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2541405
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0
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2010-03-29T21:28:13.300
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2010-03-29T21:28:13.300
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<p>You should be able to put together a wrapper class that manages a single byte[] buffer and parcels out temporary locks for data ranges using fixed-size memory streams. Essentially, you define your buffer once, and anytime you want to work with it, you request a lock object from the ConcurrentBuffer class. The lock contains a MemoryStream which is guaranteed to have exclusive access to the index ranges you specified when you requested the lock until you release it.</p> <p>I've thrown together a simple example that should provide you with a good starting point:</p> <pre><code>public class ConcurrentBuffer { private readonly byte[] buffer; internal byte[] GetBuffer() { return buffer; } private List<BufferLock> locks = new List<BufferLock>(); public ConcurrentBuffer(int bufferSize) { buffer = new byte[bufferSize]; } public BufferLock AcquireLock(int startIndex, int endIndex) { if (startIndex < 0) throw new ArgumentOutOfRangeException("startIndex"); if (startIndex > endIndex || endIndex >= buffer.Length) throw new ArgumentOutOfRangeException("endIndex"); lock (buffer) { foreach (var l in locks) { if (!(endIndex < l.StartIndex || startIndex > l.EndIndex)) { return null; } } var bl = new BufferLock(startIndex, endIndex, this); locks.Add(bl); return bl; } } public void ReleaseLock(BufferLock lck) { lock (buffer) { locks.Remove(lck); } } public class BufferLock { public int StartIndex { get; private set; } public int EndIndex { get; private set; } public ConcurrentBuffer TargetBuffer { get; private set; } public MemoryStream Stream { get; private set; } internal BufferLock(int startIndex, int endIndex, ConcurrentBuffer buffer) { StartIndex = startIndex; EndIndex = endIndex; TargetBuffer = buffer; Stream = new MemoryStream(buffer.GetBuffer(), startIndex, endIndex - startIndex, true); } public void Release() { Stream.Dispose(); TargetBuffer.ReleaseLock(this); } } } class Program { static void Main(string[] args) { ConcurrentBuffer cb = new ConcurrentBuffer(32000); byte[] myData = { 32, 13, 53, 29, 50 }; // l1 will acquire a lock var l1 = cb.AcquireLock(0, 50); if (l1 != null) l1.Stream.Write(myData, 0, myData.Length); // l2 will fail because l1 has part of its range locked var l2 = cb.AcquireLock(30, 70); if (l2 != null) l2.Stream.Write(myData, 0, myData.Length); l1.Release(); // l3 will succeed at locking because l1 has been released var l3 = cb.AcquireLock(40, 5000); if (l3 != null) { while (l3.Stream.Position + myData.Length <= l3.Stream.Length) { l3.Stream.Write(myData, 0, myData.Length); } } l3.Release(); Console.ReadLine(); } } </code></pre>
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1. PO.net real time stream processing - needed huge and fast RAM buffer
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