improve trace logging

- Add filename for trace logs for read/write operations.

data-store/src/main/java/org/lucares/pdb/datastore/internal/DocEncoderDecoder.java

@@ -43,4 +43,8 @@ class DocEncoderDecoder implements PartitionAwareEncoderDecoder<Doc, Doc> {
 		}
 		return t;
 	}
+	
+	public byte[] getEmptyValue() {
+		return new byte[] {0};
+	}
 }

data-store/src/main/java/org/lucares/pdb/datastore/internal/PartitionAwareWrapper.java

@@ -33,4 +33,8 @@ public final class PartitionAwareWrapper<O> implements PartitionAwareEncoderDeco
 	public static <O> PartitionAwareEncoderDecoder<O, O> wrap(final EncoderDecoder<O> encoder) {
 		return new PartitionAwareWrapper<>(encoder);
 	}
+	
+	public byte[] getEmptyValue() {
+		return delegate.getEmptyValue();
+	}
 }

data-store/src/main/java/org/lucares/pdb/datastore/internal/PartitionDiskStore.java

@@ -24,7 +24,7 @@ public class PartitionDiskStore {
 		creator = partitionId -> {
 			final Path file = storageBasePath.resolve(partitionId.getPartitionId()).resolve(filename);
 			final boolean isNew = !Files.exists(file);
-			final DiskStorage diskStorage = new DiskStorage(file);
+			final DiskStorage diskStorage = new DiskStorage(file, storageBasePath);
 			if (isNew) {
 				diskStorage.ensureAlignmentForNewBlocks(BSFile.BLOCK_SIZE);
 			}
@@ -33,7 +33,7 @@ public class PartitionDiskStore {
 		supplier = partitionId -> {
 			final Path file = storageBasePath.resolve(partitionId.getPartitionId()).resolve(filename);
 			if (Files.exists(file)) {
-				return new DiskStorage(file);
+				return new DiskStorage(file, storageBasePath);
 			}
 			return null;
 		};

data-store/src/main/java/org/lucares/pdb/datastore/internal/PartitionPersistentMap.java

@@ -38,12 +38,12 @@ public class PartitionPersistentMap<K, V, P> implements AutoCloseable {
 		this.valueEncoder = valueEncoder;
 		creator = partitionId -> {
 			final Path file = storageBasePath.resolve(partitionId.getPartitionId()).resolve(filename);
-			return new PersistentMap<>(file, keyEncoder, valueEncoder);
+			return new PersistentMap<>(file, storageBasePath, keyEncoder, valueEncoder);
 		};
 		supplier = partitionId -> {
 			final Path file = storageBasePath.resolve(partitionId.getPartitionId()).resolve(filename);
 			if (Files.exists(file)) {
-				return new PersistentMap<>(file, keyEncoder, valueEncoder);
+				return new PersistentMap<>(file, storageBasePath, keyEncoder, valueEncoder);
 			}
 			return null;
 		};

data-store/src/main/java/org/lucares/pdb/datastore/internal/QueryCompletionIndex.java

@@ -164,6 +164,11 @@ public class QueryCompletionIndex implements AutoCloseable {
 
 			return new TwoTags(tagA, tagB);
 		}
+		
+		@Override
+		public byte[] getEmptyValue() {
+			return new byte[] {0,0,0,0};
+		}
 	}
 
 	private static final class EncoderTag implements EncoderDecoder<Tag> {
@@ -188,6 +193,11 @@ public class QueryCompletionIndex implements AutoCloseable {
 			return new Tag(key, value);
 		}
 
+		
+		@Override
+		public byte[] getEmptyValue() {
+			return new byte[] {0};
+		}
 	}
 
 	private static final class EncoderField implements EncoderDecoder<String> {
@@ -207,6 +217,11 @@ public class QueryCompletionIndex implements AutoCloseable {
 			final long compressedString = VariableByteEncoder.decodeFirstValue(bytes);
 			return Tags.STRING_COMPRESSOR.get((int) compressedString);
 		}
+		
+		@Override
+		public byte[] getEmptyValue() {
+			return new byte[] {0};
+		}
 	}
 
 	private final PartitionPersistentMap<TwoTags, Empty, Empty> tagToTagIndex;

data-store/src/main/java/org/lucares/pdb/datastore/internal/TagEncoderDecoder.java

@@ -56,4 +56,9 @@ class TagEncoderDecoder implements EncoderDecoder<Tag> {
 
 		return result;
 	}
+	
+	@Override
+	public byte[] getEmptyValue() {
+		return new byte[] {0};
+	}
 }

data-store/src/main/java/org/lucares/pdb/datastore/internal/TagsEncoderDecoder.java

@@ -13,4 +13,9 @@ class TagsEncoderDecoder implements EncoderDecoder<Tags> {
 	public Tags decode(final byte[] bytes) {
 		return Tags.fromBytes(bytes);
 	}
+	
+	@Override
+	public byte[] getEmptyValue() {
+		return new byte[] {};
+	}
 }