sinks

type MetricSink interface {
	Name() string
	// Start finishes setting up the sink and starts any
	// background processing tasks that the sink might have to run
	// in the background. It's invoked when the server starts.
	Start(traceClient *trace.Client) error
	// Flush receives `InterMetric`s from Veneur and is
	// responsible for "sinking" these metrics to whatever it's
	// backend wants. Note that the sink must **not** mutate the
	// incoming metrics as they are shared with other sinks. Sinks
	// must also check each metric with IsAcceptableMetric to
	// verify they are eligible to consume the metric.
	Flush(context.Context, []samplers.InterMetric) error
	// Handle non-metric, non-span samples.
	FlushOtherSamples(ctx context.Context, samples []ssf.SSFSample)
}

type SpanSink interface {
	// Start finishes setting up the sink and starts any
	// background processing tasks that the sink might have to run
	// in the background. It's invoked when the server starts.
	Start(*trace.Client) error

	// Name returns the span sink's name for debugging purposes
	Name() string

	// Flush receives `SSFSpan`s from Veneur **as they arrive**. If the sink wants
	// to buffer spans it may do so and defer sending until `Flush` is called.
	Ingest(*ssf.SSFSpan) error

	// Invoked at the same interval as metric flushes, this can be used as a
	// signal for the sink to write out if it was buffering or something.
	Flush()
}