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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.Runtime;
class ConnectionBufferPool : QueuedObjectPool<byte[]>
{
const int SingleBatchSize = 128 * 1024;
const int MaxBatchCount = 16;
const int MaxFreeCountFactor = 4;
int bufferSize;
public ConnectionBufferPool(int bufferSize)
{
int batchCount = ComputeBatchCount(bufferSize);
this.Initialize(bufferSize, batchCount, batchCount * MaxFreeCountFactor);
}
public ConnectionBufferPool(int bufferSize, int maxFreeCount)
{
this.Initialize(bufferSize, ComputeBatchCount(bufferSize), maxFreeCount);
}
void Initialize(int bufferSize, int batchCount, int maxFreeCount)
{
Fx.Assert(bufferSize >= 0, "bufferSize must be non-negative");
Fx.Assert(batchCount > 0, "batchCount must be positive");
Fx.Assert(maxFreeCount >= 0, "maxFreeCount must be non-negative");
this.bufferSize = bufferSize;
if (maxFreeCount < batchCount)
{
maxFreeCount = batchCount;
}
base.Initialize(batchCount, maxFreeCount);
}
public int BufferSize
{
get
{
return this.bufferSize;
}
}
protected override byte[] Create()
{
return DiagnosticUtility.Utility.AllocateByteArray(this.bufferSize);
}
static int ComputeBatchCount(int bufferSize)
{
int batchCount;
if (bufferSize != 0)
{
batchCount = (SingleBatchSize + bufferSize - 1) / bufferSize;
if (batchCount > MaxBatchCount)
{
batchCount = MaxBatchCount;
}
}
else
{
// It's OK to have zero bufferSize
batchCount = MaxBatchCount;
}
return batchCount;
}
}
}
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