001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to you under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.hadoop.hbase.quotas;
018
019import java.util.concurrent.atomic.AtomicLong;
020
021import org.apache.hadoop.hbase.util.ClassSize;
022import org.apache.yetus.audience.InterfaceAudience;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025
026/**
027 * An object encapsulating a Region's size and whether it's been reported to the master since
028 * the value last changed.
029 */
030@InterfaceAudience.Private
031public class RegionSizeImpl implements RegionSize {
032  private static final Logger LOG = LoggerFactory.getLogger(RegionSizeImpl.class);
033  private static final long HEAP_SIZE = ClassSize.OBJECT + ClassSize.ATOMIC_LONG +
034    ClassSize.REFERENCE;
035  private final AtomicLong size;
036
037  public RegionSizeImpl(long initialSize) {
038    // A region can never be negative in size. We can prevent this from being a larger problem, but
039    // we will need to leave ourselves a note to figure out how we got here.
040    if (initialSize < 0L && LOG.isTraceEnabled()) {
041      LOG.trace("Nonsensical negative Region size being constructed, this is likely an error",
042          new Exception());
043    }
044    this.size = new AtomicLong(initialSize < 0L ? 0L : initialSize);
045  }
046
047  @Override
048  public long heapSize() {
049    return HEAP_SIZE;
050  }
051
052  @Override
053  public RegionSizeImpl setSize(long newSize) {
054    // Set the new size before advertising that we need to tell the master about it. Worst case
055    // we have to wait for the next period to report it.
056    size.set(newSize);
057    return this;
058  }
059
060  @Override
061  public RegionSizeImpl incrementSize(long delta) {
062    size.addAndGet(delta);
063    return this;
064  }
065
066  @Override
067  public long getSize() {
068    return size.get();
069  }
070}