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//! Database configuration.
//!
use noxu_tree::KeyComparatorFn;
/// A persisted-identity + comparison-function pair threaded from the public
/// `noxu_db::Comparator` down to `DatabaseImpl`.
///
/// The `identity` is the stable string persisted in the database record (the
/// NameLN data) and re-checked at open; the `func` is the actual comparison
/// closure threaded into the `Tree`. JE `DatabaseImpl.btreeComparator` plus
/// the persisted `btreeComparatorBytes` (the serialized class name).
#[derive(Clone)]
pub struct ConfigComparator {
/// Stable identity persisted in the database record.
pub identity: String,
/// The comparison closure threaded into the tree.
pub func: KeyComparatorFn,
}
impl std::fmt::Debug for ConfigComparator {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("ConfigComparator")
.field("identity", &self.identity)
.finish()
}
}
/// Configuration for a database.
///
///
#[derive(Debug, Clone)]
pub struct DatabaseConfig {
/// Allow database creation if it doesn't exist.
pub allow_create: bool,
/// Enable sorted duplicates.
pub sorted_duplicates: bool,
/// Enable key prefixing compression.
pub key_prefixing: bool,
/// Database is temporary (not persisted).
pub temporary: bool,
/// Database operations are transactional.
pub transactional: bool,
/// Database is read-only.
pub read_only: bool,
/// Maximum entries per node.
pub node_max_entries: i32,
/// Deferred write: skip WAL logging; flush only at eviction/checkpoint.
///
///
pub deferred_write: bool,
/// User-supplied B-tree key comparator (DBI-14).
///
/// JE `DatabaseImpl.btreeComparator`. `None` = unsigned-byte order.
pub btree_comparator: Option<ConfigComparator>,
/// User-supplied duplicate-data comparator (DBI-14).
///
/// JE `DatabaseImpl.duplicateComparator`.
pub duplicate_comparator: Option<ConfigComparator>,
/// JE `DatabaseConfig.overrideBtreeComparator`: replace a persisted
/// comparator instead of rejecting a mismatch.
pub override_btree_comparator: bool,
/// JE `DatabaseConfig.overrideDuplicateComparator`.
pub override_duplicate_comparator: bool,
}
impl Default for DatabaseConfig {
fn default() -> Self {
DatabaseConfig {
allow_create: false,
sorted_duplicates: false,
key_prefixing: false,
temporary: false,
transactional: false,
read_only: false,
node_max_entries: 128,
deferred_write: false,
btree_comparator: None,
duplicate_comparator: None,
override_btree_comparator: false,
override_duplicate_comparator: false,
}
}
}
impl DatabaseConfig {
/// Creates a new DatabaseConfig with default values.
pub fn new() -> Self {
Self::default()
}
/// Sets the allow_create flag.
pub fn set_allow_create(&mut self, allow_create: bool) -> &mut Self {
self.allow_create = allow_create;
self
}
/// Sets the sorted_duplicates flag.
pub fn set_sorted_duplicates(
&mut self,
sorted_duplicates: bool,
) -> &mut Self {
self.sorted_duplicates = sorted_duplicates;
self
}
/// Sets the key_prefixing flag.
pub fn set_key_prefixing(&mut self, key_prefixing: bool) -> &mut Self {
self.key_prefixing = key_prefixing;
self
}
/// Sets the temporary flag.
pub fn set_temporary(&mut self, temporary: bool) -> &mut Self {
self.temporary = temporary;
self
}
/// Sets the transactional flag.
pub fn set_transactional(&mut self, transactional: bool) -> &mut Self {
self.transactional = transactional;
self
}
/// Sets the read_only flag.
pub fn set_read_only(&mut self, read_only: bool) -> &mut Self {
self.read_only = read_only;
self
}
/// Sets the maximum entries per node.
pub fn set_node_max_entries(&mut self, max: i32) -> &mut Self {
self.node_max_entries = max;
self
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_default() {
let config = DatabaseConfig::default();
assert!(!config.allow_create);
assert!(!config.sorted_duplicates);
assert!(!config.key_prefixing);
assert!(!config.temporary);
assert!(!config.transactional);
assert!(!config.read_only);
assert_eq!(config.node_max_entries, 128);
}
#[test]
fn test_new() {
let config = DatabaseConfig::new();
assert!(!config.allow_create);
}
#[test]
fn test_setters() {
let mut config = DatabaseConfig::new();
config.set_allow_create(true);
assert!(config.allow_create);
config.set_sorted_duplicates(true);
assert!(config.sorted_duplicates);
config.set_key_prefixing(true);
assert!(config.key_prefixing);
config.set_temporary(true);
assert!(config.temporary);
config.set_transactional(true);
assert!(config.transactional);
config.set_read_only(true);
assert!(config.read_only);
config.set_node_max_entries(256);
assert_eq!(config.node_max_entries, 256);
}
#[test]
fn test_builder_pattern() {
let config = DatabaseConfig::new()
.set_allow_create(true)
.set_transactional(true)
.set_node_max_entries(512)
.clone();
assert!(config.allow_create);
assert!(config.transactional);
assert_eq!(config.node_max_entries, 512);
}
}