Subversion Repositories SmartDukaan

package in.shop2020.serving.controllers;

import in.shop2020.datalogger.EventType;

import in.shop2020.model.v1.catalog.CatalogService.Client;

import in.shop2020.model.v1.catalog.CatalogServiceException;

import in.shop2020.serving.cache.EhcacheWrapper;

import in.shop2020.serving.services.ContentServingService;

import in.shop2020.serving.utils.SnippetType;

import in.shop2020.thrift.clients.CatalogClient;

import in.shop2020.utils.DataLogger;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import net.sf.ehcache.CacheManager;

import org.apache.log4j.Logger;

import org.apache.struts2.convention.annotation.Action;

import org.apache.thrift.TException;

/**

 * 

 * @author chandranshu

 *

 */

@SuppressWarnings("serial")

public class HomeController extends BaseController {

	private static Logger logger = Logger.getLogger(Class.class);

	private static final String BEST_DEALS_CACHE_KEY = "home_best_deals_snippet";

	private static final String BEST_SELLERS_CACHE_KEY = "home_best_sellers_snippet";

	private static final String LATEST_ARRIVALS_CACHE_KEY = "home_latest_arrivals_snippet";

	private static final String HOME_PAGE_CACHE_KEY = "home_page_cache_snippets";

	private List<String> bestDealSnippets = null;

	private List<String> bestSellerSnippets = null;

	private List<String> latestArrivalSnippets = null;

	public HomeController(){

		super();

	}

	/**

	 * Renders the home page. Loads the snippets for best deals, best sellers

	 * and latest arrivals if they haven't been loaded already.

	 * 

	 * @return Name of the view to render.

	 * @throws SecurityException

	 * @throws IOException

	 */

	@Action("/")

	public String index() throws SecurityException, IOException {

		logger.debug("userinfo:" + userinfo.toString());

		logger.info("Rendering the home page");

		setSnippets();

//		DataLogger.logData(EventType.HOME_PAGE, getSessionId(), userinfo.getUserId(), userinfo.getEmail());

		return "index";

	}

	/**

	 * Renders the home page but always loads the snippets for best deals, best

	 * sellers and latest arrivals unconditionally. Should be used to reset the

	 * snippets.

	 * 

	 * @return Name of the view to render.

	 * @throws SecurityException

	 * @throws IOException

	 */

	@Action("/refresh-home")

	public String destroy() throws SecurityException, IOException{

		logger.info("Reloading best deals, best sellers and latest arrivals");

		EhcacheWrapper<String, List<String>> homeSnippetCache = new EhcacheWrapper<String, List<String>>(

				EhcacheWrapper.HOME_PAGE_SNIPPET_CACHE_NAME, CacheManager.create());

		homeSnippetCache.removeAll();

		setSnippets();

		return "index";

	}

	public List<String> getBestDealSnippets(){

		return bestDealSnippets; 

	}

	public List<String> getBestSellerSnippets(){

		return bestSellerSnippets; 

	}

	public List<String> getLatestArrivalSnippets(){

		return latestArrivalSnippets;

	}

	/**

	 * Loads the snippets for best deals, best sellers and latest arrivals

	 * into memory.

	 */

	private void setSnippets() {

		EhcacheWrapper<String,Map<String, List<String>>> homeSnippetCache = new EhcacheWrapper<String,Map<String, List<String>>>(

				EhcacheWrapper.HOME_PAGE_SNIPPET_CACHE_NAME, CacheManager.create());

		//logger.info("Source id "+sourceId);

		Map<String, List<String>> homePageSnippets = homeSnippetCache.get(HOME_PAGE_CACHE_KEY);

		if(homePageSnippets == null) {

			homePageSnippets = new HashMap<String, List<String>>();

			List<Long> bestDealCatalogIds = null;

			List<Long> bestSellerCatalogIds = null;

			List<Long> latestArrivalCatalogIds = null;

			int bestSellerCount = 4;

			int latestArrivalCount = 4;

			try {

				CatalogClient catalogServiceClient = new CatalogClient();

