private unsafe void WriteReadIndexByScanRes(BinSerializer bs)
{
bs.Write(Data1.ToInt64()); //error code
bs.Write(Data3.ToInt64()); //length
if (Data1 == IntPtr.Zero && Data2 != IntPtr.Zero) //不要判断length，可能包含其他如skipped数据
{
int dataSize = 4; //初始化4字节for skipped
int length = Data3.ToInt32();
//先计算并写入数据部分大小，方便子进程分配内存(另考虑子进程内使用ByteBuffer缓存分块)
IteratorKV kv = new IteratorKV();
IntPtr kvPtr = new IntPtr(&kv);
for (int i = 0; i < length; i++) //TODO:底层Api实现一次调用计算出总大小
{
NativeApi.ScanResponseGetKV(Data2, i, kvPtr);
dataSize += 4 + kv.KeySize.ToInt32() + 4 + kv.ValueSize.ToInt32();
}
bs.Write(dataSize);
//再写入skipped
uint skipped = NativeApi.ScanResponseGetSkipped(Data2);
var span = new ReadOnlySpan <byte>(&skipped, 4);
bs.Stream.Write(span);
//最后写入记录数据
int tempSize = 0;
for (int i = 0; i < length; i++)
{
NativeApi.ScanResponseGetKV(Data2, i, kvPtr);
tempSize = kv.KeySize.ToInt32();
span = new ReadOnlySpan <byte>(&tempSize, 4);
bs.Stream.Write(span);
span = new ReadOnlySpan <byte>(kv.KeyPtr.ToPointer(), tempSize);
bs.Stream.Write(span);
tempSize = kv.ValueSize.ToInt32();
span = new ReadOnlySpan <byte>(&tempSize, 4);
bs.Stream.Write(span);
span = new ReadOnlySpan <byte>(kv.ValuePtr.ToPointer(), tempSize);
bs.Stream.Write(span);
}
}
else
{
bs.Write(0); //dataSize
}
}
public void ForEachRow(Action <IntPtr, int, IntPtr, int> action)
{
if (Length <= 0)
{
return;
}
IteratorKV kv = new IteratorKV();
IntPtr kvPtr = IntPtr.Zero;
unsafe
{
kvPtr = new IntPtr(&kv);
}
for (int i = 0; i < Length; i++)
{
NativeApi.ScanResponseGetKV(_handle, i, kvPtr);
action(kv.KeyPtr, kv.KeySize.ToInt32(), kv.ValuePtr, kv.ValueSize.ToInt32());
}
}