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MarketDataLib/Utility/UpdateManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.IO;
+
+namespace MarketData.Utils
+{
+  public class UpdateManager
+  {
+    private StreamWriter streamWriter=null;
+    private FileStream fileStream=null;
+    private Dictionary<String,String> entries=new Dictionary<String,String>();
+
+    public UpdateManager()
+    {
+    }
+    public bool Prepare(String strPathFileName)
+    {
+      try
+      {
+        String currentWorkingDirectory=Directory.GetCurrentDirectory();
+        if(!File.Exists(strPathFileName)||IsExpired(strPathFileName))
+        {
+          if(File.Exists(strPathFileName))File.Delete(strPathFileName);
+          fileStream=new FileStream(strPathFileName,FileMode.Create);
+          streamWriter=new StreamWriter(fileStream);
+          Console.WriteLine(String.Format("Creating session file:{0}",strPathFileName));
+        }
+        else
+        {
+          FileStream fileStream=new FileStream(strPathFileName,FileMode.Open);
+          StreamReader streamReader=new StreamReader(fileStream);
+          String strLine=null;
+          while(null!=(strLine=streamReader.ReadLine()))
+          {
+            if(!entries.ContainsKey(strLine))entries.Add(strLine,strLine);
+          }
+          Console.WriteLine(String.Format("Loaded {0} entries from session file:{1}",entries.Count,strPathFileName));
+          streamReader.Close();
+          streamReader.Dispose();
+          fileStream.Close();
+          fileStream.Dispose();
+          fileStream=new FileStream(strPathFileName,FileMode.Append);
+          streamWriter=new StreamWriter(fileStream);
+        }
+        return true;
+      }
+      catch(Exception exception)
+      {
+        Console.WriteLine(String.Format("Exception:{0}",exception));
+        return false;
+      }
+    }
+    private bool IsExpired(String strPathFileName)
+    {
+      try
+      {
+        DateGenerator dateGenerator=new DateGenerator();
+        DateTime creationTime=File.GetCreationTime(strPathFileName);
+        int daysElapsed=Math.Abs(dateGenerator.DaysBetweenActual(creationTime,DateTime.Now));
+        if(daysElapsed>5)
+        {
+          Console.WriteLine(String.Format("{0} is expired. {1} days old.",strPathFileName,daysElapsed));
+          return true;
+        }
+        return false;
+      }
+      catch(Exception exception)
+      {
+        Console.WriteLine(String.Format("Exception:{0}",exception));
+        return true;
+      }
+    }
+    public List<String> Entries
+    {
+      get{return new List<String>(entries.Keys);}
+    }
+    public void Add(String entry)
+    {
+      if(null==streamWriter)return;
+      streamWriter.WriteLine(entry);
+      streamWriter.Flush();
+    }
+    public void Dispose()
+    {
+      if(null!=streamWriter){streamWriter.Close();streamWriter.Dispose();}
+      if(null!=fileStream){fileStream.Close();fileStream.Dispose();}
+    }
+  }
+}
+