org.rocksdb

类 ComparatorOptions

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksObject

org.rocksdb.ComparatorOptions

所有已实现的接口:

java.lang.AutoCloseable

public class ComparatorOptions
extends RocksObject

This class controls the behaviour of Java implementations of AbstractComparator

Note that dispose() must be called before a ComparatorOptions instance becomes out-of-scope to release the allocated memory in C++.

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
ComparatorOptions()

方法概要

限定符和类型	方法和说明
protected void	disposeInternal(long handle)
int	maxReusedBufferSize() Maximum size of a buffer (in bytes) that will be reused.
ReusedSynchronisationType	reusedSynchronisationType() Get the synchronisation type used to guard the reused buffers.
ComparatorOptions	setMaxReusedBufferSize(int maxReusedBufferSize) Sets the maximum size of a buffer (in bytes) that will be reused.
ComparatorOptions	setReusedSynchronisationType(ReusedSynchronisationType reusedSynchronisationType) Set the synchronisation type used to guard the reused buffers.
ComparatorOptions	setUseDirectBuffer(boolean useDirectBuffer) Controls whether a direct byte buffer (i.e. outside the normal garbage-collected heap) is used, as opposed to a non-direct byte buffer which is a wrapper around an on-heap byte[].
boolean	useDirectBuffer() Indicates if a direct byte buffer (i.e. outside the normal garbage-collected heap) is used, as opposed to a non-direct byte buffer which is a wrapper around an on-heap byte[].

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

ComparatorOptions

public ComparatorOptions()

方法详细资料

reusedSynchronisationType

public ReusedSynchronisationType reusedSynchronisationType()

Get the synchronisation type used to guard the reused buffers. Only used if maxReusedBufferSize() > 0 Default: ReusedSynchronisationType.ADAPTIVE_MUTEX

返回:

the synchronisation type

setReusedSynchronisationType

public ComparatorOptions setReusedSynchronisationType(ReusedSynchronisationType reusedSynchronisationType)

Set the synchronisation type used to guard the reused buffers. Only used if maxReusedBufferSize() > 0 Default: ReusedSynchronisationType.ADAPTIVE_MUTEX

参数:

reusedSynchronisationType - the synchronisation type

返回:

the reference to the current comparator options.

useDirectBuffer

public boolean useDirectBuffer()

Indicates if a direct byte buffer (i.e. outside the normal garbage-collected heap) is used, as opposed to a non-direct byte buffer which is a wrapper around an on-heap byte[].

Default: true

返回:

true if a direct byte buffer will be used, false otherwise

setUseDirectBuffer

public ComparatorOptions setUseDirectBuffer(boolean useDirectBuffer)

Controls whether a direct byte buffer (i.e. outside the normal garbage-collected heap) is used, as opposed to a non-direct byte buffer which is a wrapper around an on-heap byte[].

Default: true

参数:

useDirectBuffer - true if a direct byte buffer should be used, false otherwise

返回:

the reference to the current comparator options.

maxReusedBufferSize

public int maxReusedBufferSize()

Maximum size of a buffer (in bytes) that will be reused. Comparators will use 5 of these buffers, so the retained memory size will be 5 * max_reused_buffer_size. When a buffer is needed for transferring data to a callback, if it requires less than maxReuseBufferSize, then an existing buffer will be reused, else a new buffer will be allocated just for that callback.

Default: 64 bytes

返回:

the maximum size of a buffer which is reused, or 0 if reuse is disabled

setMaxReusedBufferSize

public ComparatorOptions setMaxReusedBufferSize(int maxReusedBufferSize)

Sets the maximum size of a buffer (in bytes) that will be reused. Comparators will use 5 of these buffers, so the retained memory size will be 5 * max_reused_buffer_size. When a buffer is needed for transferring data to a callback, if it requires less than maxReuseBufferSize, then an existing buffer will be reused, else a new buffer will be allocated just for that callback.

Default: 64 bytes

参数:

maxReusedBufferSize - the maximum size for a buffer to reuse, or 0 to disable reuse

返回:

the maximum size of a buffer which is reused

disposeInternal

protected final void disposeInternal(long handle)

指定者:

disposeInternal 在类中 RocksObject