/// <summary>
/// Creates distributed pointer
/// </summary>
public Piled(int pileId, PilePointer ptr)
{
PileID = pileId;
Pointer = ptr;
m_ValueLoaded = false;
m_Value = default(T);
}
public unsafe override void WritePilePointer(int addr, PilePointer ptr)
{
byte *bptr = null;
m_View.SafeMemoryMappedViewHandle.AcquirePointer(ref bptr);
try
{
bptr += addr;
*bptr++ = (byte)(ptr.NodeID >> 24);
*bptr++ = (byte)(ptr.NodeID >> 16);
*bptr++ = (byte)(ptr.NodeID >> 8);
*bptr++ = (byte)(ptr.NodeID);
*bptr++ = (byte)(ptr.Segment >> 24);
*bptr++ = (byte)(ptr.Segment >> 16);
*bptr++ = (byte)(ptr.Segment >> 8);
*bptr++ = (byte)(ptr.Segment);
*bptr++ = (byte)(ptr.Address >> 24);
*bptr++ = (byte)(ptr.Address >> 16);
*bptr++ = (byte)(ptr.Address >> 8);
*bptr = (byte)(ptr.Address);
}
finally
{
m_View.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
private bool crawlSegment(_segment seg)//must be called under segment read lock
{
const int BUFFER_SIZE = 1024;
var addr = 0;//start crawling from very first byte to avoid segment corruption as previous address may have been deleted
while (addr < seg.Data.Length - CHUNK_HDER_SZ)
{
var add = addr >= m_Address;
var chunkStartAdr = addr;
var flag = seg.Data.ReadChunkFlag(addr);
if (flag == ChunkFlag.Wrong) //todo In future corruption recovery attempt may take place if we scan form 8-aligned block
{
throw new PileException(StringConsts.PILE_CRAWL_INTERNAL_SEGMENT_CORRUPTION_ERROR.Args(addr));
}
addr += 3;
var payloadSize = seg.Data.ReadInt32(addr); addr += 4;
var sver = seg.Data.ReadByte(addr); addr++; //read serializer version
addr += payloadSize; //skip the body of payload
if (!add)
{
continue;
}
m_Address = addr;//next chunk
if (flag == ChunkFlag.Used)
{
var ptr = new PilePointer(m_SegmentIdx, chunkStartAdr);
var dt = sver == SVER_UTF8 ? PileEntry.DataType.String :
sver == SVER_BUFF ? PileEntry.DataType.Buffer :
sver == SVER_LINK ? PileEntry.DataType.Link : PileEntry.DataType.Object;
var entry = new PileEntry(ptr, dt, payloadSize);
m_Buffer.Add(entry);
if (m_Buffer.Count == BUFFER_SIZE)
{
return(m_Address >= seg.Data.Length - CHUNK_HDER_SZ);
}
}
}//while
return(true);
}
public override void WritePilePointer(int addr, PilePointer ptr)
{
m_Data.WriteBEInt32(addr, ptr.NodeID); addr += 4;
m_Data.WriteBEInt32(addr, ptr.Segment); addr += 4;
m_Data.WriteBEInt32(addr, ptr.Address);
}
public abstract void WritePilePointer(int addr, PilePointer ptr);