Circuit Breaker Pattern Using Java Virtual Threads and Structured Concurrency

Demonstrates implementing the Circuit Breaker pattern using Java 21's virtual threads and structured concurrency features. The implementation includes a custom circuit breaker class with three states (closed, open, half-open) and uses StructuredTaskScope for managing concurrent tasks. The approach eliminates the need for external libraries like Resilience4j, providing a lightweight solution for handling transient failures in microservices architectures.