public async Task ScaleRecommendation_PendingOrchestrationStarts()
{
// Block the orchestration dispatch loop so that we can queue orchestrations without running them
this.testService.OrchestrationServiceMock.Setup(
svc => svc.LockNextTaskOrchestrationWorkItemAsync(
It.IsAny <TimeSpan>(),
It.IsAny <CancellationToken>()))
.Returns(() => Task.Delay(100).ContinueWith(t => default(TaskOrchestrationWorkItem)));
// We can influence the recommended replica count by modifying concurrency settings
this.testService.OrchestrationServiceOptions.MaxActiveOrchestrations = 1;
await this.testService.StartWorkerAsync();
SqlOrchestrationService orchestrationService = this.testService.OrchestrationServiceMock.Object;
// Initial scale recommendation should be zero
int recommendation = await orchestrationService.GetRecommendedReplicaCountAsync();
Assert.Equal(0, recommendation);
for (int i = 1; i <= 10; i++)
{
// Schedule an orchestration (it won't run, see above)
await this.testService.RunOrchestration(
null as string,
$"EmptyOrchestration{i:00}",
implementation : (ctx, input) => Task.FromResult(input));
// Scale recommendation increments with every new scheduled orchestration.
// We pass in the previous recommendation to generate a log statement about the change.
recommendation = await orchestrationService.GetRecommendedReplicaCountAsync(recommendation);
Assert.Equal(i, recommendation);
}
// Validate the logs
IReadOnlyList <LogEntry> recommendationChangeLogs = this.GetRecommendationChangeLogs();
Assert.Equal(10, recommendationChangeLogs.Count);
for (int i = 0; i < recommendationChangeLogs.Count; i++)
{
LogEntry log = recommendationChangeLogs[i];
LogAssert.FieldEquals(log, "CurrentCount", i);
LogAssert.FieldEquals(log, "RecommendedCount", i + 1);
}
}