Lazy Construction of a Component

spring boot lazy initialization
lazy with @autowired
lazy initialized bean
spring lazy proxy
spring test lazy loading
difference between lazy loading and eager loading in spring
spring lazy initialization xml
spring bean eager

I want to create an Object with this requirement :

  1. The Object should be unique, one instance
  2. The Object components (fields) will be initialised in different parts of my code, not just in one place.

How can I Implement this ? Using Singleton or Builder or another design pattern.

Thanks

If you want to use single object throughout, use Singleton pattern,

If you want to initialize fields from different part from your code, use setter methods for that field.

For the point 1, i would suggest you to go with Singleton pattern.

A Quick Guide to the Spring @Lazy Annotation, Before going ahead, check out these guides for @Autowired and @Component annotations. Here, in order to initialize a lazy bean, we reference  Lazy initialization of an object means that its creation is deferred until it is first used. (For this topic, the terms lazy initialization and lazy instantiation are synonymous.) Lazy initialization is primarily used to improve performance, avoid wasteful computation, and reduce program memory requirements.

You could use a Singleton. Use an enum to represent a Singleton. For mutable fields, the access to read and write should be synchronised. Or you could look into AtomicReference, or other atomic implementation from java.util.concurrent package.

For example:-

enum Singleton{

    INSTANCE("Value");

    private final String value;
    private String otherValue;

    Singleton(String val){
       value = val;
    }

    public void doSomething(){
        //actions
    }

    public synchronized void setOtherValue(String value){
        this.otherValue = value;
    }

    public synchronized String getOtherValue(){
         return otherValue;
    }
}

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For single object creation you can restrict your class to make more than one object by create private constructor Example:

class Test 
{ 

    private static Test single_instance = null; 

    public String s; 

    private Test() 
    { 
        s = "example"; 
    } 

    public static Test getInstance() 
    { 
        if (single_instance == null) 
            single_instance = new Test(); 

        return single_instance; 
    } 
} 

How Kotlin's delegated properties and lazy-initialization work, The Android component code using Kotlin could probably be written as: class MainActivity : AppCompatActivity() { private var helloMessage : String = "Hello" }  Pass parameters to constructor, when initializing a lazy instance. Ask Question Asked 9 years, 5 months ago. Active 8 years, 7 months ago. Viewed 21k times

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Comments
  • I'll edit my ans if you're confused at some point. Just let me know.
  • Access to setter and getter of mutable singleton fields need synchronisation as well.
  • Above code is not a safe singleton. If 2 or more threads executed at the if statement check, possibly 2 or more Test instances created.