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The GoF Design Patterns Reference presents the up-to-date version of the standard GoF design patterns in a compact and memory friendly way so that they can. The authors of the DesignPatternsBook came to be known as the "Gang of Four." The name of the book ("Design Patterns: Elements of Reusable. Capturing a wealth of experience about the design of object-oriented software, four top-notch designers present a catalog of simple and succinct solutions to.

In addition to co-authoring Design Patterns: He and the other co-authors of Design Patterns are recipients of the Dr. Dobb's Journal Excellence in Programming Award. Design Patterns: Elements of Reusable Object-Oriented Software. Creational Patterns. Designing a Document Editor.

Structural Patterns. These design patterns book is suitable for any developer, whether beginners or experienced. Whether working in Java or some other technologies, these design patterns book will help you in learning design patterns in depth. What problems design patterns solve and how to implement them in a particular scenario.

This design pattern book starts with the introduction to Design Patterns, why do we need it and how to select a design pattern for a particular case.

Note that these design patterns examples are not in Java language but if you really want to learn the design pattern concepts, this is the book to read first, without any doubt.

I really love the simple real-life examples given in this book. This book covers all the design patterns with great explanation, what is the problem and how a design pattern solves them. This book explains design patterns to be used for Concurrency , Performance, Distributed Systems, Session Management, Data Source Patterns, Object-relational behavioral patterns, Object-relational structural patterns, Web Presentation Patterns and much more.

This is more than just a book for design patterns. What are the flaws in object creation patterns and how to fix them using different design patterns?

If you want to learn something by asking first WHY then this is the book for you. However, not all methods that return a new object are Factory methods. So, when do you know the Factory Method is at work? The rules are: the method creates a new object the method returns an abstract class or interface the abstract class or interface is implemented by several classes Factory Method in.

An example is the System. Convert class which exposes many static methods that, given an instance of a type, returns another new type.


For example, Convert. ToBoolean accepts a string and returns a boolean with value true or false depending on the string value true or false. Likewise the Parse method on many built-in value types Int32, Double, etc are examples of the same pattern.

Page 16 of 86 Design Pattern Framework 4. ToBoolean myString In. NET the Factory Method is typically implemented as a static method which creates an instance of a particular type determined at compile time.

A Hands-On Experience with Real-World Examples

In other words, these methods dont return base classes or interface types of which the true type is only known at runtime. This is exactly where Abstract Factory and Factory Method differ: Abstract Factory methods are virtual or abstract and return abstract classes or interfaces. Factory Methods are abstract and return class types. Two static factory method examples are File. Open and Activator. Page 17 of 86 7. Prototype Definition Specify the kind of objects to create using a prototypical instance, and create new objects by copying this prototype.

Page 18 of 86 Design Pattern Framework 4. Structural Real-world sample code The real-world code demonstrates the Prototype pattern in which new Color objects are created by copying pre-existing, user-defined Colors of the same type.

The abstract classes have been replaced by interfaces because the abstract classes contain no implementation code. RGB values range between , therefore the int has been replaced with a smaller byte data type.

The colors collection in the ColorManager class is implemented with a type-safe generic Dictionary class. In this implementation the key is of type string i.

ICloneable is a built-in. NET prototype interface.

See a Problem?

ICloneable requires that the class hierarchy be serializable. Here the Serializable attribute is used to do just that as an aside: if a class has 'event' members then these must be decorated with the NonSerialized attribute. Alternatively, reflection could have been used to query each member in the ICloneable class. Tip: always be concerned about poor performance when implementing cloning many objects through serialization or reflection.

Page 19 of 86 Code in project: DoFactory. NetOptimized Prototype: when and where use it Like other creational patterns Builder, Abstract Factory, and Factory Method , the Prototype design pattern hides object creation from the client.

5 Best Design Patterns Book to look for

However, instead of creating a non-initialized object, it returns a new object that is initialized with values it copied from a prototype - or sample - object. The Prototype design pattern is not commonly used in the construction of business applications.

The Prototype design pattern creates clones of pre-existing sample objects. The best way to implement this in. NET is to use the built-in ICloneable interface on the objects that are used as prototypes. The ICloneable interface has a method called Clone that returns an object that is a copy, or clone, of the original object.

When implementing the Clone functionality you need to be aware of the two different types of cloning: deep copy versus shallow copy.

Shallow copy is easier but only copies data fields in the object itself -- not the objects the prototype refers to.

.NET Design Patterns

Deep copy copies the prototype object and all the objects it refers to. Shallow copy is easy to implement because the Object base class has a MemberwiseClone method that returns a shallow copy of the object. The copy strategy for deep copy may be more complicated -- some objects are not readily copied such as Threads, Database connections, etc. You also need to watch out for circular references.

Prototype in the. NET support for the Prototype pattern can be found in object serialization scenarios. Lets say you have a prototypical object that has been serialized to persistent storage, such as, disk or a database.

Having this serialized representation as a prototype you can then use it to create copies of the original object.Visual Studio. The concept of inheritance is used to compose interfaces and define various ways to compose objects for obtaining new functionalities. Using Singleton you can hold one or more global variables and this can be really handy. Page 23 of 86 Design Pattern Framework 4. Your email address will not be published.

This book contains examples of scenarios in which different design patterns are used, together with a UML diagram and relevant code. The example below will need adjustment. Creational Patterns.

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