SparseUserDatabase (Apache Tomcat 9.0.120 API Documentation)
Description: declaration: package: org.apache.catalina.users, class: SparseUserDatabase

# Class SparseUserDatabase

java.lang.Object
org.apache.catalina.users.SparseUserDatabase

All Implemented Interfaces:
  `UserDatabase`

Direct Known Subclasses:
  `DataSourceUserDatabase`

public abstract class SparseUserDatabase extends Object implements UserDatabase
Abstract base class for a sparse user database implementation. A sparse database creates MBeans for users, groups, and roles on demand rather than registering all of them at startup.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `SparseUserDatabase()`
  Default constructor required for subclasses.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `isSparse()`
  Indicates that this is a sparse user database.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods inherited from interface UserDatabase

  `backgroundProcess, close, createGroup, createRole, createUser, findGroup, findRole, findUser, getGroups, getId, getRoles, getUsers, isAvailable, modifiedGroup, modifiedRole, modifiedUser, open, removeGroup, removeRole, removeUser, save`

- ## Constructor Details

  - ### SparseUserDatabase

    public SparseUserDatabase()
    Default constructor required for subclasses.

- ## Method Details

  - ### isSparse

    public boolean isSparse()
    Indicates that this is a sparse user database.
    Specified by:
      `isSparse` in interface `UserDatabase`
    Returns:
      always `true`