public DeviceService(IConnectableObservable <IDeviceView> source)
{
_disposable.Add(source
.GroupBy(x => x.DeviceId)
.Subscribe(deviceStream => {
_disposable.Add(deviceStream
.Scan(DeviceUpdateEvent.GetInitialView(deviceStream.Key), DeviceUtils.Update)
.Subscribe(GetCreateSubject(deviceStream.Key)));
}));
_disposable.Add(source.Connect());
}
BehaviorSubject <DeviceUpdateEvent> GetCreateSubject(Guid deviceId)
{
return(_streams.GetOrAdd(deviceId, Create).Value);
Lazy <BehaviorSubject <DeviceUpdateEvent> > Create(Guid id)
{
return(new Lazy <BehaviorSubject <DeviceUpdateEvent> >(() => {
var subject = new BehaviorSubject <DeviceUpdateEvent>(DeviceUpdateEvent.GetInitialView(deviceId));
_disposable.Add(subject);
return subject;
}));
}
}
public async Task Test1()
{
DeviceUpdateEvent deviceView1 = null;
DeviceUpdateEvent deviceView2 = null;
var input = new AsyncProducerConsumerQueue <IDeviceView>();
var source = new ConnectableObservableForAsyncProducerConsumerQueue <IDeviceView>(input);
var id1 = Guid.NewGuid();
var id2 = Guid.NewGuid();
await input.EnqueueAsync(new DeviceVoltagesUpdateView { DeviceId = id1, Voltage = 1 });
await input.EnqueueAsync(new DeviceVoltagesUpdateView { DeviceId = id1, Voltage = 2 });
var service = new DeviceService(source);
await Task.Delay(100);
service.GetDeviceStream(id1).Subscribe(x => deviceView1 = x);
service.GetDeviceStream(id2).Subscribe(x => deviceView2 = x);
/// I believe there is no need to pause here because the Subscribe method calls above
/// block until the events have all been pushed into the subscribers above.
await Task.Delay(1000);
Assert.AreEqual(deviceView1.View.DeviceId, id1);
Assert.AreEqual(deviceView1.View.Voltage, 2);
await input.EnqueueAsync(new DeviceVoltagesUpdateView { DeviceId = id2, Voltage = 100 });
await Task.Delay(1000);
Assert.AreEqual(deviceView2.View.DeviceId, id2);
Assert.AreEqual(deviceView2.View.Voltage, 100);
//await input.EnqueueAsync(new DeviceVoltagesUpdateView { DeviceId = id2, Voltage = 101 });
//await Task.Delay(1000); /// Give the event time to propagate.
//Assert.AreEqual(deviceView2.View.Voltage, 101);
}
