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// **********************************************************************
//
// Copyright (c) 2002
// ZeroC, Inc.
// Billerica, MA, USA
//
// All Rights Reserved.
//
// Ice is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// **********************************************************************
package IceInternal;
final class BufferManager
{
BufferManager()
{
_head = null;
}
java.nio.ByteBuffer
allocate(int size)
{
java.nio.ByteBuffer buf = getBuffer(size);
if(buf == null)
{
try
{
//buf = java.nio.ByteBuffer.allocateDirect(size);
buf = java.nio.ByteBuffer.allocate(size);
}
catch(OutOfMemoryError ex)
{
Ice.MemoryLimitException e = new Ice.MemoryLimitException();
e.initCause(ex);
throw e;
}
buf.order(java.nio.ByteOrder.LITTLE_ENDIAN);
}
return buf;
}
java.nio.ByteBuffer
reallocate(java.nio.ByteBuffer old, int size)
{
java.nio.ByteBuffer buf = getBuffer(size);
if(buf == null)
{
try
{
//buf = java.nio.ByteBuffer.allocateDirect(size);
buf = java.nio.ByteBuffer.allocate(size);
}
catch(OutOfMemoryError ex)
{
Ice.MemoryLimitException e = new Ice.MemoryLimitException();
e.initCause(ex);
throw e;
}
buf.order(java.nio.ByteOrder.LITTLE_ENDIAN);
}
old.position(0);
buf.put(old);
reclaim(old);
return buf;
}
synchronized void
reclaim(java.nio.ByteBuffer buf)
{
BufferNode node;
if(_nodeCache == null)
{
node = new BufferNode();
}
else
{
node = _nodeCache;
_nodeCache = _nodeCache.next;
}
node.buf = buf;
node.capacity = buf.capacity();
node.next = _head;
_head = node;
}
private synchronized java.nio.ByteBuffer
getBuffer(int size)
{
BufferNode node = _head;
BufferNode prev = null;
while(node != null)
{
if(size <= node.capacity)
{
break;
}
prev = node;
node = node.next;
}
if(node != null)
{
if(prev != null)
{
prev.next = node.next;
}
else
{
_head = node.next;
}
node.next = _nodeCache;
_nodeCache = node;
node.buf.clear();
return node.buf;
}
else
{
return null;
}
}
private static final class BufferNode
{
java.nio.ByteBuffer buf;
int capacity;
BufferNode next;
}
private BufferNode _head;
private BufferNode _nodeCache;
}
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