public void CaptureReader_Correctly_Assigns_Offsets_To_ICaptureState_Instances_When_Read()
{
var stateController = new WeatherStateController(new WeatherSimulator());
var stateResolver = new StateResolver();
stateResolver.Add(stateController);
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
ms.Position = 0;
var stream = new ConcurrentStream(ms);
var captureStream = new CaptureStream(stream, FileAccess.Read, stateResolver);
var lastOffset = 0d;
for (int i = 0; i < captureStream.Count; i++)
{
var state = captureStream.Read();
Assert.True(state.Offset >= 0);
Assert.True(state.Offset >= lastOffset);
lastOffset = state.Offset;
}
}
public void CaptureService_Can_Write_A_Capture_To_Disk_When_Backed_By_A_FileStream()
{
var statesToWrite = 100;
var simulator = new WeatherSimulator();
var controller = new WeatherStateController(simulator);
var stateResolver = new StateResolver();
stateResolver.Add(controller);
var tmpFile = System.IO.Path.GetTempFileName();
try
{
using (var ms = new FileStream(tmpFile,FileMode.Create))
{
var baseStream = new ConcurrentStream(ms);
var captureService = new CaptureService
{
Stream = baseStream,
StateResolver = stateResolver
};
captureService.Start();
controller.Initialise(captureService.CaptureStream);
simulator.Start();
var count = 0;
var resetEvent = new SlimResetEvent(20);
simulator.NewTemperature += delegate
{
count++;
if (count == statesToWrite)
{
simulator.Stop();
resetEvent.Set();
}
};
resetEvent.Wait();
captureService.Flush();
}
Assert.True(File.Exists(tmpFile));
Assert.True(new FileInfo(tmpFile).Length > 0);
}
finally
{
File.Delete(tmpFile);
}
}
public void PlaybackService_Supports_Multiple_ICaptureStream_Instances()
{
var resetEvent = new SlimResetEvent(20);
var expectedStates = long.MaxValue;
var executedStates = 0;
var stateController = new WeatherStateController(new WeatherSimulator());
var stateResolver = new StateResolver();
stateResolver.Add(stateController);
stateController.StateExecuted += delegate
{
executedStates++;
if (executedStates == expectedStates)
{
resetEvent.Set();
}
};
var playbackService = new PlaybackService(stateResolver);
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream1 = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream1 = new CaptureStream(stream1, System.IO.FileAccess.Read, stateResolver);
var stream2 = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream2 = new CaptureStream(stream2, System.IO.FileAccess.Read, stateResolver);
expectedStates = captureStream1.Count + captureStream2.Count;
playbackService.Add(captureStream1);
playbackService.Add(captureStream2);
playbackService.Start();
resetEvent.Wait();
}
public void When_A_Filter_Is_Applied_That_Returns_True_The_State_Is_Not_Scheduled_For_Playback()
{
var stateController = new WeatherStateController(new WeatherSimulator());
var stateResolver = new StateResolver();
stateResolver.Add(stateController);
var scheduler = new Mock<IScheduler>();
var taskFactory = new Mock<ITaskFactory>();
var playbackService = new PlaybackService(stateResolver, scheduler.Object, taskFactory.Object);
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream = new CaptureStream(stream, System.IO.FileAccess.Read, stateResolver);
playbackService.Add(captureStream);
//add in a filter that will always return true to filter out the states
playbackService.Add(new StreamFilter(f => true));
playbackService.Start();
//task factory should not have built any tasks
taskFactory.Verify(t => t.Create(It.IsAny<ICaptureState>()), Times.Never());
scheduler.Verify(s => s.Add(It.IsAny<ITask>()), Times.Never());
}
public void When_A_Codec_Is_Not_Available_An_Event_Is_Raised_With_The_Guid_Of_The_Required_Codec()
{
var stateController = new WeatherStateController(new WeatherSimulator());
var stateResolver = new StateResolver();
stateResolver.Add(stateController);
var playbackService = new PlaybackService(stateResolver);
playbackService.CodecRequired += delegate(object sender, CodecRequiredEventArgs e)
{
Assert.Equal(stateController.Guid, e.Guid);
};
