replace string device id with interface IDeviceID

common/src/main/java/org/apache/tsfile/utils/Accountable.java

@@ -0,0 +1,25 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tsfile.utils;
+
+public interface Accountable {
+  /** Return the memory usage of this object in bytes. Negative values are illegal. */
+  long ramBytesUsed();
+}

common/src/main/java/org/apache/tsfile/utils/RamUsageEstimator.java

@@ -382,7 +382,9 @@ private static long sizeOfObject(Object o, int depth, long defSize) {
       return 0;
     }
     long size;
-    if (o instanceof String) {
+    if (o instanceof Accountable) {
+      size = ((Accountable) o).ramBytesUsed();
+    } else if (o instanceof String) {
       size = sizeOf((String) o);
     } else if (o instanceof boolean[]) {
       size = sizeOf((boolean[]) o);

tsfile/src/main/java/org/apache/tsfile/file/IMetadataIndexEntry.java

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tsfile.file;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public interface IMetadataIndexEntry {
+
+  long getOffset();
+
+  void setOffset(long offset);
+
+  int serializeTo(OutputStream outputStream) throws IOException;
+
+  Comparable getCompareKey();
+
+  boolean isDeviceLevel();
+}

tsfile/src/main/java/org/apache/tsfile/file/header/ChunkGroupHeader.java

@@ -21,6 +21,8 @@
 
 import org.apache.tsfile.common.conf.TSFileConfig;
 import org.apache.tsfile.file.MetaMarker;
+import org.apache.tsfile.file.metadata.IDeviceID;
+import org.apache.tsfile.file.metadata.PlainDeviceID;
 import org.apache.tsfile.read.reader.TsFileInput;
 import org.apache.tsfile.utils.ReadWriteForEncodingUtils;
 import org.apache.tsfile.utils.ReadWriteIOUtils;
@@ -33,7 +35,7 @@ public class ChunkGroupHeader {
 
   private static final byte MARKER = MetaMarker.CHUNK_GROUP_HEADER;
 
-  private final String deviceID;
+  private final IDeviceID deviceID;
 
   // this field does not need to be serialized.
   private final int serializedSize;
@@ -43,7 +45,7 @@ public class ChunkGroupHeader {
    *
    * @param deviceID device ID
    */
-  public ChunkGroupHeader(String deviceID) {
+  public ChunkGroupHeader(IDeviceID deviceID) {
     this.deviceID = deviceID;
     this.serializedSize = getSerializedSize(deviceID);
   }
@@ -52,8 +54,10 @@ public int getSerializedSize() {
     return serializedSize;
   }
 
-  private int getSerializedSize(String deviceID) {
-    int length = deviceID.getBytes(TSFileConfig.STRING_CHARSET).length;
+  private int getSerializedSize(IDeviceID deviceID) {
+    // TODO: add an interface in IDeviceID
+    int length =
+        ((PlainDeviceID) deviceID).toStringID().getBytes(TSFileConfig.STRING_CHARSET).length;
     return Byte.BYTES + ReadWriteForEncodingUtils.varIntSize(length) + length;
   }
 
@@ -72,11 +76,12 @@ public static ChunkGroupHeader deserializeFrom(InputStream inputStream, boolean
       }
     }
 
+    // TODO: add an interface in IDeviceID
     String deviceID = ReadWriteIOUtils.readVarIntString(inputStream);
     if (deviceID == null || deviceID.isEmpty()) {
       throw new IOException("DeviceId is empty");
     }
-    return new ChunkGroupHeader(deviceID);
+    return new ChunkGroupHeader(new PlainDeviceID(deviceID));
   }
 
   /**
@@ -91,11 +96,12 @@ public static ChunkGroupHeader deserializeFrom(TsFileInput input, long offset, b
     if (!markerRead) {
       offsetVar++;
     }
+    // TODO: add an interface in IDeviceID
     String deviceID = input.readVarIntString(offsetVar);
-    return new ChunkGroupHeader(deviceID);
+    return new ChunkGroupHeader(new PlainDeviceID(deviceID));
   }
 
-  public String getDeviceID() {
+  public IDeviceID getDeviceID() {
     return deviceID;
   }
 
@@ -109,15 +115,15 @@ public String getDeviceID() {
   public int serializeTo(OutputStream outputStream) throws IOException {
     int length = 0;
     length += ReadWriteIOUtils.write(MARKER, outputStream);
-    length += ReadWriteIOUtils.writeVar(deviceID, outputStream);
+    length += ReadWriteIOUtils.writeVar(((PlainDeviceID) deviceID).toStringID(), outputStream);
     return length;
   }
 
