Factory Pattern
Relying on the abstract.
Problem
Cicle c = new Cicle(origin, r);
c.Draw();
public void Main(){
Function(new Circle());
Function(new Square());
}
public void Function(IShape s){
s.Draw();
}
IShape
IShape : Factory
IShape : Factory
Exapmle : Various Database
Application (Employee)
Exapmle : Various Database
Exapmle : Test
Exapmle : Test
Exapmle : Test
public interface Database
{
void Store(string key, string data);
string Retrieve(string key);
}
public class DatabaseImpl : Database
{
public void Store(string key, string data)
{
// Do Real DB connection
}
public string Retrieve(string key)
{
// Do Action
return "someData";
}
}
public class Payroll
{
public Database DB { get; set; }
public void DoSometing()
{
DB.Store("key1", "some data");
var data = DB.Retrieve("key1");
}
}
[TestFixture]
public class PayrollTest : Database
{
private string testVariable = String.Empty;
private Payroll payroll;
public void Store(string key, string data)
{
// Do Test Action
testVariable = data;
}
public string Retrieve(string key)
{
// Do Test Action
return testVariable;
}
[Test]
public void TestReadWrite()
{
payroll = new Payroll();
payroll.DB = this;
payroll.DoSometing();
Assert.AreEqual(testVariable, "some data");
}
}
Exapmle : Test
Exapmle : X-band Data Checker
Exapmle : X-band Data Checker
// Controller
dataProcessingChain = DataProcessingChainFactory.CreateAndReturn(parameters.OperationMode, parameters.DataSource);
dataProcessingChain.SetParameters(parameters, report);
dataProcessingChain.Start();
// Factory
public static class DataProcessingChainFactory
{
public static IDataProcessingChain CreateAndReturn(OperationMode operationMode, DataSource dataSource)
{
IDataProcessingChain selectedChain = null;
if (dataSource == DataSource.SSR)
{
switch (operationMode)
{
case OperationMode.INTIGRETY_CHECK_TF:
selectedChain = new ChainTfIntegrityCheck();
break;
case OperationMode.DUMP_TRANSFERFRAME:
selectedChain = new ChainTfDecryption();
break;
case OperationMode.DUMP_SOURCEPACKET:
selectedChain = new ChainSpDump();
break;
case OperationMode.INTIGRETY_CHECK_SP:
selectedChain = new ChainSpIntegrityCheck();
break;
case OperationMode.RAW_TO_IMAGE:
case OperationMode.SP_TO_IMAGE:
selectedChain = new ChainSpToImage();
break;
case OperationMode.PATTERN_CHECK:
selectedChain = new ChainPatternCheck();
break;
case OperationMode.DUMP_LINEDATA:
selectedChain = new ChainLineDataDump();
break;
}
}
else if (dataSource == DataSource.FPA)
{
switch (operationMode)
{
case OperationMode.RAW_TO_IMAGE:
selectedChain = new ChainFpaImageDump();
break;
case OperationMode.PATTERN_CHECK:
selectedChain = new ChainFpaPatternCheck();
break;
case OperationMode.REAL_TIME_VIEW:
selectedChain = new ChainFpaRealTimeView();
break;
case OperationMode.RAW_FILE_VIEW:
selectedChain = new ChainFpaDumpView();
break;
}
}
return selectedChain;
}
}
Adventage
-
Relying on the abstract.
-
replaceable object
Cost
-
Complicated
End.
Factory Pattern
By Jeong Keun Park
Factory Pattern
- 125