org.rocksdb

类 Env

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksObject

org.rocksdb.Env

所有已实现的接口:

java.lang.AutoCloseable

直接已知子类:

RocksEnv, RocksMemEnv, TimedEnv

public abstract class Env
extends RocksObject

Base class for all Env implementations in RocksDB.

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_

方法概要

限定符和类型	方法和说明
int	getBackgroundThreads(Priority priority) Gets the number of background worker threads of the pool for this environment.
static Env	getDefault() Returns the default environment suitable for the current operating system.
java.util.List<ThreadStatus>	getThreadList() Returns the status of all threads that belong to the current Env.
int	getThreadPoolQueueLen(Priority priority) Returns the length of the queue associated with the specified thread pool.
Env	incBackgroundThreadsIfNeeded(int number, Priority priority) Enlarge number of background worker threads of a specific thread pool for this environment if it is smaller than specified.
Env	lowerThreadPoolCPUPriority(Priority priority) Lower CPU priority for threads from the specified pool.
Env	lowerThreadPoolIOPriority(Priority priority) Lower IO priority for threads from the specified pool.
Env	setBackgroundThreads(int number) Sets the number of background worker threads of the low priority pool for this environment.
Env	setBackgroundThreads(int number, Priority priority) Sets the number of background worker threads of the specified thread pool for this environment.

从类继承的方法 org.rocksdb.RocksObject

disposeInternal, 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

方法详细资料

getDefault

public static Env getDefault()

Returns the default environment suitable for the current operating system.

The result of getDefault() is a singleton whose ownership belongs to rocksdb c++. As a result, the returned RocksEnv will not have the ownership of its c++ resource, and calling its dispose()/close() will be no-op.

返回:

the default RocksEnv instance.

setBackgroundThreads

public Env setBackgroundThreads(int number)

Sets the number of background worker threads of the low priority pool for this environment.

Default number: 1

参数:

number - the number of threads

返回:

current RocksEnv instance.

getBackgroundThreads

public int getBackgroundThreads(Priority priority)

Gets the number of background worker threads of the pool for this environment.

参数:

priority - the priority id of a specified thread pool.

返回:

the number of threads.

setBackgroundThreads

public Env setBackgroundThreads(int number,
                                Priority priority)

Sets the number of background worker threads of the specified thread pool for this environment.

参数:

number - the number of threads

priority - the priority id of a specified thread pool.

Default number: 1

返回:

current RocksEnv instance.

getThreadPoolQueueLen

public int getThreadPoolQueueLen(Priority priority)

Returns the length of the queue associated with the specified thread pool.

参数:

priority - the priority id of a specified thread pool.

返回:

the thread pool queue length.

incBackgroundThreadsIfNeeded

public Env incBackgroundThreadsIfNeeded(int number,
                                        Priority priority)

Enlarge number of background worker threads of a specific thread pool for this environment if it is smaller than specified. 'LOW' is the default pool.

参数:

number - the number of threads.

priority - the priority id of a specified thread pool.

返回:

current RocksEnv instance.

lowerThreadPoolIOPriority

public Env lowerThreadPoolIOPriority(Priority priority)

Lower IO priority for threads from the specified pool.

参数:

priority - the priority id of a specified thread pool.

返回:

current RocksEnv instance.

lowerThreadPoolCPUPriority

public Env lowerThreadPoolCPUPriority(Priority priority)

Lower CPU priority for threads from the specified pool.

参数:

priority - the priority id of a specified thread pool.

返回:

current RocksEnv instance.

getThreadList

public java.util.List<ThreadStatus> getThreadList()
                                           throws RocksDBException

Returns the status of all threads that belong to the current Env.

返回:

the status of all threads belong to this env.

抛出:

RocksDBException - if the thread list cannot be acquired.