@Override
public GetAccessTokenResult getAccessToken(Iterable<String> scopes) {
MemcacheService memcache = MemcacheServiceFactory.getMemcacheService(MEMCACHE_NAMESPACE);
String memcacheKey = memcacheKeyForScopes(scopes);
GetAccessTokenResult result;
Object memcacheResult = memcache.get(memcacheKey);
if (memcacheResult != null) {
result = (GetAccessTokenResult) memcacheResult;
} else {
result = getAccessTokenUncached(scopes);
Date memcacheExpiration = new Date(result.getExpirationTime().getTime() - 300000);
memcache.put(memcacheKey, result, Expiration.onDate(memcacheExpiration));
}
return result;
}
