TDAT:     private void closeClient(Connection c) {
        if (c.readBuffer != null) {
            releaseBuffer(c.readBuffer);
            c.readBuffer = null;
        }
        if (c.writeBuffer != null) {
            releaseBuffer(c.writeBuffer);
            c.writeBuffer = null;
        }
        try { c.close(); } catch (Exception dummy) {}
    }
 COM: <s> a helper method to close client if connection was </s>