Logs message when a techrevel page is requested

RequestLoggingFilter.java

package blog.techrevel.service.impl;

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import static org.apache.sling.engine.EngineConstants.*;
import org.apache.sling.api.resource.Resource;
import org.osgi.service.component.annotations.Component;
import org.osgi.framework.Constants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.day.cq.wcm.api.Page;
import com.day.cq.wcm.api.PageManager;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;

@Component(service = Filter.class, name = "Custom Logging Filter", property = {
		SLING_FILTER_SCOPE + "=" + FILTER_SCOPE_REQUEST, Constants.SERVICE_RANKING + ":Integer=1",
		SLING_FILTER_PATTERN + "=/content/techrevelblog/.*" })

public class RequestLoggingFilter implements Filter {
	private static final Logger log = LoggerFactory.getLogger(RequestLoggingFilter.class.getName());

	// Called by the web container to indicate to a filter that it is being placed
	// into service.

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}

	// Called by the web container to indicate to a filter that it is being taken
	// out of service.
	@Override
	public void destroy() {
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {

		if (request instanceof SlingHttpServletRequest && response instanceof SlingHttpServletResponse) {

			// Do work before sending the request down the Filter AND Sling processing chain
			final SlingHttpServletRequest slingRequest = (SlingHttpServletRequest) request;
			final Resource resource = slingRequest.getResource();
			if (resource.getResourceType().equals("cq:Page")) {
				PageManager pageManager = resource.getResourceResolver().adaptTo(PageManager.class);
				Page page = pageManager.getPage(resource.getPath());

				String templatePath = page.getContentResource().getResourceType();
				if (templatePath.equals("techrevelblog/components/structure/page")) {
					log.info("Pages from techrevel accessed !!!!");
				}
			}

			chain.doFilter(request, response);
			// The Request/Response have now been fully processed by Sling/AEM

		} else {
			// Else process the chain as usual.
			chain.doFilter(request, response);
			return;
		}

	}

}