2.7 KiB
Instability provider runtime (Milestone 6, issue #66)
Each new Age stores an InstabilityPlan beside its frozen Instability score. The version-1 plan contains provider IDs and levels. Selection uses the saved score rounded down to a 500-point step and the Age seed. It independently walks Legacy's basic, harsh, destructive, eating, and death decks with their audited entry costs (0, 2,500, 10,000, 15,000, 20,000), shuffling each deck deterministically before paying its weighted card costs. The source card weights and default provider costs are copied from the user's local Mystcraft 0.13.7.06 InstabilityData class. This preserves Legacy's multiple-deck behavior, but does not claim byte-for-byte reproduction of its historical Java RNG state, difficulty multiplier, config overrides, or 400-chunk block profiling delay.
The saved provider IDs are independent of installed handlers. A missing optional handler leaves its ID and level intact and is skipped at runtime. A syntactically invalid saved ID or unsupported plan version fails loading explicitly; an unknown but valid ID is preserved and logged once when encountered. Disabling instability or world mutation never rewrites a saved score or provider plan. Saves from #64 with a frozen score but no provider plan are selected once from that score and Age seed, then marked dirty for persistence. Older pre-score Ages remain neutral and inert.
The server scheduler runs only for loaded rivencraft:age/* levels with a player present and an Age definition. It uses only chunks already loaded near those players, never requests a chunk, and rotates among eligible Ages when the per-tick cap is reached. Configuration bounds the cooldown (minimum 20 ticks), active Ages, handlers and actions per Age, effective provider level, and examined loaded chunks. A handler must claim a shared action permit before each effect. A throwing handler is logged and quarantined temporarily without stopping the server. World-mutating handlers are enabled by default to match Legacy; the setting can still disable them. These limits are guards for upcoming providers, not proof that an arbitrary third-party handler cannot misuse world APIs.
Issue #67 registers the non-world-mutating potion handlers; see status-effect policy. Issue #68 adds configurable colored decay, enabled by default for newly generated configs. Other world hazards remain for #69–#70. The runtime rejects Overworld and preview dimension IDs; its player requirement excludes unattended snapshot chunk loaders. GameTests cover deterministic selection, save round-trips, score-only migration, unknown IDs, scope checks, fair admission, and action caps.