public async Task MonitoredItemsProcessorAsync_ShouldWaitFilledBuffer()
{
uint buffersize = 1000;
ManualResetEvent messageReceivedEvent = new ManualResetEvent(false);
var itemProcessor = new HubCommunicationBase();
TelemetryConfiguration = new PublisherTelemetryConfiguration();
itemProcessor.SendIntervalSeconds = 0;
itemProcessor.HubMessageSize = buffersize;
long streamLength = 0;
var hubClient = new Mock <IHubClient>();
hubClient
.Setup(client => client.SendEventAsync(It.IsAny <Message>()))
.Returns(Task.CompletedTask)
.Callback((Message hubMessage) =>
{
streamLength = hubMessage.BodyStream.Length;
messageReceivedEvent.Set();
});
MessageData message = new MessageData
{
DataChangeMessageData = new DataChangeMessageData
{
DisplayName = "Test",
EndpointUrl = "abc123",
EndpointId = "qwe"
}
};
int messageLength = 50;
// the system properties are MessageId (max 128 byte), Sequence number (ulong), ExpiryTime (DateTime) and more. ideally we get that from the client.
Message tempMsg = new Message();
int systemPropertyLength = 128 + sizeof(ulong) + tempMsg.ExpiryTimeUtc.ToString(CultureInfo.InvariantCulture).Length;
int applicationPropertyLength = Encoding.UTF8.GetByteCount($"iothub-content-type=application/opcua+uajson") + Encoding.UTF8.GetByteCount($"iothub-content-encoding=UTF-8");
int jsonSquareBracketLength = 2;
int bufferSizeWithoutOverhead = (int)buffersize - systemPropertyLength - applicationPropertyLength - jsonSquareBracketLength;
//need to reduce buffersize by one for the '[' at the beginning of the message
//need to add 1 to the message length for the ',' that is added after every enqueued Item
//messagesToSend should be 1 higher then the messages received because the last one sent is needed to trigger the buffer overflow
int messagesToSend = (int)((bufferSizeWithoutOverhead - 1) / (messageLength + 1)) + 1;
_ = await Task.Run(() => itemProcessor.InitHubCommunicationAsync(hubClient.Object, false, true));
for (int messagesSent = 0; messagesSent < messagesToSend; messagesSent++)
{
//Check if no message was received before sending the last item.
messageReceivedEvent.WaitOne(0).Should().BeFalse();
itemProcessor.Enqueue(message);
}
//Wait a maximum of 2s for the message to arrive.
messageReceivedEvent.WaitOne(2000).Should().BeTrue();
//for every message, except the last one, there is one "," added
//and the received messages begins with '[' and ends with ']'
streamLength.Should().Be((messageLength + 1) * (messagesToSend - 1) + 1);
}
public async Task MonitoredItemsProcessorAsync_ShouldWaitForTimeout()
{
int timeoutSeconds = 10;
double timeoutAcceptanceThresholdSeconds = 0.1;
AutoResetEvent messageReceivedEvent = new AutoResetEvent(false);
var itemProcessor = new HubCommunicationBase();
itemProcessor.SendIntervalSeconds = timeoutSeconds;
itemProcessor.HubMessageSize = 100000;
TelemetryConfiguration = new PublisherTelemetryConfiguration();
DateTime lastMessageSent = DateTime.UtcNow;
TimeSpan timeBetweenMessages = new TimeSpan();
long streamLength = 0;
int messagesReceived = 0;
var hubClient = new Mock <IHubClient>();
hubClient
.Setup(client => client.SendEventAsync(It.IsAny <Message>()))
.Returns(Task.CompletedTask)
.Callback((Message hubMessage) =>
{
timeBetweenMessages = DateTime.UtcNow.Subtract(lastMessageSent);
lastMessageSent = DateTime.UtcNow;
streamLength = hubMessage.BodyStream.Length;
messageReceivedEvent.Set();
messagesReceived++;
});
MessageData message = new MessageData
{
DataChangeMessageData = new DataChangeMessageData
{
DisplayName = "Test",
EndpointUrl = "abc123",
EndpointId = "qwe"
}
};
int messageLength = 50;
_ = await Task.Factory.StartNew(() => itemProcessor.InitHubCommunicationAsync(hubClient.Object, false, true), TaskCreationOptions.LongRunning);
itemProcessor.Enqueue(message);
itemProcessor.Enqueue(message);
messageReceivedEvent.WaitOne((timeoutSeconds + 5) * 1000).Should().BeTrue();
itemProcessor.Enqueue(message);
itemProcessor.Enqueue(message);
messageReceivedEvent.WaitOne((timeoutSeconds + 5) * 1000).Should().BeTrue();
timeBetweenMessages.TotalMilliseconds.Should().BeApproximately(timeoutSeconds * 1000, timeoutAcceptanceThresholdSeconds * 1000);
//2 messages are sent
//for every message, except the last one, there is one "," added
//and the received messages begins with '[' and ends with ']'
streamLength.Should().Be(messageLength * 2 + 2 + 1);
}