private void CloseMapFile()
{
if (Mmf == null)
{
Trace.TraceWarning("Mmf is null in CloseMapFile");
return;
}
Mmf.Dispose();
Mmf = null;
}
/// <summary>
/// Grow the array to support more data
/// </summary>
/// <param name="requiredMinCapacity">The size to grow from</param>
public void EnsureCapacity(long requiredMinCapacity)
{
Trace.Assert(requiredMinCapacity > 0); // catch int overflow if there is more than one fixed in Backing constructor
if (Capacity >= requiredMinCapacity)
{
return;
}
FileMutex.WaitOne();
try {
switch (PersistenceMode)
{
case PersistenceMode.Persist:
case PersistenceMode.TemporaryPersist:
var oldSize = Capacity;
var newCapacity = (long)(oldSize * ((100F + _GROW_PERCENTAGE) / 100F));
Capacity = newCapacity < requiredMinCapacity
? requiredMinCapacity
: newCapacity;
CloseMapFile();
Trace.Assert(Mmf == null);
Mmf = CreateOrOpenFile(_fileName, Capacity, PersistenceMode, FileMutex, true);
// recreate views so that unsafe r/w on already created wrap do not throw
foreach (var viewWrap in _vw.Values)
{
viewWrap._va.Dispose();
viewWrap._va = Mmf.CreateViewAccessor();
}
break;
case PersistenceMode.Ephemeral:
throw new NotSupportedException("In-memory MMFs do not support resizing. Set initial capacity large enough, only actually used memory will be consumed from RAM");
default:
throw new ArgumentOutOfRangeException();
}
} finally {
FileMutex.ReleaseMutex();
}
}
