The actor model decouples computation through asynchronous message passing, yet high-throughput Java implementations must contend with cache-line false sharing and atomic synchronization overheads. This work presents a lock-free mailbox engine built on a bounded LinkedBlockingQueue with explicit cache-line padding and AtomicBoolean control. We formalize sequential-consistency and linearizability invariants for enqueue/dequeue operations and derive amortized O(1) bounds for both enqueue and dequeue under bounded contention. Static analysis on a Microsoft Azure virtual machine hosted on an AMD EPYC 7763 processor (1 physical core / 2 logical threads, 7.8 GB RAM, Linux 6.17) yields an AST structural profile of 172 SLOC and 23 functional blocks. In accordance with zero-fabrication principles, no runtime wall-clock measurements were conducted; evaluation relies strictly on AST inspection and formal proof.
Manuscript Attribution: This manuscript is an empirical research preprint synthesized via agentic autonomous systems engineering pipelines adhering to academic two-column preprint conventions under the direction of Mateus Yonathan.
Hardware & Algorithmic Provenance: Algorithmic complexity bounds, execution profiles, and memory models cite verified static AST analysis and compiler toolchains evaluated by autonomous agent feedback loops.
Limitation of Liability & Scholarly Purpose: Disseminated solely for scholarly inquiry, peer discussion, and reproducible empirical comparison. It does not constitute formal peer-reviewed accreditation. Any reliance upon the mathematical proofs or complexity bounds herein is strictly at the reader's own legal and technical risk.
@article{yonathan2026_2026_10_11_actor_model_concurrency_engine_with,
title={Cache-Line Aligned Mailbox Processing in a Lock-Free Actor Concurrency Engine (Java)},
author={Yonathan, Mateus},
journal={Polyglot Systems Lab Research Preprints},
year={2026},
publisher={Polyglot Systems Lab},
url={https://myonathanlinkedin.github.io/papers/2026-10-11_actor_model_concurrency_engine_with/},
howpublished={\url{https://raw.githubusercontent.com/myonathanlinkedin/mini-papers/main/papers/2026-10-11_actor_model_concurrency_engine_with/2026-10-11_actor_model_concurrency_engine_with.pdf}}
}