package org.gcube.portlets.user.databasesmanager.server;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;

import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.config.CacheConfiguration;

import org.apache.regexp.RE;
import org.gcube.application.framework.core.session.ASLSession;
import org.gcube.common.scope.api.ScopeProvider;
import org.gcube.contentmanager.storageclient.model.protocol.smp.SMPURLConnection;
import org.gcube.data.analysis.statisticalmanager.proxies.StatisticalManagerDSL;
import org.gcube.data.analysis.statisticalmanager.proxies.StatisticalManagerFactory;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMAlgorithm;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMComputationConfig;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMComputationRequest;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMGroupedAlgorithms;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMListGroupedAlgorithms;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMOperationStatus;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMParameter;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMParameters;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMResourceType;
import org.gcube.data.analysis.statisticalmanager.stubs.types.SMTypeParameter;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMAbstractResource;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMComputation;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMEntries;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMFile;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMInputEntry;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMObject;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMOperationInfo;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMResource;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.SMTable;
import org.gcube.data.analysis.statisticalmanager.stubs.types.schema.StatisticalServiceType;
import org.gcube.dataanalysis.ecoengine.datatypes.enumtypes.PrimitiveTypes;
import org.gcube.portlets.user.databasesmanager.client.GWTdbManagerService;
import org.gcube.portlets.user.databasesmanager.client.datamodel.ComputationOutput;
import org.gcube.portlets.user.databasesmanager.client.datamodel.FileModel;
import org.gcube.portlets.user.databasesmanager.client.datamodel.Parameter;
import org.gcube.portlets.user.databasesmanager.client.datamodel.Result;
import org.gcube.portlets.user.databasesmanager.client.datamodel.Row;
import org.gcube.portlets.user.databasesmanager.server.util.SessionUtil;
import org.gcube.portlets.user.databasesmanager.server.util.WsUtil;

import com.extjs.gxt.ui.client.data.BasePagingLoadResult;
import com.extjs.gxt.ui.client.data.PagingLoadConfig;
import com.extjs.gxt.ui.client.data.PagingLoadResult;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.thoughtworks.xstream.XStream;
import org.apache.log4j.Logger;
//import org.apache.jcs.JCS;
//import org.apache.jcs.access.CacheAccess;
//import org.apache.jcs.utils.props.PropertyLoader;

public class GWTdbManagerServiceImpl extends RemoteServiceServlet implements
		GWTdbManagerService {

	// // the result generated in the LoadTables method
	// private List<Result> result = null;

	// logger
	private static Logger logger = Logger
			.getLogger(GWTdbManagerServiceImpl.class);

	// private CacheManager cacheManager;
	private static Ehcache employeeCache;

	public GWTdbManagerServiceImpl() throws Exception {

		// create the cache
		// CacheManager cacheManager;
		// ClassLoader contextClassLoader =
		// Thread.currentThread().getContextClassLoader();
		// InputStream resourceAsStream =
		// contextClassLoader.getResourceAsStream("ehcache.xml");
		// cacheManager = CacheManager.create(resourceAsStream);

		// TODO: DA MODIFICARE LA MODALITÀ DI RECUPERO DEL FILE
		try {

			// CacheManager cacheManager = CacheManager
			// .newInstance("/home/loredana/workspace/databases-manager-portlet-TRUNK/configCache/encache.xml");

			// InputStream is =
			// ClassLoader.getSystemResourceAsStream("encache.xml");
			// CacheManager cacheManager = CacheManager.newInstance(is);
			// is.close();

			URL url = getClass().getResource("/encache.xml");
			CacheManager cacheManager = CacheManager.newInstance(url);
			// getcache
			employeeCache = cacheManager.getEhcache("DBCache");
			
			//set Disk Store Path in the configuration file encache.xml
//			CacheConfiguration config = employeeCache.getCacheConfiguration();
//			String DiskCacheFolderName="DBManagerDisk";
////			config.setDiskStorePath(this.getServletContext().getRealPath("")+DiskCacheFolderName);
//			
//			config.setDiskStorePath(this.getServletContext().getRealPath("")+DiskCacheFolderName);

		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			throw new Exception("Failed to get cache. " + e);
		}

	}

	@Override
	public void init() throws ServletException {
		
		
		super.init();

		
		//TODO MODIFY: SET THE NAME OF THE CACHE DISK WITH CODE AND NOT IN FILE ENCACHE.XML
		
//		String path = System.getenv("CATALINA_TMPDIR");
//		System.out.println("Path: " + this.getServletContext().getRealPath(""));
		
//		System.out.println("Path: " + path); 
		
		
		//create folder for caching data
//		String DiskCacheFolderName="DBManagerDisk";
//		File f = new File(this.getServletContext().getRealPath("")+DiskCacheFolderName);
		
//		CacheConfiguration config = employeeCache.getCacheConfiguration();
//		String DiskCacheFolderName="DBManagerDisk";
//		config.setDiskStorePath(this.getServletContext().getRealPath("")+DiskCacheFolderName);
		
//		config.setDiskStorePath(path+"/"+DiskCacheFolderName);
		
//		File f = new File(path+"/"+DiskCacheFolderName);
//		
//		if (!f.exists()){
//			f.mkdir();
//		}
	    
	}

	private void initVariables() {

		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());

		// the result generated in the LoadTables method
		List<Result> result = new ArrayList<Result>();
		session.setAttribute("TablesResult", result);

		// map that contains the submit query result and the related uid
		HashMap<String, List<Result>> submitQueryResult = new HashMap<String, List<Result>>();
		session.setAttribute("submitQueryResult", submitQueryResult);

		// map that contains the submit query result parsed and the related
		// uid
		HashMap<String, List<Row>> submitQueryResultParsed = new HashMap<String, List<Row>>();
		session.setAttribute("submitQueryResultParsed", submitQueryResultParsed);

		// information about a database
		String currentDB = "";
		session.setAttribute("currentDB", currentDB);
		String previousDB = "";
		session.setAttribute("previousDB", previousDB);

		// information about a schema
		String currentSchema = "";
		session.setAttribute("currentSchema", currentSchema);
		String previousSchema = "";
		session.setAttribute("previousSchema", previousSchema);

		// Hashmap that contains computationId with a uid key
		HashMap<String, String> computationIDMap = new HashMap<String, String>();
		session.setAttribute("ComputationIDList", computationIDMap);

		// Hashmap that contains the job status with a uid key
		HashMap<String, String> JobStatusMap = new HashMap<String, String>();
		session.setAttribute("JobStatusList", JobStatusMap);
	}

	// to get resources from IS
	@Override
	public List<FileModel> getResource() throws Exception {
		// initialize variables with application startup
		initVariables();

