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Implementation double-checked locking on Singleton class:

Deepika Sahu answered on December 25, 2022 Popularity 3/10 Helpfulness 1/10

answer Implementation double-checked locking on Singleton class:

related What is double checked locking in Singleton?

Implementation double-checked locking on Singleton class:

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// Java Program to write double checked locking 
// of Singleton class
  
class Singleton {
    private volatile static Singleton instance;
  
    private Singleton() {}
  
    // 1st version: creates multiple instances if two thread
    // access this method simultaneously
    public static Singleton getInstance1()
    {
        if (instance == null) {
            instance = new Singleton();
        }
  
        return instance;
    }
  
    // 2nd version : this is thread-safe and only
    // creates one instance of Singleton on concurrent
    // environment but it is unnecessarily expensive due to
    // cost of synchronization at every call.
    public static synchronized Singleton getInstance2()
    {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }
  
    // 3rd version : An implementation of double checked
    // locking of Singleton. Intention is to reduce cost
    // of synchronization and improve performance, by only
    // locking critical section of code, the code which
    // creates instance of Singleton class.
    public static Singleton getInstance3()
    {
        if (instance == null) {
            synchronized (Singleton.class)
            {
                if (instance == null) {
                    instance = new Singleton();
                }
            }
        }
        return instance;
    }
}

Popularity 3/10 Helpfulness 1/10 Language java

Source: www.geeksforgeeks.org

Tags: implementation java locking singleton

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Contributed on Dec 25 2022

Deepika Sahu

0 Answers Avg Quality 2/10

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What is double checked locking in Singleton?

Comment

ouble checked locking is a technique to prevent creating another instance of Singleton when call to getInstance() method is made in multi-threading environment. 
In Double checked locking pattern as shown in below example, singleton instance is checked two times before initialization

Read more: https://javarevisited.blogspot.com/2011/03/10-interview-questions-on-singleton.html#ixzz7oRERmqvA

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Source: Grepper

Tags: double-checked-locking whatever

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Contributed on Dec 25 2022

Deepika Sahu

0 Answers Avg Quality 2/10

Implementation double-checked locking on Singleton class:

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