package org.kuali.student.common.ui.client.service;

 import com.google.gwt.user.client.rpc.AsyncCallback;

 import org.kuali.student.common.search.dto.SearchRequest;

 import org.kuali.student.common.search.dto.SearchResult;

 import java.util.HashMap;

 /**

  * @author Igor

  */

 public class CachingSearchService implements SearchRpcServiceAsync {

     private static CachingSearchService INSTANCE = new CachingSearchService();

     private SearchRpcServiceAsync searchService = SearchServiceFactory.getSearchService();

     private HashMap<SearchRequest, SearchResult> cache = new HashMap<SearchRequest, SearchResult>();

     public static CachingSearchService getSearchService() {

         return INSTANCE;

     }

     @Override

     public void search(final SearchRequest searchRequest, final AsyncCallback<SearchResult> callback) {

         cachingSearch(searchRequest, callback);

     }

     @Override

     public void cachingSearch(final SearchRequest searchRequest, final AsyncCallback<SearchResult> callback) {

         if (cache.containsKey(searchRequest)) {

             callback.onSuccess(cache.get(searchRequest));

         } else {

             searchService.cachingSearch(searchRequest, new AsyncCallback<SearchResult>() {

                 @Override

                 public void onFailure(Throwable caught) {

                     callback.onFailure(caught);

                 }

                 @Override

                 public void onSuccess(SearchResult searchResult) {

                     cache.put(searchRequest, searchResult);

                     callback.onSuccess(searchResult);

                 }

             });

         }

     }

 }