private Task <BsonDocument> ExplainAggregateAsync <TResult>(AggregateModel <TResult> model, ExplainVerbosity verbosity, TimeSpan?timeout, CancellationToken cancellationToken)
{
var pipeline = model.Pipeline.Select(x => ConvertToBsonDocument(x)).ToList();
var aggregateOperation = CreateAggregateOperation <TResult>(model, pipeline);
var explainOperation = aggregateOperation.ToExplainOperation(verbosity.ToCore());
return(ExecuteReadOperation(explainOperation, timeout, cancellationToken));
}
public async Task AggregateAsync_should_execute_the_AggregateToCollectionOperation_and_the_FindOperation_when_out_is_specified()
{
var pipeline = new object[] { BsonDocument.Parse("{$match: {x: 2}}"), BsonDocument.Parse("{$out: \"funny\"}") };
var model = new AggregateModel <BsonDocument>(pipeline)
{
AllowDiskUse = true,
BatchSize = 10,
MaxTime = TimeSpan.FromSeconds(3),
UseCursor = false
};
var result = await _subject.AggregateAsync(model, Timeout.InfiniteTimeSpan, CancellationToken.None);
_operationExecutor.QueuedCallCount.Should().Be(1);
var writeCall = _operationExecutor.GetWriteCall <BsonDocument>();
writeCall.Operation.Should().BeOfType <AggregateToCollectionOperation>();
var writeOperation = (AggregateToCollectionOperation)writeCall.Operation;
writeOperation.CollectionNamespace.FullName.Should().Be("foo.bar");
writeOperation.AllowDiskUse.Should().Be(model.AllowDiskUse);
writeOperation.MaxTime.Should().Be(model.MaxTime);
writeOperation.Pipeline.Should().BeEquivalentTo(pipeline);
var fakeCursor = Substitute.For <IAsyncCursor <BsonDocument> >();
_operationExecutor.EnqueueResult(fakeCursor);
// this causes execution of the find operation
await result.GetAsyncEnumerator().MoveNextAsync();
var call = _operationExecutor.GetReadCall <IAsyncCursor <BsonDocument> >();
call.Operation.Should().BeOfType <FindOperation <BsonDocument> >();
var operation = (FindOperation <BsonDocument>)call.Operation;
operation.CollectionNamespace.FullName.Should().Be("foo.funny");
operation.AwaitData.Should().BeTrue();
operation.BatchSize.Should().Be(model.BatchSize);
operation.Comment.Should().BeNull();
operation.Criteria.Should().BeNull();
operation.Limit.Should().Be(null);
operation.MaxTime.Should().Be(model.MaxTime);
operation.Modifiers.Should().BeNull();
operation.NoCursorTimeout.Should().BeFalse();
operation.Partial.Should().BeFalse();
operation.Projection.Should().BeNull();
operation.Skip.Should().Be(null);
operation.Sort.Should().BeNull();
operation.Tailable.Should().BeFalse();
}
private AggregateOperation <TResult> CreateAggregateOperation <TResult>(AggregateModel <TResult> model, List <BsonDocument> pipeline)
{
var resultSerializer = model.ResultSerializer ?? _settings.SerializerRegistry.GetSerializer <TResult>();
return(new AggregateOperation <TResult>(
_collectionNamespace,
pipeline,
resultSerializer,
_messageEncoderSettings)
{
AllowDiskUse = model.AllowDiskUse,
BatchSize = model.BatchSize,
MaxTime = model.MaxTime,
UseCursor = model.UseCursor
});
}
// methods
public async Task <IAsyncEnumerable <TResult> > AggregateAsync <TResult>(AggregateModel <TResult> model, TimeSpan?timeout, CancellationToken cancellationToken)
{
Ensure.IsNotNull(model, "model");
var pipeline = model.Pipeline.Select(x => ConvertToBsonDocument(x)).ToList();
var last = pipeline.LastOrDefault();
if (last != null && last.GetElement(0).Name == "$out")
{
var operation = new AggregateToCollectionOperation(
_collectionNamespace,
pipeline,
_messageEncoderSettings)
{
AllowDiskUse = model.AllowDiskUse,
MaxTime = model.MaxTime
};
await ExecuteWriteOperation(operation, timeout, cancellationToken);
var outputCollectionName = last.GetElement(0).Value.AsString;
var findOperation = new FindOperation <TResult>(
new CollectionNamespace(_collectionNamespace.DatabaseNamespace, outputCollectionName),
model.ResultSerializer ?? _settings.SerializerRegistry.GetSerializer <TResult>(),
_messageEncoderSettings)
{
BatchSize = model.BatchSize,
MaxTime = model.MaxTime
};
return(await Task.FromResult <IAsyncEnumerable <TResult> >(new AsyncCursorAsyncEnumerable <TResult>(
() => ExecuteReadOperation(findOperation, timeout, cancellationToken),
null)));
}
else
{
var operation = CreateAggregateOperation <TResult>(model, pipeline);
return(await Task.FromResult <IAsyncEnumerable <TResult> >(new AsyncCursorAsyncEnumerable <TResult>(
() => ExecuteReadOperation(operation, timeout, cancellationToken),
null)));
}
}
public async Task ExplainAsync_for_aggregate_should_execute_an_AggregateExplainOperation()
{
var pipeline = new[] { BsonDocument.Parse("{ $skip: 10 }") };
var aggregateModel = new AggregateModel <BsonDocument>(pipeline);
var model = new ExplainModel(aggregateModel)
{
Verbosity = ExplainVerbosity.ExecutionStats
};
await _subject.ExplainAsync(model, Timeout.InfiniteTimeSpan, CancellationToken.None);
var call = _operationExecutor.GetReadCall <BsonDocument>();
call.Operation.Should().BeOfType <AggregateExplainOperation>();
var operation = (AggregateExplainOperation)call.Operation;
operation.CollectionNamespace.FullName.Should().Be("foo.bar");
operation.Pipeline.Should().BeEquivalentTo(pipeline);
operation.AllowDiskUse.Should().Be(aggregateModel.AllowDiskUse);
operation.MaxTime.Should().Be(aggregateModel.MaxTime);
}
public async Task AggregateAsync_should_execute_the_AggregateOperation_when_out_is_not_specified()
{
var pipeline = new object[] { BsonDocument.Parse("{$match: {x: 2}}") };
var model = new AggregateModel <BsonDocument>(pipeline)
{
AllowDiskUse = true,
BatchSize = 10,
MaxTime = TimeSpan.FromSeconds(3),
UseCursor = false
};
var fakeCursor = NSubstitute.Substitute.For <IAsyncCursor <BsonDocument> >();
_operationExecutor.EnqueueResult(fakeCursor);
var result = await _subject.AggregateAsync(model, Timeout.InfiniteTimeSpan, CancellationToken.None);
// we haven't executed the operation yet.
_operationExecutor.QueuedCallCount.Should().Be(0);
// this causes execution of the operation
await result.GetAsyncEnumerator().MoveNextAsync();
var call = _operationExecutor.GetReadCall <IAsyncCursor <BsonDocument> >();
call.Operation.Should().BeOfType <AggregateOperation <BsonDocument> >();
var operation = (AggregateOperation <BsonDocument>)call.Operation;
operation.CollectionNamespace.FullName.Should().Be("foo.bar");
operation.AllowDiskUse.Should().Be(model.AllowDiskUse);
operation.BatchSize.Should().Be(model.BatchSize);
operation.MaxTime.Should().Be(model.MaxTime);
operation.UseCursor.Should().Be(model.UseCursor);
operation.Pipeline.Should().ContainInOrder(pipeline);
}