org.rocksdb.CompressionOptions Maven / Gradle / Ivy
// 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 Compression
*/
public class CompressionOptions extends RocksObject {
public CompressionOptions() {
super(newCompressionOptions());
}
public CompressionOptions setWindowBits(final int windowBits) {
setWindowBits(nativeHandle_, windowBits);
return this;
}
public int windowBits() {
return windowBits(nativeHandle_);
}
public CompressionOptions setLevel(final int level) {
setLevel(nativeHandle_, level);
return this;
}
public int level() {
return level(nativeHandle_);
}
public CompressionOptions setStrategy(final int strategy) {
setStrategy(nativeHandle_, strategy);
return this;
}
public int strategy() {
return strategy(nativeHandle_);
}
/**
* Maximum size of dictionary used to prime the compression library. Currently
* this dictionary will be constructed by sampling the first output file in a
* subcompaction when the target level is bottommost. This dictionary will be
* loaded into the compression library before compressing/uncompressing each
* data block of subsequent files in the subcompaction. Effectively, this
* improves compression ratios when there are repetitions across data blocks.
*
* A value of 0 indicates the feature is disabled.
*
* Default: 0.
*
* @param maxDictBytes Maximum bytes to use for the dictionary
*
* @return the reference to the current options
*/
public CompressionOptions setMaxDictBytes(final int maxDictBytes) {
setMaxDictBytes(nativeHandle_, maxDictBytes);
return this;
}
/**
* Maximum size of dictionary used to prime the compression library.
*
* @return The maximum bytes to use for the dictionary
*/
public int maxDictBytes() {
return maxDictBytes(nativeHandle_);
}
private native static long newCompressionOptions();
@Override protected final native void disposeInternal(final long handle);
private native void setWindowBits(final long handle, final int windowBits);
private native int windowBits(final long handle);
private native void setLevel(final long handle, final int level);
private native int level(final long handle);
private native void setStrategy(final long handle, final int strategy);
private native int strategy(final long handle);
private native void setMaxDictBytes(final long handle, final int maxDictBytes);
private native int maxDictBytes(final long handle);
}