Recipe: Persistent Node
Description
A persistent node is a node that attempts to stay present in ZooKeeper, even through connection and session interruptions.
Participating Classes
- PersistentNode
Creating a PersistentNode
// Parameters:
// client - client instance
// mode - creation mode
// useProtection - if true, call CreateBuilder.withProtection()
// basePath - the base path for the node
// data - data for the node
// useParentCreation - if true, call CreateBuilder.creatingParentContainersIfNeeded()
public PersistentNode(
CuratorFramework client,
CreateMode mode,
boolean useProtection,
String basePath,
byte[] data,
boolean useParentCreation
);
General Usage
PersistentNodes must be started:
node.start();
When you are through with the PersistentNode instance, you should call close:
node.close();
... this will delete the node
Error Handling
PersistentNode instances internally handle all error states recreating the node as necessary.