![]() ![]() Even if, instead of implementing, the individual clients implement other client-specific methods with an UnsupportedOperationException, still its a colossal waste of time as well necessary exposure of methods and then their mandatory implementations. The problem with this design approach is that all clients will have to unnecessarily implement all other clients' methods just to make their interface compile. It contains methods specific to all the clients. The GrandInterface shown above is an ideal example of a fat interface. The GrandInterface has methods pertaining to Client 1’s required functionality are shown in a block named, Client 2 specific functionality in and so on. There are multiple clients - Client 1, Client 1.Client n. holding all the methods for all the clients, it is better to have multiple interfaces with each interface containing methods for a client-specific functionality or to have functionally cohesive interfaces. What the Interface Segregation Principle advocates is that instead of having a single interface catering to all the clients, i.e. To understand Interface Segregation's definition, let us assume that there is a system which has multiple functionalities and various clients using those functionalities via some interface such as a service or an API (Application Programming Interface). Many client specific interfaces are better than one general purpose interface Examining the definition of Interface Segregation Principle Martin has defined Interface Segregation Principle as. Next, an example of a fat interface is picked for a use case in Java, it is analysed and then refactored in line with the interface segregation principle to arrive at lean interfaces. It first looks at the definition of the interface segregation principle and explains its concepts. Let’s assume that the application should consider only those employees whose designation is part of category Technologies.This tutorial explains the Interface Segregation Principle with example in Java. Let’s build an application to calculate and display salaries of the different employees of an organization on the basis of category of designations as shown below: Description ![]() This enables the client to use different types of service provider objects in a seamless manner without requiring any changes even when a new service provider is designed as part of the class hierarchy. Using the Interface pattern, the common services offered by different service provider classes can be abstracted out in a separate interface.Įach of the service provider classes can be designed as implementers of this common interface.įrom the below figure we can see that objects of different service provider classes can be treated as objects of the interface type. Hence it requires changes to the design and implementation of the client and greatly reduces the re-usability of the client by other objects.įrom the above problem we can find in such cases, the Interface pattern can be used to design better implementation with different service provider classes that offer the same service to enable the client object to use different classes of service provider objects with little or no need for altering the client code. The client will not be able to make use of the different classes of service provider objects in a seamless manner because the client expects the service provider to be always of the same class type. The above approach works fine when there is only one type of objects from a class offering a given service, but may not be adequate when there are more than one type of objects from multiple classes that provide the same service required by the client as shown below. This type of direct interaction ties the client with a specific class type for a given service request. ![]() These objects provide services either on their own or by interacting with other objects.Īn object that requests a service from another object is referred to as a client object.įrom the below figure we can see the client object assumes that the service provider objects corresponding to a specific service request are always of the same class type and directly interacts with the service provider object. The functionality of an object-oriented system is encapsulated in the form of a set of objects. The interface pattern can be used to design a set of service provider classes that offer the same service so that a client object can use different classes of service provider objects in a seamless manner without having to alter the client implementation. In this tutorial we will show you what is Interface Pattern and when we consider this Interface Pattern to use in our application design.
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