AltezzaSys AWS Architect Interview Questions and Answers

Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Used to restrict the instantiation of a class to one object

• Provides a global point of access to the instance

• Commonly used in logging, caching, thread pools, database connections

• Example: Database connection manager class with a single instance

Circuit Breaker is a design pattern used in microservices to prevent cascading failures.

• Circuit Breaker monitors the availability of a service and prevents requests from being sent if the service is unavailable.

• It helps in improving the resilience of the system by providing a fallback mechanism.

• When the Circuit Breaker is open, it redirects calls to a predefined fallback method or returns an error response.

• Once the ser...read more