Sample Credit Card application eco-system

This branch contains the new stack demo. To see the same demo with Spring-Cloud-Netflix stack, check out the branch old-stack.

After running all the apps execute POST at localhost:9080/application passing cardApplication.json as body.

http POST localhost:9080/application < cardApplication.json

new card applications registered via card-service
user registered via user-service
fraud-service called by card-service and user-service to verify card applications and new users

If you want to run a bigger number of requests, you can use the ab benchmarking tool:

ab -p cardApplication.json -T application/json -c 10 -n 20000 http://localhost:9080/application

http GET localhost:9083/ignored/test

http GET localhost:9083/ignored/test/allowed

ignored service with test endpoint returning 404 via Proxy and /test/allowed endpoint returning response from the service.

+-------+                         +-------------+       +-------------+          +-------+             +---------------+ +-----------------+ +-------+
| User  |                         | CardService |       | UserService |          | Proxy |             | FraudVerifier | | IgnoredService  | | PRoxy |
+-------+                         +-------------+       +-------------+          +-------+             +---------------+ +-----------------+ +-------+
    |                                    |                     |                     |                         |                  |              |
    | Register application               |                     |                     |                         |                  |              |
    |----------------------------------->|                     |                     |                         |                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    | Create new user     |                     |                         |                  |              |
    |                                    |------------------------------------------>|                         |                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     |     Create new user |                         |                  |              |
    |                                    |                     |<--------------------|                         |                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     | Verify new user     |                         |                  |              |
    |                                    |                     |-------------------->|                         |                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     |                     | Verify new user         |                  |              |
    |                                    |                     |                     |------------------------>|                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     |                     |           User verified |                  |              |
    |                                    |                     |                     |<------------------------|                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     |       User verified |                         |                  |              |
    |                                    |                     |<--------------------|                         |                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |        User created |                     |                         |                  |              |
    |                                    |<--------------------|                     |                         |                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     |                     |                         |                  | User created |
    |                                    |<------------------------------------------------------------------------------------------------------|
    |                                    |                     |                     |                         |                  |              |
    |                                    | Verify card application                   |                         |                  |              |
    |                                    |-------------------------------------------------------------------->|                  |              |
    |                                    |                     |                     |                         |                  |              |
    |                                    |                     |                     Card application verified |                  |              |
    |                                    |<--------------------------------------------------------------------|                  |              |
    |                                    |                     |                     |                         |                  |              |
    |        Card application registered |                     |                     |                         |                  |              |
    |<-----------------------------------|                     |                     |                         |                  |              |
    |                                    |                     |                     |                         |                  |              |

+-------+                         +-------+         +-----------------+
| User  |                         | Proxy |         | IgnoredService  |
+-------+                         +-------+         +-----------------+
    |                                 |                      |
    | IgnoredService/Test             |                      |
    |-------------------------------->|                      |
    |                                 |                      |
    |                             404 |                      |
    |<--------------------------------|                      |
    |                                 |                      |
    | IgnoredService/Test/Allowed     |                      |
    |-------------------------------->|                      |
    |                                 |                      |
    |                                 | Get allowed          |
    |                                 |--------------------->|
    |                                 |                      |
    |                         Allowed |                      |
    |<--------------------------------|                      |
    |                                 |                      |

Setup using new stack

Client side load-balancing using LoadBalancerClient

Ribbon used via @LoadBalanced WebClient
Ribbon configuration modified via @LoadBalancerClient

Apps communicating via Gateway:

Routes have to be explicitly defined
Possibility to configure routes either via properties or Java configuration
All headers passed by default
Routes matched using predicates, requests modified using filters

Spring Cloud Circuit Breaker + Resilience4J

Interactions defined using injected CircuitBreakerFactory via the create() method
HTTP call and fallback method defined
Circuit breaker configuration modified in Customizer<CircuitBreaker bean in a @Configuration class
Resilience4J used underneath

Micrometer + Prometheus