iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/resource/memory/PipeMemoryWeighUtil.java

/*
 * 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.iotdb.db.pipe.resource.memory;

import org.apache.iotdb.db.utils.MemUtils;
import org.apache.iotdb.tsfile.file.metadata.IDeviceID;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;

import java.util.List;
import java.util.Map;

public class PipeMemoryWeighUtil {
  /** Estimates memory usage of a {@link Map}<{@link IDeviceID}, {@link Boolean}>. */
  public static long memoryOfIDeviceId2Bool(Map<IDeviceID, Boolean> map) {
    long usageInBytes = 0L;
    for (Map.Entry<IDeviceID, Boolean> entry : map.entrySet()) {
      usageInBytes = usageInBytes + entry.getKey().ramBytesUsed() + 1L;
    }
    return usageInBytes + 16L; // add the overhead of map
  }

  /** Estimates memory usage of a {@link Map}<{@link String}, {@link TSDataType}>. */
  public static long memoryOfStr2TSDataType(Map<String, TSDataType> map) {
    long usageInBytes = 0L;
    for (Map.Entry<String, TSDataType> entry : map.entrySet()) {
      usageInBytes = usageInBytes + MemUtils.getStringMem(entry.getKey()) + 4L;
    }
    return usageInBytes + 16L; // add the overhead of map
  }

  /** Estimates memory usage of a {@link Map}<{@link IDeviceID}, {@link List}<{@link String}>>. */
  public static long memoryOfIDeviceID2StrList(Map<IDeviceID, List<String>> map) {
    long usageInBytes = 0L;
    for (Map.Entry<IDeviceID, List<String>> entry : map.entrySet()) {
      usageInBytes += entry.getKey().ramBytesUsed();
      for (String str : entry.getValue()) {
        usageInBytes += MemUtils.getStringMem(str);
      }
    }
    return usageInBytes + 16L; // add the overhead of map
  }
}