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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.Runtime.CompilerServices;
namespace Qpid.Buffer
{
/// <summary>
/// A simplistic <see cref="ByteBufferAllocator"/> which simply allocates a new
/// buffer every time
/// </summary>
public class SimpleByteBufferAllocator : IByteBufferAllocator
{
private const int MINIMUM_CAPACITY = 1;
public SimpleByteBufferAllocator()
{
}
public ByteBuffer Allocate( int capacity, bool direct )
{
FixedByteBuffer nioBuffer;
if( direct )
{
nioBuffer = FixedByteBuffer.allocateDirect( capacity );
}
else
{
nioBuffer = FixedByteBuffer.allocate( capacity );
}
return new SimpleByteBuffer( nioBuffer );
}
public ByteBuffer Wrap( FixedByteBuffer nioBuffer )
{
return new SimpleByteBuffer( nioBuffer );
}
public void Dispose()
{
}
private class SimpleByteBuffer : BaseByteBuffer
{
private FixedByteBuffer _buf;
private int refCount = 1;
internal SimpleByteBuffer( FixedByteBuffer buf )
{
this._buf = buf;
buf.order( ByteOrder.BigEndian );
refCount = 1;
}
[MethodImpl(MethodImplOptions.Synchronized)]
public override void acquire()
{
if( refCount <= 0 )
{
throw new InvalidOperationException("Already released buffer.");
}
refCount ++;
}
public override void release()
{
lock( this )
{
if( refCount <= 0 )
{
refCount = 0;
throw new InvalidOperationException(
"Already released buffer. You released the buffer too many times." );
}
refCount --;
if( refCount > 0)
{
return;
}
}
}
public override FixedByteBuffer buf()
{
return _buf;
}
public override bool isPooled()
{
return false;
}
public override void setPooled(bool pooled)
{
}
protected override void capacity0(int requestedCapacity)
{
int newCapacity = MINIMUM_CAPACITY;
while( newCapacity < requestedCapacity )
{
newCapacity <<= 1;
}
FixedByteBuffer oldBuf = this._buf;
FixedByteBuffer newBuf;
if( isDirect() )
{
newBuf = FixedByteBuffer.allocateDirect( newCapacity );
}
else
{
newBuf = FixedByteBuffer.allocate( newCapacity );
}
newBuf.clear();
oldBuf.clear();
newBuf.put( oldBuf );
this._buf = newBuf;
}
public override ByteBuffer duplicate() {
return new SimpleByteBuffer( this._buf.duplicate() );
}
public override ByteBuffer slice()
{
return new SimpleByteBuffer( this._buf.slice() );
}
public override ByteBuffer asReadOnlyBuffer()
{
return new SimpleByteBuffer( this._buf.asReadOnlyBuffer() );
}
public override byte[] array()
{
return _buf.array();
}
public override int arrayOffset()
{
return _buf.arrayOffset();
}
public override void put(ushort value)
{
_buf.put(value);
}
public override void put(uint max)
{
_buf.put(max);
}
public override void put(ulong tag)
{
_buf.put(tag);
}
public override ulong GetUnsignedLong()
{
return _buf.getUnsignedLong();
}
}
}
}
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