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Hands-On Design Patterns with Delphi

You're reading from   Hands-On Design Patterns with Delphi Build applications using idiomatic, extensible, and concurrent design patterns in Delphi

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Product type Paperback
Published in Feb 2019
Publisher Packt
ISBN-13 9781789343243
Length 476 pages
Edition 1st Edition
Languages
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Author (1):
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Primož Gabrijelčič Primož Gabrijelčič
Author Profile Icon Primož Gabrijelčič
Primož Gabrijelčič
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Toc

Table of Contents (19) Chapters Close

Preface 1. Section 1: Design Pattern Essentials FREE CHAPTER
2. Introduction to patterns 3. Section 2: Creational Patterns
4. Singleton, Dependency Injection, Lazy Initialization, and Object Pool 5. Factory Method, Abstract Factory, Prototype, and Builder 6. Section 3: Structural Patterns
7. Composite, Flyweight, Marker Interface, and Bridge 8. Adapter, Proxy, Decorator, and Facade 9. Section 4: Behavioral Patterns
10. Nullable Value, Template Method, Command, and State 11. Iterator, Visitor, Observer, and Memento 12. Section 5: Concurrency Patterns
13. Locking patterns 14. Thread pool, Messaging, Future and Pipeline 15. Section 6: Miscellaneous Patterns
16. Designing Delphi Programs 17. Other Kinds of Patterns 18. Other Books You May Enjoy

Proxy

A proxy is a component that wraps another component and exposes the wrapped interface. This definition doesn't make much sense. Why would anyone want to add another layer of indirection (another wrapper) and expose the same wrapped interface? They would do this simply because a proxy doesn't guarantee that each call of that interface will be forwarded to the wrapped object. It is entirely possible that the proxy will generate the result internally or execute something else (introduce a side effect) before or after calling the wrapped interface.

When you are accessing the web from inside a business environment, the traffic usually flows through a http filtering and caching proxy. This software catches all http requests generated in browsers and other applications and then decides whether it will forward a request to the target site, return the result from the cache...
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