internal void Write(IDataItem dataItem)
{
Check.Require(DesiredFileSize > 0, "Desired file size is invalid");
Check.RequireArgumentNotNull(dataItem, "dataItem");
bool written = false;
// locking to prevent simultaneous flush
// transaction is necessary within Seek, there's no IO outside it
lock (this)
{
// scope which is dummy unless there's client ambient transaction (pending)
using (var scope = _transactionManager.GetLazyTransactionScope())
{
_clearDirtyFlagWhenTransactionCompletes = false;
if (null != _currentAccessor)
{
if (_currentAccessor.ItemCount < this.DesiredFileSize || _currentAccessor.IsTimestampCovered(dataItem.DateTime))
{
written = _currentAccessor.Add(dataItem);
}
}
if (!written)
{
// item goes into another file
// ensure data is stored
CloseAccessor();
Seek(dataItem.DateTime);
// this MUST succeed, checked in postcondition
written = _currentAccessor.Add(dataItem);
}
// it could be false here after flush
_dirty = true;
if (TrackUnsavedItems)
{
_unsavedItems.Add(dataItem);
}
scope.Complete();
} // using (var scope = _transactionManager.GetLazyTransactionScope())
} // lock (this)
Check.Ensure(_dirty && written);
}
