org.apache.hadoop.hbase.io.hfile.bucket

类 ByteBufferIOEngine

java.lang.Object

org.apache.hadoop.hbase.io.hfile.bucket.ByteBufferIOEngine

所有已实现的接口:

IOEngine

@InterfaceAudience.Private
public class ByteBufferIOEngine
extends Object
implements IOEngine

IO engine that stores data in memory using an array of ByteBuffers ByteBufferArray

构造器概要

构造器

构造器和说明
ByteBufferIOEngine(long capacity, boolean direct) Construct the ByteBufferIOEngine with the given capacity

方法概要

方法

限定符和类型	方法和说明
boolean	isPersistent() Memory IO engine is always unable to support persistent storage for the cache
int	read(ByteBuffer dstBuffer, long offset) Transfers data from the buffer array to the given byte buffer
void	shutdown() No operation for the shutdown in the memory IO engine
void	sync() No operation for the sync in the memory IO engine
String	toString()
void	write(ByteBuffer srcBuffer, long offset) Transfers data from the given byte buffer to the buffer array

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

ByteBufferIOEngine

public ByteBufferIOEngine(long capacity,
                  boolean direct)
                   throws IOException

Construct the ByteBufferIOEngine with the given capacity

参数:

capacity -

direct - true if allocate direct buffer

抛出:

IOException

方法详细资料

toString

public String toString()

覆盖:

toString 在类中 Object

isPersistent

public boolean isPersistent()

Memory IO engine is always unable to support persistent storage for the cache

指定者:

isPersistent 在接口中 IOEngine

返回:

false

read

public int read(ByteBuffer dstBuffer,
       long offset)
         throws IOException

Transfers data from the buffer array to the given byte buffer

指定者:

read 在接口中 IOEngine

参数:

dstBuffer - the given byte buffer into which bytes are to be written

offset - The offset in the ByteBufferArray of the first byte to be read

返回:

number of bytes read

抛出:

IOException

write

public void write(ByteBuffer srcBuffer,
         long offset)
           throws IOException

Transfers data from the given byte buffer to the buffer array

指定者:

write 在接口中 IOEngine

参数:

srcBuffer - the given byte buffer from which bytes are to be read

offset - The offset in the ByteBufferArray of the first byte to be written

抛出:

IOException

sync

public void sync()

No operation for the sync in the memory IO engine

指定者:

sync 在接口中 IOEngine

shutdown

public void shutdown()

No operation for the shutdown in the memory IO engine

指定者:

shutdown 在接口中 IOEngine