NextGenPos

Evi Francis Hilde Van RoeyWim Serroyen Ignas Van TrichtDavid Van Effen Liesbeth Vertommen

Inleiding

• Geautomatiseerde applicatie voor kassasysteem

• Aankopen samenstellen• Flexibiliteit• Aanpasbaarheid

Context diagram

Data flow diagram

ERD

Use case

Het programma

Pluggable business rules& Prijsstrategieën

[Serializable] public class DiscountSettings { private IDiscountStrategy[] strategies; private static XmlSerializer serializer;

[XmlIgnore] public IDiscountStrategy[] Strategies { get { return strategies; } set { strategies = value; } }

[XmlElement(Type = typeof(DiscountStrategySerializer))] public DiscountStrategySerializer[] XmlStrategies { get { if (Strategies == null) return null; else { DiscountStrategySerializer[] dss = new DiscountStrategySerializer[Strategies.Length]; for (int i = 0; i < Strategies.Length; i++) { dss[i] = new DiscountStrategySerializer(strategies[i]); } return dss; } }}

public class DiscountStrategySerializer : IXmlSerializable {private IDiscountStrategy strategy;

public DiscountStrategySerializer(IDiscountStrategy strategy) { this.strategy = strategy; }

public void ReadXml(XmlReader reader) { Type type = Type.GetType(reader.GetAttribute("type")); reader.ReadStartElement(); this.strategy = (IDiscountStrategy)new XmlSerializer(type).Deserialize(reader); reader.ReadEndElement(); }

public void WriteXml(XmlWriter writer) { writer.WriteAttributeString("type", strategy.GetType().ToString()); new XmlSerializer(strategy.GetType()).Serialize(writer, strategy); } }

<?xml version="1.0" encoding="utf-8"?><DiscountSettings xmlns:xsi="http://www.w3.org/2001/XMLSchema-

instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <XmlStrategies

type="NextGenPOS.Model.Discounts.ItemPriceDiscountStrategy"> <ItemPriceDiscountStrategy> <Description>Bedrag op product</Description> <Product> <ProductID>4</ProductID> <Description>Chef Antons Cajun Seasoning</Description> <Price>22</Price> </Product> <Amount>100</Amount> <Quantity>100</Quantity> </ItemPriceDiscountStrategy> </XmlStrategies>...

public class RulesFacade { private static RulesFacade instance; private PluggableRules rules;

private RulesFacade() { rules = new PluggableRules().Deserialize(RulesFacade.RulesFile); }

...

public bool IsInvalid(Sale sale) { foreach (PaymentTypeRule ptr in rules.Rules) { if (ptr.PaymentType == sale.PaidBy.Type) return ptr.IsInvalid(sale); } return false;

}...

}

[System.Xml.Serialization.XmlRoot("PluggableRules")] public class PluggableRules { private Rule[] rules;

public PluggableRules(){

rules = new Rule[0];}

[System.Xml.Serialization.XmlArray("Rules"), System.Xml.Serialization.XmlArrayItem(typeof(PaymentTypeRule))]

public Rule[] Rules {

get{return rules;}set{rules = value;}

}

public void addRule(Rule r) {

IList<Rule> ruleList = this.Rules.ToList<Rule>(); ruleList.Add(r); this.Rules = ruleList.ToArray<Rule>();

}

public void Serialize(string path){

XmlSerializer serializer = new XmlSerializer(typeof(PluggableRules));Stream stream = new FileStream(path, FileMode.Create,

FileAccess.Write, FileShare.ReadWrite);serializer.Serialize(stream, this);stream.Close();

}

public PluggableRules Deserialize(string path){

TextReader reader = new StreamReader(path);XmlSerializer serializer = new XmlSerializer(typeof(PluggableRules));

PluggableRules myRules = (PluggableRules)serializer.Deserialize(reader);reader.Close();return myRules;

}

<?xml version="1.0"?><PluggableRules xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <Rules> <PaymentTypeRule type="NextGenPOS.Model.Rules.PaymentTypeRule"> <MinAmount>0</MinAmount> <MaxAmount>5000</MaxAmount> <PaymentType>Cash</PaymentType> </PaymentTypeRule> <PaymentTypeRule type="NextGenPOS.Model.Rules.PaymentTypeRule"> <MinAmount>15</MinAmount> <MaxAmount>10000</MaxAmount> <PaymentType>DirectDebit</PaymentType> </PaymentTypeRule> <PaymentTypeRule type="NextGenPOS.Model.Rules.PaymentTypeRule"> <MinAmount>50</MinAmount> <MaxAmount>25000</MaxAmount> <PaymentType>CreditCard</PaymentType> </PaymentTypeRule> </Rules></PluggableRules>

