Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / BufferAllocator.cs / 1 / BufferAllocator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * Buffer Allocators with recycling * * Copyright (c) 1999 Microsoft Corporation */ namespace System.Web { using System.Collections; using System.IO; using System.Globalization; using System.Web.Util; ////////////////////////////////////////////////////////////////////////////// // Generic buffer recycling /* * Base class for allocator doing buffer recycling */ internal abstract class BufferAllocator { private int _maxFree; private int _numFree; private Stack _buffers; private static int s_ProcsFudgeFactor; static BufferAllocator() { s_ProcsFudgeFactor = SystemInfo.GetNumProcessCPUs(); if (s_ProcsFudgeFactor < 1) s_ProcsFudgeFactor = 1; if (s_ProcsFudgeFactor > 4) s_ProcsFudgeFactor = 4; } internal BufferAllocator(int maxFree) { _buffers = new Stack(); _numFree = 0; _maxFree = maxFree * s_ProcsFudgeFactor; } internal /*public*/ Object GetBuffer() { Object buffer = null; if (_numFree > 0) { lock(this) { if (_numFree > 0) { buffer = _buffers.Pop(); _numFree--; } } } if (buffer == null) buffer = AllocBuffer(); return buffer; } internal void ReuseBuffer(Object buffer) { if (_numFree < _maxFree) { lock(this) { if (_numFree < _maxFree) { _buffers.Push(buffer); _numFree++; } } } } /* * To be implemented by a derived class */ abstract protected Object AllocBuffer(); } /* * Concrete allocator class for ubyte[] buffer recycling */ internal class UbyteBufferAllocator : BufferAllocator { private int _bufferSize; internal UbyteBufferAllocator(int bufferSize, int maxFree) : base(maxFree) { _bufferSize = bufferSize; } protected override Object AllocBuffer() { return new byte[_bufferSize]; } } /* * Concrete allocator class for char[] buffer recycling */ internal class CharBufferAllocator : BufferAllocator { private int _bufferSize; internal CharBufferAllocator(int bufferSize, int maxFree) : base(maxFree) { _bufferSize = bufferSize; } protected override Object AllocBuffer() { return new char[_bufferSize]; } } /* * Concrete allocator class for int[] buffer recycling */ internal class IntegerArrayAllocator : BufferAllocator { private int _arraySize; internal IntegerArrayAllocator(int arraySize, int maxFree) : base(maxFree) { _arraySize = arraySize; } protected override Object AllocBuffer() { return new int[_arraySize]; } } /* * Concrete allocator class for IntPtr[] buffer recycling */ internal class IntPtrArrayAllocator : BufferAllocator { private int _arraySize; internal IntPtrArrayAllocator(int arraySize, int maxFree) : base(maxFree) { _arraySize = arraySize; } protected override Object AllocBuffer() { return new IntPtr[_arraySize]; } } }
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