		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// data output
		List<FileModel> outputParameters = new ArrayList<FileModel>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("LISTDBNAMES")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm specified by id
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");

			// // print check input parameters
			// for (int i = 0; i < inputParameters.size(); i++) {
			// logger.info(inputParameters.get(i).getName());
			// }

			// check if the value is in cache. If data does not exist in cache
			// the computation is started otherwise data are retrieved from
			// cache.

			try {
				// //get data from cache
				// Ehcache employeeCache;
				// employeeCache = cacheManager.getEhcache("myCache");

				// get data from cache
				// check if data exist considering as key the input parameters
				String key = inputParameters.get(0).getDefaultValue();

				// System.out.println("***KEY: " + key);
				// net.sf.ehcache.Element dataFromCache =
				// employeeCache.get(key);
				net.sf.ehcache.Element dataFromCache = getDataFromCache(key);

				Object value = null;
				if (dataFromCache != null) {
					value = dataFromCache.getObjectValue();
//					System.out.println("***GETTING DATA FROM CACHE");
				}
				if (value != null) {
					outputParameters = (List<FileModel>) value;
				} else {
					// start the computation
//					System.out.println("***STARTING THE COMPUTATION");
					// create data structure for data output
					ComputationOutput outputData = new ComputationOutput();
					// computationId
					String computationId = startComputation(algorithmId,
							inputParameters, outputData);

					// print check
					// retrieve data
					// logger.info("output data retrieved");

					// data output
					LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
					mapValues = outputData.getMapValues();

					for (int i = 0; i < mapValues.size(); i++) {
						FileModel obj = new FileModel(mapValues.get(String
								.valueOf(i)));
						// obj.setIsLoaded(true);
						outputParameters.add(obj);
					}

					if (outputParameters != null
							&& outputParameters.size() != 0) {
						// put data in cache
						net.sf.ehcache.Element dataToCache = new net.sf.ehcache.Element(
								inputParameters.get(0).getDefaultValue(),
								outputParameters);

						insertDataIntoCache(dataToCache);
						// employeeCache.put(dataToCache);
					}
				}

			} catch (Exception e) {
				// TODO: handle exception
				// e.printStackTrace();
				throw new Exception("Failed to load data. " + e);
			}

			// // create data structure for data output
			// ComputationOutput outputData = new ComputationOutput();
			// // computationId
			// String computationId = startComputation(algorithmId,
			// inputParameters,
			// outputData);
			//
			// // print check
			// // retrieve data
			// // logger.info("output data retrieved");
			//
			// // data output
			// LinkedHashMap<String, String> mapValues = new
			// LinkedHashMap<String, String>();
			// mapValues = outputData.getMapValues();
			//
			// for (int i = 0; i < mapValues.size(); i++) {
			// FileModel obj = new FileModel(mapValues.get(String.valueOf(i)));
			// // obj.setIsLoaded(true);
			// outputParameters.add(obj);
			// }

		}
		return outputParameters;
	}

	// to get information about databases of a resource
	@Override
	public LinkedHashMap<String, FileModel> getDBInfo(String resourceName)
			throws Exception {
		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// data output
		LinkedHashMap<String, FileModel> outputParameters = new LinkedHashMap<String, FileModel>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("LISTDBINFO")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm specified by id
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");

			inputParameters.get(0).setValue(resourceName);

			// print check
			// logger.info(inputParameters.get(0).getName());

			try {
				// get data from cache
				// check if data exist considering as key the input parameters
				String key = inputParameters.get(0).getValue();

				// System.out.println("***KEY: " + key);
				// net.sf.ehcache.Element dataFromCache =
				// employeeCache.get(key);

				net.sf.ehcache.Element dataFromCache = getDataFromCache(key);

				Object value = null;
				if (dataFromCache != null) {
					value = dataFromCache.getObjectValue();
				}
				if (value != null) {
					outputParameters = (LinkedHashMap<String, FileModel>) value;
//					System.out.println("***GETTING DATA FROM CACHE");
				} else {
					// start the computation
//					System.out.println("***STARTING THE COMPUTATION");
					// create data structure
					ComputationOutput outputData = new ComputationOutput();
					// computation id
					String computationId = startComputation(algorithmId,
							inputParameters, outputData);

					// print check
					// retrieve data
					// logger.info("output data retrieved");

					// data output values
					LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
					// data output keys
					LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

					mapValues = outputData.getMapValues();
					mapKeys = outputData.getmapKeys();

					for (int i = 0; i < mapValues.size(); i++) {
						FileModel obj = new FileModel(mapValues.get(String
								.valueOf(i)));
						// obj.setIsLoaded(true);

						// print check
						// logger.info("value: " +
						// mapValues.get(String.valueOf(i)));
						// logger.info("key: " +
						// mapKeys.get(String.valueOf(i)));
						outputParameters.put(mapKeys.get(String.valueOf(i)),
								obj);
					}

					// write data in cache
					if (outputParameters != null
							&& outputParameters.size() != 0) {
						// put data in cache
						net.sf.ehcache.Element dataToCache = new net.sf.ehcache.Element(
								inputParameters.get(0).getValue(),
								outputParameters);

						insertDataIntoCache(dataToCache);
						// employeeCache.put(dataToCache);
					}

				}

			} catch (Exception e) {
				// TODO: handle exception
				e.printStackTrace();
				throw new Exception("Failed to load data. " + e);
			}

		}

		// // create data structure
		// ComputationOutput outputData = new ComputationOutput();
		// // computation id
		// String computationId = startComputation(algorithmId, inputParameters,
		// outputData);
		//
		// // print check
		// // retrieve data
		// // logger.info("output data retrieved");
		//
		// // data output values
		// LinkedHashMap<String, String> mapValues = new LinkedHashMap<String,
		// String>();
		// // data output keys
		// LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String,
		// String>();
		//
		// mapValues = outputData.getMapValues();
		// mapKeys = outputData.getmapKeys();
		//
		// for (int i = 0; i < mapValues.size(); i++) {
		// FileModel obj = new FileModel(mapValues.get(String.valueOf(i)));
		// // obj.setIsLoaded(true);
		//
		// // print check
		// // logger.info("value: " + mapValues.get(String.valueOf(i)));
		// // logger.info("key: " + mapKeys.get(String.valueOf(i)));
		// outputParameters.put(mapKeys.get(String.valueOf(i)), obj);
		// }
		//
		// // write data in cache
		// if (outputParameters != null && outputParameters.size() != 0) {
		// // put data in cache
		// net.sf.ehcache.Element dataToCache = new net.sf.ehcache.Element(
		// inputParameters.get(0).getDefaultValue(), outputParameters);
		// employeeCache.put(dataToCache);
		// }

		return outputParameters;
	}

	// to get schema for a database
	@Override
	public List<FileModel> getDBSchema(LinkedHashMap<String, String> dataInput)
			throws Exception {

