/
DualSagaPersister.cs
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/
DualSagaPersister.cs
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using System;
using System.Collections.Generic;
using Rebus;
namespace HermaFx.Rebus
{
public class DualSagaPersister : IStoreSagaData
{
private const string SAGA_PERSISTER_IMPL = nameof(DualSagaPersister) + ":PersisterImpl:";
private IStoreSagaData _oldSagaPersister;
private IStoreSagaData _newSagaPersister;
public DualSagaPersister(IStoreSagaData oldSagaPersister, IStoreSagaData newSagaPersister)
{
_oldSagaPersister = oldSagaPersister;
_newSagaPersister = newSagaPersister;
}
public void Insert(ISagaData sagaData, string[] sagaDataPropertyPathsToIndex)
{
// New insertions will always be persisted under the new IStoreSagaData
_newSagaPersister.Insert(sagaData, sagaDataPropertyPathsToIndex);
}
public void Update(ISagaData sagaData, string[] sagaDataPropertyPathsToIndex)
{
if (!MessageContext.HasCurrent)
{
throw new InvalidOperationException("Rebus MessageContext has no Current context, DualSagaPersister can't update the saga");
}
GetStoreSagaDataImplementation(
(bool)MessageContext.GetCurrent().Items[SAGA_PERSISTER_IMPL + sagaData.GetType().FullName])
.Update(sagaData, sagaDataPropertyPathsToIndex);
}
public void Delete(ISagaData sagaData)
{
if (!MessageContext.HasCurrent)
{
throw new InvalidOperationException("Rebus MessageContext has no Current context, DualSagaPersister can't delete the saga");
}
GetStoreSagaDataImplementation(
(bool)MessageContext.GetCurrent().Items[SAGA_PERSISTER_IMPL + sagaData.GetType().FullName])
.Delete(sagaData);
}
public T Find<T>(string sagaDataPropertyPath, object fieldFromMessage) where T : class, ISagaData
{
if (!MessageContext.HasCurrent)
{
throw new InvalidOperationException("Rebus MessageContext has no Current context, DualSagaPersister can't find the saga");
}
var persisterData = _newSagaPersister.Find<T>(sagaDataPropertyPath, fieldFromMessage);
if (persisterData != null)
{
MessageContext.GetCurrent().Items[SAGA_PERSISTER_IMPL + persisterData.GetType().FullName] = IsNewStoreSagaData(_newSagaPersister);
return persisterData;
}
persisterData = _oldSagaPersister.Find<T>(sagaDataPropertyPath, fieldFromMessage);
if (persisterData != null)
{
MessageContext.GetCurrent().Items[SAGA_PERSISTER_IMPL + persisterData.GetType().FullName] = IsNewStoreSagaData(_oldSagaPersister);
return persisterData;
}
return null;
}
/// <summary>
/// Gets the appropriate IStoreSagaData
/// </summary>
/// <param name="isNewStoreSagaData">True if new IStoreSagaData. False otherwise.</param>
/// <returns>IStoreSagaData instance</returns>
private IStoreSagaData GetStoreSagaDataImplementation(bool isNewStoreSagaData)
{
return isNewStoreSagaData ? _newSagaPersister : _oldSagaPersister;
}
private bool IsNewStoreSagaData(IStoreSagaData sagaPersister)
{
return sagaPersister == _newSagaPersister;
}
}
}