public async Task <long?> CountStreamRemainingEventsAsync(
StreamCoordinates coordinates,
StreamShardingSettings shardingSettings,
CancellationToken cancellationToken = default)
{
try
{
var endCoordinates = await SeekToEndAsync(shardingSettings, cancellationToken).ConfigureAwait(false);
var distance = coordinates.DistanceTo(endCoordinates);
log.Debug(
"Stream remaining events: {Count}. Current coordinates: {CurrentCoordinates}, end coordinates: {EndCoordinates}.",
distance,
coordinates,
endCoordinates);
return(distance);
}
catch (Exception e)
{
log.Warn(e, "Failed to count remaining events.");
return(null);
}
}
public void Distance_should_work_correctly()
{
var a = new StreamCoordinates(
new[]
{
new StreamPosition {
Partition = 0, Offset = 1
},
new StreamPosition {
Partition = 1, Offset = 100
}
});
var b = new StreamCoordinates(
new[]
{
new StreamPosition {
Partition = 1, Offset = 200
},
new StreamPosition {
Partition = 2, Offset = 2
}
});
a.DistanceTo(b).Should().Be(102);
b.DistanceTo(a).Should().Be(-99);
}
private double?CountStreamRemainingEvents()
{
if (coordinates == null)
{
return(null);
}
var end = SeekToEndAsync(shardingSettings).GetAwaiter().GetResult();
var distance = coordinates.DistanceTo(end);
log.Info(
"Consumer progress: events remaining: {EventsRemaining}. Current coordinates: {CurrentCoordinates}, end coordinates: {EndCoordinates}.",
distance,
coordinates,
end);
return(distance);
}
