Crate noxu_txn 

Internal component of the noxu database.

This crate is published only so the noxu umbrella crate can depend on it. Use noxu (noxu = "3") in applications; depend on this crate directly only if you are extending the engine internals. Its API may change without a major version bump.

Transaction management and locking for Noxu DB.

transaction management and record-level locking with deadlock detection.

Phase 3: Lock Type System Foundation (Implemented)

• Lock types, conflict and upgrade matrices
• Lock grant types and results
• Write lock info for undo operations
• Lock statistics
• Locker hierarchy (BasicLocker, ThreadLocker, HandleLocker)

Re-exports

pub use locker::Locker;

pub use basic_locker::BasicLocker;

pub use thread_locker::ThreadLocker;

pub use handle_locker::HandleLocker;

pub use locker_factory::LockerFactory;

pub use group_commit::GroupCommit;

pub use group_commit::GroupCommitMaster;

pub use group_commit::GroupCommitReplica;

Modules

basic_locker

BasicLocker - non-transactional locker.

group_commit

Group commit interface and implementations.

handle_locker

HandleLocker - database handle locker.

locker

Base Locker trait.

locker_factory

Factory for creating lockers.

thread_locker

ThreadLocker - per-thread locker.

Structs

CompareSlot

Identifies a slot in a BIN (key + BIN node ID) for deduplication.

DeadlockDetector

Deadlock detector using waits-for graph analysis.

DummyLockManager

A no-op lock manager that always grants locks immediately.

LockAttemptResult

Result of a single lock attempt on a Lock object.

LockImpl

A Lock embodies the lock state of an LSN. It includes a set of owners and a list of waiters.

LockInfo

Information about a single lock owner or waiter.

LockManager

The LockManager manages all locks in the system.

LockResult

Result of a Locker.lock() call.

LockStats

Lock statistics counters.

RevertInfo

Revert information for a single log entry in the undo chain.

ThinLockImpl

Memory-optimized lock for the common case of a single owner with no waiters.

Txn

A Txn is the internal representation of a transaction.

TxnAbort

A TxnAbort is logged when a transaction aborts.

TxnChain

A backward traversal of a transaction’s log chain for partial rollback.

TxnCommit

A TxnCommit is logged when a transaction commits.

TxnEnd

Base type for transaction end log entries (commit/abort).

TxnManager

Manages all active transactions.

TxnStats

Transaction statistics.

UndoRecord

A single undo record produced when a transaction aborts.

WriteLockInfo

Information needed to undo write operations if a transaction aborts.

Enums

Durability

Durability policy for transaction commit.

Lock

A lock on an LSN, either thin (single owner) or full (multiple owners/waiters).

LockConflict

Result of checking whether two lock types conflict.

LockGrantType

Result of a lock attempt.

LockType

Lock types used in the transaction system.

LockUpgrade

Result of checking whether a lock can be upgraded.

TxnError

Transaction and locking errors.

TxnState

Transaction states.

Constants

NULL_TXN_ID

Null transaction ID for non-transactional lockers.

Type Aliases

TxnResult

Type alias for transaction results.