Trait VnodeCountCompat

pub trait VnodeCountCompat {
    // Required method
    fn vnode_count_inner(&self) -> VnodeCount;

    // Provided method
    fn vnode_count(&self) -> usize { ... }
}

A trait for accessing the vnode count field with backward compatibility.

maybe_?

The reason why there’s a maybe_ prefix on the protobuf field is that, a getter method with the same name as the field will be generated for prost structs. Directly naming it vnode_count will lead to the method vnode_count() returning 0 when the field is unset, which can be misleading sometimes.

Instead, we name the field as maybe_vnode_count and provide the method vnode_count through this trait, ensuring that backward compatibility is handled properly.

Required Methods

fn vnode_count_inner(&self) -> VnodeCount

Get the maybe_vnode_count field.

Provided Methods

fn vnode_count(&self) -> usize

Returns the vnode count if it’s set. Otherwise, returns VirtualNode::COUNT_FOR_COMPAT for distributed tables/fragments, and 1 for singleton tables/fragments, for backward compatibility. Panics if the field is a placeholder.

See the documentation on the field of the implementing type for more details.

Implementations on Foreign Types

impl VnodeCountCompat for StorageTableDesc

fn vnode_count_inner(&self) -> VnodeCount

impl VnodeCountCompat for Table

fn vnode_count_inner(&self) -> VnodeCount

Implementors