Java Development Harnesses The Potential Of Flyweight Design Pattern

Flyweight is utilized when there is a requirement to develop a larger number of objects of the same nature

. Since a large number of objects tend to use more memory therefore flyweight design pattern offers an alternative through which the memory load is decreased through sharing of objects. Flyweight segregates the object properties into two different kinds where one is intrinsic and the other one is extrinsic.

When Outsource Java development should use Flyweight Design Pattern

* A number of factors need to be considered to exactly when the outsource Java development team should used flyweight design pattern and some of these parameters include:

* When Java development team finds a need for creating large number of objects

* When memory cost becomes a constraint due to the large number of objects

* When it is possible to make the different object attributes external and shared

* The application should not mandate unique objects since after the implementation some objects are used on a repeated basis

* When the extrinsic state can be computed instead of being stored

How Outsource Java Development team can apply flyweight?

It is important to analyze before creating the object in large number and making it undergo the flyweight process. The basic aim is to develop less number of objects through the reuse of the same objects. It is beneficial to develop smaller group of objects so that they can be reused through sharing. It is important to closely observe the object properties as they can be divided into intrinsic and extrinsic.

Intrinsic and Extrinsic State

It is important that Java developers create only 26 objects so that it is able to map every unique character. The character of the 26 objects will be the intrinsic state, which means that the object 'a' will possess state as character 'a'. The color, font and size will form the extrinsic state and will need to be passed by client code. Therefore 26 objects will be stored; the client code will get the required character and pass the extrinsic state to it in regard to this particular context.

How Java Development team can implement Flyweight?

When the object is in intrinsic state it is called flyweight object. When flyweight is implemented it creates concrete objects and also possesses the intrinsic state that is stored within it. To make the concrete objects outsource Java development team need to have factory, which will be called Flyweight factory? This factory is responsible for ensuring that the objects are shared and prevent duplication.

For example, different geometrical shapes such as rectangles and ovals have to be drawn in large numbers. Every shape can vary in size, color and font and the Java development team can ensure that every shape also features a label that directly maps it with a shape. This means that all the rectangles will be labeled as 'R' and all the ovals will be labeled as 'O'.

The flyweight will possess intrinsic state as label only and hence there will be only two flyweight objects. The other properties that tend to vary such as color, font and size will be regarded as extrinsic. The flyweight factory will control the two flyweight objects and ensure it distributed to clients accordingly. There will also exist an interface that would help outsource Java developers to implement so that there is also a common blueprint. The client code can utilize random number generators to develop extrinsic properties.

by: D N Talaviya

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