001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.quotas;
019
020import java.util.Objects;
021import java.util.concurrent.ConcurrentHashMap;
022import java.util.concurrent.ConcurrentMap;
023import org.apache.commons.lang3.builder.HashCodeBuilder;
024import org.apache.hadoop.conf.Configuration;
025import org.apache.hadoop.fs.FileSystem;
026import org.apache.hadoop.hbase.TableName;
027import org.apache.hadoop.hbase.client.Connection;
028import org.apache.yetus.audience.InterfaceAudience;
029
030/**
031 * A factory for getting instances of {@link FileArchiverNotifier}.
032 */
033@InterfaceAudience.Private
034public final class FileArchiverNotifierFactoryImpl implements FileArchiverNotifierFactory {
035  private static final FileArchiverNotifierFactoryImpl DEFAULT_INSTANCE =
036    new FileArchiverNotifierFactoryImpl();
037  private static volatile FileArchiverNotifierFactory CURRENT_INSTANCE = DEFAULT_INSTANCE;
038  private final ConcurrentMap<TableName, FileArchiverNotifier> CACHE;
039
040  private FileArchiverNotifierFactoryImpl() {
041    CACHE = new ConcurrentHashMap<>();
042  }
043
044  public static FileArchiverNotifierFactory getInstance() {
045    return CURRENT_INSTANCE;
046  }
047
048  static void setInstance(FileArchiverNotifierFactory inst) {
049    CURRENT_INSTANCE = Objects.requireNonNull(inst);
050  }
051
052  static void reset() {
053    CURRENT_INSTANCE = DEFAULT_INSTANCE;
054  }
055
056  /**
057   * Returns the {@link FileArchiverNotifier} instance for the given {@link TableName}.
058   * @param tn The table to obtain a notifier for
059   * @return The notifier for the given {@code tablename}.
060   */
061  public FileArchiverNotifier get(Connection conn, Configuration conf, FileSystem fs,
062    TableName tn) {
063    // Ensure that only one instance is exposed to callers
064    return CACHE.computeIfAbsent(tn, key -> new FileArchiverNotifierImpl(conn, conf, fs, key));
065  }
066
067  public int getCacheSize() {
068    return CACHE.size();
069  }
070
071  static class CacheKey {
072    final Connection conn;
073    final Configuration conf;
074    final FileSystem fs;
075    final TableName tn;
076
077    CacheKey(Connection conn, Configuration conf, FileSystem fs, TableName tn) {
078      this.conn = conn;
079      this.conf = conf;
080      this.fs = fs;
081      this.tn = tn;
082    }
083
084    @Override
085    public boolean equals(Object o) {
086      if (!(o instanceof CacheKey)) {
087        return false;
088      }
089      CacheKey other = (CacheKey) o;
090      // TableName should be the only thing differing..
091      return tn.equals(other.tn) && conn.equals(other.conn) && conf.equals(other.conf)
092        && fs.equals(other.fs);
093    }
094
095    @Override
096    public int hashCode() {
097      return new HashCodeBuilder().append(conn).append(conf).append(fs).append(tn).toHashCode();
098    }
099
100    @Override
101    public String toString() {
102      return "CacheKey[TableName=" + tn + "]";
103    }
104  }
105}