To fix the threading issue, you can use double checked locking. The method must return the previously created instance or call the constructor and return the instance. To achieve this, provide a static method which checks if the object is created. While doing this, you don’t really want to create the Singleton at startup since Singletons are used for objects which are expensive to create. To create a class with only one instance, make the constructor private and create a publicly accessible static reference of the object. To guarantee that a class has only one instance, you need to control how the object is created. The Singleton pattern is particularly useful for objects which need to be shared between different parts in your app and for resources that are expensive to create. Singleton is a design pattern which ensures that a class has only one instance and provides a global point of access to the object. Read on to find out the differences between implementing a Singleton in Java vs Kotlin, how you can create Singletons in Kotlin without using the static keyword (spoiler this is achieved by using the object keyword), and to find out what’s happening under the hood when you’re using object.įirst, let’s back up a bit and find out why we need a single instance of an object, aka Singleton. You can use a single keyword: object, to implement the Singleton pattern. Kotlin has a more elegant way to deal with this. Singletons help you to create a single instance of an object, which can be accessed and shared by other objects. The static keyword is also used to create Singletons, one of the most widely used design patterns. In Java, the static keyword is used to denote methods and properties that belong to an object, not to an instance of an object.
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