Is it possible to implement different patterns in the same application?

Yes, It's possible implement different architectural patterns within the same application, especially in complex systems with varied requirements.

Benefits of Combining Patterns

• Flexibility: Different parts of the application can use patterns that best suit their specific needs.
• Scalability: Combining patterns allows you to scale different components independently.
• Resilience: Using patterns like Circuit Breaker alongside microservices and event-driven architectures can improve the system's ability to handle failures.

How we can combine Event-driven pattern with microservices pattern?

Architecture Overview

• Microservices: These are small, independent services that each handle a specific business function.
• Evetn-Driven: This pattern involves services communicating with each other through events. When a service perform an action that other services might be interested in, it publishes an event to a message broker.

Component Diagram Representation

Example

By combining the Event-Driven pattern with the Microservices pattern, you can create a robust, scalable, and maintainable system that cna handle complex workflows efficiently.

Pros

1. Decoupling: Services are independent and only communicate through events. This decoupling makes the system more modular and easier to maintain.
2. Scalability: Each service can be scaled independently based on its specific load and requirements.
3. Resilience: If a service fails, events can be stored in the broker and processed later when the service is back online, improvising fault tolerance.
4. Flexibility: New services can be added or existing services can be modified without affecting other parts of the system.

Cons

1. Complexity: Managing an event-driven system with multiple microservices can be complex, specially in terms of monitoring and debugging.
2. Consistency: Event-driven systems often rely on eventual consistency rather than immediate consistency, which can complicate the logic for certain business operations.
3. Latency: Asynchronous communication can introduce latency in processing events, which may not be suitable for real-time applications.
4. Operational Overhead: Running and maintaining an event broker adds operational overhead and requires additional infrastructure.