org.rocksdb.SkipListMemTableConfig Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of frocksdbjni Show documentation

RocksDB fat jar to use with Apache Flink that contains .so files for linux32 and linux64, jnilib files for Mac OSX, and a .dll for Windows x64.

There is a newer version: 5.17.2-artisans-2.0

Show newest version

package org.rocksdb;

/**
 * The config for skip-list memtable representation.
 */
public class SkipListMemTableConfig extends MemTableConfig {

  public static final long DEFAULT_LOOKAHEAD = 0;

  /**
   * SkipListMemTableConfig constructor
   */
  public SkipListMemTableConfig() {
    lookahead_ = DEFAULT_LOOKAHEAD;
  }

  /**
   * Sets lookahead for SkipList
   *
   * @param lookahead If non-zero, each iterator's seek operation
   *     will start the search from the previously visited record
   *     (doing at most 'lookahead' steps). This is an
   *     optimization for the access pattern including many
   *     seeks with consecutive keys.
   * @return the current instance of SkipListMemTableConfig
   */
  public SkipListMemTableConfig setLookahead(final long lookahead) {
    lookahead_ = lookahead;
    return this;
  }

  /**
   * Returns the currently set lookahead value.
   *
   * @return lookahead value
   */
  public long lookahead() {
    return lookahead_;
  }


  @Override protected long newMemTableFactoryHandle() {
    return newMemTableFactoryHandle0(lookahead_);
  }

  private native long newMemTableFactoryHandle0(long lookahead)
      throws IllegalArgumentException;

  private long lookahead_;
}