		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// data output
		List<FileModel> outputParameters = new ArrayList<FileModel>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("LISTDBSCHEMA")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm specified by id
		inputParameters = getParameters(algorithmId);

		// print check
		logger.info("dbmanager-> ResourceName: "
				+ dataInput.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: "
				+ dataInput.get("DatabaseName"));

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");

			inputParameters.get(0).setValue(dataInput.get("ResourceName"));
			inputParameters.get(1).setValue(dataInput.get("DatabaseName"));

			// print check algorithm input parameters
			// for (int i = 0; i < inputParameters.size(); i++) {
			// logger.info(inputParameters.get(i).getName());
			// }

			try {
				// get data from cache
				// check if data exist considering as key the input parameters
				String key = inputParameters.get(0).getValue()
						+ inputParameters.get(1).getValue();

				// System.out.println("key: " + key);
				// net.sf.ehcache.Element dataFromCache =
				// employeeCache.get(key);

				net.sf.ehcache.Element dataFromCache = getDataFromCache(key);

				Object value = null;
				if (dataFromCache != null) {
					value = dataFromCache.getObjectValue();
				}
				if (value != null) {
					outputParameters = (List<FileModel>) value;
				} else {
					// start the computation
					// create data structure
					ComputationOutput outputData = new ComputationOutput();
					// computation id
					String computationId = startComputation(algorithmId,
							inputParameters, outputData);

					// print check
					// retrieve data
					// logger.info("dbmanager-> output data retrieved");

					// data output values
					LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
					// data output keys
					LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

					mapValues = outputData.getMapValues();
					mapKeys = outputData.getmapKeys();

					for (int i = 0; i < mapValues.size(); i++) {
						FileModel obj = new FileModel(mapValues.get(String
								.valueOf(i)));
						// obj.setIsSchema(true);
						// obj.setIsLoaded(true);
						outputParameters.add(obj);
					}

					// write data in cache
					if (outputParameters != null
							&& outputParameters.size() != 0) {
						// put data in cache
						net.sf.ehcache.Element dataToCache = new net.sf.ehcache.Element(
								inputParameters.get(0).getValue()
										+ inputParameters.get(1).getValue(),
								outputParameters);

						insertDataIntoCache(dataToCache);
						// employeeCache.put(dataToCache);
					}

				}

			} catch (Exception e) {
				// TODO: handle exception
				e.printStackTrace();
				throw new Exception("Failed to load data. " + e);

			}

		}

		// // create data structure
		// ComputationOutput outputData = new ComputationOutput();
		// // computation id
		// String computationId = startComputation(algorithmId, inputParameters,
		// outputData);
		//
		// // print check
		// // retrieve data
		// // logger.info("dbmanager-> output data retrieved");
		//
		// // data output values
		// LinkedHashMap<String, String> mapValues = new LinkedHashMap<String,
		// String>();
		// // data output keys
		// LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String,
		// String>();
		//
		// mapValues = outputData.getMapValues();
		// mapKeys = outputData.getmapKeys();
		//
		// for (int i = 0; i < mapValues.size(); i++) {
		// FileModel obj = new FileModel(mapValues.get(String.valueOf(i)));
		// // obj.setIsSchema(true);
		// // obj.setIsLoaded(true);
		// outputParameters.add(obj);
		// }
		//
		// // write data in cache
		// if (outputParameters != null
		// && outputParameters.size() != 0) {
		// // put data in cache
		// net.sf.ehcache.Element dataToCache = new net.sf.ehcache.Element(
		// inputParameters.get(0).getDefaultValue(),
		// outputParameters);
		// employeeCache.put(dataToCache);
		// }

		return outputParameters;
	}

	// to get tables
	private List<Result> getTables(LinkedHashMap<String, String> dataInput)
			throws Exception {
		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// data output
		List<Result> outputParameters = new ArrayList<Result>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("LISTTABLES")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");
		}

		// print check algorithm input parameters
		// for (int i = 0; i < inputParameters.size(); i++) {
		// logger.info(inputParameters.get(i).getName());
		// }

		inputParameters.get(0).setValue(dataInput.get("ResourceName"));
		inputParameters.get(1).setValue(dataInput.get("DatabaseName"));
		inputParameters.get(2).setValue(dataInput.get("SchemaName"));

		// print check
		logger.info("dbmanager-> ResourceName: "
				+ dataInput.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: "
				+ dataInput.get("DatabaseName"));
		logger.info("dbmanager-> SchemaName: " + dataInput.get("SchemaName"));

		// create data structure
		ComputationOutput outputData = new ComputationOutput();
		// computation id
		String computationId = startComputation(algorithmId, inputParameters,
				outputData);

		// print check on retrieving data
		// logger.info("output data retrieved");

		// data output values
		LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
		// data output keys
		LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

		mapValues = outputData.getMapValues();
		mapKeys = outputData.getmapKeys();

		for (int i = 0; i < mapValues.size(); i++) {
			Result row = new Result(String.valueOf(i), mapValues.get(String
					.valueOf(i)));
			outputParameters.add(row);
		}
		return outputParameters;
	}

	// to load tables
	@Override
	public PagingLoadResult<Result> LoadTables(PagingLoadConfig config,
			LinkedHashMap<String, String> dataInput, boolean SearchTable,
			String keyword) throws Exception {

		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		List<Result> result = (List<Result>) session
				.getAttribute("TablesResult");

		// check on a database
		String currentDB = "";
		currentDB = dataInput.get("DatabaseName");
		String previousDB = (String) session.getAttribute("previousDB");

		if (!currentDB.equals(previousDB)) {
			// result = null;
			result = new ArrayList<Result>();
			System.gc();
		}

		previousDB = currentDB;
		session.setAttribute("previousDB", previousDB);

		// check on a schema
		String currentSchema = "";
		currentSchema = dataInput.get("SchemaName");
		String previousSchema = (String) session.getAttribute("previousSchema");
		if (!currentSchema.equals(previousSchema)) {
			// result = null;
			result = new ArrayList<Result>();
			System.gc();
		}

		previousSchema = currentSchema;
		session.setAttribute("previousSchema", previousSchema);

		// get tables
		// if (result == null)
		// result = getTables(dataInput);
		if (result.size() == 0)
			result = getTables(dataInput);

