public TableKeyFinder(SnapShot _snapshot, byte[] _tableid, byte[] _beginkey, byte[] _endkey)
{
this.snapshot = _snapshot;
this.tableid = _tableid;
this.beginkeyfinal = Helper.CalcKey(_tableid, _beginkey);
this.endkeyfinal = Helper.CalcKey(_tableid, _endkey);
}
public TableIterator(SnapShot snapshot, byte[] _tableid, byte[] _beginkeyfinal, byte[] _endkeyfinal)
{
this.it = snapshot.db.NewIterator(null, snapshot.readop);
this.tableid = _tableid;
this.beginkeyfinal = _beginkeyfinal;
this.endkeyfinal = _endkeyfinal;
//this.Reset();
}
//创建快照
private SnapShot CreateSnapInfo()
{
//看最新高度的快照是否已经产生
var snapshot = new SnapShot(this.dbPtr);
snapshot.Init();
return(snapshot);
}
public WriteBatch(IntPtr dbptr, SnapShot snapshot)
{
this.dbPtr = dbptr;
this.batchptr = RocksDbSharp.Native.Instance.rocksdb_writebatch_create();
//this.batch = new RocksDbSharp.WriteBatch();
this.snapshot = snapshot;
this.cache = new Dictionary <string, byte[]>();
}
public TableIterator(SnapShot snapshot, byte[] _tableid, byte[] _beginkeyfinal, byte[] _endkeyfinal)
{
this.itPtr = RocksDbSharp.Native.Instance.rocksdb_create_iterator(snapshot.dbPtr, snapshot.readopHandle);
//this.it = snapshot.db.NewIterator(null, snapshot.readop);
this.tableid = _tableid;
this.beginkeyfinal = _beginkeyfinal;
this.endkeyfinal = _endkeyfinal;
//this.Reset();
}
//写入操作需要保持线性，线程安全
private void WriteUnsafe(WriteTask task)
{
lock (systemtable_block)
{
using (var wb = new WriteBatch(this.db.Handle, snapshotLast))
{
var heightbuf = BitConverter.GetBytes(snapshotLast.DataHeight);
foreach (var item in task.items)
{
if (item.value != null)
{
DBValue.QuickFixHeight(item.value, heightbuf);
}
switch (item.op)
{
case WriteTaskOP.CreateTable:
wb.CreateTable(item.tableID, item.value);
break;
case WriteTaskOP.DeleteTable:
wb.DeleteTable(item.tableID);
break;
case WriteTaskOP.PutValue:
wb.PutUnsafe(item.tableID, item.key, item.value);
break;
case WriteTaskOP.DeleteValue:
wb.Delete(item.tableID, item.key);
break;
case WriteTaskOP.Log:
break;
}
}
var taskblock = task.ToBytes();
//还要把这个block本身写入，高度写入
var finaldata = DBValue.FromValue(DBValue.Type.Bytes, taskblock).ToBytes();
DBValue.QuickFixHeight(finaldata, heightbuf);
var blockkey = BitConverter.GetBytes(snapshotLast.DataHeight);
wb.PutUnsafe(systemtable_block, blockkey, finaldata);
//wb.Put(systemtable_block, height, taskblock);
//height++
var finalheight = DBValue.FromValue(DBValue.Type.UINT64, (ulong)(snapshotLast.DataHeight + 1)).ToBytes();
DBValue.QuickFixHeight(finalheight, heightbuf);
wb.PutUnsafe(systemtable_info, "_height".ToBytes_UTF8Encode(), finalheight);
RocksDbSharp.Native.Instance.rocksdb_write(this.db.Handle, this.defaultWriteOpPtr, wb.batchptr);
//this.db.Write(wb.batch);
snapshotLast.Dispose();
snapshotLast = CreateSnapInfo();
snapshotLast.AddRef();
}
}
}
//写入操作需要保持线性，线程安全
//writetask 会被修改
//所以要返回一个bytearray 留给外部
private void WriteUnsafe(WriteTask task, Action <WriteTask, byte[], IWriteBatch> afterparser)
{
lock (systemtable_block)
{
using (var wb = new WriteBatch(this.dbPtr, snapshotLast))
{
//先写入原始block
//先抽数据，之后就会改变了
var taskblock = task.ToBytes();
//还要把这个block本身写入，高度写入
var finaldata = DBValue.FromValue(DBValue.Type.Bytes, taskblock);
wb.Put(systemtable_block, snapshotLast.DataHeightBuf, finaldata);
//逐个执行每一个writetask
//var heightbuf = BitConverter.GetBytes(snapshotLast.DataHeight);
foreach (var item in task.items)
{
if (item.value != null)
{
item.value = DBValue.QuickFixHeight(item.value, snapshotLast.DataHeightBuf);
}
switch (item.op)
{
case WriteTaskOP.CreateTable:
wb.CreateTable(item.tableID, item.value);
break;
case WriteTaskOP.DeleteTable:
wb.DeleteTable(item.tableID);
break;
case WriteTaskOP.PutValue:
wb.PutUnsafe(item.tableID, item.key, item.value);
break;
case WriteTaskOP.DeleteValue:
wb.Delete(item.tableID, item.key);
break;
case WriteTaskOP.Log:
break;
}
}
//在高度增加之前给一个回调插入处理的时机
if (afterparser != null)
{
afterparser(task, taskblock, wb);
}
//增加高度
//height++
var finalheight = DBValue.FromValue(DBValue.Type.UINT64, (ulong)(snapshotLast.DataHeight + 1));
wb.Put(systemtable_info, "_height".ToBytes_UTF8Encode(), finalheight);
RocksDbSharp.Native.Instance.rocksdb_write(this.dbPtr, this.defaultWriteOpPtr, wb.batchptr);
//this.db.Write(wb.batch);
snapshotLast.Dispose();
snapshotLast = CreateSnapInfo();
snapshotLast.AddRef();
//return finaldata;
}
}
}