Package com.google.cloud.spanner.spi.v1

Interface LatencyTracker

All Known Implementing Classes:

EwmaLatencyTracker

@InternalApi
@BetaApi
public interface LatencyTracker

Interface for tracking latency scores of Spanner servers.

Implementations must be thread-safe as instances may be shared across multiple concurrent operations.

Method Summary

Modifier and Type	Method	Description
double	getScore()	Returns the current latency score.
void	recordError(Duration penalty)	Records an error and applies a latency penalty.
void	update(Duration latency)	Updates the latency score with a new observation.

Method Details

getScore

double getScore()

Returns the current latency score.

Returns:

the latency score, where lower is better.

update

void update(Duration latency)

Updates the latency score with a new observation.

Parameters:

latency - the observed latency.

recordError

void recordError(Duration penalty)

Records an error and applies a latency penalty.

Parameters:

penalty - the penalty to apply.