ServiceFactorypublic class ServiceFactory{ private Hashtable services = new Hashtable(); public ServiceFactory() { Add<IAccountingAdapter>(new AccountingAdapter(new

AccountingSystemTest())); Add<IInventoryAdapter>(new InventoryAdapter(new

InventorySystemTest())); }

public void Add<T>(T t) where T : IService { services.Add(typeof(T), t); }

public T GetService<T>() { return (T)services[typeof(T)]; }}

ServiceFactorypublic interface IService{}

public interface IAccountingAdapter : IService{ /// <summary> /// Verwerkt de boekhoudkundige gegevens voor een sale /// </summary> /// <param name="s"></param> void ReportSale(Sale s); }

Model

Database• Controller

public Controller(){ string connectionString = server=(local)\\SQLEXPRESS; “ + “database=NEXTGENPOS.MDF;Integrated Security=SSPI"; mySqlConnection = new SqlConnection(connectionString);}// dynamische query opbouwerprivate DataSet genericSelectQueryFunction(string selectString, string returnSetName){ if (selectString.Equals("") || returnSetName.Equals("")) { return new DataSet(); } SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); mySqlCommand.CommandText = selectString; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet(); mySqlConnection.Open(); mySqlDataAdapter.Fill(myDataSet, returnSetName); mySqlConnection.Close(); return myDataSet;}

public DataSet getProductByName(string name){ string selectString = "select * from product where

description like” + '%" + name + "%'"; return genericSelectQueryFunction(selectString,

"product");}

public void saleTransaction(int customerId, DateTime saleDateTime, bool complete, double amount, int paymentTypeId, int[,] productIdQuantity) { try { mySqlConnection.Open(); } catch (Exception ex) { Console.WriteLine(ex.Message); } SqlTransaction transaction = null; SqlCommand command = new SqlCommand(); int saleId = 0; try { string insertSaleQueryString = "insert into sale (customer_id,date,complete)

values ( “ + customerId + ", '" + saleDateTime + "', '" + complete + "')" + "; select id from sale where id= @@IDENTITY"; transaction = mySqlConnection.BeginTransaction(); command.Connection = mySqlConnection; command.CommandText = insertSaleQueryString; command.Transaction = transaction; saleId = (int)command.ExecuteScalar(); catch (Exception ex) { Console.WriteLine(ex.Message); if (transaction != null) { Console.WriteLine("Transactie rollback"); transaction.Rollback(); } } mySqlConnection.Close(); }

• Datafacade

public static DatabaseFacade Instance{ get { if (null == instance) instance = new DatabaseFacade(); return instance; }}

public IList<Employee> getAllEmployees(){ IList<Employee> eList = new List<Employee>(); DataSet employees = control.getAllEmployees(); DataTable myDataTable = employees.Tables["employee"]; foreach (DataRow row in myDataTable.Rows) { Employee emp = new Employee(); emp.EmployeeID = int.Parse(row["id"].ToString()); emp.FirstName = row["firstname"].ToString(); emp.LastName = row["lastname"].ToString(); emp.UserName = row["username"].ToString(); emp.IsManager = row["function_id"].

ToString().TrimEnd().Equals("2"); eList.Add(emp); } return eList;}

public Customer getCustomerById(int id){ DataSet customerDataSet = control.getCustomerById(id); DataTable myDataTable = customerDataSet.Tables["customer"]; if (myDataTable.Rows.Count == 0) { throw new CustomerNotFoundException("Geen klant

gevonden met id " + id); } DataRow temp = myDataTable.Rows[0]; return new Customer(int.Parse(temp["id"].ToString()),

temp["name"].ToString(), temp["address"].ToString(), temp["city"].ToString(), System.DateTime.Parse(temp["dob"].ToString());}

• Stored procedure

Kortingen - Strategy

Adapters

• Voorraadbeheersysteem

interface IInventoryAdapter{ bool IsInStock(Product p); //is het item in voorraad? int GetNumberInStock(Product p); //aantal items in voorraad void UpdateStock(Sale s); //werk de stock bij met de

