Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / TimeoutHelper.cs / 1 / TimeoutHelper.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.ServiceModel { using System; using System.Threading; using System.ServiceModel.Channels; struct TimeoutHelper { internal static TimeSpan DefaultBufferTime { get { return TimeSpan.FromMilliseconds(150); } } internal static TimeSpan Infinite { get { return TimeSpan.MaxValue; } } internal static TimeSpan MaxWait = TimeSpan.FromMilliseconds(Int32.MaxValue); DateTime deadline; bool deadlineSet; TimeSpan originalTimeout; internal void SetDeadline() { DiagnosticUtility.DebugAssert(!deadlineSet, "TimeoutHelper deadline set twice."); this.deadline = DateTime.UtcNow + this.originalTimeout; this.deadlineSet = true; } internal TimeoutHelper(TimeSpan timeout) { if (timeout < TimeSpan.Zero) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("timeout", timeout, SR.GetString(SR.SFxTimeoutOutOfRange0))); } if (IsTooLarge(timeout)) { timeout = MaxWait; } this.originalTimeout = timeout; this.deadline = DateTime.MaxValue; this.deadlineSet = (timeout == TimeSpan.MaxValue); } public TimeSpan OriginalTimeout { get { return this.originalTimeout; } } static public bool IsTooLarge(TimeSpan timeout) { return (timeout > MaxWait) && (timeout != Infinite); } public TimeSpan MinRemainingTime(TimeSpan otherTimeout) { TimeSpan myTimeout = this.RemainingTime(); if (myTimeout < otherTimeout) { return myTimeout; } else { return otherTimeout; } } public TimeSpan MinRemainingTime(TimeoutHelper other) { if (!this.deadlineSet) { this.SetDeadline(); } if (!other.deadlineSet) { other.SetDeadline(); } if (this.deadline < other.deadline) { return this.RemainingTime(); } else { return other.RemainingTime(); } } public TimeSpan RemainingTime() { return this.RemainingTimeExpireZero(); } public TimeSpan RemainingTimeExpireZero() { if (!this.deadlineSet) { this.SetDeadline(); return this.originalTimeout; } else if (this.deadline == DateTime.MaxValue) { return TimeSpan.MaxValue; } else { TimeSpan remaining = this.deadline - DateTime.UtcNow; if (remaining <= TimeSpan.Zero) { return TimeSpan.Zero; } else { return remaining; } } } public TimeSpan RemainingTimeExpireNegative() { if (!this.deadlineSet) { this.SetDeadline(); return this.originalTimeout; } else if (this.deadline == DateTime.MaxValue) { return TimeSpan.MaxValue; } else { return this.deadline - DateTime.UtcNow; } } public TimeSpan ElapsedTime() { return this.originalTimeout - this.RemainingTimeExpireZero(); } public static TimeSpan ReserveTimeAtEnd(TimeSpan timeout) { return ReserveTimeAtEnd(timeout, DefaultBufferTime); } public static TimeSpan ReserveTimeAtEnd(TimeSpan timeout, TimeSpan bufferTime) { DiagnosticUtility.DebugAssert(bufferTime >= TimeSpan.Zero, "Negative bufferTime passed to ReserveTimeAtEnd."); if (timeout < TimeSpan.Zero) { return TimeSpan.Zero; } if (timeout >= Add(bufferTime, bufferTime)) { return Add(timeout, TimeSpan.Zero - bufferTime); } return Ticks.ToTimeSpan((Ticks.FromTimeSpan(timeout) / 2) + 1); } public static TimeSpan FromMilliseconds(int milliseconds) { if (milliseconds == Timeout.Infinite) { return TimeSpan.MaxValue; } else { return TimeSpan.FromMilliseconds(milliseconds); } } public static TimeSpan FromMilliseconds(uint milliseconds) { if (milliseconds == unchecked((uint) Timeout.Infinite)) { return TimeSpan.MaxValue; } else { return TimeSpan.FromMilliseconds(milliseconds); } } public static int ToMilliseconds(TimeSpan timeout) { if (timeout == TimeSpan.MaxValue) { return Timeout.Infinite; } else { long ticks = Ticks.FromTimeSpan(timeout); if (ticks / TimeSpan.TicksPerMillisecond > int.MaxValue) { return int.MaxValue; } return Ticks.ToMilliseconds(ticks); } } public static TimeSpan Add(TimeSpan timeout1, TimeSpan timeout2) { return