Struct mz_adapter::session::WriteLocks

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pub struct WriteLocks {
    locks: BTreeMap<CatalogItemId, OwnedMutexGuard<()>>,
    conn_id: ConnectionId,
}
Expand description

A complete set of exclusive locks for writing to collections identified by CatalogItemIds.

To prevent deadlocks between two sessions, we do not allow acquiring a partial set of locks.

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§locks: BTreeMap<CatalogItemId, OwnedMutexGuard<()>>§conn_id: ConnectionId

Connection that currently holds these locks, used for tracing purposes only.

Implementations§

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impl WriteLocks

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pub fn builder( sources: impl IntoIterator<Item = CatalogItemId>, ) -> WriteLocksBuilder

Create a WriteLocksBuilder pre-defining all of the locks we need.

When “finishing” the builder with WriteLocksBuilder::all_or_nothing, if we haven’t acquired all of the necessary locks we drop any partially acquired ones.

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pub fn validate( self, collections: impl Iterator<Item = CatalogItemId>, ) -> Result<Self, BTreeSet<CatalogItemId>>

Validate this set of WriteLocks is sufficient for the provided collections. Dropping the currently held locks if it’s not.

Trait Implementations§

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impl Debug for WriteLocks

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Drop for WriteLocks

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fn drop(&mut self)

Executes the destructor for this type. Read more

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