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
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ProfileEventArgs.cs
- XmlElementList.cs
- webeventbuffer.cs
- StringSorter.cs
- MouseBinding.cs
- BinaryNode.cs
- StyleConverter.cs
- Converter.cs
- EmptyEnumerator.cs
- BaseTypeViewSchema.cs
- TreeView.cs
- XNameTypeConverter.cs
- TransformedBitmap.cs
- PeerCollaboration.cs
- GifBitmapDecoder.cs
- Int16Animation.cs
- ListBindableAttribute.cs
- SignedXmlDebugLog.cs
- TimeSpanSecondsConverter.cs
- ManifestResourceInfo.cs
- Buffer.cs
- HitTestDrawingContextWalker.cs
- dsa.cs
- ConnectionsZone.cs
- ClientConfigurationSystem.cs
- SafeThemeHandle.cs
- BamlWriter.cs
- SqlConnectionString.cs
- ConnectionPoint.cs
- UdpSocketReceiveManager.cs
- ShaderEffect.cs
- RegexGroupCollection.cs
- SqlBuilder.cs
- CapabilitiesRule.cs
- XmlReturnWriter.cs
- SharedDp.cs
- ConfigUtil.cs
- Light.cs
- PackageDigitalSignatureManager.cs
- NeutralResourcesLanguageAttribute.cs
- StorageAssociationTypeMapping.cs
- CommonProperties.cs
- PageStatePersister.cs
- QueryContext.cs
- BuildResult.cs
- DeferredTextReference.cs
- DesignerDataTable.cs
- Button.cs
- FontEmbeddingManager.cs
- KeyValuePair.cs
- WebPageTraceListener.cs
- WebPartCatalogCloseVerb.cs
- securitycriticaldataformultiplegetandset.cs
- TableLayoutSettings.cs
- WrapPanel.cs
- LessThanOrEqual.cs
- DeferrableContentConverter.cs
- SoapFormatExtensions.cs
- SecurityTraceRecordHelper.cs
- FormViewPageEventArgs.cs
- ValidationErrorCollection.cs
- WSDualHttpBindingCollectionElement.cs
- MarshalByRefObject.cs
- SiteMapPath.cs
- StorageEntityTypeMapping.cs
- HandlerFactoryCache.cs
- DelegatingTypeDescriptionProvider.cs
- UrlAuthFailureHandler.cs
- IndexedEnumerable.cs
- DataGridViewIntLinkedList.cs
- FileSystemInfo.cs
- InstanceHandleConflictException.cs
- ToolStripLocationCancelEventArgs.cs
- TailCallAnalyzer.cs
- DataGridViewCellCancelEventArgs.cs
- sortedlist.cs
- TextLineResult.cs
- RequestQueue.cs
- HttpTransportBindingElement.cs
- TripleDESCryptoServiceProvider.cs
- AuthenticationModulesSection.cs
- UIElementCollection.cs
- FastEncoderWindow.cs
- KeyEventArgs.cs
- NativeBuffer.cs
- HotSpot.cs
- InternalDispatchObject.cs
- GatewayDefinition.cs
- PackageStore.cs
- RayMeshGeometry3DHitTestResult.cs
- SystemColors.cs
- AssertValidation.cs
- XNodeNavigator.cs
- BrowserInteropHelper.cs
- AppDomainUnloadedException.cs
- LicFileLicenseProvider.cs
- BufferedGraphicsContext.cs
- MarkupObject.cs
- ControlIdConverter.cs
- WebPartConnection.cs