bool supportsDocLocking() {
        if (hasGlobalEnvironment()) {
            StorageEngine* globalStorageEngine = getGlobalEnvironment()->getGlobalStorageEngine();
            if (globalStorageEngine != NULL) {
                return globalStorageEngine->supportsDocLocking();
            }
        }

        return false;
    }
    bool isMMAPV1() {
        if (hasGlobalEnvironment()) {
            StorageEngine* globalStorageEngine = getGlobalEnvironment()->getGlobalStorageEngine();
            if (globalStorageEngine != NULL) {
                return globalStorageEngine->isMmapV1();
            }
        }

        // For the purpose of unit-tests, which were written to assume MMAP V1-like behaviour
        return true;
    }