synchronized (lock) {
            SftpHost sftpHost = new SftpHost(uri, credentials);
            return acquireClient(sftpHost);
        }
    }

    private LockableSftpClient acquireClient(SftpHost sftpHost) {
        return idleClients.containsKey(sftpHost) ? reuseExistingOrCreateNewClient(sftpHost) : createNewClient(sftpHost);
    }