		// Create a sublist and add data to list according
		// to the limit and offset value of the config
		List<Result> sublist = new ArrayList<Result>();
		BasePagingLoadResult loadResult = null;

		// print check on the search
		// logger.info("Searching in the table: " + SearchTable);
		// logger.info("Keyword to search: " + keyword);

		int start = config.getOffset();
		int limit = result.size();

		if (config.getLimit() > 0) {
			limit = Math.min(start + config.getLimit(), limit);
		}

		int totalNumber = result.size();

		if ((SearchTable == false) || keyword == null || keyword.length() == 0) {
			sublist = new ArrayList<Result>(result.subList(start, limit));
		} else {
			// print check
			// logger.info("searching the table");

			// search the table
			for (int i = 0; i < result.size(); i++) {
				if ((result.get(i).getValue().toLowerCase()).startsWith(keyword
						.toLowerCase())) {
					sublist.add(result.get(i));
				}
			}

			limit = sublist.size();
			int sublen = sublist.size();
			totalNumber = sublen;

			if (start < sublen - 1) {
				limit = Math.min(sublen, limit);
				totalNumber = sublist.size();
				sublist = new ArrayList<Result>(sublist.subList(start, limit));
			}
		}

		// print check
		// logger.info("result size: " + totalNumber);
		// logger.info("limit: " + limit);
		// logger.info("offset: " + config.getOffset());
		// logger.info("start: " + start);

		loadResult = new BasePagingLoadResult<Result>(sublist,
				config.getOffset(), totalNumber);
		session.setAttribute("TablesResult", result);
		return loadResult;
	}

	// to submit a query
	@Override
	public List<String> submitQuery(LinkedHashMap<String, String> dataDB,
			String query, boolean valueReadOnlyQuery,
			boolean smartCorrectionQuery, String language, String UID)
			throws Exception {

		logger.info("dbmanager-> Dialect used for smart correction: "
				+ language);

		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// data output
		// List<Result> output = new ArrayList<Result>();
		List<Result> output = null;

		// list that contains table attributes
		List<String> listAttributes = null;

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("SUBMITQUERY")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");
		}

		// print check
		// for (int i = 0; i < inputParameters.size(); i++) {
		// logger.info(inputParameters.get(i).getName());
		// }

		// print check
		logger.info("dbmanager-> ResourceName: " + dataDB.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: " + dataDB.get("DatabaseName"));
		logger.info("dbmanager-> Query: " + query);
		logger.info("dbmanager-> SmartCorrections check: "
				+ smartCorrectionQuery);

		inputParameters.get(0).setValue(dataDB.get("ResourceName"));
		inputParameters.get(1).setValue(dataDB.get("DatabaseName"));
		inputParameters.get(2).setValue(String.valueOf(valueReadOnlyQuery));
		inputParameters.get(3).setValue(String.valueOf(smartCorrectionQuery));
		inputParameters.get(4).setValue(language);
		inputParameters.get(5).setValue(query);

		// create data structure
		ComputationOutput outputData = new ComputationOutput();
		try {
			// computation id
			String computationId = startComputation(algorithmId,
					inputParameters, outputData, UID);

			// get JobID
			if (checkJob(UID)) {
				// computationIDMap.put(id, computationId);

				// print check on retrieving data
				// logger.info("output data retrieved");

				// data output values
				LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
				// data output keys
				LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

				mapValues = outputData.getMapValues();
				mapKeys = outputData.getmapKeys();

				if (mapValues.size() != 0) {
					output = new ArrayList<Result>();

					// logger.info("build the result - started");
					for (int i = 0; i < mapValues.size(); i++) {
						Result row = new Result(mapKeys.get(String.valueOf(i)),
								mapValues.get(String.valueOf(i)));
						output.add(row);
					}

					// System.out.println("output size submit: " +
					// output.size());
					// logger.info("build the result - finished");

					// get the attributes list for the result table
					listAttributes = new ArrayList<String>();
					listAttributes = getListAttributes(output.get(0).getValue());
					// remove the header in order to parse only the result
					output.remove(0);
					// store the result of the submit query operation
					updateSubmitQueryResultMap(UID, output);
					// remove job with the specified uid
					removeJob(UID);
				}
			} else {
				listAttributes = null;
			}
		} catch (Exception e) {
			// e.printStackTrace();
			// TODO TO REMOVE. Exception Statistical management to remove a
			// computation
			if (e.getMessage()
					.contains(
							"javax.xml.ws.soap.SOAPFaultException: java.lang.IndexOutOfBoundsException")) {
				e = new Exception("ServerException");
			}
			throw e;
		}
		return listAttributes;
	}

	@Override
	public List<Result> sample(LinkedHashMap<String, String> dataInput)
			throws Exception {
		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// output sample result
		List<Result> output = new ArrayList<Result>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("SAMPLEONTABLE")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm specified by id
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");
		}

		// print check
		// for (int i = 0; i < inputParameters.size(); i++) {
		// logger.info(inputParameters.get(i).getName());
		// }

		// print check
		logger.info("dbmanager-> ResourceName: "
				+ dataInput.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: "
				+ dataInput.get("DatabaseName"));
		logger.info("dbmanager-> SchemaName: " + dataInput.get("SchemaName"));
		logger.info("dbmanager-> TableName: " + dataInput.get("TableName"));

		inputParameters.get(0).setValue(dataInput.get("ResourceName"));
		inputParameters.get(1).setValue(dataInput.get("DatabaseName"));
		inputParameters.get(2).setValue(dataInput.get("SchemaName"));
		inputParameters.get(3).setValue(dataInput.get("TableName"));

		// create data structure
		ComputationOutput outputData = new ComputationOutput();
		// computation id
		String computationId = startComputation(algorithmId, inputParameters,
				outputData);

		// print check on retrieving data
		// logger.info("output data retrieved");

		// data output values
		LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
		// data output keys
		LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

		mapValues = outputData.getMapValues();
		mapKeys = outputData.getmapKeys();

		for (int i = 0; i < mapValues.size(); i++) {
			Result row = new Result(mapKeys.get(String.valueOf(i)),
					mapValues.get(String.valueOf(i)));
			output.add(row);
		}
		return output;
	}

	@Override
	public List<Result> smartSample(LinkedHashMap<String, String> dataInput)
			throws Exception {
		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// output sample result
		List<Result> output = new ArrayList<Result>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("SMARTSAMPLEONTABLE")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");
		}

		// print check
		// for (int i = 0; i < inputParameters.size(); i++) {
		// logger.info(inputParameters.get(i).getName());
		// }

