Add skeletton to save traces.

backend/codiki-exposition/src/main/java/org/codiki/exposition/configuration/TrafficTraceConfiguration.java

@@ -0,0 +1,12 @@
+package org.codiki.exposition.configuration;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.EnableAspectJAutoProxy;
+import org.springframework.scheduling.annotation.EnableAsync;
+
+@Configuration
+@EnableAspectJAutoProxy
+@EnableAsync
+public class TrafficTraceConfiguration {
+
+}

backend/codiki-exposition/src/main/java/org/codiki/exposition/traffic/ApiCallsLoggerAspect.java

@@ -0,0 +1,60 @@
+package org.codiki.exposition.traffic;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.codiki.application.traffic.TrafficTraceUseCases;
+import org.codiki.domain.traffic.model.HttpMethod;
+import org.codiki.domain.traffic.model.TrafficEndpoint;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+
+import java.util.Optional;
+
+@Component
+@Aspect
+public class ApiCallsLoggerAspect {
+    private static final String HTTP_HEADER_CORRELATION_ID = "x-correlation-id";
+
+    private final TrafficTraceUseCases trafficTraceUseCases;
+
+    public ApiCallsLoggerAspect(TrafficTraceUseCases trafficTraceUseCases) {
+        this.trafficTraceUseCases = trafficTraceUseCases;
+    }
+
+    @Before("@annotation(org.springframework.web.bind.annotation.GetMapping)")
+    public void logGetApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+
+    @Before("@annotation(org.springframework.web.bind.annotation.PostMapping)")
+    public void logPostApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+    @Before("@annotation(org.springframework.web.bind.annotation.PutMapping)")
+    public void logPutApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+    @Before("@annotation(org.springframework.web.bind.annotation.DeleteMapping)")
+    public void logDeleteApiCall(JoinPoint joinPoint) {
+       logApiCall();
+    }
+
+    private void logApiCall() {
+        Optional.ofNullable(RequestContextHolder.getRequestAttributes())
+                .filter(ServletRequestAttributes.class::isInstance)
+                .map(ServletRequestAttributes.class::cast)
+                .map(ServletRequestAttributes::getRequest)
+                .ifPresent(request ->
+                        Optional.of(request.getMethod())
+                            .flatMap(HttpMethod::fromString)
+                            .ifPresent(queryHttpMethod -> {
+                                String queryUriPath = request.getRequestURI();
+                                String correlationId = request.getHeader(HTTP_HEADER_CORRELATION_ID);
+                                TrafficEndpoint endpoint = new TrafficEndpoint(queryHttpMethod, queryUriPath);
+                                trafficTraceUseCases.saveNewTrace(endpoint, correlationId);
+                            })
+                );
+    }
+}