org.apache.iotdb.db.auth.user

类 LocalFileUserAccessor

java.lang.Object

org.apache.iotdb.db.auth.user.LocalFileUserAccessor

所有已实现的接口:

IUserAccessor

public class LocalFileUserAccessor
extends Object
implements IUserAccessor

This class loads a user's information from the corresponding file.The user file is a sequential file. User file schema: Int32 username bytes size Utf-8 username bytes Int32 Password bytes size Utf-8 password bytes Int32 seriesPath privilege number n Int32 seriesPath[1] size Utf-8 seriesPath[1] bytes Int32 privilege num k1 Int32 privilege[1][1] Int32 privilege[1][2] ... Int32 privilege[1][k1] Int32 seriesPath[2] size Utf-8 seriesPath[2] bytes Int32 privilege num k2 Int32 privilege[2][1] Int32 privilege[2][2] ... Int32 privilege[2][k2] ... Int32 seriesPath[n] size Utf-8 seriesPath[n] bytes Int32 privilege num kn Int32 privilege[n][1] Int32 privilege[n][2] ... Int32 privilege[n][kn] Int32 user name number m Int32 user name[1] size Utf-8 user name[1] bytes Int32 user name[2] size Utf-8 user name[2] bytes ... Int32 user name[m] size Utf-8 user name[m] bytes

构造器概要

构造器

构造器和说明
LocalFileUserAccessor(String userDirPath)

方法概要

限定符和类型	方法和说明
boolean	deleteUser(String username) Delete a user's user file.
List<String>	listAllUsers() List all users existing in the database.
User	loadUser(String username) Deserialize a user from its user file.
void	reset() Re-initialize this object.
void	saveUser(User user) Serialize the user object to a temp file, then replace the old user file with the new file.

从类继承的方法 java.lang.Object

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

构造器详细资料

LocalFileUserAccessor

public LocalFileUserAccessor(String userDirPath)

方法详细资料

loadUser

public User loadUser(String username)
              throws IOException

Deserialize a user from its user file.

指定者:

loadUser 在接口中 IUserAccessor

参数:

username - The name of the user to be deserialized.

返回:

The user object or null if no such user.

抛出:

IOException - if an exception is raised when interacting with the lower storage.

saveUser

public void saveUser(User user)
              throws IOException

Serialize the user object to a temp file, then replace the old user file with the new file.

指定者:

saveUser 在接口中 IUserAccessor

参数:

user - The user object that is to be saved.

抛出:

IOException - if an exception is raised when interacting with the lower storage.

deleteUser

public boolean deleteUser(String username)
                   throws IOException

Delete a user's user file.

指定者:

deleteUser 在接口中 IUserAccessor

参数:

username - The name of the user to be deleted.

返回:

True if the file is successfully deleted, false if the file does not exists.

抛出:

IOException - when the file cannot be deleted.

listAllUsers

public List<String> listAllUsers()

从接口复制的说明: IUserAccessor

List all users existing in the database.

指定者:

listAllUsers 在接口中 IUserAccessor

返回:

A list that contains names of all users.

reset

public void reset()

从接口复制的说明: IUserAccessor

Re-initialize this object.

指定者:

reset 在接口中 IUserAccessor