public void beforeMethod()

in apm-sniffer/apm-sdk-plugin/vertx-plugins/vertx-core-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/vertx3/RouteStateInterceptor.java [63:103]
37 lines of code
9 McCabe index (conditional complexity)

    public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,
        MethodInterceptResult result) throws Throwable {
        RoutingContextImplBase routingContext = (RoutingContextImplBase) allArguments[0];
        List<Handler<RoutingContext>> contextHandlers = (List<Handler<RoutingContext>>) objInst.getSkyWalkingDynamicField();
        AtomicInteger currentContextIndex = (AtomicInteger) ((EnhancedInstance) routingContext).getSkyWalkingDynamicField();
        int handlerContextIndex = currentContextIndex.get();
        if (VertxContext.VERTX_VERSION >= 35 && contextHandlers.size() > 1) {
            currentContextIndex.getAndIncrement(); //3.5+ has possibility for multiple handlers
        }
        String contextName = contextHandlers.get(handlerContextIndex).getClass().getCanonicalName();
        int lambdaOffset = contextName.indexOf("$$Lambda$");
        if (lambdaOffset > 0) contextName = contextName.substring(0, lambdaOffset + 9);
        AbstractSpan span = ContextManager.createLocalSpan(String.format("%s.handle(RoutingContext)", contextName));

        Object connection = ((EnhancedInstance) routingContext.request()).getSkyWalkingDynamicField();
        VertxContext vertxContext = (VertxContext) ((EnhancedInstance) connection).getSkyWalkingDynamicField();

        String routeMethods = null;
        if (VertxContext.VERTX_VERSION >= 37.1) {
            if (routingContext.currentRoute().methods() != null) {
                routeMethods = "{" +
                        routingContext.currentRoute().methods()
                                .stream().map(Enum::toString)
                                .collect(Collectors.joining(","))
                        + "}";
            }
        } else {
            //no methods() method; have to strip from toString()
            Matcher matcher = HTTP_METHOD_PATTERN.matcher(routingContext.currentRoute().toString());
            if (matcher.find()) {
                routeMethods = "{" + matcher.group(1) + "}";
            }
        }
        if (routeMethods != null && routingContext.currentRoute().getPath() != null) {
            vertxContext.getSpan().setOperationName(routeMethods + routingContext.currentRoute().getPath());
        }

        ContextManager.continued(vertxContext.getContextSnapshot());
        span.setComponent(ComponentsDefine.VERTX);
        SpanLayer.asHttp(span);
    }