perf: avoid block snapshots in inventory click and close handlers by XxFran10xX · Pull Request #38 · TF-Minecraft/Thievery

XxFran10xX · 2026-10-10T19:49:02Z

Problem

At 16:27 on 2026-10-10, Paper's watchdog on Main caught the server thread stuck in StealManager.getStealGuiHolder (StealManager.java:115). Every inventory click and close ran inventory.getHolder() in several Thievery listeners. For a block inventory that copies the whole block state, so a barrel reloaded all of its items just to learn it was not a Thievery menu. This is the same kind of slowdown #25 fixed for hoppers.

Changes

StealManager.getStealGuiHolder (click, close, and every tick per open steal session), the loadout click/close handlers, and the steal title refresh now use Paper's non-snapshot getHolder(false).
ContainerManager.onInventoryClick uses getHolder(false) / getLeftSide(false). It also checks the cached owner (from perf: avoid block snapshots and disk reads in hopper lock checks #25) before reading the container's data file, so takes from unowned containers skip the disk read.
Tests: MockBukkit does not implement getHolder(boolean), so tests that use its inventories wrap them in TestInventories.withHolderLookup. Without that, 10 tests were silently skipped and the coverage gate failed. A new test checks that an unowned container click reads neither the data file nor a block snapshot.

Testing

mvn clean verify: 822 tests, 0 skipped, 100% coverage gate passes.
TFMCDev01 bot test (~/holder-test/test.js on the host), 23/23 checks:
- Barrel and double chest: the owner claims and later privates the container while a thief has it open. The thief's take alerts opted-in staff, and the double chest reports the left-side location.
- Loadout GUI: a category click toggles, the click is cancelled, and confirm saves the category.
- Robbery GUI: accept opens it, a click moves one ingot from victim to robber, and closing the GUI ends the session.
- No Thievery exceptions or warnings in latest.log.

🤖 Generated with Claude Code

Every inventory click and close ran getHolder() in several Thievery listeners. For a block inventory that copies the whole block state, so a barrel reloaded all of its items just to learn it was not a Thievery menu. Paper's watchdog caught the server thread in StealManager.getStealGuiHolder on Main. Use the non-snapshot getHolder(false)/getLeftSide(false) lookups in the steal, loadout and container click paths, and the per-tick steal title refresh. Container clicks also check the cached owner before reading the container's data file, so unowned containers skip the disk read. MockBukkit does not implement getHolder(boolean), so tests that use its inventories wrap them in TestInventories.withHolderLookup. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai · 2026-10-10T19:49:13Z

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📒 Files selected for processing (2)

src/main/java/net/tfminecraft/thievery/door/ContainerManager.java
src/test/java/net/tfminecraft/thievery/door/ContainerManagerTest.java

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📝 Summary

Summary by CodeRabbit

Performance
- Reduced unnecessary container data loading when interacting with unowned containers.
- Improved inventory handling to avoid creating block-state snapshots during holder lookups.
Bug Fixes
- Prevented errors when interacting with double chests whose left side is not a chest.
- Improved reliability when checking inventory holders and handling container interactions.

Walkthrough

Inventory handlers now use getHolder(false) to retrieve inventory holders. Container clicks also return before loading container data when the cached owner is null and safely handle a double chest whose left holder is not a chest. Tests cover these paths and update inventory fixtures.

Changes

Inventory holder lookups

Layer / File(s)	Summary
Container click handling `src/main/java/net/tfminecraft/thievery/door/ContainerManager.java`, `src/test/java/net/tfminecraft/thievery/TestInventories.java`, `src/test/java/net/tfminecraft/thievery/door/ContainerManagerTest.java`	Container clicks use `getHolder(false)`, handle a non-chest holder on the left side of a double chest, and check cached ownership before loading container data. Tests cover these cases and provide inventory fixtures for holder lookup.
Loadout and theft inventory lookups `src/main/java/net/tfminecraft/thievery/player/InventoryManager.java`, `src/main/java/net/tfminecraft/thievery/steal/StealGui.java`, `src/main/java/net/tfminecraft/thievery/steal/StealManager.java`, `src/test/java/net/tfminecraft/thievery/player/InventoryManagerTest.java`, `src/test/java/net/tfminecraft/thievery/steal/*`	Loadout and theft inventory handlers use `getHolder(false)`. Tests configure that overload and use inventory fixtures that support holder lookup.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: ryanbarlow97

Merge Risk: ⚪ Minimal · up to 8d412

The changed handlers preserve custom loadout and theft GUI holders, and normal container-owner updates keep the cache current. No actionable merge-blocking risk was established.

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XxFran10xX · 2026-10-10T19:49:13Z

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Inline comments:
Review comments at
@src/main/java/net/tfminecraft/thievery/door/ContainerManager.java:
- Line 317: Validate the result of getLeftSide(false) in the double-chest click
path before casting or reading its location: use the instanceof Chest check from
getOwnerFromHolder and return when the side is null or not a Chest.

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Configuration used: Organization UI
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📥 Commits

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📒 Files selected for processing (10)

src/main/java/net/tfminecraft/thievery/door/ContainerManager.java
src/main/java/net/tfminecraft/thievery/player/InventoryManager.java
src/main/java/net/tfminecraft/thievery/steal/StealGui.java
src/main/java/net/tfminecraft/thievery/steal/StealManager.java
src/test/java/net/tfminecraft/thievery/TestInventories.java
src/test/java/net/tfminecraft/thievery/door/ContainerManagerTest.java
src/test/java/net/tfminecraft/thievery/player/InventoryManagerTest.java
src/test/java/net/tfminecraft/thievery/steal/StealGuiTest.java
src/test/java/net/tfminecraft/thievery/steal/StealManagerTest.java
src/test/java/net/tfminecraft/thievery/steal/StealReferencesTest.java

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

XxFran10xX · 2026-10-10T20:07:00Z

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XxFran10xX · 2026-10-10T20:39:54Z

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XxFran10xX · 2026-10-10T21:10:07Z

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coderabbitai Bot requested changes Oct 10, 2026

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Comment thread src/main/java/net/tfminecraft/thievery/door/ContainerManager.java Outdated

fix: ignore clicks on a double chest whose left half is not a chest

8d412b2

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai Bot approved these changes Oct 10, 2026

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XxFran10xX merged commit d804de0 into main Oct 10, 2026
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XxFran10xX deleted the perf/steal-gui-holder-no-snapshot branch October 10, 2026 21:17

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perf: avoid block snapshots in inventory click and close handlers - #38

perf: avoid block snapshots in inventory click and close handlers#38
XxFran10xX merged 2 commits into
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perf/steal-gui-holder-no-snapshot

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