public StructReadResult <T> ReadStruct <T>(string treeName, Slice key, StructureSchema <T> schema, WriteBatch writeBatch = null)
{
Tree tree = null;
if (writeBatch != null && writeBatch.IsEmpty == false)
{
WriteBatch.InBatchValue result;
if (writeBatch.TryGetValue(treeName, key, out result))
{
if (!result.Version.HasValue)
{
tree = GetTree(treeName);
}
switch (result.OperationType)
{
case WriteBatch.BatchOperationType.AddStruct:
return(new StructReadResult <T>(new StructureReader <T>((Structure <T>)result.Struct, schema), result.Version.HasValue ? (ushort)(result.Version.Value + 1) : tree.ReadVersion(key)));
case WriteBatch.BatchOperationType.Delete:
return(null);
}
}
}
if (tree == null)
{
tree = GetTree(treeName);
}
return(tree.ReadStruct(key, schema));
}
public bool Contains(string treeName, Slice key, out ushort?version, WriteBatch writeBatch = null)
{
if (writeBatch != null && writeBatch.IsEmpty == false)
{
WriteBatch.InBatchValue result;
if (writeBatch.TryGetValue(treeName, key, out result))
{
version = result.Version;
switch (result.OperationType)
{
case WriteBatch.BatchOperationType.Add:
return(true);
case WriteBatch.BatchOperationType.AddStruct:
return(true);
case WriteBatch.BatchOperationType.Delete:
return(false);
default:
throw new ArgumentOutOfRangeException(result.OperationType.ToString());
}
}
}
var tree = GetTree(treeName);
var readVersion = tree.ReadVersion(key);
var exists = readVersion > 0;
version = exists ? (ushort?)readVersion : null;
return(exists);
}
public ReadResult Read(string treeName, Slice key, WriteBatch writeBatch = null)
{
Tree tree = null;
if (writeBatch != null && writeBatch.IsEmpty == false)
{
WriteBatch.InBatchValue result;
if (writeBatch.TryGetValue(treeName, key, out result))
{
if (!result.Version.HasValue)
{
tree = GetTree(treeName);
}
switch (result.OperationType)
{
case WriteBatch.BatchOperationType.Add:
{
var reader = new ValueReader(result.Stream);
return(new ReadResult(reader, result.Version.HasValue ? (ushort)(result.Version.Value + 1) : tree.ReadVersion(key)));
}
case WriteBatch.BatchOperationType.Delete:
return(null);
}
}
}
if (tree == null)
{
tree = GetTree(treeName);
}
return(tree.Read(key));
}
public bool Contains(string treeName, Slice key, out ushort?version, WriteBatch writeBatch = null)
{
if (writeBatch != null)
{
WriteBatch.BatchOperationType operationType;
Stream stream;
if (writeBatch.TryGetValue(treeName, key, out stream, out version, out operationType))
{
switch (operationType)
{
case WriteBatch.BatchOperationType.Add:
return(true);
case WriteBatch.BatchOperationType.Delete:
return(false);
default:
throw new ArgumentOutOfRangeException(operationType.ToString());
}
}
}
var tree = GetTree(treeName);
var readVersion = tree.ReadVersion(Transaction, key);
var exists = readVersion > 0;
version = exists ? (ushort?)readVersion : null;
return(exists);
}
public ushort ReadVersion(string treeName, Slice key, WriteBatch writeBatch = null)
{
if (_disposed)
{
throw new ObjectDisposedException("SnapshotReader");
}
if (writeBatch != null)
{
WriteBatch.InBatchValue result;
if (writeBatch.TryGetValue(treeName, key, out result) && result.Version.HasValue)
{
switch (result.OperationType)
{
case WriteBatch.BatchOperationType.Add:
case WriteBatch.BatchOperationType.AddStruct:
case WriteBatch.BatchOperationType.Delete:
return((ushort)(result.Version.Value + 1));
}
}
}
var tree = GetTree(treeName);
return(tree.ReadVersion(key));
}
public ushort ReadVersion(string treeName, Slice key, WriteBatch writeBatch = null)
{
if (writeBatch != null)
{
WriteBatch.BatchOperationType operationType;
Stream stream;
ushort?version;
if (writeBatch.TryGetValue(treeName, key, out stream, out version, out operationType) && version.HasValue)
{
switch (operationType)
{
case WriteBatch.BatchOperationType.Add:
case WriteBatch.BatchOperationType.Delete:
return((ushort)(version.Value + 1));
}
}
}
var tree = GetTree(treeName);
return(tree.ReadVersion(Transaction, key));
}
public ReadResult Read(string treeName, Slice key, WriteBatch writeBatch = null)
{
Tree tree = null;
if (writeBatch != null)
{
WriteBatch.BatchOperationType operationType;
Stream stream;
ushort?version;
if (writeBatch.TryGetValue(treeName, key, out stream, out version, out operationType))
{
if (!version.HasValue)
{
tree = GetTree(treeName);
}
switch (operationType)
{
case WriteBatch.BatchOperationType.Add:
{
var reader = new ValueReader(stream);
return(new ReadResult(reader, version.HasValue ? (ushort)(version.Value + 1) : tree.ReadVersion(Transaction, key)));
}
case WriteBatch.BatchOperationType.Delete:
return(null);
}
}
}
if (tree == null)
{
tree = GetTree(treeName);
}
return(tree.Read(Transaction, key));
}
