Android OkHttp, refresh expired token

Question

Scenario: I am using OkHttp / Retrofit to access a web service: multiple HTTP requests are sent out at the same time. At some point the auth token expires, and

Answer 1

Edited for thread safety

Havent looked at OkHttp or retrofit but how about having a static flag that is set as soon as a token fails and check for that flag before you request a new token?

private static AtomicBoolean requestingToken = new AtomicBoolean(false);

//..... 
if (requestingToken.get() == false)
 {
    requestingToken.set(true);
    //.... request a new token
 }