public async ValueTask <bool> MoveNextAsync()
{
Verify.NotDisposed(!this.disposed, this);
// Consume one locally cached value, if we have one.
if (this.localCachedValues.Length > 0)
{
if (this.moveNextCalled)
{
this.localCachedValues.AdvanceTo(this.localCachedValues.AsReadOnlySequence.GetPosition(1));
}
else
{
// Don't consume one the first time we're called if we have an initial set of values.
this.moveNextCalled = true;
return(true);
}
}
this.moveNextCalled = true;
if (this.localCachedValues.Length == 0 && !this.generatorReportsFinished)
{
// Fetch more values
try
{
EnumeratorResults <T> results = await this.owner.jsonRpc.InvokeWithCancellationAsync <EnumeratorResults <T> >(NextMethodName, this.nextOrDisposeArguments, this.cancellationToken).ConfigureAwait(false);
if (!results.Finished && results.Values?.Count == 0)
{
throw new UnexpectedEmptyEnumerableResponseException("The RPC server responded with an empty list of additional values for an incomplete list.");
}
if (results.Values is not null)
{
Write(this.localCachedValues, results.Values);
}
this.generatorReportsFinished = results.Finished;
}
catch (RemoteInvocationException ex)
{
// Avoid spending a message asking the server to dispose of the marshalled enumerator since they threw an exception at us.
this.generatorReportsFinished = true;
if (ex.ErrorCode == (int)JsonRpcErrorCode.NoMarshaledObjectFound)
{
throw new InvalidOperationException(ex.Message, ex);
}
throw;
}
}
return(this.localCachedValues.Length > 0);
}
public async ValueTask <bool> MoveNextAsync()
{
Verify.NotDisposed(!this.disposed, this);
// Consume one locally cached value, if we have one.
if (this.localCachedValues.Length > 0)
{
if (this.moveNextCalled)
{
this.localCachedValues.AdvanceTo(this.localCachedValues.AsReadOnlySequence.GetPosition(1));
}
else
{
// Don't consume one the first time we're called if we have an initial set of values.
this.moveNextCalled = true;
return(true);
}
}
this.moveNextCalled = true;
if (this.localCachedValues.Length == 0 && !this.generatorReportsFinished)
{
// Fetch more values
try
{
EnumeratorResults <T> results = await this.owner.jsonRpc.InvokeWithCancellationAsync <EnumeratorResults <T> >(NextMethodName, this.nextOrDisposeArguments, this.cancellationToken).ConfigureAwait(false);
if (results.Values != null)
{
Write(this.localCachedValues, results.Values);
}
this.generatorReportsFinished = results.Finished;
}
catch (RemoteInvocationException ex) when(ex.ErrorCode == (int)JsonRpcErrorCode.NoMarshaledObjectFound)
{
throw new InvalidOperationException(ex.Message, ex);
}
}
return(this.localCachedValues.Length > 0);
}
