/// <inheritdoc />
public virtual Task <IAsyncCursor <TResult> > WatchAsync <TResult>(
PipelineDefinition <ChangeStreamDocument <BsonDocument>, TResult> pipeline,
ChangeStreamOptions options = null,
CancellationToken cancellationToken = default(CancellationToken))
{
return(wrapped.WatchAsync(pipeline, options, cancellationToken));
}
public Task <IChangeStreamCursor <TResult> > WatchAsync <TResult>(
PipelineDefinition <ChangeStreamDocument <BsonDocument>, TResult> pipeline,
ChangeStreamOptions?options = null,
CancellationToken cancellationToken = default)
{
if (TryGetSession(out IClientSessionHandle? session))
{
return(_client.WatchAsync(session, pipeline, options, cancellationToken));
}
return(_client.WatchAsync(pipeline, options, cancellationToken));
}
/// <summary>
/// Watches changes on all collections in all databases.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="options">The options.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A change stream.
/// </returns>
public static Task <IChangeStreamCursor <ChangeStreamDocument <BsonDocument> > > WatchAsync(
this IMongoClient client,
ChangeStreamOptions options = null,
CancellationToken cancellationToken = default(CancellationToken))
{
Ensure.IsNotNull(client, nameof(client));
var emptyPipeline = new EmptyPipelineDefinition <ChangeStreamDocument <BsonDocument> >();
return(client.WatchAsync(emptyPipeline, options, cancellationToken));
}
private IAsyncCursor <ChangeStreamDocument <BsonDocument> > Watch(IMongoClient client, BsonDocument test, bool async)
{
var target = test["target"].AsString;
var stages = test["changeStreamPipeline"].AsBsonArray.Cast <BsonDocument>();
var pipeline = new BsonDocumentStagePipelineDefinition <ChangeStreamDocument <BsonDocument>, ChangeStreamDocument <BsonDocument> >(stages);
var options = ParseChangeStreamOptions(test["changeStreamOptions"].AsBsonDocument);
if (target == "client")
{
if (async)
{
return(client.WatchAsync(pipeline, options).GetAwaiter().GetResult());
}
else
{
return(client.Watch(pipeline, options));
}
}
var database = client.GetDatabase(_databaseName);
if (target == "database")
{
if (async)
{
return(database.WatchAsync(pipeline, options).GetAwaiter().GetResult());
}
else
{
return(database.Watch(pipeline, options));
}
}
var collection = database.GetCollection <BsonDocument>(_collectionName);
if (target == "collection")
{
if (async)
{
return(collection.WatchAsync(pipeline, options).GetAwaiter().GetResult());
}
else
{
return(collection.Watch(pipeline, options));
}
}
throw new FormatException($"Invalid target: \"{target}\".");
}
public async Task <OperationResult> ExecuteAsync(CancellationToken cancellationToken)
{
try
{
var cursor = await _client.WatchAsync(_pipeline, _options, cancellationToken);
var changeStream = cursor.ToEnumerable().GetEnumerator();
return(OperationResult.FromChangeStream(changeStream));
}
catch (Exception exception)
{
return(OperationResult.FromException(exception));
}
}
