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🔔 Subscribe to Ram N JavaIntroduction to the Proxy Design Pattern
The Proxy Design Pattern is one of the most widely used structural design patterns in object-oriented programming. At its core, a proxy acts as a surrogate or placeholder for another object to control, regulate, or augment access to it.
Why Do We Need a Proxy?
Directly interacting with an object isn't always ideal. There are scenarios where the target object is expensive to instantiate, requires security verification, resides on a remote server, or needs caching. A proxy provides the identical interface to the client while seamlessly managing these concerns behind the scenes.
Core Types of Proxies
- Remote Proxy: Acts as a local ambassador for an object living in another address space or remote server.
- Virtual Proxy: Delays the instantiation of memory-heavy objects until they are explicitly needed (lazy initialization).
- Protection Proxy: Evaluates permissions and user privileges before allowing access to sensitive operations.
- Smart Reference / Caching Proxy: Adds housekeeping tasks such as caching recent responses, counting reference counts, or managing locks.
Fundamental Advantages
- Transparent Interception: Clients interact with the proxy exactly as they would with the target service.
- Performance Optimization: Prevents unnecessary resource consumption through deferred loading and caching.
- Single Responsibility Principle: Keeps cross-cutting concerns (security, network calls, logging) separate from core business logic.
Recommended Related Tutorials
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| Proxy Design pattern - Introduction |
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