private void preOp(boolean setTL) {
    if (proxyCache.isClosed()) {
      throw proxyCache.getCacheClosedException("Cache is closed for this user.");
    }
    if (setTL) {
      UserAttributes.userAttributes.set(proxyCache.getUserAttributes());
    }
  }
A wrapper class over an actual QueryService instance. This is used when the
multiuser-authentication attribute is set to true.

@see ProxyCache
@since GemFire 6.5
geode-core/src/main/java/org/apache/geode/cache/query/internal/ProxyQueryService.java