剛剛騷情的跑了下NLog測試，，，，，一篇文章就那么Crash了~~~
好吧，這次簡化下，直接進入正題，有關(guān)GC的東東參考網(wǎng)上大部分文章吧。

源碼分析

// StringBuilder 的建立也會耗費大量的資源，因此共用他們，使用這個類來管理池子 //需要了從這里獲取一個，用完自動釋放 ItemHolder 即可釋放會池子 // 例如 using (var itemHolder = pool.Acquire()){} internal class StringBuilderPool{private StringBuilder _fastPool;private readonly StringBuilder[] _slowPool;private readonly int _maxBuilderCapacity;/// <summary>/// Constructor/// </summary>/// <param name="poolCapacity">Max number of items</param>/// <param name="initialBuilderCapacity">Initial StringBuilder Size</param>/// <param name="maxBuilderCapacity">Max StringBuilder Size</param>public StringBuilderPool(int poolCapacity, int initialBuilderCapacity = 1024, int maxBuilderCapacity = 512 * 1024){//一個快速池子，一直保持_fastPool = new StringBuilder(10 * initialBuilderCapacity);// 一個慢速池子，如果快速池子被占用，則從慢速池子取一個_slowPool = new StringBuilder[poolCapacity];for (int i = 0; i < _slowPool.Length; ++i){_slowPool[i] = new StringBuilder(initialBuilderCapacity);}_maxBuilderCapacity = maxBuilderCapacity;}/// <summary>/// Takes StringBuilder from pool/// </summary>/// <returns>Allow return to pool</returns>public ItemHolder Acquire(){//1.come on baby，先嘗試分配快速池子StringBuilder item = _fastPool;//2.如果你幸運的拿到快速池子，則盡快把快速池子置空，不要讓別人搶到了，否則，你就必須進慢速池子取了if (item == null || item != Interlocked.CompareExchange(ref _fastPool, null, item)){//3.你好，兄弟，你已經(jīng)進入慢車道，來，一個個給你試試能用不for (int i = 0; i < _slowPool.Length; i++){item = _slowPool[i];if (item != null && item == Interlocked.CompareExchange(ref _slowPool[i], null, item)){//4.啊哈，發(fā)現(xiàn)一個慢速的，來，給你，別嫌棄return new ItemHolder(item, this, i);}}//這么倒霉，一個都沒有，算了，再給你分配一個新的吧，記住，你的編號~~~咦， 第0個吧~~~return new ItemHolder(new StringBuilder(), null, 0);}else{//你是幸運之星，快速跑~~~~return new ItemHolder(item, this, -1);}}/// <summary>/// Releases StringBuilder back to pool at its right place/// </summary>private void Release(StringBuilder stringBuilder, int poolIndex){//來，兄弟，好借好還，再借不難//什么，這么大，我記得借你時沒這么大啊，讓我再檢查檢查if (stringBuilder.Length > _maxBuilderCapacity){//我靠，你是快車道的，那就給你10倍大小如何，這都超了，那對不起，減半了~~// Avoid high memory usage by not keeping huge StringBuilders alive (Except one StringBuilder)int maxBuilderCapacity = poolIndex == -1 ? _maxBuilderCapacity * 10 : _maxBuilderCapacity;if (stringBuilder.Length > maxBuilderCapacity){stringBuilder = new StringBuilder(maxBuilderCapacity / 2);}}stringBuilder.Length = 0;//好，各就各位...if (poolIndex == -1){_fastPool = stringBuilder;}else{_slowPool[poolIndex] = stringBuilder;}}//下面是個池化對象類/// <summary>/// Keeps track of acquired pool item/// </summary>public struct ItemHolder : IDisposable{public readonly StringBuilder Item;readonly StringBuilderPool _owner;readonly int _poolIndex;public ItemHolder(StringBuilder stringBuilder, StringBuilderPool owner, int poolIndex){Item = stringBuilder;_owner = owner;_poolIndex = poolIndex;}/// <summary>/// Releases pool item back into pool/// </summary>public void Dispose(){if (_owner != null){_owner.Release(Item, _poolIndex);}}}}

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