Columnar object mutation log

- Log transaction writes in parallel arrays instead of mutation records
- Replay source plans straight from their packed cells without decoding records
- Build source plans from a log slice
- Journal commit originals in a packed-key set instead of a linked map
- Buffer cave object writes in parallel arrays
- Drop the now-unused import in the runner

core/src/test/java/art/arcane/iris/generation/mantle/MutationLogTest.java

@@ -0,0 +1,81 @@
+package art.arcane.iris.generation.mantle;
+
+import art.arcane.iris.testsupport.KeyedBlockState;
+import art.arcane.volmlib.nativelib.terrain.NativeBlockState;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertThrows;
+import static org.junit.Assert.assertTrue;
+
+public class MutationLogTest {
+    @Test
+    public void logKeepsPositionsValuesAndFlagsInOrder() {
+        NativeBlockState state = new KeyedBlockState("minecraft:stone");
+        MutationLog log = MutationLog.of(List.of(
+                new ObjectDestinationTransaction.SetMutation(new ObjectDestinationTransaction.DataKey(3, 70, -2, String.class), "marker", true),
+                new ObjectDestinationTransaction.CustomBlockMutation(new ObjectDestinationTransaction.DataKey(-17, 4, 40, NativeBlockState.class), state, false)));
+        for (int index = 0; index < 100; index++) {
+            log.add(index, index + 1, -index, "grow" + index, (index & 1) == 0, (index & 2) == 0);
+        }
+
+        assertEquals(102, log.size());
+        assertEquals(3, log.x(0));
+        assertEquals(70, log.y(0));
+        assertEquals(-2, log.z(0));
+        assertEquals("marker", log.value(0));
+        assertFalse(log.custom(0));
+        assertTrue(log.canopy(0));
+        assertSame(String.class, log.type(0));
+        assertSame(state, log.value(1));
+        assertTrue(log.custom(1));
+        assertFalse(log.canopy(1));
+        assertSame(NativeBlockState.class, log.type(1));
+        assertEquals(99, log.x(101));
+        assertEquals("grow99", log.value(101));
+        assertFalse(log.custom(101));
+        assertTrue(log.canopy(98));
+        assertFalse(log.canopy(100));
+    }
+
+    @Test
+    public void mismatchedMutationTypesAreRejected() {
+        assertThrows(IllegalArgumentException.class, () -> MutationLog.of(List.of(
+                new ObjectDestinationTransaction.SetMutation(new ObjectDestinationTransaction.DataKey(0, 4, 0, Integer.class), "text", false))));
+    }
+
+    @Test
+    public void planSlicesMatchThePlanBuiltFromTheSameMutations() {
+        MutationLog log = new MutationLog();
+        List<ObjectDestinationTransaction.Mutation> tail = new ArrayList<>();
+        for (int index = 0; index < 64; index++) {
+            int x = (index * 7) - 30;
+            int y = 4 + index;
+            int z = (index * 5) - 20;
+            String value = "value" + (index % 9);
+            boolean canopy = index % 4 == 0;
+            log.add(x, y, z, value, false, canopy);
+            if (index >= 10) {
+                tail.add(new ObjectDestinationTransaction.SetMutation(new ObjectDestinationTransaction.DataKey(x, y, z, String.class), value, canopy));
+            }
+        }
+        ObjectSourcePlan sliced = new ObjectSourcePlan(log, 10, List.of());
+        ObjectSourcePlan expected = new ObjectSourcePlan(tail);
+
+        assertEquals(expected.destinationCount(), sliced.destinationCount());
+        int total = 0;
+        for (int chunkX = -3; chunkX <= 30; chunkX++) {
+            for (int chunkZ = -3; chunkZ <= 30; chunkZ++) {
+                List<ObjectDestinationTransaction.Mutation> mutations = sliced.mutationsFor(chunkX, chunkZ);
+                assertEquals(expected.mutationsFor(chunkX, chunkZ), mutations);
+                total += mutations.size();
+            }
+        }
+        assertEquals(54, total);
+    }
+}