CompressionOptions

java.lang.Object
- org.rocksdb.AbstractNativeReference
- - org.rocksdb.AbstractImmutableNativeReference
  - - org.rocksdb.RocksObject
    - - org.rocksdb.CompressionOptions

所有已实现的接口:

java.lang.AutoCloseable
```
public class CompressionOptions
extends RocksObject
```
Options for Compression

字段概要
- 从类继承的字段 org.rocksdb.RocksObject
  nativeHandle_
- 从类继承的字段 org.rocksdb.AbstractImmutableNativeReference
  owningHandle_

构造器概要

构造器
构造器和说明

CompressionOptions()

构造器
构造器和说明
`CompressionOptions()`

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`protected void`	`disposeInternal(long handle)`
`boolean`	`enabled()` Determine whether these compression options are used for the bottommost_compression_opts.
`int`	`level()`
`int`	`maxDictBytes()` Maximum size of dictionary used to prime the compression library.
`CompressionOptions`	`setEnabled(boolean enabled)` When the compression options are set by the user, it will be set to "true".
`CompressionOptions`	`setLevel(int level)`
`CompressionOptions`	`setMaxDictBytes(int maxDictBytes)` Maximum size of dictionary used to prime the compression library.
`CompressionOptions`	`setStrategy(int strategy)`
`CompressionOptions`	`setWindowBits(int windowBits)`
`CompressionOptions`	`setZStdMaxTrainBytes(int zstdMaxTrainBytes)` Maximum size of training data passed to zstd's dictionary trainer.
`int`	`strategy()`
`int`	`windowBits()`
`int`	`zstdMaxTrainBytes()` Maximum size of training data passed to zstd's dictionary trainer.

从类继承的方法 org.rocksdb.RocksObject
disposeInternal, getNativeHandle

从类继承的方法 org.rocksdb.AbstractImmutableNativeReference
close, disOwnNativeHandle, isOwningHandle

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - CompressionOptions
```
public CompressionOptions()
```
- 方法详细资料
  - setWindowBits
```
public CompressionOptions setWindowBits(int windowBits)
```
  - windowBits
```
public int windowBits()
```
  - setLevel
```
public CompressionOptions setLevel(int level)
```
  - level
```
public int level()
```
  - setStrategy
```
public CompressionOptions setStrategy(int strategy)
```
  - strategy
```
public int strategy()
```
  - setMaxDictBytes
```
public CompressionOptions setMaxDictBytes(int maxDictBytes)
```
    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.
    
    参数:
    
    maxDictBytes - Maximum bytes to use for the dictionary
    
    返回:
    
    the reference to the current options
  - maxDictBytes
```
public int maxDictBytes()
```
    Maximum size of dictionary used to prime the compression library.
    
    返回:
    
    The maximum bytes to use for the dictionary
  - setZStdMaxTrainBytes
```
public CompressionOptions setZStdMaxTrainBytes(int zstdMaxTrainBytes)
```
    Maximum size of training data passed to zstd's dictionary trainer. Using zstd's dictionary trainer can achieve even better compression ratio improvements than using setMaxDictBytes(int) alone.
    The training data will be used to generate a dictionary of maxDictBytes().
    Default: 0.
    
    参数:
    
    zstdMaxTrainBytes - Maximum bytes to use for training ZStd.
    
    返回:
    
    the reference to the current options
  - zstdMaxTrainBytes
```
public int zstdMaxTrainBytes()
```
    Maximum size of training data passed to zstd's dictionary trainer.
    
    返回:
    
    Maximum bytes to use for training ZStd
  - setEnabled
```
public CompressionOptions setEnabled(boolean enabled)
```
    When the compression options are set by the user, it will be set to "true". For bottommost_compression_opts, to enable it, user must set enabled=true. Otherwise, bottommost compression will use compression_opts as default compression options.
    For compression_opts, if compression_opts.enabled=false, it is still used as compression options for compression process.
    Default: false.
    
    参数:
    
    enabled - true to use these compression options for the bottommost_compression_opts, false otherwise
    
    返回:
    
    the reference to the current options
  - enabled
```
public boolean enabled()
```
    Determine whether these compression options are used for the bottommost_compression_opts.
    
    返回:
    
    true if these compression options are used for the bottommost_compression_opts, false otherwise
  - disposeInternal
```
protected final void disposeInternal(long handle)
```
    指定者:
    
    disposeInternal 在类中 RocksObject

类 CompressionOptions

字段概要

从类继承的字段 org.rocksdb.RocksObject

从类继承的字段 org.rocksdb.AbstractImmutableNativeReference

构造器概要

方法概要

从类继承的方法 org.rocksdb.RocksObject

从类继承的方法 org.rocksdb.AbstractImmutableNativeReference

从类继承的方法 java.lang.Object

构造器详细资料

CompressionOptions

方法详细资料

setWindowBits

windowBits

setLevel

level

setStrategy

strategy

setMaxDictBytes

maxDictBytes

setZStdMaxTrainBytes

zstdMaxTrainBytes

setEnabled

enabled

disposeInternal