				Client client = catalogServiceClient.getClient();

				//Get top 4 best deals 

				bestDealCatalogIds = client.getBestDealsCatalogIds(0, 4, null, -1);

				//Get top 8 best sellers b'coz 4 of them may overlap with best deals.

				bestSellerCatalogIds = client.getBestSellersCatalogIds(0, 8, null, -1);

				bestSellerCatalogIds.removeAll(bestDealCatalogIds);

				if(bestSellerCatalogIds.size() < bestSellerCount)

					bestSellerCount = bestSellerCatalogIds.size();

				//Get top 12 latest arrivals b'coz 4 of them may overlap with best deals

				//while another 4 may overlap with best sellers.

				latestArrivalCatalogIds = client.getLatestArrivalsCatalogIds(0, 12, null, Arrays.asList(new Long[]{ 10006L, 10010L, 10050L}));

				latestArrivalCatalogIds.removeAll(bestDealCatalogIds);

				latestArrivalCatalogIds.removeAll(bestSellerCatalogIds.subList(0, bestSellerCount)); //We're only considering the first 4 best sellers for removal.

				if(latestArrivalCatalogIds.size() < latestArrivalCount)

					latestArrivalCount = latestArrivalCatalogIds.size();

			} catch (CatalogServiceException e) {

				logger.error("Error while fetching data from the catalog service", e);

			} catch (TException e) {

				logger.error("Error while fetching data from the catalog service", e);

			} catch (Exception e) {

				logger.error("Unexpected exception", e);

			}

			bestDealSnippets = getSnippets(bestDealCatalogIds);

			bestSellerSnippets = getSnippets(bestSellerCatalogIds.subList(0, bestSellerCount));

			latestArrivalSnippets = getSnippets(latestArrivalCatalogIds.subList(0, latestArrivalCount));

			homePageSnippets.put(BEST_DEALS_CACHE_KEY, bestDealSnippets);

			homePageSnippets.put(BEST_SELLERS_CACHE_KEY, bestSellerSnippets);

			homePageSnippets.put(LATEST_ARRIVALS_CACHE_KEY, latestArrivalSnippets);

			homeSnippetCache.put(HOME_PAGE_CACHE_KEY, homePageSnippets);

			logger.info("Populated home snippet cache");

			return;

		}

		bestDealSnippets = homePageSnippets.get(BEST_DEALS_CACHE_KEY);

		bestSellerSnippets = homePageSnippets.get(BEST_SELLERS_CACHE_KEY);

		latestArrivalSnippets = homePageSnippets.get(LATEST_ARRIVALS_CACHE_KEY);

		logger.info("Returning snippets from cache");

	}

	/**

	 * Returns a list of snippets to be used on the home page corresponding to

	 * the given catalog ids. The snippets are in the same order as the ids in

	 * the input list. In case a snippet is not found for an entity, this method

	 * simply logs the problem and moves on.

	 * 

	 * @param catalogIds

	 *            Ids of the entities which we want to show.

	 * @return The snippet corresponding to each catalog entity

	 */

	private List<String> getSnippets(List<Long> catalogIds) {

		List<String> snippets = new ArrayList<String>();

		if(catalogIds == null)

			return snippets;

		for(Long item: catalogIds){

			snippets.add(ContentServingService.getSnippet(SnippetType.HOME_SNIPPET, item+"", sourceId));

		}

		return snippets;

	}

	@Override

	public String getHeaderSnippet() {

		String url = request.getQueryString();

		if (url == null) {

			url = "";

		} else {

			url = "?" + url;

		}

		url = request.getRequestURI() + url;

		return pageLoader.getHeaderHtml(userinfo.isLoggedIn(), userinfo.getEmail(),userinfo.getTotalItems(), url , 0, true, userinfo.isPrivateDealUser());

	}

	@Override

	public String getCartWidgetSnippet() {

		return pageLoader.getCartWidgetSnippet(userinfo.getTotalItems(), userinfo.getTotalAmount(),0, activeBanners.get("side-banner"),sideBannersMap);

	}

}