protected void webConfig()

in meecrowave-core/src/main/java/org/apache/meecrowave/tomcat/MeecrowaveContextConfig.java [87:135]
45 lines of code
7 McCabe index (conditional complexity)

    protected void webConfig() {
        if (context.getServletContext().getAttribute("meecrowave.configuration") == null) { // redeploy
            context.getServletContext().setAttribute("meecrowave.configuration",
                    Meecrowave.Builder.class.isInstance(configuration) ? configuration : new Meecrowave.Builder(configuration));
            context.addServletContainerInitializer(intializer, emptySet());
        }

        if (!configuration.isTomcatScanning()) {
            super.webConfig();
            return;
        }

        // eagerly start CDI to scan only once and not twice (tomcat+CDI)
        final ClassLoader loader = context.getLoader().getClassLoader(); // should already be started at that point
        final Thread thread = Thread.currentThread();
        final ClassLoader old = thread.getContextClassLoader();
        thread.setContextClassLoader(loader);
        try {
            final ScannerService service = WebBeansContext.getInstance().getScannerService();
            if (OWBTomcatWebScannerService.class.isInstance(service)) {
                final OWBTomcatWebScannerService scannerService = OWBTomcatWebScannerService.class.cast(service);
                scannerService.setFilter(ofNullable(context.getJarScanner()).map(JarScanner::getJarScanFilter).orElse(null), context.getServletContext());
                scannerService.setDocBase(context.getDocBase());
                scannerService.setShared(configuration.getSharedLibraries());
                if (configuration.getWatcherBouncing() > 0) { // note that caching should be disabled with this config in most of the times
                    watcher = new ReloadOnChangeController(context, configuration.getWatcherBouncing(), redeployCallback);
                    scannerService.setFileVisitor(f -> watcher.register(f));
                }
                scannerService.scan();
                finder = scannerService.getFinder();
                finder.link();
                final CdiArchive archive = CdiArchive.class.cast(finder.getArchive());
                Stream.of(WebServlet.class, WebFilter.class, WebListener.class)
                        .forEach(marker -> finder.findAnnotatedClasses(marker).stream()
                                .filter(c -> !Modifier.isAbstract(c.getModifiers()) && Modifier.isPublic(c.getModifiers()))
                                .forEach(webComponent -> webClasses.computeIfAbsent(
                                        archive.classesByUrl().entrySet().stream()
                                                .filter(e -> e.getValue().getClassNames().contains(webComponent.getName()))
                                                .findFirst().get().getKey(), k -> new HashSet<>())
                                        .add(webComponent)));
            }

            super.webConfig();
        } finally {
            thread.setContextClassLoader(old);
            webClasses.clear();
            finder = null;
        }
    }