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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
using System;
using System.Text;
namespace Qpid.Buffer
{
public class RefCountingByteBuffer : ByteBuffer
{
private ByteBuffer _buf;
private int _refCount = 1;
private bool _autoExpand;
private bool _pooled;
public void Init(ByteBuffer buf)
{
lock (this)
{
_buf = buf;
buf.Clear();
_autoExpand = false;
_pooled = true;
_refCount = 1;
}
}
public override void Acquire()
{
lock (this)
{
if (_refCount <= 0)
{
throw new Exception("Already released buffer");
}
_refCount++;
}
}
public override void Release()
{
lock (this)
{
if (_refCount <= 0)
{
_refCount = 0;
throw new Exception("Already released buffer. Release called too many times");
}
_refCount--;
if (_refCount > 0)
{
return;
}
}
if (_pooled)
{
Release0(_buf);
}
lock (_containerStack)
{
_containerStack.Push(this);
}
}
public ByteBuffer Buf
{
get
{
return _buf;
}
}
public override bool IsAutoExpand
{
get
{
return _autoExpand;
}
set
{
_autoExpand = value;
}
}
public override bool Pooled
{
get
{
return _pooled;
}
set
{
_pooled = value;
}
}
public override int Capacity
{
get
{
return _buf.Capacity;
}
}
public override int Position
{
get
{
return _buf.Position;
}
set
{
AutoExpand(value, 0);
_buf.Position = value;
}
}
public override int Limit
{
get
{
return _buf.Limit;
}
set
{
AutoExpand(value, 0);
_buf.Limit = value;
}
}
/*public override void Mark()
{
_buf.Mark();
}
public override void Reset()
{
_buf.Reset();
}*/
public override void Clear()
{
_buf.Clear();
}
public override void Flip()
{
_buf.Flip();
}
public override void Rewind()
{
_buf.Rewind();
}
public override int Remaining
{
get
{
return _buf.Remaining;
}
}
public override byte Get()
{
return _buf.Get();
}
public override void Put(byte data)
{
AutoExpand(1);
_buf.Put(data);
}
public override byte Get(int index)
{
return _buf.Get(index);
}
public override void Compact()
{
_buf.Compact();
}
public override void Get(byte[] destination)
{
_buf.Get(destination);
}
public override ushort GetUnsignedShort()
{
return _buf.GetUnsignedShort();
}
public override uint GetUnsignedInt()
{
return _buf.GetUnsignedInt();
}
public override ulong GetUnsignedLong()
{
return _buf.GetUnsignedLong();
}
public override string GetString(uint length, Encoding encoder)
{
return _buf.GetString(length, encoder);
}
public override void Put(byte[] data)
{
AutoExpand(data.Length);
_buf.Put(data);
}
public override void Put(byte[] data, int offset, int size)
{
AutoExpand(size);
_buf.Put(data, offset, size);
}
public override void Put(ushort data)
{
AutoExpand(2);
_buf.Put(data);
}
public override void Put(uint data)
{
AutoExpand(4);
_buf.Put(data);
}
public override void Put(ulong data)
{
AutoExpand(8);
_buf.Put(data);
}
public override void Put(ByteBuffer buf)
{
AutoExpand(buf.Remaining);
_buf.Put(buf);
}
public override void Expand(int expectedRemaining)
{
if (_autoExpand)
{
int pos = _buf.Position;
int limit = _buf.Limit;
int end = pos + expectedRemaining;
if (end > limit)
{
EnsureCapacity(end);
_buf.Limit = end;
}
}
}
public override void Expand(int pos, int expectedRemaining)
{
if (_autoExpand)
{
int limit = _buf.Limit;
int end = pos + expectedRemaining;
if (end > limit)
{
EnsureCapacity(end);
_buf.Limit = end;
}
}
}
private void EnsureCapacity(int requestedCapacity)
{
if (requestedCapacity <= _buf.Capacity)
{
return;
}
int newCapacity = MINIMUM_CAPACITY;
while (newCapacity < requestedCapacity)
{
newCapacity <<= 1;
}
ByteBuffer oldBuf = _buf;
ByteBuffer newBuf = Allocate0(newCapacity, false);
newBuf.Clear();
int pos = oldBuf.Position;
int limit = oldBuf.Limit;
oldBuf.Clear();
newBuf.Put(oldBuf);
newBuf.Position = pos;
newBuf.Limit = limit;
_buf = newBuf;
Release0(oldBuf);
}
public override byte[] ToByteArray()
{
return _buf.ToByteArray();
}
public override string ToString()
{
return "RefCountingByteBuffer: refs= " + _refCount + "buf=" + base.ToString();
}
}
}
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