Package org.glassfish.grizzly.utils

Class BufferOutputStream

java.lang.Object

java.io.OutputStream

org.glassfish.grizzly.utils.BufferOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class BufferOutputStream
extends OutputStream

OutputStream implementation to write to a Buffer.

Constructor Summary

Constructors

Constructor	Description
BufferOutputStream(MemoryManager mm)	Creates the BufferOutputStream without initial Buffer.
BufferOutputStream(MemoryManager mm, Buffer buffer)	Creates the BufferOutputStream using passed Buffer as initial.
BufferOutputStream(MemoryManager mm, Buffer buffer, boolean reallocate)	Creates the BufferOutputStream using passed Buffer as initial.

Method Summary

Modifier and Type	Method	Description
protected Buffer	allocateNewBuffer(MemoryManager memoryManager, int size)
void	close()
void	flush()
Buffer	getBuffer()	Get the result Buffer (not flipped).
boolean	isReallocate()	Returns true if "reallocate" strategy is used or false otherwise.
void	reset()
void	setInitialOutputBuffer(Buffer initialBuffer)
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Constructor Detail

BufferOutputStream

public BufferOutputStream(MemoryManager mm)

Creates the BufferOutputStream without initial Buffer. Created BufferOutputStream won't use "reallocate" strategy, which means if internal Buffer window gets overloaded - it will be appended to the CompositeBuffer and new window will be allocated.

Parameters:

mm - MemoryManager

BufferOutputStream

public BufferOutputStream(MemoryManager mm,
                          Buffer buffer)

Creates the BufferOutputStream using passed Buffer as initial. Created BufferOutputStream won't use "reallocate" strategy, which means if internal Buffer window gets overloaded - it will be appended to the CompositeBuffer and new window will be allocated.

Parameters:

mm - MemoryManager

buffer - initial Buffer

BufferOutputStream

public BufferOutputStream(MemoryManager mm,
                          Buffer buffer,
                          boolean reallocate)

Creates the BufferOutputStream using passed Buffer as initial. Created BufferOutputStream can choose whether use or not "reallocate" strategy. Using "reallocate" strategy means following: if internal Buffer window gets overloaded - it will be reallocated using MemoryManager.reallocate(org.glassfish.grizzly.Buffer, int), which may lead to extra memory allocation and bytes copying (bigger memory chunk might be allocated to keep original stream data plus extra data been written to stream), the benefit of this is that stream data will be located in the single memory chunk. If we don't use "reallocate" strategy - when internal Buffer gets overloaded it will be appended to the CompositeBuffer and new window Buffer will be allocated then.

Parameters:

mm - MemoryManager

buffer - initial Buffer

Method Detail

setInitialOutputBuffer

public void setInitialOutputBuffer(Buffer initialBuffer)

getBuffer

public Buffer getBuffer()

Get the result Buffer (not flipped).

Returns:

the result Buffer (not flipped).

isReallocate

public boolean isReallocate()

Returns true if "reallocate" strategy is used or false otherwise. Using "reallocate" strategy means following: if internal Buffer window gets overloaded - it will be reallocated using MemoryManager.reallocate(org.glassfish.grizzly.Buffer, int), which may lead to extra memory allocation and bytes copying (bigger memory chunk might be allocated to keep original stream data plus extra data been written to stream), the benefit of this is that stream data will be located in the single memory chunk. If we don't use "reallocate" strategy - when internal Buffer gets overloaded it will be appended to the CompositeBuffer and new window Buffer will be allocated then.

Returns:

true if "reallocate" strategy is used or false otherwise.

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

write

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

Overrides:

write in class OutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException

reset

public void reset()

allocateNewBuffer

protected Buffer allocateNewBuffer(MemoryManager memoryManager,
                                   int size)