Wrap A Command with Builder Pattern
Dec 19, 2018
This article shows a well-designed way to wrap a command and expose it through API with the classic Builder pattern. In this tutorial, you will learn how to write the Builder pattern, and how to direct standard output stream and standard error stream... Read more
Building an Efficient Cache
Sep 26, 2018
To build a cache could be as simple as to just to use a key-value pair kind data structure. It works sufficient most of the time in a single-threaded application. However, when there are many clients access the same cache while the computation being ... Read more
Behavioral Patterns - Visitor Pattern Exercise
Jul 17, 2018
The Visitor Pattern represents an operation to be performed on elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates. In this exercise, we will create a bookstore in... Read more
Behavioral Patterns - Template Method Pattern Exercise
Jul 11, 2018
The Template Method Pattern defines the skeleton of an algorithm in a method, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm’s structure. In this exercise, we ... Read more
Behavioral Patterns - Strategy Pattern Exercise
Jul 03, 2018
The Strategy Pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable. Strategy lets the algorithm vary independently from clients that use it. In this exercise, we will use the Strategy Pattern to create a simpli... Read more
Behavioral Patterns - State Pattern Exercise
Jun 26, 2018
The State Pattern allows an object to alter its behavior when its internal state changes. It tremendously reduces the complexity when introducing more states later to the object. In this exercise, we will use the State Pattern to create a modern vend... Read more
Behavioral Patterns - Observer Pattern Exercise
Jun 20, 2018
The Observer Pattern is widely used to solve one-to-many object state changes notification problems. The pub/sub model uses the Observer Pattern as the base pattern. It is also used in the event-driven systems. In this exercise, we will create a naiv... Read more
Behavioral Patterns - Memento Pattern Exercise
Jun 20, 2018
The Memento Pattern is used to record the internal state of an object. It is used to create a state machine and also makes undo or redo operation very easy with this pattern. In this exercise, we will use a scenario of account and account manager to ... Read more
Behavioral Patterns - Mediator Pattern Exercise
May 18, 2018
The Mediator Pattern defines an object that encapsulates how a set of objects interact. In this exercise, we will create a mediator that helps us handle the cross-cutting business logic in the Command Pattern Exercise.... Read more
Behavioral Patterns - Iterator Pattern Exercise
May 18, 2018
The iterator pattern is widely used in collections, it simplifies the way a collection could be iterated as well as provides a mutable capability to the collection during the iteration. Most languages provide an interface to the iterator pattern.... Read more