/// <summary>
/// Initializes a new instance of the <see cref="FileWriter{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="serializer">Format serializer with which messages are serialized.</param>
/// <param name="name">An optional name for the component.</param>
public FileWriter(Pipeline pipeline, string filename, IPersistentFormatSerializer serializer, string name = nameof(FileWriter <T>))
{
this.name = name;
this.file = File.Create(filename);
this.In = pipeline.CreateReceiver <T>(this, (m, e) => this.WriteRecord(m, e, serializer), nameof(this.In));
this.In.Unsubscribed += _ => serializer.PersistFooter(this.file, this.state);
}
private void WriteRecord(T message, Envelope envelope, IPersistentFormatSerializer serializer)
{
if (this.first)
{
this.state = serializer.PersistHeader(message, this.file);
}
serializer.PersistRecord(message, envelope.OriginatingTime, this.first, this.file, this.state);
this.first = false;
}
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 }));
}
}