		// print check
		logger.info("dbmanager-> ResourceName: "
				+ dataInput.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: "
				+ dataInput.get("DatabaseName"));
		logger.info("dbmanager-> SchemaName: " + dataInput.get("SchemaName"));
		logger.info("dbmanager-> TableName: " + dataInput.get("TableName"));

		inputParameters.get(0).setValue(dataInput.get("ResourceName"));
		inputParameters.get(1).setValue(dataInput.get("DatabaseName"));
		inputParameters.get(2).setValue(dataInput.get("SchemaName"));
		inputParameters.get(3).setValue(dataInput.get("TableName"));

		// create data structure
		ComputationOutput outputData = new ComputationOutput();
		// computation id
		String computationId = startComputation(algorithmId, inputParameters,
				outputData);

		// print check on retrieving data
		// logger.info("dbmanager-> output data retrieved");

		// data output values
		LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
		// data output keys
		LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

		mapValues = outputData.getMapValues();
		mapKeys = outputData.getmapKeys();

		for (int i = 0; i < mapValues.size(); i++) {
			Result row = new Result(mapKeys.get(String.valueOf(i)),
					mapValues.get(String.valueOf(i)));
			output.add(row);
		}
		return output;
	}

	@Override
	public List<Result> randomSample(LinkedHashMap<String, String> dataInput)
			throws Exception {

		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// output sample result
		List<Result> output = new ArrayList<Result>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("RANDOMSAMPLEONTABLE")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm specified by id
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");
		}

		// print check algorithm input parameters
		// for (int i = 0; i < inputParameters.size(); i++) {
		// logger.info(inputParameters.get(i).getName());
		// }

		// print check
		logger.info("dbmanager-> ResourceName: "
				+ dataInput.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: "
				+ dataInput.get("DatabaseName"));
		logger.info("dbmanager-> SchemaName: " + dataInput.get("SchemaName"));
		logger.info("dbmanager-> TableName: " + dataInput.get("TableName"));

		inputParameters.get(0).setValue(dataInput.get("ResourceName"));
		inputParameters.get(1).setValue(dataInput.get("DatabaseName"));
		inputParameters.get(2).setValue(dataInput.get("SchemaName"));
		inputParameters.get(3).setValue(dataInput.get("TableName"));

		// create data structure
		ComputationOutput outputData = new ComputationOutput();
		// computation id
		String computationId = startComputation(algorithmId, inputParameters,
				outputData);

		// print check on retrieving data
		// logger.info("dbmanager-> output data retrieved");

		// data output values
		LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
		// data output keys
		LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

		mapValues = outputData.getMapValues();
		mapKeys = outputData.getmapKeys();

		for (int i = 0; i < mapValues.size(); i++) {
			Result row = new Result(mapKeys.get(String.valueOf(i)),
					mapValues.get(String.valueOf(i)));
			output.add(row);
		}
		return output;
	}

	@Override
	public LinkedHashMap<String, FileModel> getTableDetails(
			LinkedHashMap<String, String> dataInput) throws Exception {
		// data input
		List<Parameter> inputParameters = new ArrayList<Parameter>();
		// data ouptut
		LinkedHashMap<String, FileModel> outputParameters = new LinkedHashMap<String, FileModel>();

		// get list of algorithms
		List<String> algorithms = new ArrayList<String>();
		algorithms = getDatabaseManagerAlgorithms();

		// get algorithmId
		String algorithmId = null;

		for (int i = 0; i < algorithms.size(); i++) {
			if (algorithms.get(i).equals("GETTABLEDETAILS")) {
				algorithmId = algorithms.get(i);
				// print check
				// logger.info("algorithmId: " + algorithmId);
			}
		}

		// get input parameters of the algorithm specified by id
		inputParameters = getParameters(algorithmId);

		if (inputParameters.size() != 0) {
			// print check
			logger.info("dbmanager-> algorithm input parameters retrieved");
		}

		// print check algorithm input parameters
		// for (int i = 0; i < inputParameters.size(); i++) {
		// logger.info(inputParameters.get(i).getName());
		// }

		// print check
		logger.info("dbmanager-> ResourceName: "
				+ dataInput.get("ResourceName"));
		logger.info("dbmanager-> DatabaseName: "
				+ dataInput.get("DatabaseName"));
		logger.info("dbmanager-> SchemaName: " + dataInput.get("SchemaName"));
		logger.info("dbmanager-> TableName: " + dataInput.get("TableName"));

		inputParameters.get(0).setValue(dataInput.get("ResourceName"));
		inputParameters.get(1).setValue(dataInput.get("DatabaseName"));
		inputParameters.get(2).setValue(dataInput.get("SchemaName"));
		inputParameters.get(3).setValue(dataInput.get("TableName"));

		// create data structure
		ComputationOutput outputData = new ComputationOutput();
		// computation id
		String computationId = startComputation(algorithmId, inputParameters,
				outputData);

		// print check on retrieving data
		// logger.info("output data retrieved");

		// output data values
		LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
		// output data keys
		LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

		mapValues = outputData.getMapValues();
		mapKeys = outputData.getmapKeys();

		for (int i = 0; i < mapValues.size(); i++) {
			FileModel obj = new FileModel(mapValues.get(String.valueOf(i)));
			// obj.setIsLoaded(true);
			outputParameters.put(mapKeys.get(String.valueOf(i)), obj);
			// print check
			// logger.info("value: " + outputMap.get(String.valueOf(i)));
			// logger.info("key: " + outputKey.get(String.valueOf(i)));
		}
		return outputParameters;
	}

	// parse result for Submit query
	public PagingLoadResult<Row> loadSubmitResult(PagingLoadConfig config,
			List<String> listAttributes, String UID) throws Exception {
		// System.out.println("Server - loadSubmitResultMethod");
		// data parsed
		List<Row> data = new ArrayList<Row>();
		// submit query result
		List<Result> result = new ArrayList<Result>();
		// get parsed data
		data = getSubmitQueryResultParsed(UID);

		if ((data == null)) {
			// parse the submit query result
			result = getSubmitQueryResult(UID);

			if ((result != null) && (result.size() != 0)) {
				data = parseCVSString(result, listAttributes);
				updateSubmitQueryResultParsed(UID, data);
			}
		}

		// Create a sublist and add data to list according
		// to the limit and offset value of the config
		List<Row> sublist = new ArrayList<Row>();
		BasePagingLoadResult loadResult = null;

		int start = config.getOffset();
		int limit = data.size();

		if (config.getLimit() > 0) {
			limit = Math.min(start + config.getLimit(), limit);
		}

		int totalNumber = data.size();
		sublist = new ArrayList<Row>(data.subList(start, limit));
		loadResult = new BasePagingLoadResult<Row>(sublist, config.getOffset(),
				totalNumber);

