Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.ServiceModel.Discovery / System / ServiceModel / Discovery / AnnouncementDispatcherAsyncResult.cs / 1305376 / AnnouncementDispatcherAsyncResult.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.ServiceModel.Discovery { using System.Collections.ObjectModel; using System.Runtime; using System.Threading; using System.Xml; class AnnouncementDispatcherAsyncResult : AsyncResult { readonly AnnouncementSendsAsyncResult[] innerResults; [Fx.Tag.SynchronizationObject(Blocking = false, Kind = Fx.Tag.SynchronizationKind.InterlockedNoSpin)] int completions; AsyncCallback onAnnouncementSendsCompletedCallback; [Fx.Tag.SynchronizationObject(Blocking = false, Kind = Fx.Tag.SynchronizationKind.InterlockedNoSpin)] int completesCounter; bool cancelled; [Fx.Tag.SynchronizationObject()] object thisLock; public AnnouncementDispatcherAsyncResult( Collectionendpoints, Collection metadatas, DiscoveryMessageSequenceGenerator discoveryMessageSequenceGenerator, bool online, AsyncCallback callback, object state ) : base(callback, state) { if (metadatas.Count == 0) { Complete(true); return; } bool success = false; this.cancelled = false; this.thisLock = new object(); this.innerResults = new AnnouncementSendsAsyncResult[endpoints.Count]; this.onAnnouncementSendsCompletedCallback = Fx.ThunkCallback(new AsyncCallback(OnAnnouncementSendsCompleted)); Collection messageIds = AllocateMessageIds(metadatas.Count); try { Random random = new Random(); for (int i = 0; i < this.innerResults.Length; i++) { AnnouncementClient announcementClient = new AnnouncementClient(endpoints[i]); announcementClient.MessageSequenceGenerator = discoveryMessageSequenceGenerator; this.innerResults[i] = new AnnouncementSendsAsyncResult( announcementClient, metadatas, messageIds, online, endpoints[i].MaxAnnouncementDelay, random, this.onAnnouncementSendsCompletedCallback, this); } success = true; } finally { if (!success) { this.Cancel(); } } } public void Start(TimeSpan timeout, bool canCompleteSynchronously) { if (this.IsCompleted || this.cancelled) { return; } bool synchronousCompletion = canCompleteSynchronously; Exception error = null; bool complete = false; try { for (int i = 0; i < this.innerResults.Length; i++) { this.innerResults[i].Start(timeout); if (this.innerResults[i].CompletedSynchronously) { AnnouncementSendsAsyncResult.End(this.innerResults[i]); complete = (Interlocked.Increment(ref this.completions) == innerResults.Length); } else { synchronousCompletion = false; } } } catch (Exception e) { if (Fx.IsFatal(e)) { throw; } error = e; } if (error != null) { CallCompleteOnce(synchronousCompletion, error); } else if (complete) { CallCompleteOnce(synchronousCompletion, null); } } void OnAnnouncementSendsCompleted(IAsyncResult result) { if (!result.CompletedSynchronously) { Exception error = null; try { AnnouncementSendsAsyncResult.End(result); } catch (Exception e) { if (Fx.IsFatal(e)) { throw; } error = e; } if (error != null) { CallCompleteOnce(false, error); } else { if (Interlocked.Increment(ref this.completions) == innerResults.Length) { CallCompleteOnce(false, null); } } } } public void Cancel() { if (!this.cancelled) { bool doCancel = false; lock (this.thisLock) { if (!this.cancelled) { doCancel = true; this.cancelled = true; } } if (doCancel) { for (int i = 0; i < this.innerResults.Length; i++) { if (this.innerResults[i] != null) { this.innerResults[i].Cancel(); } } CompleteOnCancel(); } } } void CompleteOnCancel() { if (Threading.Interlocked.Increment(ref this.completesCounter) == 1) { Complete(false, new OperationCanceledException()); } } void CallCompleteOnce(bool completedSynchronously, Exception e) { if (Threading.Interlocked.Increment(ref this.completesCounter) == 1) { if (e != null) { Cancel(); } Complete(completedSynchronously, e); } } public static void End(IAsyncResult result) { AsyncResult.End (result); } static Collection AllocateMessageIds(int count) { Collection messageIds = new Collection (); for (int i = 0; i < count; i++) { messageIds.Add(new UniqueId()); } return messageIds; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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