Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.ServiceModel.Discovery / System / ServiceModel / Discovery / RandomDelayQueuedSendsAsyncResult.cs / 1305376 / RandomDelayQueuedSendsAsyncResult.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.ServiceModel.Discovery { using System.Runtime; using System.Threading; using System.Collections.Generic; abstract class RandomDelayQueuedSendsAsyncResult: IteratorAsyncResult > where TItem : class { readonly InputQueue itemQueue; readonly Random random; readonly double maxRandomDelayInMillis; readonly int[] preCalculatedDelays; readonly bool doDelay; static AsyncStep dequeueStep; static AsyncStep delayStep; static AsyncStep sendItemStep; TItem currentItem; int currentDelayIndex; public RandomDelayQueuedSendsAsyncResult( TimeSpan maxRandomDelay, InputQueue itemQueue, AsyncCallback callback, object state) : base(callback, state) { Fx.Assert(maxRandomDelay >= TimeSpan.Zero, "The maxRandomDelay parameter must be non negative."); Fx.Assert(itemQueue != null, "The itemQueue parameter must be non null."); this.itemQueue = itemQueue; this.doDelay = maxRandomDelay > TimeSpan.Zero; if (this.doDelay) { this.random = new Random(); this.maxRandomDelayInMillis = maxRandomDelay.TotalMilliseconds; if (this.itemQueue.PendingCount > 0) { this.preCalculatedDelays = new int[this.itemQueue.PendingCount]; this.PreCalculateSendDelays(); } } } public IAsyncResult BeginDelay(AsyncCallback callback, object state) { return new DelayAsyncResult(this, callback, state); } public void EndDelay(IAsyncResult result) { DelayAsyncResult.End(result); } protected override IEnumerator GetAsyncSteps() { while (true) { yield return RandomDelayQueuedSendsAsyncResult .GetDequeueStep(); if (this.currentItem == null) { yield break; } if (this.doDelay) { yield return RandomDelayQueuedSendsAsyncResult .GetDelayStep(); } yield return RandomDelayQueuedSendsAsyncResult .GetSendItemStep(); } } protected void Start(TimeSpan timeout) { this.Start(this, timeout); } protected abstract IAsyncResult OnBeginSendItem( TItem item, TimeSpan timeout, AsyncCallback callback, object state); protected abstract void OnEndSendItem(IAsyncResult result); static AsyncStep GetDequeueStep() { if (dequeueStep == null) { dequeueStep = RandomDelayQueuedSendsAsyncResult .CallAsync( (thisPtr, t, c, s) => thisPtr.itemQueue.BeginDequeue(TimeSpan.MaxValue, c, s), (thisPtr, r) => thisPtr.currentItem = thisPtr.itemQueue.EndDequeue(r)); } return dequeueStep; } static AsyncStep GetDelayStep() { if (delayStep == null) { delayStep = RandomDelayQueuedSendsAsyncResult .CallAsync( (thisPtr, t, c, s) => thisPtr.BeginDelay(c, s), (thisPtr, r) => thisPtr.EndDelay(r)); } return delayStep; } static AsyncStep GetSendItemStep() { if (sendItemStep == null) { sendItemStep = RandomDelayQueuedSendsAsyncResult .CallParallel( (thisPtr, t, c, s) => thisPtr.OnBeginSendItem(thisPtr.currentItem, t, c, s), (thisPtr, r) => thisPtr.OnEndSendItem(r)); } return sendItemStep; } void PreCalculateSendDelays() { this.currentDelayIndex = 0; for (int i = 0; i < this.preCalculatedDelays.Length; i++) { this.preCalculatedDelays[i] = (int)(this.random.NextDouble() * this.maxRandomDelayInMillis); } Array.Sort (this.preCalculatedDelays); } int GetNextDelay() { int delay = 0; if ((this.preCalculatedDelays == null) || (this.preCalculatedDelays.Length == 0)) { delay = (int)(this.maxRandomDelayInMillis * this.random.NextDouble()); } else { if (this.preCalculatedDelays.Length == 1 || this.currentDelayIndex == 0) { delay = this.preCalculatedDelays[0]; } else { this.currentDelayIndex++; if (currentDelayIndex == this.preCalculatedDelays.Length) { this.currentDelayIndex = 1; } delay = this.preCalculatedDelays[this.currentDelayIndex] - this.preCalculatedDelays[this.currentDelayIndex - 1]; } } return delay; } class DelayAsyncResult : AsyncResult { readonly IOThreadTimer delayTimer; static Action
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