public interface LatencyTracker
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 |
---|---|
void |
onRegister(Cluster cluster)
Gets invoked when the tracker is registered with a cluster, or at cluster startup if the
tracker was registered at initialization with
Cluster.register(LatencyTracker) . |
void |
onUnregister(Cluster cluster)
Gets invoked when the tracker is unregistered from a cluster, or at cluster shutdown if
the tracker was not unregistered.
|
void |
update(Host host,
Statement statement,
Exception exception,
long newLatencyNanos)
A method that is called after each request to a Cassandra node with
the duration of that operation.
|
void update(Host host, Statement statement, Exception exception, long newLatencyNanos)
host
- The Cassandra host on which a request has been performed.
This parameter is never null
.statement
- The Statement
that has been executed.
This parameter is never null
.exception
- An Exception
thrown when receiving the response, or null
if 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 host
and
when the response was received by the driver
(or the operation timed out, in which newLatencyNanos
will approximately be the timeout value).void onRegister(Cluster cluster)
Cluster.register(LatencyTracker)
.cluster
- the cluster that this tracker is registered with.void onUnregister(Cluster cluster)
cluster
- the cluster that this tracker was registered with.Copyright © 2012–2017. All rights reserved.