org.apache.zookeeper

Interface AsyncCallback

All Known Subinterfaces:

AsyncCallback.ACLCallback, AsyncCallback.AllChildrenNumberCallback, AsyncCallback.Children2Callback, AsyncCallback.ChildrenCallback, AsyncCallback.Create2Callback, AsyncCallback.DataCallback, AsyncCallback.EphemeralsCallback, AsyncCallback.MultiCallback, AsyncCallback.StatCallback, AsyncCallback.StringCallback, AsyncCallback.VoidCallback

All Known Implementing Classes:

ZooKeeperSaslClient.ServerSaslResponseCallback

@InterfaceAudience.Public
public interface AsyncCallback

Interface definitions of asynchronous callbacks.

ZooKeeper provides asynchronous version as equivalent to synchronous APIs.

An asynchronous callback is deferred to invoke after a function returns. Asynchronous calls usually improve system efficiency on IO-related APIs.

It is highly recommended NOT to perform any blocking operation inside the callbacks. If you block the thread the ZooKeeper client won't process other events.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	AsyncCallback.ACLCallback This callback is used to retrieve the ACL and stat of the node.
static interface	AsyncCallback.AllChildrenNumberCallback This callback is used to get all children node number of the node.
static interface	AsyncCallback.Children2Callback This callback is used to retrieve the children and stat of the node.
static interface	AsyncCallback.ChildrenCallback This callback is used to retrieve the children of the node.
static interface	AsyncCallback.Create2Callback This callback is used to retrieve the name and stat of the node.
static interface	AsyncCallback.DataCallback This callback is used to retrieve the data and stat of the node.
static interface	AsyncCallback.EphemeralsCallback This callback is used to process the getEphemerals results from a single getEphemerals call.
static interface	AsyncCallback.MultiCallback This callback is used to process the multiple results from a single multi call.
static interface	AsyncCallback.StatCallback This callback is used to retrieve the stat of the node.
static interface	AsyncCallback.StringCallback This callback is used to retrieve the name of the node.
static interface	AsyncCallback.VoidCallback This callback doesn't retrieve anything from the node.