Ticks.ToTimeSpan(Ticks.Add(Ticks.FromTimeSpan(timeout1), Ticks.FromTimeSpan(timeout2))); } public static DateTime Add(DateTime time, TimeSpan timeout) { if (timeout >= TimeSpan.Zero && DateTime.MaxValue - time <= timeout) { return DateTime.MaxValue; } if (timeout <= TimeSpan.Zero && DateTime.MinValue - time >= timeout) { return DateTime.MinValue; } return time + timeout; } public static DateTime Subtract(DateTime time, TimeSpan timeout) { return Add(time, TimeSpan.Zero - timeout); } public static TimeSpan Divide(TimeSpan timeout, int factor) { if (timeout == TimeSpan.MaxValue) { return TimeSpan.MaxValue; } return Ticks.ToTimeSpan((Ticks.FromTimeSpan(timeout) / factor) + 1); } public static bool WaitOne(WaitHandle waitHandle, TimeSpan timeout, bool exitSync) { if (timeout == TimeSpan.MaxValue) { waitHandle.WaitOne(); return true; } else { if (IsTooLarge(timeout)) { timeout = MaxWait; } return waitHandle.WaitOne(timeout, exitSync); } } } sealed class BackoffTimeoutHelper { readonly static int maxSkewMilliseconds = (int) (IOThreadTimer.SystemTimeResolutionTicks / TimeSpan.TicksPerMillisecond); readonly static long maxDriftTicks = IOThreadTimer.SystemTimeResolutionTicks * 2; readonly static TimeSpan defaultInitialWaitTime = TimeSpan.FromMilliseconds(1); readonly static TimeSpan defaultMaxWaitTime = TimeSpan.FromMinutes(1); DateTime deadline; TimeSpan maxWaitTime; TimeSpan waitTime; IOThreadTimer backoffTimer; WaitCallback backoffCallback; object backoffState; Random random; TimeSpan originalTimeout; internal BackoffTimeoutHelper(TimeSpan timeout) : this(timeout, BackoffTimeoutHelper.defaultMaxWaitTime) { } internal BackoffTimeoutHelper(TimeSpan timeout, TimeSpan maxWaitTime) : this(timeout, maxWaitTime, BackoffTimeoutHelper.defaultInitialWaitTime) { } internal BackoffTimeoutHelper(TimeSpan timeout, TimeSpan maxWaitTime, TimeSpan initialWaitTime) { this.random = new Random(GetHashCode()); this.maxWaitTime = maxWaitTime; this.originalTimeout = timeout; Reset(timeout, initialWaitTime); } public TimeSpan OriginalTimeout { get { return this.originalTimeout; } } void Reset(TimeSpan timeout, TimeSpan initialWaitTime) { if (timeout == TimeSpan.MaxValue) { this.deadline = DateTime.MaxValue; } else { this.deadline = DateTime.UtcNow + timeout; } this.waitTime = initialWaitTime; } public bool IsExpired() { if (this.deadline == DateTime.MaxValue) { return false; } else { return (DateTime.UtcNow >= this.deadline); } } public void WaitAndBackoff(WaitCallback callback, object state) { if (this.backoffCallback != callback || this.backoffState != state) { if (this.backoffTimer != null) { this.backoffTimer.Cancel(); } this.backoffCallback = callback; this.backoffState = state; this.backoffTimer = new IOThreadTimer(callback, state, false, BackoffTimeoutHelper.maxSkewMilliseconds); } TimeSpan backoffTime = WaitTimeWithDrift(); Backoff(); this.backoffTimer.Set(backoffTime); } public void WaitAndBackoff() { Thread.Sleep(WaitTimeWithDrift()); Backoff(); } TimeSpan WaitTimeWithDrift() { return Ticks.ToTimeSpan(Math.Max( Ticks.FromTimeSpan(BackoffTimeoutHelper.defaultInitialWaitTime), Ticks.Add(Ticks.FromTimeSpan(this.waitTime), (long) (uint) this.random.Next() % (2 * BackoffTimeoutHelper.maxDriftTicks + 1) - BackoffTimeoutHelper.maxDriftTicks))); } void Backoff() { if (waitTime.Ticks >= (maxWaitTime.Ticks / 2)) { waitTime = maxWaitTime; } else { waitTime = TimeSpan.FromTicks(waitTime.Ticks * 2); } if (this.deadline != DateTime.MaxValue) { TimeSpan remainingTime = this.deadline - DateTime.UtcNow; if (this.waitTime > remainingTime) { this.waitTime = remainingTime; if (this.waitTime < TimeSpan.Zero) { this.waitTime = TimeSpan.Zero; } } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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