org.rocksdb.CompactionOptionsFIFO Maven / Gradle / Ivy

Go to download

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

RocksDB fat jar that contains .so files for linux32 and linux64 (glibc and musl-libc), jnilib files for Mac OSX, and a .dll for Windows x64.

There is a newer version: 0.1.0-RC.5

Show newest version

// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

package org.rocksdb;

/**
 * Options for FIFO Compaction
 */
public class CompactionOptionsFIFO extends RocksObject {

  public CompactionOptionsFIFO() {
    super(newCompactionOptionsFIFO());
  }

  /**
   * Once the total sum of table files reaches this, we will delete the oldest
   * table file
   *
   * Default: 1GB
   *
   * @param maxTableFilesSize The maximum size of the table files
   *
   * @return the reference to the current options.
   */
  public CompactionOptionsFIFO setMaxTableFilesSize(
      final long maxTableFilesSize) {
    setMaxTableFilesSize(nativeHandle_, maxTableFilesSize);
    return this;
  }

  /**
   * Once the total sum of table files reaches this, we will delete the oldest
   * table file
   *
   * Default: 1GB
   *
   * @return max table file size in bytes
   */
  public long maxTableFilesSize() {
    return maxTableFilesSize(nativeHandle_);
  }

  /**
   * If true, try to do compaction to compact smaller files into larger ones.
   * Minimum files to compact follows options.level0_file_num_compaction_trigger
   * and compaction won't trigger if average compact bytes per del file is
   * larger than options.write_buffer_size. This is to protect large files
   * from being compacted again.
   *
   * Default: false
   *
   * @param allowCompaction true to allow intra-L0 compaction
   *
   * @return the reference to the current options.
   */
  public CompactionOptionsFIFO setAllowCompaction(
      final boolean allowCompaction) {
    setAllowCompaction(nativeHandle_, allowCompaction);
    return this;
  }


  /**
   * Check if intra-L0 compaction is enabled.
   * When enabled, we try to compact smaller files into larger ones.
   *
   * See {@link #setAllowCompaction(boolean)}.
   *
   * Default: false
   *
   * @return true if intra-L0 compaction is enabled, false otherwise.
   */
  public boolean allowCompaction() {
    return allowCompaction(nativeHandle_);
  }


  private native static long newCompactionOptionsFIFO();
  @Override protected final native void disposeInternal(final long handle);

  private native void setMaxTableFilesSize(final long handle,
      final long maxTableFilesSize);
  private native long maxTableFilesSize(final long handle);
  private native void setAllowCompaction(final long handle,
      final boolean allowCompaction);
  private native boolean allowCompaction(final long handle);
}