Subversion Repositories SmartDukaan

package in.shop2020.serving.controllers;

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

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

import in.shop2020.serving.utils.FileUtils;

import in.shop2020.serving.utils.Utils;

import in.shop2020.thrift.clients.CatalogServiceClient;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

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 List<String> bestDealSnippets = null;

	private static List<String> bestSellerSnippets = null;

	private static 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");

    	if(bestDealSnippets == null || bestSellerSnippets == null || latestArrivalSnippets == null){

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

            setSnippets();    	    

    	}	

    	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");

	    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() {

        List<Long> bestDealCatalogIds = null;

        List<Long> bestSellerCatalogIds = null;

        List<Long> latestArrivalCatalogIds = null;

        int bestSellerCount = 4;

        int latestArrivalCount = 4;

        try {

            CatalogServiceClient catalogServiceClient = new CatalogServiceClient();

            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, 10003);

            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 (InventoryServiceException 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);

    }

    /**

     * 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){

            try{

                snippets.add(FileUtils.read( Utils.EXPORT_ENTITIES_PATH + item + File.separator +"HomeSnippet.html"));

            }catch(IOException ioex){

                logger.error("Unable to get home page snippet for " + item, ioex);

            }

        }

        return snippets;

    }

}