules, m, n, m, and N, which have the method. So which one to call? If the method defined in ruby is in the same class, it overwrites the old method. Similarly, if Modul

Getting Started with Ruby (scripting language for object-oriented programming)

used directly from a ruby script. featuresCompletely object-oriented, in the Ruby language, no matter what is the object, contains the basic data types in other languages, for example, the integer variable has no type, ruby variables can be saved regardless of the type of data. No matter what has a value, whether it is a numeric or logical expression or a stat

Ruby and Metaprogramming are objects of all things _ruby topics

;> 1.instance_variable_get (: @my_var) => "World" Behavioral behavior is the action on the object, is the way we often say. The invocation of a Ruby method, similar to Smalltalk or OBJECTIV-C, takes message mode. Calling a method is equivalent to sending a message to this object. So a call to a method can do the same: In Ruby, the state, which is the instance variable, is stored in the object, a

Getting Started with Ruby (scripting language for object-oriented programming)

your Ruby script. featuresFully object-oriented, in the Ruby language, anything is an object, including basic data types in other languages, such as integer variables without types, and ruby variables can hold any type of data. Everything has a value, whether it's a number or a logical expression or a statement. The Ruby

One of Ruby's magical learning notes _ruby topics

(/(.) (.) /) {$1.upcase + $} End def upcase! gsub! (/(.) (.) /) {$1.upcase + $} End End Puts B.upcase # GoOdBye Puts B # goodbye b.upcase! Puts B # GoOdBye This class is called Singleton class, because this class is for the object of B. and design pattern Singleton object is similar, only occurs once of Dongdong we call Singleton.

Scala Learning (1)

unit type is similar to Java's void type. In fact, every method in Java that returns void is mapped to the method that returns unit in Scala.. Therefore, the result type is unit and only runs for their side effects. In the GREET () example, the side effect is to print a polite word on the standard output. Next, you will put scala code in a file and execute it as a script. If you want to leave the interpreter, enter quit or Q. Scala>: Quit $ Iv. Function text var i = 0while (i Note that the boo

Detailed descriptions of hook methods in Ruby

Detailed descriptions of hook methods in Ruby This article mainly introduces the detailed explanation of the hook method in Ruby. This article explains what is the hook method, extended, extended, prepended, inherited, and so on in included, Devise, for more information, see Ruby's philosophy is based on a basic element, that is, to make programmers happy. Ruby p

Detailed descriptions of hook methods in Ruby and Ruby hook Methods

singleton methods ). Let's look at another example:Copy codeThe Code is as follows:# We are using same Person module and User class from previous example. U1 = User. newU2 = User. new U1.extend Person Puts u1.name # => My name is PersonPuts u2.name #=> undefined method 'name' for # We created two User instance objects and called the extend Method on u1. With this call method, the name method of Person is only valid for u1 and is invalid for other ins

The hook method in Ruby _ruby topics

Ruby's philosophy is based on a basic element that makes programmers happy. Ruby is very focused on the happiness of programmers and offers a number of different ways to implement it. Its metaprogramming capabilities enable programmers to write code that is generated dynamically at run time. Its threading capabilities allow programmers to have an elegant way of writing multithreaded code. Its hook method allows programmers to extend the behavior of a

Write a single case in--python

Original addressOriginal Address 2Several implementations of the singleton pattern in Python and its optimizationReading directory (content)Single-Case modeSeveral ways to implement a singleton pattern1. Using the module2. Using adorners3. Using the class4. Based on the __new__ method (recommended and convenient for use)5. Implementation based on Metaclass modeRelated knowledgeImplementing a

Use RVM to manage Ruby and gem and rvmruby in Unix

Use RVM to manage Ruby and gem and rvmruby in Unix Reprinted: http://www.ibm.com/developerworks/cn/aix/library/au-aix-manage-ruby/ Although Internet Relay Chat, forums, and version control tools (such as Git and Github) Make distributed development very simple, it is very difficult to reconstruct the environment of another developer. To support existing code bodies on a new development machine, you must ma

Singleton design model-modern c ++ design-generic programming and design model study notes.

1.1 Singleton (Single Instance) If we think that a class only needs to generate one instance, we will design it as Singleton (single instance mode ). Singleton is the most frequently used mode in our projects,This mode ensures that a class has only one instance and provides a global access point to it.. Singleton is a

Java single case pattern profiling (involving synchronization, junit,log4j, reflection, class loader, multithreading, serialization)

Summary The single case pattern is one of the simplest design patterns, but for Java developers, it has many drawbacks. In this month's column, David Geary explores the single case pattern and how to deal with these flaws in the face of Multithreading (multithreading), Class loaders (Classloaders), and serialization (serialization). A singleton pattern is suitable for situations where a class has only one instance, such as a window manager, a print

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