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ByteAccumulator.java
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ByteAccumulator.java
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//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.websocket.common.extensions.compress;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.websocket.api.MessageTooLargeException;
public class ByteAccumulator
{
private List<ByteBuffer> prevChunks = null;
private List<ByteBuffer> nextChunks = new ArrayList<>();
private final int maxSize;
private int length = 0;
private int index;
public ByteAccumulator(int maxOverallBufferSize)
{
this.maxSize = maxOverallBufferSize;
}
public void copyChunk(byte[] buf, int offset, int length)
{
if (this.length + length > maxSize)
{
String err = String.format("Resulting message size [%,d] is too large for configured max of [%,d]", this.length + length, maxSize);
throw new MessageTooLargeException(err);
}
nextChunks.add(ByteBuffer.wrap(buf, offset, length));
this.length += length;
}
public int getLength()
{
return length;
}
int getMaxSize()
{
return maxSize;
}
ByteBuffer newByteBuffer(int size)
{
ByteBuffer buf;
if (prevChunks != null && prevChunks.size() > index)
{
buf = prevChunks.get(index);
}
else
{
buf = ByteBuffer.allocate(size);
}
index++;
return buf;
}
public void transferTo(ByteBuffer buffer)
{
if (buffer.remaining() < length)
{
throw new IllegalArgumentException(String.format("Not enough space in ByteBuffer remaining [%d] for accumulated buffers length [%d]",
buffer.remaining(), length));
}
int position = buffer.position();
for (ByteBuffer chunk : nextChunks)
{
buffer.put(chunk);
}
BufferUtil.flipToFlush(buffer, position);
}
void recycle()
{
index = 0;
length = 0;
int resize = 16;
if (prevChunks == null || nextChunks.size() > prevChunks.size())
{
prevChunks = nextChunks;
}
// keep prevChunks retain max resize elements
if (prevChunks.size() > resize)
{
prevChunks.subList(resize, prevChunks.size()).clear();
}
nextChunks = new ArrayList<>();
}
}