TokenManager (HttpClient 1.0.0 API)

java.lang.Object
- com.networknt.http.client.oauth.TokenManager

```
public class TokenManager
extends Object
```
This class is a singleton to manage ALL tokens. This TokenManager provides a simple method to consumer to get a token. It manages caches based on different cache strategies underneath.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static TokenManager`	`getInstance()`
`Result<Jwt>`	`getJwt()`
`Result<Jwt>`	`getJwt(Jwt.Key key)`	get a Jwt with a provided Key (Key is either scope or a service id inputted by user, for caching usage): 1.if a token is cached with provided key - if the token is expired, renew it right away.
`Result<Jwt>`	`getJwt(Set<String> scopeSet, String serviceId)`	get a Jwt with a provided clientRequest, it will get token based on Jwt.Key (either scope or service_id) if the user declared both scope and service_id in header, it will get jwt based on scope

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getInstance
```
public static TokenManager getInstance()
```
  - getJwt
```
public Result<Jwt> getJwt(Jwt.Key key)
```
    get a Jwt with a provided Key (Key is either scope or a service id inputted by user, for caching usage): 1.if a token is cached with provided key - if the token is expired, renew it right away. - if the token is almost expired, use this token and renew it silently. - if the token is not almost expired, just use this token. 2.if a token is not cached with provided key - get a new jwt from oauth server 3.after getting the valid token, cache that token no matter if it's already cached or not. The strategy should determine how to cache it.
    
    Parameters:
    
    key - either based on scope or service id
    
    Returns:
    
    a Jwt if successful, otherwise return error Status.
  - getJwt
```
public Result<Jwt> getJwt(Set<String> scopeSet,
                          String serviceId)
```
    get a Jwt with a provided clientRequest, it will get token based on Jwt.Key (either scope or service_id) if the user declared both scope and service_id in header, it will get jwt based on scope
    
    Parameters:
    
    scopeSet - scope set for cache
    
    serviceId - service id for cache
    
    Returns:
    
    Result
  - getJwt
```
public Result<Jwt> getJwt()
```