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream = new CaptureStream(stream, System.IO.FileAccess.Read, stateResolver);
playbackService.Add(captureStream);
}
public void When_A_Codec_Is_Not_Available_An_Event_Is_Raised_Giving_The_Caller_An_Opportunity_To_Acquire_It()
{
var stateController = new WeatherStateController(new WeatherSimulator());
var stateResolver = new StateResolver();
var eventRaised = false;
var playbackService = new PlaybackService(stateResolver);
playbackService.CodecRequired += delegate
{
eventRaised = true;
};
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream = new CaptureStream(stream, System.IO.FileAccess.Read, stateResolver);
playbackService.Add(captureStream);
Assert.True(eventRaised);
}
public void CaptureWriter_Buids_A_Valid_Continuum_Header()
{
var baseStream = new ConcurrentStream(new MemoryStream());
var stateResolver = new StateResolver();
var stateController = new WeatherStateController(new WeatherSimulator());
stateResolver.Add(stateController);
var captureWriter = new CaptureWriter(baseStream, stateResolver);
baseStream.Position = 0;
byte[] header = new byte[Constants.CONTINUUM_HEADER_SIGNATURE.Length];
baseStream.Read(header, 0, header.Length);
for (int i = 0; i < Constants.CONTINUUM_HEADER_SIGNATURE.Length; i++)
{
Assert.Equal(Constants.CONTINUUM_HEADER_SIGNATURE[i], header[i]);
}
//dont worry about 4 bytes reserved for version info at the moment
baseStream.Position = baseStream.Position + 4;
//ignore the timestamp for now
baseStream.Position = baseStream.Position + 8;
//ignore the count property for now
baseStream.Position = baseStream.Position + 8;
//ignore the length property for now
baseStream.Position = baseStream.Position + 8;
//read the SAT, there should be at least one entry for it to be valid
//the SAT looks like this:
//<lengthOfSac><firstId of type short><delimiter>
var lengthOfSatBuffer = new byte[4];
baseStream.Read(lengthOfSatBuffer, 0, lengthOfSatBuffer.Length);
var lengthOfSat = BitConverter.ToInt32(lengthOfSatBuffer, 0);
Assert.True(lengthOfSat > 0);
//read back the sat
var readSat = new Dictionary<short, Guid>();
for (int i = 0; i < lengthOfSat; i++)
{
var idBuffer = new byte[2];
baseStream.Read(idBuffer, 0, idBuffer.Length);
var guid = new byte[16]; //guids are 16-bytes
baseStream.Read(guid, 0, guid.Length);
readSat.Add(BitConverter.ToInt16(idBuffer, 0), new Guid(guid));
}
//match the sat
foreach (var kvp in stateResolver.AllocationTable)
{
Assert.True(readSat.ContainsKey(kvp.Value));
Assert.True(readSat[kvp.Value] == kvp.Key);
}
}
public void Selecting_A_Position_When_The_Current_Position_Is_Zero_Will_Read_That_Node()
{
var controller = new WeatherStateController(new WeatherSimulator());
_StateResolver = new StateResolver();
_StateResolver.Add(controller);
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream = new CaptureStream(stream, System.IO.FileAccess.Read, _StateResolver);
var desiredNode = Math.Round(Convert.ToDouble(captureStream.Count) / 2);
captureStream.Position = (long)desiredNode - 1; //if the desired node is 50, its required to put the stream at position 49 in order to read it
var seekNode = captureStream.Read();
//manually read nodes, when the desired node is reached it should match the node pulled out previously
stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
captureStream = new CaptureStream(stream, FileAccess.Read, _StateResolver);
ICaptureState actualNode = null;
for (int i = 0; i < desiredNode; i++)
{
actualNode = captureStream.Read();
}
Assert.Equal(actualNode.Guid, seekNode.Guid);
Assert.Equal(actualNode.Offset, seekNode.Offset);
Assert.Equal(actualNode.Timestamp, seekNode.Timestamp);
for (int i = 0; i < actualNode.Data.Length; i++)
{
Assert.Equal(actualNode.Data[i], seekNode.Data[i]);
}
}
public void Selecting_A_Position_Forward_In_The_Stream_When_The_Current_Position_Is_Not_Zero_Will_Read_That_Node()
{
_StateResolver = new StateResolver();
var controller = new WeatherStateController(new WeatherSimulator());
_StateResolver.Add(controller);
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream = new CaptureStream(stream, System.IO.FileAccess.Read, _StateResolver);