		// System.out.println("start: " + start);
		// System.out.println("limit: " + limit);
		// System.out.println("sublist size: " + sublist.size());

		return loadResult;
	}

	// get attributes list for display the result in a table
	private List<String> getListAttributes(String value) {

		List<String> listAttributes = new ArrayList<String>();
		// recover attribute fields for the result table
		String headers = value;
		// logger.info("Headers fields table: " + headers);
		listAttributes = parseAttributesTableResult(headers);
		// logger.info("attributes number: " + listAttributes.size());
		// logger.info("attributes list: ");
		// print check
		// for (int i = 0; i < listAttributes.size(); i++) {
		// logger.info("attribute: " + listAttributes.get(i));
		// }
		return listAttributes;
	}

	private List<String> parseAttributesTableResult(String phrase) {
		String delimiter = ",";
		List<String> elements = new ArrayList<String>();
		int idxdelim = -1;
		phrase = phrase.trim();

		while ((idxdelim = phrase.indexOf(delimiter)) >= 0) {
			elements.add(phrase.substring(0, idxdelim));
			phrase = phrase.substring(idxdelim + 1).trim();
		}
		elements.add(phrase);
		return elements;
	}

	// parse a csv row in a list of values
	@Override
	public List<Row> parseCVSString(List<Result> result, List<String> attrNames)
			throws Exception {

		List<Row> rows = new ArrayList<Row>();

		if (result != null) {
			for (int i = 0; i < result.size(); i++) {
				List<String> attrValues = parse(result.get(i).getValue());
				Row element = new Row(attrNames, attrValues, i);
				rows.add(element);
			}
		}
		return rows;
	}

	private List<String> parse(String row) throws Exception {
		String delimiter = ",";

		// print check
		// logger.info("row: " + row);

		List<String> elements = new ArrayList<String>();
		String phrase = row;
		int idxdelim = -1;
		boolean quot = false;
		phrase = phrase.trim();
		while ((idxdelim = phrase.indexOf(delimiter)) >= 0) {
			quot = phrase.startsWith("\"");
			if (quot) {
				phrase = phrase.substring(1);
				String quoted = "";
				if (phrase.startsWith("\""))
					phrase = phrase.substring(1);
				else {
					RE regexp = new RE("[^\\\\]\"");
					boolean matching = regexp.match(phrase);

					if (matching) {
						int i0 = regexp.getParenStart(0);
						quoted = phrase.substring(0, i0 + 1).trim();
						phrase = phrase.substring(i0 + 2).trim();
					}
				}
				if (phrase.startsWith(delimiter))
					phrase = phrase.substring(1);

				elements.add(quoted);

			} else {
				elements.add(phrase.substring(0, idxdelim));
				phrase = phrase.substring(idxdelim + 1).trim();
			}
			// logger.info("server token: " + phrase);
		}
		if (phrase.startsWith("\""))
			phrase = phrase.substring(1);

		if (phrase.endsWith("\""))
			phrase = phrase.substring(0, phrase.length() - 1);

		elements.add(phrase);
		// logger.info("size: " + elements.size());
		return elements;
	}

	private List<String> getDatabaseManagerAlgorithms() {
		ArrayList<String> dbAlg = new ArrayList<String>();
		StatisticalManagerFactory factory = getFactory();
		// get and print algorithms
		SMListGroupedAlgorithms groups = factory.getAlgorithms();

		if (groups == null)
			logger.info("dbmanager-> GROUPS OF ALGORITHMS IS NULL!");
		else
			logger.info("dbmanager-> GROUPS OF ALGORITHMS IS NOT NULL!");

		// get list categories
		for (SMGroupedAlgorithms group : groups.thelist()) {
			for (SMAlgorithm algorithm : group.thelist()) {
				dbAlg.add(algorithm.name());
			}
		}
		return dbAlg;
	}

	private List<Parameter> getParameters(String algorithmId) {
		StatisticalManagerFactory factory = getFactory();
		SMParameters smParams = factory.getAlgorithmParameters(algorithmId);
		List<Parameter> params = new ArrayList<Parameter>();

		for (SMParameter smParam : smParams.list()) {
			SMTypeParameter smType = smParam.type();
			StatisticalServiceType smTypeName = smType.name();

			String paramName = smParam.name();
			String paramDescription = smParam.description();
			String defaultValue = smParam.defaultValue();
			String objectType = smType.values().get(0);

			// print CHECK
			// logger.info("parameters: ");
			// logger.info(paramName);
			// logger.info(paramDescription);
			// logger.info(objectType);
			// logger.info(defaultValue);

			Parameter objectParam = new Parameter(paramName, paramDescription,
					objectType, defaultValue);
			params.add(objectParam);
		}
		return params;
	}

	private synchronized List<Result> getSubmitQueryResult(String submitQueryUID) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, List<Result>> submitQueryResult = (HashMap<String, List<Result>>) session
				.getAttribute("submitQueryResult");
		if (submitQueryResult.containsKey(submitQueryUID)) {
			return submitQueryResult.get(submitQueryUID);
		} else {
			return null;
		}
	}

	private synchronized List<Row> getSubmitQueryResultParsed(
			String submitQueryUID) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, List<Row>> submitQueryResultParsed = (HashMap<String, List<Row>>) session
				.getAttribute("submitQueryResultParsed");

		if (submitQueryResultParsed.containsKey(submitQueryUID)) {
			// System.out.println("ResultParsed: UID contained");
			return submitQueryResultParsed.get(submitQueryUID);
		} else {
			return null;
		}
	}

	private synchronized void updateSubmitQueryResultParsed(
			String submitQueryUID, List<Row> data) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, List<Row>> submitQueryResultParsed = (HashMap<String, List<Row>>) session
				.getAttribute("submitQueryResultParsed");
		// add data
		if (data.size() != 0) {
			submitQueryResultParsed.put(submitQueryUID, data);
			session.setAttribute("submitQueryResultParsed",
					submitQueryResultParsed);
		}
	}

	private synchronized void removeResultParsed(String submitQueryUID) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, List<Row>> submitQueryResultParsed = (HashMap<String, List<Row>>) session
				.getAttribute("submitQueryResultParsed");
		if (submitQueryResultParsed.containsKey(submitQueryUID)) {
			// remove data parsed
			submitQueryResultParsed.remove(submitQueryUID);
			// update
			session.setAttribute("submitQueryResultParsed",
					submitQueryResultParsed);
		}
	}

	private synchronized void updateSubmitQueryResultMap(String submitQueryUID,
			List<Result> result) {
		if (submitQueryUID != null) {
			ASLSession session = WsUtil.getAslSession(this
					.getThreadLocalRequest().getSession());
			HashMap<String, List<Result>> submitQueryResult = (HashMap<String, List<Result>>) session
					.getAttribute("submitQueryResult");
			submitQueryResult.put(submitQueryUID, result);
			session.setAttribute("submitQueryResult", submitQueryResult);
		}
	}

	private synchronized void removeResult(String submitQueryUID) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, List<Result>> submitQueryResult = (HashMap<String, List<Result>>) session
				.getAttribute("submitQueryResult");
		if (submitQueryResult.containsKey(submitQueryUID)) {
			// remove data parsed
			submitQueryResult.remove(submitQueryUID);
			// update
			session.setAttribute("submitQueryResult", submitQueryResult);
		}
	}