   @Override
   public String toString() {
     return "ChunkGroupHeader{"
         + "deviceID='"
-        + deviceID
+        + ((PlainDeviceID) deviceID).toStringID()
         + '\''
         + ", serializedSize="
         + serializedSize

tsfile/src/main/java/org/apache/tsfile/file/metadata/ChunkGroupMetadata.java

@@ -24,16 +24,16 @@
 /** Only maintained when writing, not serialized to TsFile. */
 public class ChunkGroupMetadata {
 
-  private String device;
+  private IDeviceID device;
 
   private List<ChunkMetadata> chunkMetadataList;
 
-  public ChunkGroupMetadata(String device, List<ChunkMetadata> chunkMetadataList) {
+  public ChunkGroupMetadata(IDeviceID device, List<ChunkMetadata> chunkMetadataList) {
     this.device = device;
     this.chunkMetadataList = chunkMetadataList;
   }
 
-  public String getDevice() {
+  public IDeviceID getDevice() {
     return device;
   }
 

tsfile/src/main/java/org/apache/tsfile/file/metadata/DeviceMetadataIndexEntry.java

@@ -0,0 +1,92 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tsfile.file.metadata;
+
+import org.apache.tsfile.file.IMetadataIndexEntry;
+import org.apache.tsfile.utils.ReadWriteIOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+public class DeviceMetadataIndexEntry implements IMetadataIndexEntry {
+  private IDeviceID deviceID;
+  private long offset;
+
+  public DeviceMetadataIndexEntry(IDeviceID deviceID, long offset) {
+    this.deviceID = deviceID;
+    this.offset = offset;
+  }
+
+  public IDeviceID getDeviceID() {
+    return deviceID;
+  }
+
+  @Override
+  public long getOffset() {
+    return offset;
+  }
+
+  public void setDeviceID(IDeviceID deviceID) {
+    this.deviceID = deviceID;
+  }
+
+  @Override
+  public void setOffset(long offset) {
+    this.offset = offset;
+  }
+
+  @Override
+  public int serializeTo(OutputStream outputStream) throws IOException {
+    int byteLen = 0;
+    byteLen += deviceID.serialize(outputStream);
+    byteLen += ReadWriteIOUtils.write(offset, outputStream);
+    return byteLen;
+  }
+
+  @Override
+  public Comparable getCompareKey() {
+    return deviceID;
+  }
+
+  @Override
+  public boolean isDeviceLevel() {
+    return true;
+  }
+
+  public static DeviceMetadataIndexEntry deserializeFrom(ByteBuffer buffer) {
+    IDeviceID device = IDeviceID.deserializeFrom(buffer);
+    long offset = ReadWriteIOUtils.readLong(buffer);
+    return new DeviceMetadataIndexEntry(device, offset);
+  }
+
+  public static DeviceMetadataIndexEntry deserializeFrom(InputStream inputStream)
+      throws IOException {
+    IDeviceID device = IDeviceID.deserializeFrom(inputStream);
+    long offset = ReadWriteIOUtils.readLong(inputStream);
+    return new DeviceMetadataIndexEntry(device, offset);
+  }
+
+  @Override
+  public String toString() {
+    return "<" + deviceID + "," + offset + ">";
+  }
+}

tsfile/src/main/java/org/apache/tsfile/file/metadata/IDeviceID.java

@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tsfile.file.metadata;
+
+import org.apache.tsfile.utils.Accountable;
+import org.apache.tsfile.utils.ReadWriteIOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+/** Device id interface. */
+public interface IDeviceID extends Comparable<IDeviceID>, Accountable {
+
+  int serialize(ByteBuffer byteBuffer);
+
+  int serialize(OutputStream outputStream) throws IOException;
+
+  byte[] getBytes();
+
+  boolean isEmpty();
+
+  static IDeviceID deserializeFrom(ByteBuffer byteBuffer) {
+    return new PlainDeviceID(ReadWriteIOUtils.readVarIntString(byteBuffer));
+  }
+
+  static IDeviceID deserializeFrom(InputStream inputStream) throws IOException {
+    return new PlainDeviceID(ReadWriteIOUtils.readVarIntString(inputStream));
+  }
+}