Add tracing for unflushed EditSessions

worldedit-core/src/main/java/com/sk89q/worldedit/TracedEditSession.java

@@ -0,0 +1,49 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit;
+
+import com.sk89q.worldedit.event.extent.EditSessionEvent;
+import com.sk89q.worldedit.extent.inventory.BlockBag;
+import com.sk89q.worldedit.util.eventbus.EventBus;
+import com.sk89q.worldedit.world.World;
+
+import java.util.logging.Level;
+
+public class TracedEditSession extends EditSession {
+
+    TracedEditSession(EventBus eventBus, World world, int maxBlocks, BlockBag blockBag, EditSessionEvent event) {
+        super(eventBus, world, maxBlocks, blockBag, event);
+    }
+
+    private final Throwable stacktrace = new Throwable("Creation trace.");
+
+    @Override
+    protected void finalize() throws Throwable {
+        if (!isQueueEnabled() && !isBatchingChunks()) {
+            return;
+        }
+
+        if (getChunkBatchingExtent().commitRequired() || getReorderExtent().commitRequired()) {
+            WorldEdit.logger.warning("####### LEFTOVER BUFFER BLOCKS DETECTED #######");
+            WorldEdit.logger.warning("This means that some code did not flush their EditSession.");
+            WorldEdit.logger.log(Level.WARNING, "Here is a stacktrace from the creation of this EditSession:", stacktrace);
+        }
+    }
+}