DEV Community

Sergey Leschev
Sergey Leschev

Posted on • Updated on

🍬 Virtual Proxy

Virtual Proxy


The proxy pattern is used to provide a surrogate or placeholder object, which references an underlying object. Virtual proxy is used for loading object on demand.

Github https://github.com/sergeyleschev/design-patterns

Example



protocol HEVSuitMedicalAid {
    func administerMorphine() -> String
}

final class HEVSuit: HEVSuitMedicalAid {
    func administerMorphine() -> String {
        return "Morphine administered."
    }
}

final class HEVSuitHumanInterface: HEVSuitMedicalAid {
    lazy private var physicalSuit: HEVSuit = HEVSuit()
    func administerMorphine() -> String {
        return physicalSuit.administerMorphine()
    }
}


Enter fullscreen mode Exit fullscreen mode

Usage



let humanInterface = HEVSuitHumanInterface()
humanInterface.administerMorphine()


Enter fullscreen mode Exit fullscreen mode

Sources: Github

Structural
In software engineering, structural design patterns are design patterns that ease the design by identifying a simple way to realize relationships between entities.
Source: wikipedia.org


🐝 Chain Of Responsibility
👫 Command Pattern
🎶 Interpreter Pattern
🍫 Iterator Pattern
💐 Mediator Pattern
💾 Memento Pattern
👓 Observer Pattern
🐉 State Pattern
💡 Strategy Pattern
📝 Template Method
🏃 Visitor Pattern
🌰 Abstract Factory
👷 Builder Pattern
🏭 Factory Method
🔂 Monostate Pattern
🃏 Prototype Pattern
💍 Singleton
🔌 Adapter Pattern
🌉 Bridge Pattern
🌿 Composite Pattern
🍧 Decorator Pattern
🎁 Facade Pattern
🍃 Flyweight Pattern
Protection Proxy
🍬 Virtual Proxy


Contacts
I have a clear focus on time-to-market and don't prioritize technical debt. And I took part in the Pre-Sale/RFX activity as a System Architect, assessment efforts for Mobile (iOS-Swift, Android-Kotlin), Frontend (React-TypeScript) and Backend (NodeJS-.NET-PHP-Kafka-SQL-NoSQL). And I also formed the work of Pre-Sale as a CTO from Opportunity to Proposal via knowledge transfer to Successful Delivery.

🛩️ #startups #management #cto #swift #typescript #database
📧 Email: sergey.leschev@gmail.com
👋 LinkedIn: https://linkedin.com/in/sergeyleschev/
👋 LeetCode: https://leetcode.com/sergeyleschev/
👋 Twitter: https://twitter.com/sergeyleschev
👋 Github: https://github.com/sergeyleschev
🌎 Website: https://sergeyleschev.github.io
🌎 Reddit: https://reddit.com/user/sergeyleschev
🌎 Quora: https://quora.com/sergey-leschev
🌎 Medium: https://medium.com/@sergeyleschev
🖨️ PDF Design Patterns: Download

Top comments (0)