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ImportViewModelBase.cs
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ImportViewModelBase.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using Elect.DomainObjects;
using Elect.Loader.Common;
namespace Elect.Loader
{
public enum UnknownRegionActions
{
Create,
Ignore,
Stop
}
public enum UnknownComissionActions
{
Create,
Ignore,
Stop
}
public abstract class ImportViewModelBase: NotifyPropertyChangedBase
{
private readonly ILogger m_logger;
private bool m_isLoading;
private UnknownRegionActions m_unknownRegionAction;
private UnknownComissionActions m_unknownComissionAction;
protected ImportViewModelBase(ILogger logger)
{
m_logger = logger;
StopCommand = new DelegateCommand(onStop);
}
public ICommand StopCommand { get; set; }
public Repository Repository { get; set; }
/// <summary>
/// Any long running process
/// </summary>
protected Task TaskLoading;
protected CancellationTokenSource Tcs;
/// <summary>
/// Any (first) exception which was occured inside TaskLoading's action.
/// </summary>
internal Exception LastError;
public Boolean IsLoading
{
get { return m_isLoading; }
set
{
m_isLoading = value;
raisePropertyChangedEvent("IsLoading");
raisePropertyChangedEvent("IsNotBusy");
}
}
public Boolean IsNotBusy
{
get { return !IsLoading; }
}
private void onStop()
{
if (TaskLoading == null)
return;
log("Cancelling");
TaskLoading.ContinueWith(
t =>
{
if (t.Exception != null)
log("Canceled with error: " + t.Exception.GetBaseException().Message);
else
log("Canceled");
});
Tcs.Cancel();
}
/// <summary>
/// What to do in case we encounter not existed region.
/// </summary>
public UnknownRegionActions UnknownRegionAction
{
get { return m_unknownRegionAction; }
set
{
m_unknownRegionAction = value;
raisePropertyChangedEvent("UnknownRegionAction");
}
}
/// <summary>
/// What to do in case we encounter not existed comission.
/// </summary>
public UnknownComissionActions UnknownComissionAction
{
get { return m_unknownComissionAction; }
set
{
m_unknownComissionAction = value;
raisePropertyChangedEvent("UnknownComissionAction");
}
}
#region Logging
protected void logError(string msg)
{
m_logger.LogError(msg);
}
protected void logWarning(string msg)
{
m_logger.LogWarning(msg);
}
protected void log(string msg)
{
m_logger.Log(msg);
}
protected ILogger Logger
{
get { return m_logger; }
}
#endregion
protected Poll ensurePollCreated()
{
var poll = new Poll
{
Name =
"Âûáîðû äåïóòàòîâ Ãîñóäàðñòâåííîé Äóìû Ôåäåðàëüíîãî Ñîáðàíèÿ Ðîññèéñêîé Ôåäåðàöèè øåñòîãî ñîçûâà",
};
poll.Candidates = new List<Candidate>
{
new Candidate {Name = "Ñïðàâåäëèâàÿ Ðîññèÿ", Poll = poll},
new Candidate {Name = "ËÄÏÐ", Poll = poll},
new Candidate {Name = "Ïàòðèîòû Ðîññèè", Poll = poll},
new Candidate {Name = "ÊÏÐÔ", Poll = poll},
new Candidate {Name = "ßÁËÎÊÎ", Poll = poll},
new Candidate {Name = "Åäèíàÿ Ðîññèÿ", Poll = poll},
new Candidate {Name = "Ïðàâîå äåëî", Poll = poll}
};
Repository.EnsurePollExists(poll);
return poll;
}
protected void loadProtocols(IProtocolLoader loader, ResultProvider provider, bool isNewProvider)
{
try
{
IEnumerable<PollProtocol> results = loader.LoadProtocols(Repository);
int countTotal = 0;
int countNew = 0;
int countUpdated = 0;
foreach (PollProtocol protocol in results)
{
if (Tcs.IsCancellationRequested)
return;
Debug.Assert(protocol.Region != null);
protocol.Provider = provider;
saveProtocol(protocol, isNewProvider, ref countTotal, ref countNew, ref countUpdated);
}
log(String.Format("All protocols loaded. Total: {0}, new: {1}, updated: {2}", countTotal, countNew, countUpdated));
}
finally
{
loader.Dispose();
}
}
protected void saveProtocol(PollProtocol protocol, bool isNewProvider, ref int countTotal, ref int countNew, ref int countUpdated)
{
PollProtocol existingProtocol = null;
bool needSave = true;
if (!isNewProvider)
{
existingProtocol = Repository.LoadProtocol(protocol);
}
if (existingProtocol != null)
{
needSave = !existingProtocol.EqualsTo(protocol);
if (needSave)
countUpdated++;
protocol.Id = existingProtocol.Id;
}
else
countNew++;
if (needSave)
{
Repository.SaveProtocol(protocol,
new ProtocolSaveOption
{
UnknownRegionAction = UnknownRegionAction,
UnknownComissionAction = UnknownComissionAction,
DownloadNotifier = new DownloadNotifier(Logger),
CancellationToken = Tcs.Token
});
log(string.Format("#{0} protocol saved. Region: {1}, comission: {2}. Images: {3}",
countTotal, protocol.Region.Name, protocol.Comission, protocol.Images.Count));
}
else
{
log(string.Format("#{0} protocol skipped. Region: {1}, comission: {2}. Images: {3}",
countTotal, protocol.Region.Name, protocol.Comission, protocol.Images.Count));
}
countTotal++;
}
protected void tearDown(Task t)
{
IsLoading = false;
try
{
LastError = t.Exception != null ? t.Exception.InnerException : null;
if (t.Exception != null)
{
var originalEx = t.Exception.GetBaseException();
if (!(originalEx is OperationCanceledException))
log(originalEx.ToString());
}
}
catch (Exception ex)
{
// we don't want an unobserved task exception so swallow the exception
try
{
logError("Error in tear down logic: " + ex);
}
catch(Exception ex2)
{
Trace.WriteLine(ex2.ToString());
}
}
}
}
}