public interface LatencyTracker
An implementation 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(Host, Statement, Exception,
long) method will be called after each query of the driver to a Cassandra host with the
latency/duration (in nanoseconds) of this operation.
|Modifier and Type||Method and Description|
Gets invoked when the tracker is registered with a cluster, or at cluster startup if the tracker was registered at initialization with
Gets invoked when the tracker is unregistered from a cluster, or at cluster shutdown if the tracker was not unregistered.
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 threads, so implementations should synchronize internally if need be.
host- The Cassandra host on which a request has been performed. This parameter is never
Statementthat has been executed. This parameter is never
Exceptionthrown when receiving the response, or
nullif the response was successful.
newLatencyNanos- the latency in nanoseconds of the operation. This latency corresponds to the time elapsed between when the query was sent to
hostand when the response was received by the driver (or the operation timed out, in which
newLatencyNanoswill approximately be the timeout value).
void onRegister(Cluster cluster)
cluster- the cluster that this tracker is registered with.
void onUnregister(Cluster cluster)
cluster- the cluster that this tracker was registered with.
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