private IReadOnlyList <IAsyncCursor <TDocument> > CreateCursors(IChannelSourceHandle channelSource, BsonDocument command, BsonDocument result)
{
var cursors = new List <AsyncCursor <TDocument> >();
foreach (var cursorDocument in result["cursors"].AsBsonArray.Select(v => v["cursor"].AsBsonDocument))
{
var cursorId = cursorDocument["id"].ToInt64();
var firstBatch = cursorDocument["firstBatch"].AsBsonArray.Select(v =>
{
var bsonDocument = (BsonDocument)v;
using (var reader = new BsonDocumentReader(bsonDocument))
{
var context = BsonDeserializationContext.CreateRoot(reader);
var document = _serializer.Deserialize(context);
return(document);
}
})
.ToList();
var cursor = new AsyncCursor <TDocument>(
channelSource.Fork(),
_collectionNamespace,
command,
firstBatch,
cursorId,
_batchSize ?? 0,
0, // limit
_serializer,
_messageEncoderSettings);
cursors.Add(cursor);
}
return(cursors);
}
private async Task <IAsyncCursor <BsonDocument> > ExecuteUsingCommandAsync(IChannelSourceHandle channelSource, ReadPreference readPreference, CancellationToken cancellationToken)
{
var databaseNamespace = _collectionNamespace.DatabaseNamespace;
var command = new BsonDocument("listIndexes", _collectionNamespace.CollectionName);
var operation = new ReadCommandOperation <BsonDocument>(databaseNamespace, command, BsonDocumentSerializer.Instance, _messageEncoderSettings);
try
{
var response = await operation.ExecuteAsync(channelSource, readPreference, cancellationToken).ConfigureAwait(false);
var cursorDocument = response["cursor"].AsBsonDocument;
var cursor = new AsyncCursor <BsonDocument>(
channelSource.Fork(),
CollectionNamespace.FromFullName(cursorDocument["ns"].AsString),
command,
cursorDocument["firstBatch"].AsBsonArray.OfType <BsonDocument>().ToList(),
cursorDocument["id"].ToInt64(),
0,
0,
BsonDocumentSerializer.Instance,
_messageEncoderSettings);
return(cursor);
}
catch (MongoCommandException ex)
{
if (ex.Code == 26)
{
return(new SingleBatchAsyncCursor <BsonDocument>(new List <BsonDocument>()));
}
throw;
}
}
/// <summary>
/// Executes a write operation using a channel source.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="operation">The write operation.</param>
/// <param name="channelSource">The channel source.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>A Task whose result is the result of the operation.</returns>
public static async Task <TResult> ExecuteAsync <TResult>(
this IWriteOperation <TResult> operation,
IChannelSourceHandle channelSource,
CancellationToken cancellationToken)
{
Ensure.IsNotNull(operation, "operation");
using (var writeBinding = new ChannelSourceReadWriteBinding(channelSource.Fork(), ReadPreference.Primary))
{
return(await operation.ExecuteAsync(writeBinding, cancellationToken).ConfigureAwait(false));
}
}
/// <summary>
/// Executes a write operation using a channel source.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="operation">The write operation.</param>
/// <param name="channelSource">The channel source.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>The result of the operation.</returns>
public static TResult Execute <TResult>(
this IWriteOperation <TResult> operation,
IChannelSourceHandle channelSource,
CancellationToken cancellationToken)
{
Ensure.IsNotNull(operation, nameof(operation));
using (var writeBinding = new ChannelSourceReadWriteBinding(channelSource.Fork(), ReadPreference.Primary))
{
return(operation.Execute(writeBinding, cancellationToken));
}
}
private AsyncCursor <TResult> CreateCursorFromCursorResult(IChannelSourceHandle channelSource, BsonDocument command, AggregateResult result)
{
return(new AsyncCursor <TResult>(
channelSource.Fork(),
CollectionNamespace,
command,
result.Results,
result.CursorId.GetValueOrDefault(0),
_batchSize ?? 0,
0, // limit
_resultSerializer,
MessageEncoderSettings));
}
/// <summary>
/// Executes a read operation using a channel source.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="operation">The read operation.</param>
/// <param name="channelSource">The channel source.</param>
/// <param name="readPreference">The read preference.</param>
/// <param name="session">The session.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A Task whose result is the result of the operation.
