qubit-cas 0.3.4

Typed compare-and-swap executor with retry-aware conflict handling
Documentation 
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/*******************************************************************************
 *
 *    Copyright (c) 2025 - 2026.
 *    Haixing Hu, Qubit Co. Ltd.
 *
 *    All rights reserved.
 *
 ******************************************************************************/
//! Built-in CAS preset constants.

use std::time::Duration;

use qubit_retry::constants::DEFAULT_RETRY_MAX_ATTEMPTS;

/// Default maximum attempts inherited from `qubit-retry`.
pub const DEFAULT_CAS_MAX_ATTEMPTS: u32 = DEFAULT_RETRY_MAX_ATTEMPTS;

/// Maximum attempts for the contention-adaptive strategy.
pub const CONTENTION_ADAPTIVE_MAX_ATTEMPTS: u32 = 1000;

/// Initial retry delay for the contention-adaptive strategy.
pub const CONTENTION_ADAPTIVE_INITIAL_DELAY: Duration = Duration::from_millis(50);

/// Maximum retry delay for the contention-adaptive strategy.
pub const CONTENTION_ADAPTIVE_MAX_DELAY: Duration = Duration::from_secs(30);

/// Cumulative user operation elapsed-time budget for the contention-adaptive strategy.
pub const CONTENTION_ADAPTIVE_MAX_ELAPSED: Duration = Duration::from_secs(60);

/// Monotonic total retry-flow elapsed-time ceiling for the contention-adaptive strategy.
///
/// Includes user operation time, retry sleeps, and control-path listener work. The
/// value is above [`CONTENTION_ADAPTIVE_MAX_ELAPSED`]
/// so exponential backoff can use part of the wall-time budget.
pub const CONTENTION_ADAPTIVE_MAX_TOTAL_ELAPSED: Duration = Duration::from_secs(180);

/// Jitter factor for the contention-adaptive strategy.
pub const CONTENTION_ADAPTIVE_JITTER_FACTOR: f64 = 0.25;

/// Maximum attempts for the latency-first strategy.
pub const LATENCY_FIRST_MAX_ATTEMPTS: u32 = 100;

/// Cumulative user operation elapsed-time budget for the latency-first strategy.
pub const LATENCY_FIRST_MAX_ELAPSED: Duration = Duration::from_secs(5);

/// Maximum attempts for the reliability-first strategy.
pub const RELIABILITY_FIRST_MAX_ATTEMPTS: u32 = 5000;

/// Initial retry delay for the reliability-first strategy.
pub const RELIABILITY_FIRST_INITIAL_DELAY: Duration = Duration::from_secs(1);

/// Maximum retry delay for the reliability-first strategy.
pub const RELIABILITY_FIRST_MAX_DELAY: Duration = Duration::from_secs(300);

/// Cumulative user operation elapsed-time budget for the reliability-first strategy.
pub const RELIABILITY_FIRST_MAX_ELAPSED: Duration = Duration::from_secs(600);

/// Monotonic total retry-flow elapsed-time ceiling for the reliability-first strategy.
///
/// Set above [`RELIABILITY_FIRST_MAX_ELAPSED`] so long
/// exponential backoff windows can still fit under a hard end-to-end cap.
pub const RELIABILITY_FIRST_MAX_TOTAL_ELAPSED: Duration = Duration::from_secs(900);

/// Jitter factor for the reliability-first strategy.
pub const RELIABILITY_FIRST_JITTER_FACTOR: f64 = 0.1;