internal void SetHolderForNewRecord(Core.RecordHolder value)
{
System.Diagnostics.Debug.Assert(mmHolder == null, "mHolder can only be set once");
#if DUMP_FINALIZE
System.Diagnostics.Trace.WriteLine(this.GetType().Name + " #" + value.mRecordNo);
#endif
mmHolder = value;
}
/// <summary>
/// Note that this method is called from flush and from the record destructor in the garbage collector thread.
/// </summary>
/// <param name="recordHolder"></param>
internal void InternalFillWriteBuffer(RecordHolder recordHolder, Record record)
{
Debug.Assert(record != null, "InternalFillWriteBuffer : record must be not null.");
var newBuffer = new Byte[mRecordWidth];
if (OnFillWriteBuffer(record, newBuffer))
{
recordHolder.SetNewBuffer(newBuffer);
}
}
private void SetLastUsed(LinkedListNode <RecordHolder> linkListNode)
{
if (linkListNode.List == mRecordsByLastUsed)
{
if (linkListNode != mRecordsByLastUsed.Last)
{
mRecordsByLastUsed.Remove(linkListNode);
mRecordsByLastUsed.AddLast(linkListNode);
}
}
else
{
mRecordsByLastUsed.AddLast(linkListNode);
}
// for every table we use PERCENT_CACHED_RECORDS
int limit = (int)(PERCENT_CACHED_RECORDS * mRecordCount);
if (limit < MIN_CACHED_RECORDS)
{
limit = MIN_CACHED_RECORDS;
}
else if (limit > MAX_CACHED_RECORDS)
{
limit = MAX_CACHED_RECORDS;
}
var node = mRecordsByLastUsed.First;
while (node != null && mRecordsByLastUsed.Count > limit)
{
RecordHolder recordHolder = node.Value;
var nextNode = node.Next;
node.Value.Hold = false;
mRecordsByLastUsed.Remove(node);
#if DUMP_FINALIZE
System.Diagnostics.Trace.WriteLine(this.mOriginalFile + " Remove last used Record #" + recordHolder.mRecordNo);
#endif
node = nextNode;
}
}
internal void EmptyTable()
{
var node = mRecordsByLastUsed.First;
while (node != null && mRecordsByLastUsed.Count > 0)
{
RecordHolder recordHolder = node.Value;
var nextNode = node.Next;
recordHolder.Save();
node = nextNode;
}
#if DUMP_FINALIZE
System.Diagnostics.Trace.WriteLine(this.mOriginalFile + " Clear Records");
#endif
mRecordsByRecordNo.Clear();
mRecordsByLastUsed.Clear();
mRecordCount = 0;
mStream.SetLength(mHeaderWidth);
}
public virtual object NewRecord()
{
var recordNo = mRecordCount;
mRecordCount += 1;
var result = OnCreateNewRecord(/*isnew*/ true, recordNo);
var holder = new RecordHolder(this, recordNo, result);
var linkedListNode = new LinkedListNode <RecordHolder>(holder);
result.SetHolderForNewRecord(holder);
mRecordsByRecordNo[recordNo] = linkedListNode;
SetLastUsed(linkedListNode);
#if DUMP_FINALIZE
System.Diagnostics.Trace.WriteLine(this.mOriginalFile + " Add Record #" + recordNo);
#endif
return(result);
}
internal virtual protected Record InternalGetRecord(UInt32 recordNo, bool returnNullIfNotInCache)
{
Debug.Assert(recordNo < UInt32.MaxValue, "Invalid RecordNo");
LinkedListNode <RecordHolder> linkListNode = null;
RecordHolder holder = null;
Record record = null;
if (mRecordsByRecordNo.TryGetValue(recordNo, out linkListNode))
{
holder = linkListNode.Value;
record = holder.Record;
if (record != null)
{
SetLastUsed(linkListNode);
return(record);
}
else
{
// we're going to add a new one in one sec
RemoveLastUsed(linkListNode);
}
}
if (returnNullIfNotInCache)
{
return(null);
}
// we're here because the record was disposed or never created
var newRecord = OnCreateNewRecord(/*isnew*/ false, recordNo);
if (holder == null)
{
holder = new RecordHolder(this, recordNo, newRecord);
linkListNode = new LinkedListNode <RecordHolder>(holder);
SetLastUsed(linkListNode);
mRecordsByRecordNo[recordNo] = linkListNode;
#if DUMP_FINALIZE
System.Diagnostics.Trace.WriteLine(this.mOriginalFile + " Save Record #" + recordNo);
#endif
}
else
{
// holder exist but object doesn't we expect that a finalized happened
if (holder.RecordFinalized.WaitOne(10000))
{
// we (re)connect the recordHolder to the new Record
holder.RecordFinalized.Reset();
holder.Record = newRecord;
}
else
{
throw new Exception("Something very wrong happened.");
}
}
newRecord.SetHolderForNewRecord(holder);
Byte[] sourceBuffer = holder.GetCurrentBuffer(/*readIfNeeded*/ true);
OnReadRecordBuffer(sourceBuffer, newRecord);
return(newRecord);
}