	// update job with the related status
	private synchronized void updateJobStatus(String jobID, String status) {
		if (jobID != null) {
			// add the job status
			ASLSession session = WsUtil.getAslSession(this
					.getThreadLocalRequest().getSession());
			HashMap<String, String> JobStatusMap = (HashMap<String, String>) session
					.getAttribute("JobStatusList");
			JobStatusMap.put(jobID, status);
			session.setAttribute("JobStatusList", JobStatusMap);
		}
	}

	// remove job with the related status
	private synchronized void removeJobStatus(String jobID) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, String> JobStatusMap = (HashMap<String, String>) session
				.getAttribute("JobStatusList");
		String status = JobStatusMap.get(jobID);
		if (status != null) {
			JobStatusMap.remove(jobID);
			session.setAttribute("JobStatusList", JobStatusMap);
		}
	}

	// get job status
	private synchronized String getJobStatus(String jobID) {
		ASLSession session = WsUtil.getAslSession(this.getThreadLocalRequest()
				.getSession());
		HashMap<String, String> JobStatusMap = (HashMap<String, String>) session
				.getAttribute("JobStatusList");
		String status = JobStatusMap.get(jobID);
		return status;
	}

	// update job with the computation id
	private synchronized void updateJob(String jobID, String computationId) {
		if (jobID != null) {
			// add the computation in the map
			ASLSession session = WsUtil.getAslSession(this
					.getThreadLocalRequest().getSession());
			HashMap<String, String> computationIDMap = (HashMap<String, String>) session
					.getAttribute("ComputationIDList");
			computationIDMap.put(jobID, computationId);
			session.setAttribute("ComputationIDList", computationIDMap);
		}
	}

	// remove job with the computation id
	private synchronized String removeJob(String jobID) {
		if (jobID != null) {
			// System.out.println("remove jobID " + job);
			// add the computation in the map
			ASLSession session = WsUtil.getAslSession(this
					.getThreadLocalRequest().getSession());
			HashMap<String, String> computationIDMap = (HashMap<String, String>) session
					.getAttribute("ComputationIDList");
			String computationId = computationIDMap.get(jobID);
			if (computationId != null) {
				computationIDMap.remove(jobID);
				session.setAttribute("ComputationIDList", computationIDMap);
				return computationId;
			}
		}
		return null;
	}

	private synchronized boolean checkJob(String jobID) {
		boolean isContained = false;
		if (jobID != null) {
			ASLSession session = WsUtil.getAslSession(this
					.getThreadLocalRequest().getSession());
			HashMap<String, String> computationIDMap = (HashMap<String, String>) session
					.getAttribute("ComputationIDList");
			if (computationIDMap.containsKey(jobID)) {
				isContained = true;
			} else {
				isContained = false;
			}
		}
		// System.out.println("JobID isContained: " + isContained);
		return isContained;
	}

	private String startComputation(String algorithmName,
			List<Parameter> parameters, ComputationOutput outputData)
			throws Exception {
		return startComputation(algorithmName, parameters, outputData, null);
	}

	private String startComputation(String algorithmName,
			List<Parameter> parameters, ComputationOutput outputData,
			String jobID) throws Exception {

		SMComputationConfig config = new SMComputationConfig();
		SMInputEntry[] list = new SMInputEntry[parameters.size()];
		int i = 0;

		for (Parameter p : parameters)
			list[i++] = new SMInputEntry(p.getName(), p.getValue());
		config.parameters(new SMEntries(list));
		config.algorithm(algorithmName);

		// create a computation request
		SMComputationRequest request = new SMComputationRequest();
		request.user(getUsername());
		request.config(config);

		try {
			StatisticalManagerFactory factory = getFactory();
			String computationId = factory.executeComputation(request);

			float percentage = 0;
			String scope = getScope();
			String username = getUsername();

			updateJobStatus(jobID, "computation started");
			updateJob(jobID, computationId);
			logger.info("dbmanager-> startComputation: the computation has started!");
			while (percentage < 100) {
				percentage = checkComputationStatus(scope, computationId,
						username, outputData);
				Thread.sleep(3000);
			}
			logger.info("dbmanager-> startComputation: the computation has finished!");
			updateJobStatus(jobID, "computation finished");
			// removeJob(jobID);

			return computationId;
		} catch (Exception e) {
			logger.info("dbmanager-> startComputation: the job submit has failed!");
			// e.printStackTrace();
			throw e;
		}
	}

	private float checkComputationStatus(String scope, String computationId,
			String user, ComputationOutput outputData) throws Exception {
		// System.out.println("checkComputation " + computationId);
		ScopeProvider.instance.set(scope);

		StatisticalManagerFactory factory = StatisticalManagerDSL
				.createStateful().build();
		SMComputation computation = factory.getComputation(computationId);
		SMOperationStatus status = SMOperationStatus.values()[computation
				.operationStatus()];

		float percentage = 0;
		if (status == SMOperationStatus.RUNNING) {
			// logger.info("RUNNING");
			SMOperationInfo infos = factory.getComputationInfo(computationId,
					user);
			// percentage = Float.parseFloat(infos.percentage());
			// logger.info("Percentage:" +
			// percentage);
			// computation = factory.getComputation(computationId);
			status = SMOperationStatus.values()[computation.operationStatus()];
		} else if ((status == SMOperationStatus.COMPLETED)
				|| (status == SMOperationStatus.FAILED)) {
			// logger.info("computation COMPLETED");
			// logger.info("COMPLETED OR FAILED");
			SMAbstractResource abstractResource = computation
					.abstractResource();
			SMResource smResource = abstractResource.resource();
			int resourceTypeIndex = smResource.resourceType();
			SMResourceType smResType = SMResourceType.values()[resourceTypeIndex];

			displayOutput(smResource, smResType, outputData);

