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Revised ResizableByteArrayOutputStream as an actual subclass of ByteArrayOutputStream, and consistently applied appropriate ByteArrayOutputStream initial capacities across the codebase

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Issue: SPR-11594
This commit is contained in:
Juergen Hoeller
2014-03-24 22:57:38 +01:00
parent 05213c684c
commit dd7f54c3c0
23 changed files with 165 additions and 233 deletions
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4
spring-core/src/main/java/org/springframework/core/convert/support/PropertiesToStringConverter.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2012 the original author or authors.
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -34,7 +34,7 @@ final class PropertiesToStringConverter implements Converter<Properties, String>
@Override
public String convert(Properties source) {
try {
ByteArrayOutputStream os = new ByteArrayOutputStream();
ByteArrayOutputStream os = new ByteArrayOutputStream(256);
source.store(os, null);
return os.toString("ISO-8859-1");
}

4
spring-core/src/main/java/org/springframework/core/serializer/support/SerializingConverter.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2012 the original author or authors.
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -57,7 +57,7 @@ public class SerializingConverter implements Converter<Object, byte[]> {
*/
@Override
public byte[] convert(Object source) {
ByteArrayOutputStream byteStream = new ByteArrayOutputStream(128);
ByteArrayOutputStream byteStream = new ByteArrayOutputStream(256);
try {
this.serializer.serialize(source, byteStream);
return byteStream.toByteArray();

8
spring-core/src/main/java/org/springframework/core/style/ToStringCreator.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2012 the original author or authors.
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -36,11 +36,11 @@ public class ToStringCreator {
new DefaultToStringStyler(StylerUtils.DEFAULT_VALUE_STYLER);
private StringBuilder buffer = new StringBuilder(512);
private final StringBuilder buffer = new StringBuilder(256);
private ToStringStyler styler;
private final ToStringStyler styler;
private Object object;
private final Object object;
private boolean styledFirstField;

