CacheController in Tridion DD4T 2.0

CacheController.java

/**
 * Use this controller to manually invalidate the DD4T and its dependency cache.
 * Please note: this controller for developers.
 */
@Controller
public class CacheController {

    private final Logger LOG = LoggerFactory.getLogger(getClass());

    private final ApplicationContext applicationContext;

    private EHCacheProvider ehCacheProvider;

    private PropertiesService propertiesService;

    private LabelExtractService labelExtractService;

    protected CacheProvider cacheProvider;

    private final int[] mutex = new int[0];

    @Autowired
    public CacheController(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    @RequestMapping(value = "/dd4t.cache.invalidate.form", method = GET)
    public String invalidate() {
        synchronized (mutex) {
            if (ehCacheProvider == null) {
                ehCacheProvider = applicationContext.getBean(EHCacheProvider.class);
            }
            ehCacheProvider.flush();
            applicationContext.getBean(LabelExtractService.class).clearCache();
            applicationContext.getBean(KeywordLabelService.class).clearCache();
            applicationContext.getBean(FAQLabelService.class).clearCache();
        }
        return "cache/invalidate";
    }


    private void instantiatePropertiesService() {
        this.propertiesService = this.propertiesService == null ? applicationContext.getBean(PropertiesService.class) : this.propertiesService;
    }

    @RequestMapping(value = "/showLabels.form", method = GET)
    public void showLabels(@RequestParam(required = true) int pubId,
                           HttpServletResponse response) {


        try {
            if (StringUtils.isEmpty(String.valueOf(pubId))) {
                pubId = <Defqault Publication ID>;// Default english
            }
            PrintWriter out = response.getWriter();

            labelExtractService = labelExtractService == null ? applicationContext.getBean(LabelExtractService.class) : labelExtractService;

            Map<String, String> springMap = labelExtractService.getLabelMap(pubId);
            out.println();
            out.println();
            out.println();

            out.println("##################### Label List From Spring ########################");
            for (Map.Entry<String, String> entry : springMap.entrySet()) {
                out.println(entry.getKey() + "  = " + entry.getValue());
            }

            out.println();
            out.println();
            out.println();
            out.println("##################### Label List from DD4T  ########################");


            Map<String, String> dd4tMap = LabelServiceFactoryImpl.getInstance().getLabelService().load(pubId);
            for (Map.Entry<String, String> entry : dd4tMap.entrySet()) {

                out.println(entry.getKey() + "  = " + entry.getValue());
            }

            cacheProvider = cacheProvider == null ? applicationContext.getBean(CacheProvider.class) : cacheProvider;

            cacheProvider.loadFromLocalCache("LabelMap-"+pubId).setExpired(true);



        } catch (Exception ex) {
            LOG.error(
                    String.format("Label service did not find FAQ publishing template for %s and pub id %s.", "faq_template", pubId), ex);
        }

    }
}