private async Task <IEnumerable <T> > ReadBufferedAsync <T>(int index, Func <IDataReader, object> deserializer, Identity typedIdentity)
{
try
{
var reader = (DbDataReader)this.reader;
var buffer = new List <T>();
while (index == gridIndex && await reader.ReadAsync(cancel).ConfigureAwait(false))
{
buffer.Add((T)deserializer(reader));
}
return(buffer);
}
finally // finally so that First etc progresses things even when multiple rows
{
if (index == gridIndex)
{
await NextResultAsync().ConfigureAwait(false);
}
}
}
internal GridReader(IDbCommand command, IDataReader reader, Identity identity, DynamicParameters dynamicParams, bool addToCache, CancellationToken cancel)
: this(command, reader, identity, dynamicParams, addToCache)
{
this.cancel = cancel;
}
private static async Task <int> ExecuteMultiImplAsync(IDbConnection cnn, CommandDefinition command, IEnumerable multiExec)
{
bool isFirst = true;
int total = 0;
bool wasClosed = cnn.State == ConnectionState.Closed;
try
{
if (wasClosed)
{
await((DbConnection)cnn).OpenAsync(command.CancellationToken).ConfigureAwait(false);
}
CacheInfo info = null;
string masterSql = null;
if ((command.Flags & CommandFlags.Pipelined) != 0)
{
const int MAX_PENDING = 100;
var pending = new Queue <AsyncExecState>(MAX_PENDING);
DbCommand cmd = null;
try
{
foreach (var obj in multiExec)
{
if (isFirst)
{
isFirst = false;
cmd = (DbCommand)command.SetupCommand(cnn, null);
masterSql = cmd.CommandText;
var identity = new Identity(command.CommandText, cmd.CommandType, cnn, null, obj.GetType(), null);
info = GetCacheInfo(identity, obj, command.AddToCache);
}
else if (pending.Count >= MAX_PENDING)
{
var recycled = pending.Dequeue();
total += await recycled.Task.ConfigureAwait(false);
cmd = recycled.Command;
cmd.CommandText = masterSql; // because we do magic replaces on "in" etc
cmd.Parameters.Clear(); // current code is Add-tastic
}
else
{
cmd = (DbCommand)command.SetupCommand(cnn, null);
}
info.ParamReader(cmd, obj);
var task = cmd.ExecuteNonQueryAsync(command.CancellationToken);
pending.Enqueue(new AsyncExecState(cmd, task));
cmd = null; // note the using in the finally: this avoids a double-dispose
}
while (pending.Count != 0)
{
var pair = pending.Dequeue();
using (pair.Command) { } // dispose commands
total += await pair.Task.ConfigureAwait(false);
}
} finally
{
// this only has interesting work to do if there are failures
using (cmd) { } // dispose commands
while (pending.Count != 0)
{ // dispose tasks even in failure
using (pending.Dequeue().Command) { } // dispose commands
}
}
}
else
{
using (var cmd = (DbCommand)command.SetupCommand(cnn, null))
{
foreach (var obj in multiExec)
{
if (isFirst)
{
masterSql = cmd.CommandText;
isFirst = false;
var identity = new Identity(command.CommandText, cmd.CommandType, cnn, null, obj.GetType(), null);
info = GetCacheInfo(identity, obj, command.AddToCache);
}
else
{
cmd.CommandText = masterSql; // because we do magic replaces on "in" etc
cmd.Parameters.Clear(); // current code is Add-tastic
}
info.ParamReader(cmd, obj);
total += await cmd.ExecuteNonQueryAsync(command.CancellationToken).ConfigureAwait(false);
}
}
}
command.OnCompleted();
}
finally
{
if (wasClosed)
{
cnn.Close();
}
}
return(total);
}
private static async Task <IEnumerable <T> > QueryAsync <T>(this IDbConnection cnn, Type effectiveType, CommandDefinition command)
{
object param = command.Parameters;
var identity = new Identity(command.CommandText, command.CommandType, cnn, effectiveType, param == null ? null : param.GetType(), null);
var info = GetCacheInfo(identity, param, command.AddToCache);
bool wasClosed = cnn.State == ConnectionState.Closed;
var cancel = command.CancellationToken;
using (var cmd = (DbCommand)command.SetupCommand(cnn, info.ParamReader))
{
DbDataReader reader = null;
try
{
if (wasClosed)
{
await((DbConnection)cnn).OpenAsync(cancel).ConfigureAwait(false);
}
reader = await cmd.ExecuteReaderAsync(wasClosed?CommandBehavior.CloseConnection | CommandBehavior.SequentialAccess : CommandBehavior.SequentialAccess, cancel).ConfigureAwait(false);
var tuple = info.Deserializer;
int hash = GetColumnHash(reader);
if (tuple.Func == null || tuple.Hash != hash)
{
tuple = info.Deserializer = new DeserializerState(hash, GetDeserializer(effectiveType, reader, 0, -1, false));
if (command.AddToCache)
{
SetQueryCache(identity, info);
}
}
var func = tuple.Func;
if (command.Buffered)
{
List <T> buffer = new List <T>();
while (await reader.ReadAsync(cancel).ConfigureAwait(false))
{
buffer.Add((T)func(reader));
}
while (await reader.NextResultAsync().ConfigureAwait(false))
{
}
command.OnCompleted();
return(buffer);
}
else
{
// can't use ReadAsync / cancellation; but this will have to do
wasClosed = false; // don't close if handing back an open reader; rely on the command-behavior
var deferred = ExecuteReaderSync <T>(reader, func, command.Parameters);
reader = null; // to prevent it being disposed before the caller gets to see it
return(deferred);
}
}
finally
{
using (reader) { } // dispose if non-null
if (wasClosed)
{
cnn.Close();
}
}
}
}
private IEnumerable <T> ReadDeferred <T>(int index, Func <IDataReader, object> deserializer, Identity typedIdentity)
{
try
{
while (index == gridIndex && reader.Read())
{
yield return((T)deserializer(reader));
}
}
finally // finally so that First etc progresses things even when multiple rows
{
if (index == gridIndex)
{
NextResult();
}
}
}
