Logging with a Dynamic Proxy in Java

Centralizing Logging and Security for Cleaner, More Maintainable Code

A dynamic proxy is a tool in Java that lets you create an object at runtime which implements one or more interfaces. Instead of writing a class by hand that implements an interface, you can have the proxy do that work for you. This proxy intercepts all calls to the interface’s methods and can perform extra actions (like logging, security checks, etc.) before or after forwarding the call to the real implementation.

Key Points in Simple Terms:

• Interception: It catches every method call made on the proxy.
• Delegation: It then passes that call to a “real” object that does the actual work.
• Extra Behavior: It allows you to insert extra code before and/or after the real method call without changing the original class.

A Real-World Scenario

Imagine you work for an e-commerce company. You have many services handling business logic like processing orders, managing inventory, etc. Now, you also need to log every time a service method is called for audit purposes.

Without Dynamic Proxies:

1. Direct Logging:
   You could add logging code inside every method of every…