private static DateTime GetStartTimeFromFile(string filename, IPersistentFormatDeserializer deserializer)
{
DateTime startTime;
using var stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
(_, startTime) = deserializer.DeserializeRecords(stream).First();
return(startTime);
}
private static IEnumerator <(T, DateTime)> EnumerateFile(string filename, IPersistentFormatDeserializer deserializer)
{
using var stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
foreach (var record in deserializer.DeserializeRecords(stream))
{
yield return((T)record.Item1, record.Item2);
}
}
private void FilePersistenceFormatTest(string extension, IPersistentFormatSerializer serializer, IPersistentFormatDeserializer deserializer)
{
var filePath = $"{this.path}/test.{extension}";
using (var p = Pipeline.Create())
{
var gen = Generators.Range(p, 0, 10, TimeSpan.FromMilliseconds(10));
var file = new FileWriter <int>(p, filePath, serializer);
gen.PipeTo(file);
p.Run();
}
using (var q = Pipeline.Create())
{
var read = new FileSource <int>(q, filePath, deserializer);
var results = read.ToObservable().ToListObservable();
q.Run();
Assert.IsTrue(Enumerable.SequenceEqual(results.AsEnumerable(), new[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="FileSource{T}"/> class.
/// </summary>
/// <param name="pipeline">The pipeline to add the component to.</param>
/// <param name="filename">File name to which to persist.</param>
/// <param name="deserializer">Format serializer with which messages are deserialized.</param>
/// <param name="name">An optional name for the component.</param>
public FileSource(Pipeline pipeline, string filename, IPersistentFormatDeserializer deserializer, string name = nameof(FileSource <T>))
: base(pipeline, EnumerateFile(filename, deserializer), GetStartTimeFromFile(filename, deserializer), name: name)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="FileSource{T}"/> class.
/// </summary>
/// <param name="pipeline">Pipeline to which this component belongs.</param>
/// <param name="filename">File name to which to persist.</param>
/// <param name="deserializer">Format serializer with which messages are deserialized.</param>
public FileSource(Pipeline pipeline, string filename, IPersistentFormatDeserializer deserializer)
: base(pipeline, EnumerateFile(pipeline, filename, deserializer))
{
}