148
spring-core/src/main/java/org/springframework/util/ResizableByteArrayOutputStream.java
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@@ -13,143 +13,79 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.util;
import java.io.IOException;
import java.io.OutputStream;
import java.io.ByteArrayOutputStream;
/**
* A variation of {@link java.io.ByteArrayOutputStream} that:
* An extension of {@link java.io.ByteArrayOutputStream} that:
* <ul>
* <li>has public {@link org.springframework.util.ResizableByteArrayOutputStream#grow(int)} and
* {@link org.springframework.util.ResizableByteArrayOutputStream#resize(int)} methods to get more control
* over the the size of the internal buffer</li>
* <li>does not synchronize on buffer access - so this class should not be used if concurrent access
* to the buffer is expected</li>
* <li>has public {@link org.springframework.util.ResizableByteArrayOutputStream#grow(int)}
* and {@link org.springframework.util.ResizableByteArrayOutputStream#resize(int)} methods
* to get more control over the the size of the internal buffer</li>
* <li>has a higher initial capacity (256) by default</li>
* </ul>
*
* @author Brian Clozel
* @author Juergen Hoeller
* @since 4.0
*/
public class ResizableByteArrayOutputStream extends OutputStream {
public class ResizableByteArrayOutputStream extends ByteArrayOutputStream {
private static final int INITIAL_BUFFER_SIZE = 32;
private static final int DEFAULT_INITIAL_CAPACITY = 256;
protected byte[] buffer;
protected int count;
/**
* Create a new <code>ByteArrayOutputStream</code> with the default buffer size of 32 bytes.
* Create a new <code>ResizableByteArrayOutputStream</code>
* with the default initial capacity of 128 bytes.
*/
public ResizableByteArrayOutputStream() {
this(INITIAL_BUFFER_SIZE);
super(DEFAULT_INITIAL_CAPACITY);
}
/**
* Create a new <code>ByteArrayOutputStream</code> with a specified initial buffer size.
*
* @param size The initial buffer size in bytes
* Create a new <code>ResizableByteArrayOutputStream</code>
* with the specified initial capacity.
* @param initialCapacity the initial buffer size in bytes
*/
public ResizableByteArrayOutputStream(int size) {
buffer = new byte[size];
count = 0;
public ResizableByteArrayOutputStream(int initialCapacity) {
super(initialCapacity);
}
/**
* Return the size of the internal buffer.
*/
public int size() {
return buffer.length;
}
/**
* Return the number of bytes that have been written to the buffer so far.
*/
public int count() {
return count;
}
/**
* Discard all bytes written to the internal buffer by setting the <code>count</code> variable to 0.
*/
public void reset() {
count = 0;
}
/**
* Grow the internal buffer size
* @param add number of bytes to add to the current buffer size
* Resize the internal buffer size to a specified capacity.
* @param targetCapacity the desired size of the buffer
* @throws IllegalArgumentException if the given capacity is smaller than
* the actual size of the content stored in the buffer already
* @see ResizableByteArrayOutputStream#size()
*/
public void grow(int add) {
if (count + add > buffer.length) {
int newlen = Math.max(buffer.length * 2, count + add);
resize(newlen);
public synchronized void resize(int targetCapacity) {
Assert.isTrue(targetCapacity >= this.count, "New capacity must not be smaller than current size");
byte[] resizedBuffer = new byte[targetCapacity];
System.arraycopy(this.buf, 0, resizedBuffer, 0, this.count);
this.buf = resizedBuffer;
}
/**
* Grow the internal buffer size.
* @param additionalCapacity the number of bytes to add to the current buffer size
* @see ResizableByteArrayOutputStream#size()
*/
public synchronized void grow(int additionalCapacity) {
Assert.isTrue(additionalCapacity >= 0, "Additional capacity must be 0 or higher");
if (this.count + additionalCapacity > this.buf.length) {
int newCapacity = Math.max(this.buf.length * 2, this.count + additionalCapacity);
resize(newCapacity);
}
}
/**
* Resize the internal buffer size to a specified value
* @param size the size of the buffer
* @throws java.lang.IllegalArgumentException if the given size is
* smaller than the actual size of the content stored in the buffer
* @see ResizableByteArrayOutputStream#size()
* Return the current size of this stream's internal buffer.
*/
public void resize(int size) {
Assert.isTrue(size >= count);
byte[] newbuf = new byte[size];
System.arraycopy(buffer, 0, newbuf, 0, count);
buffer = newbuf;
}
/**
* Write the specified byte into the internal buffer, thus incrementing the
* {{@link org.springframework.util.ResizableByteArrayOutputStream#count()}}
* @param oneByte the byte to be written in the buffer
* @see ResizableByteArrayOutputStream#count()
*/
public void write(int oneByte) {
grow(1);
buffer[count++] = (byte) oneByte;
}
/**
* Write <code>add</code> bytes from the passed in array
* <code>inBuffer</code> starting at index <code>offset</code> into the
* internal buffer.
*
* @param inBuffer The byte array to write data from
* @param offset The index into the buffer to start writing data from
* @param add The number of bytes to write
* @see ResizableByteArrayOutputStream#count()
*/
public void write(byte[] inBuffer, int offset, int add) {
if (add >= 0) {
grow(add);
}
System.arraycopy(inBuffer, offset, buffer, count, add);
count += add;
}
/**
* Write all bytes that have been written to the specified <code>OutputStream</code>.
*
* @param out The <code>OutputStream</code> to write to
* @exception IOException If an error occurs
*/
public void writeTo(OutputStream out) throws IOException {
out.write(buffer, 0, count);
}
/**
* Return a byte array containing the bytes that have been written to this stream so far.
*/
public byte[] toByteArray() {
byte[] ret = new byte[count];
System.arraycopy(buffer, 0, ret, 0, count);
return ret;
public synchronized int capacity() {
return this.buf.length;
}
}

4
spring-core/src/main/java/org/springframework/util/SerializationUtils.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2010 the original author or authors.
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -39,7 +39,7 @@ public abstract class SerializationUtils {
if (object == null) {
return null;
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
try {
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(object);