/// </returns>
public static async Task <TResult> ExecuteAsync <TResult>(
this IReadOperation <TResult> operation,
IChannelSourceHandle channelSource,
ReadPreference readPreference,
ICoreSessionHandle session,
CancellationToken cancellationToken)
{
Ensure.IsNotNull(operation, nameof(operation));
using (var readBinding = new ChannelSourceReadWriteBinding(channelSource.Fork(), readPreference, session.Fork()))
{
return(await operation.ExecuteAsync(readBinding, cancellationToken).ConfigureAwait(false));
}
}
/// <summary>
/// Executes a read operation using a channel source.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="operation">The read operation.</param>
/// <param name="channelSource">The channel source.</param>
/// <param name="readPreference">The read preference.</param>
/// <param name="session">The session.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// The result of the operation.
/// </returns>
public static TResult Execute <TResult>(
this IReadOperation <TResult> operation,
IChannelSourceHandle channelSource,
ReadPreference readPreference,
ICoreSessionHandle session,
CancellationToken cancellationToken)
{
Ensure.IsNotNull(operation, nameof(operation));
using (var readBinding = new ChannelSourceReadWriteBinding(channelSource.Fork(), readPreference, session.Fork()))
{
return(operation.Execute(readBinding, cancellationToken));
}
}
// private methods
private IAsyncCursor <TDocument> CreateCursor(IChannelSourceHandle channelSource, BsonDocument query, CursorBatch <TDocument> batch)
{
return(new AsyncCursor <TDocument>(
channelSource.Fork(),
_collectionNamespace,
query,
batch.Documents,
batch.CursorId,
_batchSize,
_limit < 0 ? Math.Abs(_limit.Value) : _limit,
_resultSerializer,
_messageEncoderSettings));
}
private AsyncCursor <TDocument> CreateCursor(IChannelSourceHandle channelSource, CursorBatch <TDocument> batch, bool slaveOk)
{
return(new AsyncCursor <TDocument>(
channelSource.Fork(),
_collectionNamespace,
_filter ?? new BsonDocument(),
batch.Documents,
batch.CursorId,
_batchSize,
_limit < 0 ? Math.Abs(_limit.Value) : _limit,
_resultSerializer,
_messageEncoderSettings,
null)); // maxTime
}
private IAsyncCursor <BsonDocument> CreateCursor(IChannelSourceHandle channelSource, BsonDocument result, BsonDocument command)
{
var cursorDocument = result["cursor"].AsBsonDocument;
var cursor = new AsyncCursor <BsonDocument>(
channelSource.Fork(),
CollectionNamespace.FromFullName(cursorDocument["ns"].AsString),
command,
cursorDocument["firstBatch"].AsBsonArray.OfType <BsonDocument>().ToList(),
cursorDocument["id"].ToInt64(),
0,
0,
BsonDocumentSerializer.Instance,
_messageEncoderSettings);
return(cursor);
}
private async Task <IAsyncCursor <BsonDocument> > ExecuteUsingCommandAsync(IChannelSourceHandle channelSource, ReadPreference readPreference, CancellationToken cancellationToken)
{
var command = new BsonDocument
{
{ "listCollections", 1 },
{ "filter", _filter, _filter != null }
};
var operation = new ReadCommandOperation <BsonDocument>(_databaseNamespace, command, BsonDocumentSerializer.Instance, _messageEncoderSettings);
var response = await operation.ExecuteAsync(channelSource, readPreference, cancellationToken).ConfigureAwait(false);
var cursorDocument = response["cursor"].AsBsonDocument;
var cursor = new AsyncCursor <BsonDocument>(
channelSource.Fork(),
CollectionNamespace.FromFullName(cursorDocument["ns"].AsString),
command,
cursorDocument["firstBatch"].AsBsonArray.OfType <BsonDocument>().ToList(),
cursorDocument["id"].ToInt64(),
0,
0,
BsonDocumentSerializer.Instance,
_messageEncoderSettings);
return(cursor);
}
private IChannelSourceHandle GetChannelSourceHelper()
{
return(_channelSource.Fork());
}
// methods
/// <inheritdoc/>
public Task <IChannelSourceHandle> GetReadChannelSourceAsync(CancellationToken cancellationToken)
{
ThrowIfDisposed();
return(Task.FromResult(_channelSource.Fork()));
}