# order-service -> inventory-service behind a Resilience4j circuit breaker (4-call window, 50% threshold, 5 s open)

--- healthy: circuit state, then one order ---
$ curl -X GET localhost:8080/api/orders/circuit
HTTP 200
{"state":"CLOSED","failedCalls":0,"notPermittedCalls":0}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":3,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"CONFIRMED"}

--- switch inventory-service to failing (POST /inventory/chaos?down=true), then place 4 orders ---
$ curl -X POST localhost:8080/api/inventory/chaos?down=true
HTTP 200
{"down":true}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":4,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"PENDING_INVENTORY"}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":5,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"PENDING_INVENTORY"}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":6,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"PENDING_INVENTORY"}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":7,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"PENDING_INVENTORY"}

$ curl -X GET localhost:8080/api/orders/circuit
HTTP 200
{"state":"OPEN","failedCalls":2,"notPermittedCalls":2}

--- circuit is OPEN: 2 more orders. inventory reserve calls before and after prove the calls were not even attempted ---
$ curl -X GET localhost:8080/api/inventory/stats
HTTP 200
{"reserveCalls":8}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":8,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"PENDING_INVENTORY"}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":9,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"PENDING_INVENTORY"}

$ curl -X GET localhost:8080/api/inventory/stats
HTTP 200
{"reserveCalls":8}

$ curl -X GET localhost:8080/api/orders/circuit
HTTP 200
{"state":"OPEN","failedCalls":2,"notPermittedCalls":4}

--- inventory-service recovers; wait 6 seconds (> the 5 s open window), then order again ---
$ curl -X POST localhost:8080/api/inventory/chaos?down=false
HTTP 200
{"down":false}

$ curl -X POST localhost:8080/api/orders -d '{"productId":1,"quantity":1}'
HTTP 201
{"id":10,"productId":1,"productName":"Mechanical keyboard","quantity":1,"total":89.90,"currency":"EUR","status":"CONFIRMED"}

$ curl -X GET localhost:8080/api/orders/circuit
HTTP 200
{"state":"CLOSED","failedCalls":0,"notPermittedCalls":0}