org.apache.hadoop.hbase.io

类 ByteBufferWriterOutputStream

java.lang.Object

java.io.OutputStream

org.apache.hadoop.hbase.io.ByteBufferWriterOutputStream

所有已实现的接口:

Closeable, Flushable, AutoCloseable, ByteBufferWriter

@InterfaceAudience.Private
public class ByteBufferWriterOutputStream
extends OutputStream
implements ByteBufferWriter

When deal with OutputStream which is not ByteBufferWriter type, wrap it with this class. We will have to write offheap ByteBuffer (DBB) data into the OS. This class is having a temp byte array to which we can copy the DBB data for writing to the OS.
This is used while writing Cell data to WAL. In case of AsyncWAL, the OS created there is ByteBufferWriter. But in case of FSHLog, the OS passed by DFS client, is not of type ByteBufferWriter. We will need this temp solution until DFS client supports writing ByteBuffer directly to the OS it creates.
Note: This class is not thread safe.

构造器概要

构造器

构造器和说明
ByteBufferWriterOutputStream(OutputStream os)
ByteBufferWriterOutputStream(OutputStream os, int size)

方法概要

限定符和类型	方法和说明
void	close()
void	flush()
void	write(byte[] b, int off, int len)
void	write(ByteBuffer b, int off, int len) Writes len bytes from the specified ByteBuffer starting at offset off to this OutputStream.
void	write(int b)
void	writeInt(int i) Writes an int to the underlying output stream as four bytes, high byte first.

从类继承的方法 java.io.OutputStream

write

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

ByteBufferWriterOutputStream

public ByteBufferWriterOutputStream(OutputStream os)

ByteBufferWriterOutputStream

public ByteBufferWriterOutputStream(OutputStream os,
                                    int size)

方法详细资料

write

public void write(ByteBuffer b,
                  int off,
                  int len)
           throws IOException

Writes len bytes from the specified ByteBuffer starting at offset off to this OutputStream. If b is null, a NullPointerException is thrown. If off is negative or larger than the ByteBuffer then an ArrayIndexOutOfBoundsException is thrown. If len is greater than the length of the ByteBuffer, then an ArrayIndexOutOfBoundsException is thrown. This method does not change the position of the ByteBuffer.

指定者:

write 在接口中 ByteBufferWriter

参数:

b - the ByteBuffer

off - the start offset in the data

len - the number of bytes to write

抛出:

IOException - if an I/O error occurs. In particular, an IOException is thrown if the output stream is closed.

writeInt

public void writeInt(int i)
              throws IOException

从接口复制的说明: ByteBufferWriter

Writes an int to the underlying output stream as four bytes, high byte first.

指定者:

writeInt 在接口中 ByteBufferWriter

参数:

i - the int to write

抛出:

IOException - if an I/O error occurs.

write

public void write(int b)
           throws IOException

指定者:

write 在类中 OutputStream

抛出:

IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

覆盖:

write 在类中 OutputStream

抛出:

IOException

flush

public void flush()
           throws IOException

指定者:

flush 在接口中 Flushable

覆盖:

flush 在类中 OutputStream

抛出:

IOException

close

public void close()
           throws IOException

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

覆盖:

close 在类中 OutputStream

抛出:

IOException