// public methods
/// <inheritdoc />
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, BatchableSource <TItem> value)
{
Ensure.IsNotNull(value, nameof(value));
var writer = context.Writer;
while (writer is WrappingBsonWriter)
{
writer = ((WrappingBsonWriter)writer).Wrapped;
}
var binaryWriter = writer as BsonBinaryWriter;
var startPosition = binaryWriter?.Position;
writer.PushSettings(s => { var bs = s as BsonBinaryWriterSettings; if (bs != null)
{
bs.MaxDocumentSize = _maxItemSize;
}
});
writer.PushElementNameValidator(_itemElementNameValidator);
try
{
var batchCount = Math.Min(value.Count, _maxBatchCount);
if (batchCount != value.Count && !value.CanBeSplit)
{
throw new ArgumentException("Batch is too large.");
}
for (var i = 0; i < batchCount; i++)
{
var itemPosition = binaryWriter?.Position;
var item = value.Items[value.Offset + i];
_itemSerializer.Serialize(context, args, item);
var batchSize = binaryWriter?.Position - startPosition;
if (batchSize > _maxBatchSize)
{
if (i > 0 && value.CanBeSplit)
{
binaryWriter.BaseStream.Position = itemPosition.Value; // remove the last item
binaryWriter.BaseStream.SetLength(itemPosition.Value);
value.SetProcessedCount(i);
return;
}
else
{
throw new ArgumentException("Batch is too large.");
}
}
}
value.SetProcessedCount(batchCount);
}
finally
{
writer.PopElementNameValidator();
writer.PopSettings();
}
}
