net.sf.ehcache.util
Class MemoryEfficientByteArrayOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.ByteArrayOutputStream
          net.sf.ehcache.util.MemoryEfficientByteArrayOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public final class MemoryEfficientByteArrayOutputStream
extends java.io.ByteArrayOutputStream

This class is designed to minimise the number of System.arraycopy(); methods required to complete. ByteArrayOutputStream in the JDK is tuned for a wide variety of purposes. This sub-class starts with an initial size which is a closer match for ehcache usage.

Version:

$Id$

Author:

Greg Luck

Field Summary

Fields inherited from class java.io.ByteArrayOutputStream

buf, count

Constructor Summary

MemoryEfficientByteArrayOutputStream(int size)
Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Method Summary

byte[]	getBytes() Gets the bytes.
static MemoryEfficientByteArrayOutputStream	serialize(java.io.Serializable serializable) Factory method.
static MemoryEfficientByteArrayOutputStream	serialize(java.io.Serializable serializable, int estimatedPayloadSize) Factory method

Methods inherited from class java.io.ByteArrayOutputStream

close, reset, size, toByteArray, toString, toString, toString, write, write, writeTo

Methods inherited from class java.io.OutputStream

flush, write

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryEfficientByteArrayOutputStream

public MemoryEfficientByteArrayOutputStream(int size)

Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Parameters:

size - the initial size.

Method Detail

getBytes

public byte[] getBytes()

Gets the bytes. Not all may be valid. Use only up to getSize()

Returns:

the underlying byte[]

serialize

public static MemoryEfficientByteArrayOutputStream serialize(java.io.Serializable serializable,
                                                             int estimatedPayloadSize)
                                                      throws java.io.IOException

Factory method

Parameters:

serializable - any Object that implements Serializable

estimatedPayloadSize - how many bytes is expected to be in the Serialized representation

Returns:

a ByteArrayOutputStream with a Serialized object in it

Throws:

java.io.IOException - if something goes wrong with the Serialization

serialize

public static MemoryEfficientByteArrayOutputStream serialize(java.io.Serializable serializable)
                                                      throws java.io.IOException

Factory method. This method optimises memory by trying to make a better guess than the Java default of 32 bytes by assuming the starting point for the serialized size will be what it was last time this method was called.

Parameters:

serializable - any Object that implements Serializable

Returns:

a ByteArrayOutputStream with a Serialized object in it

Throws:

java.io.IOException - if something goes wrong with the Serialization