/// <summary>
/// Performs a best efforts recovery of orphaned transactions.
/// </summary>
private void Recover()
{
var orphans = log.GetOrphanTransactions();
var context = new UpdateContext(this, true, false, false, Guid.Empty);
IOperation operation;
SysLog.LogWarning("Recovering [{0}] transactions for [{1}].", orphans.Count, resource.Name);
Trace(0, "Begin Recovery", null);
resource.BeginRecovery(context);
for (int i = 0; i < orphans.Count; i++)
{
IOperationLog opLog = log.OpenOperationLog(orphans[i]);
context.TransactionID = opLog.TransactionID;
if (opLog.Mode == OperationLogMode.Redo)
{
if (resource.BeginRedo(context))
{
foreach (ILogPosition pos in opLog.GetPositions(false))
{
operation = opLog.Read(resource, pos);
Trace(0, "Redo: " + operation.Description, "ID=" + context.TransactionID.ToString());
resource.Redo(context, operation);
}
}
resource.EndRedo(context);
}
else
{
if (resource.BeginUndo(context))
{
foreach (ILogPosition pos in opLog.GetPositions(true))
{
operation = opLog.Read(resource, pos);
Trace(0, "Undo: " + operation.Description, "ID=" + context.TransactionID.ToString());
resource.Undo(context, opLog.Read(resource, pos));
}
}
resource.EndUndo(context);
}
log.CloseOperationLog(opLog);
}
context.TransactionID = Guid.Empty;
resource.EndRecovery(context);
Trace(0, "End Recovery", null);
}
/// <summary>
/// Commits the current transaction. If this is the base transaction then
/// the operation will be commited to the <see cref="ITransactedResource" />.
/// </summary>
/// <exception cref="TransactionException">Thrown if the stack is empty.</exception>
internal void Commit()
{
Transaction transaction;
using (TimedLock.Lock(syncLock))
{
if (base.Count == 0)
{
throw new TransactionException(EmptyMsg);
}
transaction = base.Pop();
if (base.Count == 0)
{
manager.Trace(0, "Begin commit BASE", "ID=" + id.ToString());
// We're committing the base transaction so play the redo log
// to the resource and then delete the log when we're finished.
ITransactedResource resource = manager.Resource;
UpdateContext context = new UpdateContext(manager, false, true, false, ID);
List <ILogPosition> positions;
positions = operationLog.GetPositions(false);
if (resource.BeginRedo(context))
{
for (int i = 0; i < positions.Count; i++)
{
var operation = operationLog.Read(manager.Resource, positions[i]);
manager.Trace(0, "Redo: " + operation.Description, "ID=" + id.ToString());
resource.Redo(context, operation);
}
}
resource.EndRedo(context);
manager.EndTransaction(this);
manager.Trace(0, "End commit BASE", "ID=" + id.ToString());
}
else
{
manager.Trace(0, string.Format("Commit NESTED [{0}]", base.Count), "ID=" + id.ToString());
}
}
}
// GET api/operations
public IEnumerable <Operation> Get(int position, int count)
{
CheckState();
return(operationLog.Read(position, count));
}
