private IndexTablePage QueueExtractFirst()
{
if (this.m_queueFirstPage == null)
{
return(null);
}
IndexTablePage queueFirstPage = this.m_queueFirstPage;
this.m_queueFirstPage = queueFirstPage.NextPage;
queueFirstPage.NextPage = null;
if (this.m_queueFirstPage == null)
{
this.m_queueLastPage = null;
}
else
{
this.m_queueFirstPage.PreviousPage = null;
}
return(queueFirstPage);
}
private IndexTablePage GetPage(long id)
{
int num = this.CalcPageNum(id);
IndexTablePage indexTablePage = null;
if (!this.m_pageCache.TryGetValue(num, out indexTablePage))
{
if (this.m_pageCache.Count == this.m_cacheSize)
{
if (this.m_stream == null)
{
this.m_stream = this.m_streamCreator.OpenStream();
this.m_streamCreator = null;
if (!this.m_stream.CanSeek || !this.m_stream.CanRead || !this.m_stream.CanWrite)
{
Global.Tracer.Assert(false, "Must be able to Seek, Read, and Write stream");
}
}
indexTablePage = this.QueueExtractFirst();
int pageNumber = indexTablePage.PageNumber;
this.m_pageCache.Remove(pageNumber);
if (indexTablePage.Dirty)
{
long offset = this.CalcPageOffset(pageNumber);
this.m_stream.Seek(offset, SeekOrigin.Begin);
indexTablePage.Write(this.m_stream);
}
long offset2 = this.CalcPageOffset(num);
this.m_stream.Seek(offset2, SeekOrigin.Begin);
indexTablePage.Read(this.m_stream);
}
else
{
indexTablePage = new IndexTablePage(this.m_pageSize);
}
indexTablePage.PageNumber = num;
this.m_pageCache[num] = indexTablePage;
this.QueueAppendPage(indexTablePage);
}
return(indexTablePage);
}
public long Retrieve(ReferenceID id)
{
IndexTablePage page = this.GetPage(id.Value);
return(this.ReadValue(id.Value, page));
}
public void Update(ReferenceID id, long value)
{
IndexTablePage page = this.GetPage(id.Value);
this.WriteValue(id.Value, page, value);
}