Fix error accessing world data folder

.github/workflows/pull_request.yml

@@ -6,8 +6,33 @@ on:
 jobs:
   run-ci:
     uses: Jikoo/PlanarActions/.github/workflows/ci_maven.yml@master
-  store-dependabot-pr-data:
-    if: "github.actor == 'dependabot[bot]' && github.event_name == 'pull_request'"
-    uses: Jikoo/PlanarActions/.github/workflows/pr_automerge_prep.yml@master
-    with:
-      pr-number: ${{ github.event.number }}
+  approve-and-merge-dependabot:
+    if: "github.event_name == 'pull_request' && github.event.pull_request.user.login == 'dependabot[bot]'"
+    needs: [ "run-ci" ]
+    runs-on: "ubuntu-latest"
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      # Always approve PRs from Dependabot.
+      - name: Approve
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+
+      # Fetch Dependabot metadata for finer decisionmaking later.
+      - name: Fetch Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@21025c705c08248db411dc16f3619e6b5f9ea21a
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+
+      # Enable auto-merge for the PR.
+      # Auto-merge is used rather than a direct merge so that any other required checks can pass.
+      - name: Enable auto-merge for minor/patch updates
+        if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}

src/main/java/com/github/jikoo/regionerator/DeletionRunnable.java

@@ -23,11 +23,14 @@
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
 import java.util.concurrent.Phaser;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.logging.Level;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * Runnable for checking and deleting chunks and regions.
@@ -60,18 +63,36 @@ public void run() {
 		if (world == null) {
 			throw new IllegalStateException("Cannot reuse deletion runnable!");
 		}
-		world.getRegions().forEach(this::handleRegion);
+
+		Future<Stream<RegionInfo>> regionsFuture = plugin.getServer().getScheduler().callSyncMethod(plugin, world::getRegions);
+
+		Stream<RegionInfo> regions = null;
+		try {
+			// Fetch region info on the main thread. Getting data folder may throw a CME otherwise.
+			regions = regionsFuture.get();
+		} catch (InterruptedException | ExecutionException e) {
+			plugin.getLogger().severe("Unable to access world data!");
+			plugin.getLogger().log(Level.SEVERE, "Error accessing world data on main thread", e);
+		}
+
+		if (regions != null) {
+			regions.forEach(this::handleRegion);
+		}
+
 		// Release world reference.
 		world = null;
 		plugin.getLogger().info("Deletion cycle complete for " + getRunStats());
 		nextRun.set(System.currentTimeMillis() + plugin.config().getCycleDelayMillis());
+
+		// If configured to remember cycle delays across restarts, do post-run callback on the main thread.
 		if (plugin.config().isRememberCycleDelay()) {
 			try {
 				plugin.getServer().getScheduler().runTask(plugin, () -> plugin.finishCycle(this));
 			} catch (IllegalPluginAccessException e) {
 				// Plugin disabling, odds are on that we were mid-cycle. Don't update finish time.
 			}
 		}
+
 		phaser.arriveAndDeregister();
 	}