Skip to main content

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.