var desiredNode = Math.Round(Convert.ToDouble(captureStream.Count) / 2);
//read up the number of nodes to move the position pointer forwards in the stream
for (int i = 0; i < desiredNode; i++)
{
captureStream.Read();
}
//seek to the new position
captureStream.Position += 2;
//this node is equivalent to node desiredNode + 3
var seekNode = captureStream.Read();
//manually read nodes, when the desired node is reached it should match the node pulled out previously
stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
captureStream = new CaptureStream(stream, FileAccess.Read, _StateResolver);
ICaptureState actualNode = null;
for (int i = 0; i < desiredNode + 3; i++)
{
actualNode = captureStream.Read();
}
Assert.Equal(actualNode.Guid, seekNode.Guid);
Assert.Equal(actualNode.Offset, seekNode.Offset);
Assert.Equal(actualNode.Timestamp, seekNode.Timestamp);
for (int i = 0; i < actualNode.Data.Length; i++)
{
Assert.Equal(actualNode.Data[i], seekNode.Data[i]);
}
}
public void Selecting_A_Position_Beyond_The_Length_Of_The_Stream_Will_Throw_An_Exception()
{
_StateResolver = new StateResolver();
var controller = new WeatherStateController(new WeatherSimulator());
_StateResolver.Add(controller);
var ms = VastPark.FrameworkBase.IO.EmbeddedResource.GetMemoryStream("Continuum.Test.Samples.weather-simulation.continuum", Assembly.GetExecutingAssembly());
var stream = new ConcurrentStream(new MemoryStream(ms.ToArray()));
var captureStream = new CaptureStream(stream, System.IO.FileAccess.Read, _StateResolver);
Assert.Throws(typeof(Exception), new Assert.ThrowsDelegate(delegate { captureStream.Position = captureStream.Count + 1; }));
}
public void Custom_Capture_Formats_Are_Recorded_Correctly()
{
var resetEvent = new SlimResetEvent(20);
var desiredStates = 200;
var generatedStates = 0;
var ms = new MemoryStream();
var stream = new ConcurrentStream(ms);
var weatherSimulator = new WeatherSimulator();
_StateResolver = new StateResolver();
//build the controller that manages weather states
var controller = new WeatherStateController(weatherSimulator);
//watch the simluator for the desired number of states
weatherSimulator.NewTemperature += delegate
{
generatedStates++;
if (generatedStates >= desiredStates)
{
weatherSimulator.Stop();
resetEvent.Set();
}
};
//register it with the capture service
_StateResolver = new StateResolver();
_StateResolver.Add(controller);
//create the capture stream, will create an entry in the SAT for the WeatherStateController
var captureStream = new CaptureStream(stream, FileAccess.Write, _StateResolver);
//pass the controller the stream so that it can be written to
controller.Initialise(captureStream);
//start the simulator, the controller will watch for changes internally
weatherSimulator.Start();
//wait until the event is raised [desiredStates] number of times
resetEvent.Wait();
Assert.Equal(generatedStates, captureStream.Count);
//rewind the stream and open it for reading, verify the values match
stream.Position = 0;
captureStream = new CaptureStream(stream, FileAccess.Read, _StateResolver);
for (int i = 0; i < captureStream.Count; i++)
{
var state = captureStream.Read();
Assert.Equal(weatherSimulator.History[i], (state as WeatherCaptureState).Temperature);
}
}
public void CaptureStream_Supports_Writing_A_State_And_Then_Reading_It()
{
var stateController = new WeatherStateController(new WeatherSimulator());
var stateResolver = new StateResolver();
stateResolver.Add(stateController);
var baseStream = new ConcurrentStream(new MemoryStream());
var captureStream = new CaptureStream(baseStream, FileAccess.ReadWrite, stateResolver);
Assert.True(captureStream.CanRead);
Assert.True(captureStream.CanWrite);
//write a state then read it back
var expectedBytes = Guid.NewGuid().ToByteArray();
captureStream.Write(new WeatherCaptureState(expectedBytes, stateController.Guid, DateTime.UtcNow, 0));
//the read pointer is still at the start of the stream
var readState = captureStream.Read();
for (int i = 0; i < readState.Data.Length; i++)
{
Assert.Equal(expectedBytes[i], readState.Data[i]);
}
}