//items in de sale}

public int GetNumberInStock(Product p){ if (p.Description.Equals("Tofu") ||

p.Description.Equals("Konbu")) return 0; return 9999999;}

• Boekhoudsysteem

public interface IAccountingAdapter{ /// Verwerkt de boekhoudkundige gegevens voor een sale void ReportSale(Sale s); }

public class AccountingSystemTest{ public void UpdateSales(Sale s) { Console.WriteLine("Sale:{0}", s.ToString()); } public void UpdateCommissions(Sale s) { }}

• Authorization service

public interface ICreditAuthorizationAdapter { bool isAuthorized(string cardNumber,

string customername, double amount); }

public class CreditCardAuthorizationServiceTest { public bool isAuthorized(string cardnumber,

string customername, double amount) { if ((customername.Equals("Antonio Moreno") ||

customername.Equals("Yang Wang")) && amount > 0) return false; else if ((customername.Equals("Maria Anders") || customername.Equals("Thomas Hardy"))

&& amount > 1000) return false; return true; } }

Logger

• Design Patterns:• Chain of Responsibility pattern

• Verschillende niveaus (debug/info/fatal) • verschillende outputs (console/file/email)

• Observer pattern• Event logging

• Observer

• IObservable

public interface IObserver { void Notify(object anObject); }

public interface IObservable { void Register(IObserver anObserver); void UnRegister(IObserver anObserver); }}

public class ObservableImpl:IObservable { protected Hashtable _observerContainer=new Hashtable(); public void Register(IObserver anObserver){ _observerContainer.Add(anObserver,anObserver); } public void UnRegister(IObserver anObserver){ _observerContainer.Remove(anObserver); } public void NotifyObservers(object anObject) { foreach(IObserver anObserver in _observerContainer.Keys) { anObserver.Notify(anObject); } } }}

• Voorbeeld

public IList<SalesLineItem> ItemsPurchased { get { return itemsPurchased; } set { base.NotifyObservers(itemsPurchased); itemsPurchased = value; } }

• Chain op responsibility

public enum LoggerState { FATAL = 1, //Fatale error --> hoogste niveau: stuur een email naar de persoon die verantwoordelijke is EXCEPT = 3, //Zware fout --> Exceptions ERROR = 5, EMAIL = 6, // versturen van een email INFO = 7, //Notice (opmerking) : schrijf naar een logbestand OBSERVER = 8, //observer logging DEBUG = 10 //Debugging boodschap: schrijf enkel naar de console }Elk type heeft een waarde (=prioriteit of mask):

protected ILogger next;

public ILogger setNext(ILogger l) { next = l; return l; }

protected static ILogger l, l3; protected static OBserverLogger l2; static LogManager() { l = new ConsoleLogger(LoggerState.DEBUG); l3 = l.setNext(new LogFileLogger

(LoggerState.INFO,"./logs/logFileInfo")); l2 = new OBserverLogger

(LoggerState.OBSERVER, "./logs/logFileObserver"); }

public void Message(String msg, LoggerState priority) { if (priority <= mask) { WriteMessage(msg); } if (next != null) { next.Message(msg, priority); } } abstract protected void WriteMessage(String msg);

view

• Model-view-controller

New POSForm()• een lijst van de klanten opgehaald • een lijst binnengehaald met de gekende

producten • user met succes is geauthenticeerd, zal er

worden nagegaan of deze user admin rechten heeft.

Hoe vullen we een component ‘combobox’ met de lijst van onze klanten?

• we hebben een klasse Bind• de properties id en name • de methode override String ToString()

• Sequence diagram

• de lijst met klanten, verkregen door de DatabaseFacade

• omzetten van customer lijst naar een lijst van Bind objecten

• lijst van bind objecten wordt aan een BindingSource gelinked.

Sale ticket• een ticket geeft een overzicht van sale• de producten, subtotalen, kortingen op

producten, globale kortingen• de velden die in een ticket zijn instelbaar,

doormiddel van een XML config bestand• Vb. item in xml:

• Sequence diagram: de communicatie tussen het POSForm en de controller, die uiteindelijk met het model Register communiceert

Sequence diagram: • de communicatie

bij aanmaak van een ticket.

• Een ticket wordt ingesteld wanneer de methode setFlatList (de lijst van flatLineItems) of setFlatTotal (een flatLineItem) worden aan-geroepen.