protected void activate()

in src/main/java/org/apache/sling/servlets/resolver/internal/resolution/ResolutionCache.java [97:148]
37 lines of code
5 McCabe index (conditional complexity)

    protected void activate(final BundleContext context,
            final ResolverConfig config) throws InvalidSyntaxException {
        // create cache - if a cache size is configured
        this.cacheSize = config.servletresolver_cacheSize();
        if (this.cacheSize > 5) {
            this.cache.set(new ConcurrentHashMap<>(cacheSize));
            this.logCacheSizeWarning = true;

            // register MBean
            try {
                Dictionary<String, String> mbeanProps = new Hashtable<>(); // NOSONAR
                mbeanProps.put("jmx.objectname", "org.apache.sling:type=servletResolver,service=SlingServletResolverCache");

                ServletResolverCacheMBeanImpl mbean = new ServletResolverCacheMBeanImpl();
                mbeanRegistration.set(context.registerService(SlingServletResolverCacheMBean.class, mbean, mbeanProps));
            } catch (final Throwable t) { // NOSONAR
                logger.warn("Unable to register servlets resolver cache MBean", t);
            }
        }

        // and finally register as event listener
        // to invalidate cache and script extensions
        final Dictionary<String, Object> props = new Hashtable<>(); // NOSONAR
        props.put(Constants.SERVICE_DESCRIPTION, "Apache Sling Servlet Resolver Event Handler");
        props.put(Constants.SERVICE_VENDOR,"The Apache Software Foundation");

        // the event listener is for updating the script engine extensions
        props.put(EventConstants.EVENT_TOPIC, new String[] {
                "javax/script/ScriptEngineFactory/*",
                "org/apache/sling/scripting/core/BindingsValuesProvider/*" });

        this.eventHandlerRegistration.set(context.registerService(EventHandler.class, this, props));

        // we need a resource change listener to invalidate the cache
        if ( this.cache != null ) {
            final String[] listenerPaths = new String[config.servletresolver_paths().length];
            for(int i=0; i<config.servletresolver_paths().length; i++) {
                final Path p = new Path(config.servletresolver_paths()[i]);
                listenerPaths[i] = p.getPath();
            }

            final Dictionary<String, Object> listenerProps = new Hashtable<>(); // NOSONAR
            listenerProps.put(Constants.SERVICE_DESCRIPTION, "Apache Sling Servlet Resolver Resource Listener");
            listenerProps.put(Constants.SERVICE_VENDOR,"The Apache Software Foundation");
            listenerProps.put(ResourceChangeListener.PATHS, listenerPaths);
            this.resourceListenerRegistration.set(context.registerService(ResourceChangeListener.class, this, listenerProps));
        }

        context.addServiceListener(this, "(".concat(Constants.OBJECTCLASS).concat("=org.apache.sling.adapter.Adaption)"));

        updateScriptEngineExtensions();
    }