Reachability Guided Resource Reclamation¶

Reclaim resources only after proving they are unreachable from every declared live root and protecting in-flight or externally retained dependencies.

Overview¶

Reclaim resources only after proving they are unreachable from every declared live root and protecting in-flight or externally retained dependencies.

Structural problem¶

Resources accumulate after their useful lifetime because ownership is distributed, references are indirect, and deletion based on age or local inactivity can destroy still-reachable state.

Intervention logic¶

Declare authoritative roots, model reference edges, compute reachable closure, quarantine unreachable candidates, protect in-flight and finalization states, reclaim under synchronization rules, and preserve audit plus rollback evidence.

Components and mechanisms¶

The required components make the recurring structure explicit; mechanisms are selected as domain-specific implementation machinery. The distinction is preserved in the accompanying stub files.

Boundaries and review¶

The draft remains provisional. Reconciliation should test aliases, normalize component and mechanism slugs, and verify that no accepted neighbor already preserves the same load-bearing intervention structure.

Common Mechanisms¶

concurrent_collection_barrier
cycle_detection_pass
dry_run_reclamation_report
generational_collection
lease_expiry_sweep
reachability_graph_visualization
reference_counting
tombstone_then_delete
tracing_mark_sweep_cycle
weak_reference_registry

Compression statement¶

When resources accumulate after their useful lifetime because ownership is distributed, references are indirect, and deletion based on age or local inactivity can destroy still-reachable state., declare authoritative roots, model reference edges, compute reachable closure, quarantine unreachable candidates, protect in-flight and finalization states, reclaim under synchronization rules, and preserve audit plus rollback evidence.

Canonical formula: reachability_guided_resource_reclamation = scope + evidence + governed transformation + validation + feedback + recovery

Abstractions this archetype builds on — directly (a source ingredient) or as a related pattern. Links follow the typed catalog namespace.

Built directly on (4)

Connectedness: A whole that cannot be split into parts with no relation crossing between them.
Garbage Collection: Reclaiming resources that nothing reachable from a declared root can still use.
Network: Models interactions between components.
Resource Management: Allocation of finite assets.

Also references 12 related abstractions

Boundedness: Values remain within limits.
Conservation Event: A deliberate, bounded intervention that arrests or reverses a system's decay away from a reference state judged worth preserving.
Data Structure: An arrangement of information that makes some operations cheap at the structural cost of others.
Deadlock: Mutual blocking processes.
Garbage In, Garbage Out: The quality of a transformation's output is bounded above by the quality of its inputs; no downstream sophistication can repair defects already present in the input.
Maintenance: Sustained preventive work that keeps a system's intended function intact against inevitable degradation, acting ahead of failure rather than repairing after it.
Native-Category Flattening: A source system's own partition of the world is silently collapsed when an external observer recodes it into a foreign taxonomy without first preserving the source partition, destroying distinctions the downstream analysis would have needed and that recoded labels cannot recover.
Observability: Infer internal state externally.
Provenance: A documented, traceable record of an entity's origin and successive custody transfers that establishes authenticity and assigns accountability by linking present state back to first known state.
State and State Transition: Captures system condition and evolution.

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Variants¶

Narrower or domain-specific specializations that share this archetype's core structure. Recognized variants are established; candidate variants are provisional.

Tracing Reclamation Variant · subtype · recognized

A Reachability-Guided Resource Reclamation subtype distinguished by global rooted reachability is computed.

Distinct from parent: This subtype foregrounds global rooted reachability is computed.
Use when: The case is distinguished by global rooted reachability is computed; The parent intervention structure still applies.
Typical domains: computer science, data lifecycle management, records management, operations
Common mechanisms: tracing mark sweep cycle, reference counting, cycle detection pass, generational collection

Reference-Counting Variant · subtype · recognized

A Reachability-Guided Resource Reclamation subtype distinguished by liveness is approximated by retaining-reference counts.

Distinct from parent: This subtype foregrounds liveness is approximated by retaining-reference counts.
Use when: The case is distinguished by liveness is approximated by retaining-reference counts; The parent intervention structure still applies.
Typical domains: computer science, data lifecycle management, records management, operations
Common mechanisms: tracing mark sweep cycle, reference counting, cycle detection pass, generational collection

Lease-Based Reclamation Variant · subtype · recognized

A Reachability-Guided Resource Reclamation subtype distinguished by time-bounded renewable claims define liveness.

Distinct from parent: This subtype foregrounds time-bounded renewable claims define liveness.
Use when: The case is distinguished by time-bounded renewable claims define liveness; The parent intervention structure still applies.
Typical domains: computer science, data lifecycle management, records management, operations
Common mechanisms: tracing mark sweep cycle, reference counting, cycle detection pass, generational collection

Near names: Rooted Reachability Reclamation, Garbage Collection Governance, Liveness-Based Resource Recovery.