com.datastax.driver.core

Interface Host.StateListener

All Known Subinterfaces:

Host.LifecycleAwareStateListener

Enclosing class:

Host

public static interface Host.StateListener

Interface for listeners that are interested in hosts added, up, down and removed events.

It is possible for the same event to be fired multiple times, particularly for up or down events. Therefore, a listener should ignore the same event if it has already been notified of a node's state.

Method Summary

Modifier and Type	Method and Description
void	onAdd(Host host) Called when a new node is added to the cluster.
void	onDown(Host host) Called when a node is determined to be down.
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	onRemove(Host host) Called when a node is removed from the cluster.
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	onUp(Host host) Called when a node is determined to be up.

Method Detail

onAdd

void onAdd(Host host)

Called when a new node is added to the cluster.

The newly added node should be considered up.

Parameters:

host - the host that has been newly added.

onUp

void onUp(Host host)

Called when a node is determined to be up.

Parameters:

host - the host that has been detected up.

onDown

void onDown(Host host)

Called when a node is determined to be down.

Parameters:

host - the host that has been detected down.

onRemove

void onRemove(Host host)

Called when a node is removed from the cluster.

Parameters:

host - the removed host.

onRegister

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).

Parameters:

cluster - the cluster that this tracker is registered with.

onUnregister

void onUnregister(Cluster cluster)

Gets invoked when the tracker is unregistered from a cluster, or at cluster shutdown if the tracker was not unregistered.

Parameters:

cluster - the cluster that this tracker was registered with.