mentat/transaction/src/metadata.rs

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/// Connection metadata required to query from, or apply transactions to, a Mentat store.
///
/// Owned data for the volatile parts (generation and partition map), and `Arc` for the infrequently
/// changing parts (schema) that we want to share across threads.
///
/// See https://github.com/mozilla/mentat/wiki/Thoughts:-modeling-db-conn-in-Rust.
use std::sync::Arc;
use mentat_core::Schema;
use mentat_db::PartitionMap;
use mentat_db::cache::SQLiteAttributeCache;
pub struct Metadata {
pub generation: u64,
pub partition_map: PartitionMap,
pub schema: Arc<Schema>,
pub attribute_cache: SQLiteAttributeCache,
}
impl Metadata {
// Intentionally not public.
pub fn new(
generation: u64,
partition_map: PartitionMap,
schema: Arc<Schema>,
cache: SQLiteAttributeCache,
) -> Metadata {
Metadata {
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generation,
partition_map,
schema,
attribute_cache: cache,
}
}
}