public void beforeMethod()

in apm-sniffer/apm-sdk-plugin/spring-plugins/mvc-annotation-commons/src/main/java/org/apache/skywalking/apm/plugin/spring/mvc/commons/interceptor/AbstractMethodInterceptor.java [94:199]
86 lines of code
21 McCabe index (conditional complexity)

    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
                             MethodInterceptResult result) throws Throwable {

        Boolean forwardRequestFlag = (Boolean) ContextManager.getRuntimeContext().get(FORWARD_REQUEST_FLAG);
        /**
         * Spring MVC plugin do nothing if current request is forward request.
         * Ref: https://github.com/apache/skywalking/pull/1325
         */
        if (forwardRequestFlag != null && forwardRequestFlag) {
            return;
        }

        Object request = ContextManager.getRuntimeContext().get(REQUEST_KEY_IN_RUNTIME_CONTEXT);

        if (request != null) {
            StackDepth stackDepth = (StackDepth) ContextManager.getRuntimeContext().get(CONTROLLER_METHOD_STACK_DEPTH);

            if (stackDepth == null) {
                final ContextCarrier contextCarrier = new ContextCarrier();

                if (IN_SERVLET_CONTAINER && IS_JAVAX && HttpServletRequest.class.isAssignableFrom(request.getClass())) {
                    final HttpServletRequest httpServletRequest = (HttpServletRequest) request;
                    CarrierItem next = contextCarrier.items();
                    while (next.hasNext()) {
                        next = next.next();
                        next.setHeadValue(httpServletRequest.getHeader(next.getHeadKey()));
                    }

                    String operationName = this.buildOperationName(method, httpServletRequest.getMethod(),
                                                                   (EnhanceRequireObjectCache) objInst.getSkyWalkingDynamicField());
                    AbstractSpan span = ContextManager.createEntrySpan(operationName, contextCarrier);
                    Tags.URL.set(span, httpServletRequest.getRequestURL().toString());
                    Tags.HTTP.METHOD.set(span, httpServletRequest.getMethod());
                    span.setComponent(ComponentsDefine.SPRING_MVC_ANNOTATION);
                    SpanLayer.asHttp(span);

                    if (SpringMVCPluginConfig.Plugin.SpringMVC.COLLECT_HTTP_PARAMS) {
                        RequestUtil.collectHttpParam(httpServletRequest, span);
                    }

                    if (!CollectionUtil.isEmpty(SpringMVCPluginConfig.Plugin.Http.INCLUDE_HTTP_HEADERS)) {
                        RequestUtil.collectHttpHeaders(httpServletRequest, span);
                    }
                } else if (IN_SERVLET_CONTAINER && IS_JAKARTA && jakarta.servlet.http.HttpServletRequest.class.isAssignableFrom(request.getClass())) {
                    final jakarta.servlet.http.HttpServletRequest httpServletRequest = (jakarta.servlet.http.HttpServletRequest) request;
                    CarrierItem next = contextCarrier.items();
                    while (next.hasNext()) {
                        next = next.next();
                        next.setHeadValue(httpServletRequest.getHeader(next.getHeadKey()));
                    }

                    String operationName =
                        this.buildOperationName(method, httpServletRequest.getMethod(),
                            (EnhanceRequireObjectCache) objInst.getSkyWalkingDynamicField());
                    AbstractSpan span =
                        ContextManager.createEntrySpan(operationName, contextCarrier);
                    Tags.URL.set(span, httpServletRequest.getRequestURL().toString());
                    Tags.HTTP.METHOD.set(span, httpServletRequest.getMethod());
                    span.setComponent(ComponentsDefine.SPRING_MVC_ANNOTATION);
                    SpanLayer.asHttp(span);

                    if (SpringMVCPluginConfig.Plugin.SpringMVC.COLLECT_HTTP_PARAMS) {
                        RequestUtil.collectHttpParam(httpServletRequest, span);
                    }

                    if (!CollectionUtil
                        .isEmpty(SpringMVCPluginConfig.Plugin.Http.INCLUDE_HTTP_HEADERS)) {
                        RequestUtil.collectHttpHeaders(httpServletRequest, span);
                    }
                } else if (ServerHttpRequest.class.isAssignableFrom(request.getClass())) {
                    final ServerHttpRequest serverHttpRequest = (ServerHttpRequest) request;
                    CarrierItem next = contextCarrier.items();
                    while (next.hasNext()) {
                        next = next.next();
                        next.setHeadValue(serverHttpRequest.getHeaders().getFirst(next.getHeadKey()));
                    }

                    String operationName = this.buildOperationName(method, serverHttpRequest.getMethod().name(),
                                                                   (EnhanceRequireObjectCache) objInst.getSkyWalkingDynamicField());
                    AbstractSpan span = ContextManager.createEntrySpan(operationName, contextCarrier);
                    Tags.URL.set(span, serverHttpRequest.getURI().toString());
                    Tags.HTTP.METHOD.set(span, serverHttpRequest.getMethod().name());
                    span.setComponent(ComponentsDefine.SPRING_MVC_ANNOTATION);
                    SpanLayer.asHttp(span);

                    if (SpringMVCPluginConfig.Plugin.SpringMVC.COLLECT_HTTP_PARAMS) {
                        RequestUtil.collectHttpParam(serverHttpRequest, span);
                    }

                    if (!CollectionUtil.isEmpty(SpringMVCPluginConfig.Plugin.Http.INCLUDE_HTTP_HEADERS)) {
                        RequestUtil.collectHttpHeaders(serverHttpRequest, span);
                    }
                } else {
                    throw new IllegalStateException("this line should not be reached");
                }

                stackDepth = new StackDepth();
                ContextManager.getRuntimeContext().put(CONTROLLER_METHOD_STACK_DEPTH, stackDepth);
            } else {
                AbstractSpan span = ContextManager.createLocalSpan(buildOperationName(objInst, method));
                span.setComponent(ComponentsDefine.SPRING_MVC_ANNOTATION);
            }

            stackDepth.increment();
        }
    }