I need to implement a resource which needs to verify payments via Google
Play's API.
Unfortunately, google play's access tokens expire every hour. So 1) I need
to generate a token, 2) As incoming requests arrive at /my/api/android I
need to handle them using the token generated, 3) In 1 hour the token will
have expired and will need to be re-generated.
Its step # 3 that's causing me issues. There could be multiple concurrent
requests hitting the api, and multiple requests might hit it at the same
time as the token expires.
I was thinking of resolving it via something like this:
public class MyResource
{
private final GooglePlayClient client = new GooglePlayClient(); //I
assume this will be a singleton, right?
@POST
public Foo handleRequest(Bar someParams)
{
String token = client.getToken();
//Make a request to play's API via the token and return the result
}
}
public class GooglePlayClient
{
private String token;
private long tokenExpireTime;
public GooglePlayClient()
{
genNewToken();
}
private void genNewToken()
{
token = //get new token via google play's api
tokenExpireTime = new Date().getTime();
}
}
public synchronized String getToken()
{
if (new Date().getTime() >= tokenExpireTime)
genNewToken();
return token;
}
}
Will the above implementation work for handling the concurrency / thread
safety aspect? Is there a better way?
Thanks.
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