			// print check
			// logger.info("SM resource Name: " + smResource.name());
			// logger.info("SM resource Name: " + smResource.name());
			// logger.info("SM resource ID: " + smResource.resourceId());
			// logger.info("SM resource ID: " + smResource.resourceId());
			// logger.info("SM resource Description: " +
			// smResource.description());
			percentage = 100;
		}
		return percentage;
	}

	private void displayOutput(SMResource smResource, SMResourceType smResType,
			ComputationOutput outputData) throws Exception {

		if (smResType.equals(SMResourceType.OBJECT)) {
			// switch (smResType) {
			// case FILE:
			// SMFile fileRes = (SMFile) smResource;
			// System.out.println("Output is a file");
			// break;
			// case OBJECT:
			SMObject objRes = (SMObject) smResource;
			if (objRes.name().contentEquals(PrimitiveTypes.MAP.toString())) {
				logger.info("dbmanager-> Output is a map");
				getMap(objRes, outputData);

			} else if (objRes.name().contentEquals(
					PrimitiveTypes.IMAGES.toString())) {
				// logger.info("Output are images");
			}
			// else
			// System.out.println("Output is other");
			// rootLogger.log(Level.SEVERE, "Output is other");
		}

		// EXCEPTION MANAGEMENT
		if (smResType.equals(SMResourceType.ERROR)) {
			Exception e = new Exception(smResource.description());
			// e.printStackTrace();
			logger.error("dbmanager-> " + e);
			throw e;
		}
	}

	// get output result
	private void getMap(SMObject objRes, ComputationOutput outputData)
			throws Exception {
		// output data values
		LinkedHashMap<String, String> mapValues = new LinkedHashMap<String, String>();
		// output data keys
		LinkedHashMap<String, String> mapKeys = new LinkedHashMap<String, String>();

		// logger.info("getStorageInputStream - started");
		InputStream is = getStorageClientInputStream(objRes.url());
		// object serializer
		XStream xstream = new XStream();
		xstream.alias(
				"org.gcube_system.namespaces.data.analysis.statisticalmanager.types.SMObject",
				SMObject.class);
		xstream.alias(
				"org.gcube_system.namespaces.data.analysis.statisticalmanager.types.SMFile",
				SMFile.class);
		xstream.alias(
				"org.gcube_system.namespaces.data.analysis.statisticalmanager.types.SMResource",
				SMResource.class);
		xstream.alias(
				"org.gcube_system.namespaces.data.analysis.statisticalmanager.types.SMTable",
				SMTable.class);
		// logger.info("streaming");

		@SuppressWarnings("unchecked")
		Map<String, SMResource> smMap = (Map<String, SMResource>) (xstream
				.fromXML(is));
		is.close();
		// logger.info("getStorageInputStream - finished");

		// logger.info("build the resultMap - started");
		int i = 0;
		for (String key : smMap.keySet()) {
			// add key value
			mapKeys.put(String.valueOf(i), key);
			SMResource smres = smMap.get(key);
			int resourceTypeIndex = smres.resourceType();
			SMResourceType smsubResType = SMResourceType.values()[resourceTypeIndex];
			// logger.info("ResourceType: " + smsubResType);

			if (smsubResType == SMResourceType.OBJECT) {
				SMObject obje = (SMObject) smres;
				String outstring = obje.url();
				// logger.info("key: " + smsubResType);
				// logger.info("object: " + outstring);
				mapValues.put(String.valueOf(i), outstring);
				i++;
			}
		}
		outputData.setMapValues(mapValues);
		outputData.setmapKeys(mapKeys);
		// logger.info("build the resultMap - finished");
	}

	private InputStream getStorageClientInputStream(String url)
			throws Exception {
		URL u = new URL(null, url, new URLStreamHandler() {
			@Override
			protected URLConnection openConnection(URL u) throws IOException {
				return new SMPURLConnection(u);
			}
		});
		return u.openConnection().getInputStream();
	}

	private StatisticalManagerFactory getFactory() {
		HttpSession httpSession = this.getThreadLocalRequest().getSession();
		return SessionUtil.getFactory(httpSession);
	}

	private String getUsername() {
		HttpSession httpSession = this.getThreadLocalRequest().getSession();
		return SessionUtil.getUsername(httpSession);
	}

	private String getScope() {
		HttpSession httpSession = this.getThreadLocalRequest().getSession();
		return SessionUtil.getScope(httpSession);
	}

	// remove the computation
	public Boolean removeComputation(String uidSubmitQuery) throws Exception {
		// System.out.println("server UID: " + uidSubmitQuery);
		String computationId = null;

		if ((uidSubmitQuery != null) && (!(uidSubmitQuery.equals("")))) {
			// get job status
			// ASLSession session = WsUtil.getAslSession(this
			// .getThreadLocalRequest().getSession());
			// HashMap<String, String> JobStatusMap = (HashMap<String, String>)
			// session
			// .getAttribute("JobStatusList");
			// String status = JobStatusMap.get(uidSubmitQuery);
			String status = getJobStatus(uidSubmitQuery);

			if (status == null) {
				// the computation has not started
				while (computationId == null) {
					computationId = removeJob(uidSubmitQuery);
				}
			} else if (status.equals("computation started")) {
				// System.out.println("check status: computation started");
				// the computation has started
				computationId = removeJob(uidSubmitQuery);
			}
		}

		if (computationId != null) {
			StatisticalManagerFactory factory = getFactory();
			try {
				factory.removeComputation(computationId);
				// remove submit query result
				refreshDataOnServer(uidSubmitQuery);
				// System.out.println("computation removed");
			} catch (Exception e) {
				e.printStackTrace();

				logger.info("dbmanager-> Could not remove the computation ID "
						+ computationId + " corresponding to jobID "
						+ uidSubmitQuery);
				logger.error("dbmanager-> " + e);
			}
		}
		// remove job status
		removeJobStatus(uidSubmitQuery);
		return (new Boolean(true));
	}

	public void refreshDataOnServer(String submitQueryUID) {
		if ((submitQueryUID != null) && (!submitQueryUID.equals(""))) {
			removeResultParsed(submitQueryUID);
			removeResult(submitQueryUID);
		}
	}

	private synchronized void insertDataIntoCache(net.sf.ehcache.Element data) {
		employeeCache.put(data);
	}

	private synchronized net.sf.ehcache.Element getDataFromCache(String key) {
		net.sf.ehcache.Element data = employeeCache.get(key);
		return data;
	}

	// clear the cache on the user request
	public void refreshDataTree() throws Exception {
		refreshCache();
	}

	private synchronized void refreshCache() throws Exception {
		try {
			employeeCache.removeAll();
		} catch (Exception e) {
			// TODO: handle exception
			throw new Exception("Failure to clear the cache. " + e);
		}
	}

}