001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase;
020
021import java.util.Collections;
022import java.util.Map;
023import java.util.stream.Collectors;
024
025import org.apache.hadoop.hbase.client.RegionInfo;
026import org.apache.yetus.audience.InterfaceAudience;
027
028@InterfaceAudience.Public
029public final class CacheEvictionStats {
030
031  private final long evictedBlocks;
032  private final long maxCacheSize;
033  private final Map<byte[], Throwable> exceptions;
034
035  CacheEvictionStats(CacheEvictionStatsBuilder builder) {
036    this.evictedBlocks = builder.evictedBlocks;
037    this.maxCacheSize = builder.maxCacheSize;
038    this.exceptions = builder.exceptions;
039  }
040
041  public long getEvictedBlocks() {
042    return evictedBlocks;
043  }
044
045  public long getMaxCacheSize() {
046    return maxCacheSize;
047  }
048
049  public Map<byte[], Throwable> getExceptions() {
050    return Collections.unmodifiableMap(exceptions);
051  }
052
053  public int getExceptionCount() {
054    return exceptions.size();
055  }
056
057  private String getFailedRegions() {
058    return exceptions.keySet().stream()
059        .map(regionName -> RegionInfo.prettyPrint(RegionInfo.encodeRegionName(regionName)))
060        .collect(Collectors.toList())
061        .toString();
062  }
063
064  @InterfaceAudience.Private
065  public static CacheEvictionStatsBuilder builder() {
066    return new CacheEvictionStatsBuilder();
067  }
068
069  @Override
070  public String toString() {
071    return "CacheEvictionStats{" +
072        "evictedBlocks=" + evictedBlocks +
073        ", maxCacheSize=" + maxCacheSize +
074        ", failedRegionsSize=" + getExceptionCount() +
075        ", failedRegions=" + getFailedRegions() +
076        '}';
077  }
078}