UserManager (Tapkey.MobileLib null)

```
public interface UserManager
```
The user manager takes care of user authentication and provides access to the currently logged-in users.
The following code sample illustrates how to use this class to retrieve the list of logged-in users.
```
 UserManager userManager = tapkeyServiceFactory.getUserManager();
 List<String> users = userManager.getUsers();

 // Now, users contains a list of IDs of all logged-in users. Usually, users.size() will be 1,
 // however, it is possible to log in multiple users at the same time.
 
```
The exemplary code below demonstrates how to log in a user:
```
 UserManager userManager = tapkeyServiceFactory.getUserManager();
 userManager.logInAsync(tapkeyAccessToken, ct);
 
```
Implementors have to make sure that a token refresh handler was set via the TapkeyServiceFactory builder prior to logging in any users.
See Also:

https://developers.tapkey.io/mobile/authentication/

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`net.tpky.mc.manager.HttpAuthenticationProvider`	`getHttpAuthenticationProvider()`	Reserved for internal use.
`List<String>`	`getUsers()`	Returns IDs of the users who are currently logged in.
`Promise<String>`	`logInAsync(String accessToken, CancellationToken cancellationToken)`	Logs in a user with a Tapkey access token.
`Promise<Void>`	`logOutAsync(String userId, CancellationToken cancellationToken)`	Logs out a user with a Tapkey access token.
`void`	`updateAccessToken(String userId, String accessToken)`	Replaces the access token for the specified user.

- Method Detail
  - getUsers
```
List<String> getUsers()
```
    Returns IDs of the users who are currently logged in.
    
    Returns:
    
    the users' IDs.
  - logInAsync
```
Promise<String> logInAsync(String accessToken,
                           CancellationToken cancellationToken)
```
    Logs in a user with a Tapkey access token.
    
    Parameters:
    
    accessToken - the Tapkey access token to be used for logging in the user.
    
    cancellationToken - can be used to get notified on cancel events.
    
    Returns:
    
    a Promise that resolves to the ID of the user logged in.
  - logOutAsync
```
Promise<Void> logOutAsync(String userId,
                          CancellationToken cancellationToken)
```
    Logs out a user with a Tapkey access token.
    
    Parameters:
    
    userId - the ID of the user to be logged out.
    
    cancellationToken - can be used to get notified on cancel events.
    
    Returns:
    
    a Promise that resolves after the logout has completed.
  - updateAccessToken
```
void updateAccessToken(String userId,
                       String accessToken)
```
    Replaces the access token for the specified user.
    
    Parameters:
    
    userId - the ID of the user whose access token is to be replaced.
    
    accessToken - the new access token
  - getHttpAuthenticationProvider
```
net.tpky.mc.manager.HttpAuthenticationProvider getHttpAuthenticationProvider()
```
    Reserved for internal use.