com.datastax.driver.core
Interface LatencyTracker

public interface LatencyTracker

Interface for object that are interested in tracking the latencies of the driver queries to each Cassandra nodes.

An implementaion of this interface can be registered against a Cluster object trough the Cluster.register(com.datastax.driver.core.Host.StateListener) method, after which the update will be called after each query of the driver to a Cassandra host with the latency/duration (in nanoseconds) of this operation.

Method Summary

void	update(Host host, long newLatencyNanos) A method that is called after each request to a Cassandra node with the duration of that operation.

Method Detail

update

void update(Host host,
            long newLatencyNanos)

A method that is called after each request to a Cassandra node with the duration of that operation.

Note that there is no guarantee that this method won't be called concurrently by multiple thread, so implementations should synchronize internally if need be.

Parameters:

host - the Cassandra host on which a request has been performed.

newLatencyNanos - the latency in nanoseconds of the operation. This latency corresponds to the time elapsed between when the query was send to host and when the response was received by the driver (or the operation timeoued, in which newLatencyNanos will approximately be the timeout value).