Does singleton allow lazy initialization?
When the singleton class is loaded, inner class is not loaded and hence doesn’t create object when loading the class. Inner class is created only when getInstance() method is called. So it may seem like eager initialization but it is lazy initialization.
Is singleton lazy loading?
Singleton Class in Java using Lazy Loading The instance could be initialized only when the Singleton Class is used for the first time. Doing so creates the instance of the Singleton class in the JVM Java Virtual Machine during the execution of the method, which gives access to the instance, for the first time.
What is the advantage of having a lazy loaded singleton?
Advantages of Singleton Design Pattern Can be lazy-loaded and has Static Initialization. It helps to hide dependencies. It provides a single point of access to a particular instance, so it is easy to maintain.
Why is lazy vs eager initialization preferred?
Lazy initialization is technique were we restrict the object creation until its created by application code. This saves the memory from redundant objects which some time may be very big/heavy. In other way eager initialization creates the object in advance and just after starting the application or module.
What are the disadvantages of applying GOF Singleton pattern?
They violate the single responsibility principle: by virtue of the fact that they control their own creation and lifecycle. They inherently cause code to be tightly coupled. This makes faking them out under test rather difficult in many cases. They carry state around for the lifetime of the application.
Which is better lazy loading or eager loading?
When we need more data related to the initial data, additional queries are issued to the database. If you are not sure of what data is exactly needed, start with Lazy Loading and if it is leading to N + 1 problem then Eager Loading handles the data better.
Are Springboot singleton thread safe?
Spring singleton beans are NOT thread-safe just because Spring instantiates them. Sorry. Spring just manage the life cycle of singleton bean and maintains single instance of object. Thread safety has nothing to do with it.