/**
    * 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.hadoop.hbase.regionserver;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.HColumnDescriptor;
  import org.apache.hadoop.hbase.KeepDeletedCells;
  import org.apache.hadoop.hbase.KeyValue.KVComparator;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.util.ClassSize;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.HConstants;
  import com.google.common.annotations.VisibleForTesting;
  
  /**
   * Immutable information for scans over a store.
   */
  // Has to be public for PartitionedMobCompactor to access; ditto on tests making use of a few of
  // the accessors below. Shutdown access. TODO
  @VisibleForTesting
  @InterfaceAudience.Private
  public class ScanInfo {
    private byte[] family;
    private int minVersions;
    private int maxVersions;
    private long ttl;
    private KeepDeletedCells keepDeletedCells;
    private long timeToPurgeDeletes;
    private KVComparator comparator;
    private long tableMaxRowSize;
    private boolean usePread;
    private long cellsPerTimeoutCheck;
    private boolean parallelSeekEnabled;
    private final Configuration conf;
  
    public static final long FIXED_OVERHEAD = ClassSize.align(ClassSize.OBJECT
        + (2 * ClassSize.REFERENCE) + (2 * Bytes.SIZEOF_INT)
        + (4 * Bytes.SIZEOF_LONG) + (3 * Bytes.SIZEOF_BOOLEAN));
  
    /**
     * @param conf
     * @param family {@link HColumnDescriptor} describing the column family
     * @param ttl Store's TTL (in ms)
     * @param timeToPurgeDeletes duration in ms after which a delete marker can
     *        be purged during a major compaction.
     * @param comparator The store's comparator
     */
    public ScanInfo(final Configuration conf, final HColumnDescriptor family, final long ttl,
        final long timeToPurgeDeletes, final KVComparator comparator) {
      this(conf, family.getName(), family.getMinVersions(), family.getMaxVersions(), ttl, family
          .getKeepDeletedCells(), timeToPurgeDeletes, comparator);
    }
  
    /**
     * @param conf
     * @param family Name of this store's column family
     * @param minVersions Store's MIN_VERSIONS setting
     * @param maxVersions Store's VERSIONS setting
     * @param ttl Store's TTL (in ms)
     * @param timeToPurgeDeletes duration in ms after which a delete marker can
     *        be purged during a major compaction.
     * @param keepDeletedCells Store's keepDeletedCells setting
     * @param comparator The store's comparator
     */
    public ScanInfo(final Configuration conf, final byte[] family, final int minVersions,
        final int maxVersions, final long ttl, final KeepDeletedCells keepDeletedCells,
        final long timeToPurgeDeletes, final KVComparator comparator) {
      this.family = family;
      this.minVersions = minVersions;
      this.maxVersions = maxVersions;
      this.ttl = ttl;
      this.keepDeletedCells = keepDeletedCells;
      this.timeToPurgeDeletes = timeToPurgeDeletes;
      this.comparator = comparator;
      this.tableMaxRowSize =
        conf.getLong(HConstants.TABLE_MAX_ROWSIZE_KEY, HConstants.TABLE_MAX_ROWSIZE_DEFAULT);
      this.usePread = conf.getBoolean("hbase.storescanner.use.pread", false);
      long perHeartbeat =
        conf.getLong(StoreScanner.HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK,
          StoreScanner.DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK);
      this.cellsPerTimeoutCheck = perHeartbeat > 0?
          perHeartbeat: StoreScanner.DEFAULT_HBASE_CELLS_SCANNED_PER_HEARTBEAT_CHECK;
      this.parallelSeekEnabled =
       conf.getBoolean(StoreScanner.STORESCANNER_PARALLEL_SEEK_ENABLE, false);
     this.conf = conf;
   }
 
   public Configuration getConfiguration() {
     return this.conf;
   }
 
   long getTableMaxRowSize() {
     return this.tableMaxRowSize;
   }
 
   boolean isUsePread() {
     return this.usePread;
   }
 
   long getCellsPerTimeoutCheck() {
     return this.cellsPerTimeoutCheck;
   }
 
   boolean isParallelSeekEnabled() {
     return this.parallelSeekEnabled;
   }
 
   byte[] getFamily() {
     return family;
   }
 
   int getMinVersions() {
     return minVersions;
   }
 
   public int getMaxVersions() {
     return maxVersions;
   }
 
   public long getTtl() {
     return ttl;
   }
 
   KeepDeletedCells getKeepDeletedCells() {
     return keepDeletedCells;
   }
 
   public long getTimeToPurgeDeletes() {
     return timeToPurgeDeletes;
   }
 
   public KVComparator getComparator() {
     return comparator;
   }
 }