ruby singleton

Explain the methods in Ruby and the Ruby Methods The Ruby method is very similar to the functions in other programming languages. The Ruby method is used to bind one or more repeated statements in a unit. The method name should start with a lowercase letter. If the name of a method starts with an uppercase letter,

The singleton pattern means that there is only one instance. The singleton pattern ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class.1. Key points of the singleton mode:　　It is obvious that there are three main

Reprint Please specify Source: http://blog.csdn.net/l1028386804/article/details/45441169OneOverviewEnsure that a class has only one instance and provides a global access point to access it.TwoApplicability1. When a class can have only one instance and the customer can access it from a well-known access point.2. When this unique instance should be extensible by subclasses, and the customer should be able to use an extended instance without changing the code.ThreeparticipantsSingleton defines a in

Ruby Learning tips for building a ruby environment under Linux1. Preface2.Linux Installing the ruby EnvironmentFirst, prefaceThis blog post records the construction of the Ruby programming environment under Linux.This article is based on the following articles:Http://www.cnblogs.com/xfiver/archive/2012/03/08/2385833.ht

Transferred from: http://www.cnblogs.com/lyanet/archive/2013/01/11/2856468.htmlThe singleton pattern means that there is only one instance. The singleton pattern ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class.1. Key points of the

conditions of Use: You can use this mode when you only need a unique object for a class in your system .Why is this pattern used? : Because sometimes the creation of some objects requires a lot of resources, using a single (unique) object instance to maintain some shared data, and so on, in these scenarios can be designed in a single-case mode, it is appropriate to reduce the memory overhead, because the unique object is not (limited) to create frequently.The first type: full-han modepublic clas

Singleton mode: Ensure that there is only one instance per class and provide a global access point to access this unique instance. (Logging,driver objects)Implementation: (1) Private constructors restrict the instantiation of other classes(2) private static pointer to itself member variable, class unique instance(3) public static method that provides a global access point to access this unique instanceA. A hungry man type

The singleton pattern means that there is only one instance. The singleton pattern ensures that a class has only one instance, and instantiates itself and provides this instance to the system as a whole. This class is called a singleton class.1. Key points of the singleton mode:　　It is obvious that there are three main

The founder of Ruby talked about the ruby blocks and closure structure at on. I want to repost on Qiu Haifeng's translation network (0) font size: T | T This conversation is translated from the third part of the interview with Matz on the artima.com website to help you understand the blocks and closure structures in ruby. AD: This interview is an interview with

Analysis of Ruby relay and message-related knowledge, analysis of ruby Inheritance allows you to create a class as the refinement and specialization of another class ). For example, in our automatic karaoke system, the concept of "Song" is encapsulated in the Song category. Then, as the market grows, we need to provide karaoke support. A karaoke song is no different from other songs (it just does not have a

. Ruby can be very easy to connect to DB2, MySQL, Oracle, and Sybase. Ruby has a rich built-in function that can be used directly from a ruby script. features Completely object-oriented, in the Ruby language, no matter what is the object, contains the basic data types in other languages, f

This article address: http://www.cnblogs.com/archimedes/p/java-singleton-pattern.html, reprint please indicate source address. Single-Case mode Ensure that a class has only one instance and provides a global access point to access it. OverviewThe singleton pattern is a mature pattern of how to design a class that has only one instance of the class, the key of which is to set the class's co

Objects generated by spring are Singleton by default. The scope attribute can be changed to multiple instances. Now there is another situation. The user class calls a service, which calls another tool. Sometimes we want users to be multi-sample, services to be single-sample, and tools to be multi-sample. The idea is to write configuration files. However, this writing method is incorrect! Automatic injection of spring cannot be used! Because the s

Sealed class singleton{ private Singleton (); Public Static ReadOnly Singleton instance=New Singleton ();}The Singleton class is declared as sealed, which guarantees that it will not be inherited, followed by the instance method, which turns the original _instance me

The singleton mode has the following characteristics: A singleton class can have only one instance A singleton class must create its own unique instance The Singleton class must provide this instance to all other objects A hungry man singleton mode: Because the

Project Address: Ruby-prof In the previous Profiling tool in Ruby, we listed several of the most commonly used profilers, but just a brief introduction, this time detailing how ruby-prof is used. Ruby-prof is a powerful, support CPU, memory use, object allocation and so on performance analysis, and provides a lot of fr

Ruby syntax notes, ruby syntax Accept user input first_name = gets.chomp Uppercase letters first_name.capitalize! Uppercase letters first_name.upcase! Lower letters first_name.downcase! Multi-row output Print Note # I am a comment Variable acquisition #{first_name} Variable Global variable $ Class variable @@ Method variable @ Local variables are lowercase letters or _ If/else if a Class class

Basic instructions for using regular expressions in Ruby, ruby Regular Expressions Built-in support for regular expressions is usually limited to scripting languages such as Ruby, Perl, and awk. This is a shame: although regular expressions are mysterious, they are a powerful text processing tool. It is quite different to support it through built-in instead of li

A summary of variable learning in Ruby and a summary of Ruby variable learning Variables in Ruby are in several forms, including local variables, instance variables, class variables, and global variables. For Beginners, they are often easy to mix up, especially java-like, it is still a headache to understand. After careful identification and learning, we will sum

This article describes how to implement singleton () singleton mode in php, and describes the implementation process of singleton () singleton mode in the form of instances, for more information about how to implement singleton () single