Fixed the bug that opfromthestart found, reloading now works

src/main/java/ru/windcorp/progressia/test/region/Region.java

@@ -51,7 +51,9 @@ public class Region {
 	private static final int MAX_CHUNK_SIZE = 1024 * 1024;
 	private static final int SECTOR_SIZE = MAX_CHUNK_SIZE / 256;
 	
-	private static final int HEADER_SIZE = Integer.BYTES * REGION_DIAMETER * REGION_DIAMETER * REGION_DIAMETER;
+	private static final int DEFINITION_SIZE = Integer.BYTES + 1;
+
+	private static final int HEADER_SIZE = DEFINITION_SIZE * REGION_DIAMETER * REGION_DIAMETER * REGION_DIAMETER;
 
 	private final RandomAccessFile file;
 
@@ -151,7 +153,7 @@ public class Region {
 
 	public void save(DefaultChunkData chunk, Server server) throws IOException {
 		Vec3i pos = TestWorldDiskIO.getInRegionCoords(chunk.getPosition());
-		int definitionOffset = Integer.BYTES * (pos.z + REGION_DIAMETER * (pos.y + REGION_DIAMETER * pos.x));
+		int definitionOffset = DEFINITION_SIZE * (pos.z + REGION_DIAMETER * (pos.y + REGION_DIAMETER * pos.x));
 
 		if (!hasOffset(pos)) {
 			allocateChunk(definitionOffset, pos);
@@ -182,7 +184,7 @@ public class Region {
 		file.seek(HEADER_SIZE + SECTOR_SIZE * dataOffset);
 		file.write(buffer);
 
-		file.seek(definitionOffset + Integer.BYTES - 1);
+		file.seek(definitionOffset + Integer.BYTES);
 
 		int sectors = buffer.length / SECTOR_SIZE + 1;
 		file.write(sectors);

src/main/java/ru/windcorp/progressia/test/region/TestWorldDiskIO.java

@@ -55,7 +55,7 @@ public class TestWorldDiskIO implements WorldContainer {
 		return Coordinates.convertGlobalToInCell(BITS_IN_CHUNK_COORDS, chunkCoords, null);
 	}
 
-	static final Logger LOG = LogManager.getLogger();
+	static final Logger LOG = LogManager.getLogger("TestWorldDiskIO");
 
 	private final Path path;
 	private final ChunkMap<Region> regions = ChunkMaps.newHashMap();
@@ -74,6 +74,7 @@ public class TestWorldDiskIO implements WorldContainer {
 
 			Region region = getRegion(chunkPos, false);
 			if (region == null) {
+				debug("Could not load chunk {} {} {}: region did not load", chunkPos);
 				return null;
 			}
 
@@ -81,12 +82,7 @@ public class TestWorldDiskIO implements WorldContainer {
 			return result;
 
 		} catch (IOException | DecodingException e) {
-			LOG.warn(
+			warn("Failed to load chunk {} {} {}", chunkPos);
-				"Failed to load chunk {} {} {}",
-				chunkPos.x,
-				chunkPos.y,
-				chunkPos.z
-			);
 			e.printStackTrace();
 			return null;
 		}
@@ -99,22 +95,11 @@ public class TestWorldDiskIO implements WorldContainer {
 		}
 
 		try {
-			LOG.debug(
+			debug("Saving chunk {} {} {}", chunk.getPosition());
-				"Saving {} {} {}",
-				chunk.getPosition().x,
-				chunk.getPosition().y,
-				chunk.getPosition().z
-			);
-
 			Region region = getRegion(chunk.getPosition(), true);
 			region.save(chunk, server);
 		} catch (IOException e) {
-			LOG.warn(
+			warn("Failed to save chunk {} {} {}", chunk.getPosition());
-				"Failed to save chunk {} {} {}",
-				chunk.getPosition().x,
-				chunk.getPosition().y,
-				chunk.getPosition().z
-			);
 			e.printStackTrace();
 		}
 	}
@@ -128,21 +113,17 @@ public class TestWorldDiskIO implements WorldContainer {
 
 		Region region = regions.get(regionCoords);
 		if (region == null) {
+			debug("Region {} {} {} is not loaded, loading", regionCoords);
 
-			Path path = getPath().resolve(
+			Path path = getRegionPath(regionCoords);
-				String.format(
-					FILE_NAME_FORMAT,
-					regionCoords.x,
-					regionCoords.y,
-					regionCoords.z
-				)
-			);
 
-			if (!Files.exists(path) && !createIfMissing) {
+			if (!createIfMissing && !Files.exists(path)) {
+				debug("Region {} {} {} does not exist on disk, aborting load", regionCoords);
 				return null;
 			}
 
 			region = openRegion(path, regionCoords);
+			debug("Region {} {} {} loaded", regionCoords);
 		}
 
 		return region;
@@ -171,6 +152,17 @@ public class TestWorldDiskIO implements WorldContainer {
 		return path;
 	}
 	
+	private Path getRegionPath(Vec3i regionPos) {
+		return getPath().resolve(
+			String.format(
+				FILE_NAME_FORMAT,
+				regionPos.x,
+				regionPos.y,
+				regionPos.z
+			)
+		);
+	}
+
 	@Override
 	public void close() {
 		try {
@@ -182,4 +174,14 @@ public class TestWorldDiskIO implements WorldContainer {
 		}
 	}
 	
+	private static void debug(String message, Vec3i vector) {
+		if (LOG.isDebugEnabled()) {
+			LOG.debug(message, vector.x, vector.y, vector.z);
+		}
+	}
+	
+	private static void warn(String message, Vec3i vector) {
+		LOG.warn(message, vector.x, vector.y, vector.z);
+	}
+
 }

src/main/resources/log4j2.xml

@@ -26,7 +26,10 @@
     	<Logger name="Ticker Coordinator" level="DEBUG" />
     	<Logger name="Ticker 0" level="DEBUG" />
     	-->
-    	<!-- <Logger name="TestWorldDiskIO" level="DEBUG" /> -->
+    	
+    	<!--  Uncomment to enable Region file logger debugging
+    	<Logger name="TestWorldDiskIO" level="DEBUG" />
+    	-->
     	
         <Root level="info">
             <AppenderRef ref="FileLog"  />