Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / ProviderBase / TimeoutTimer.cs / 1305376 / TimeoutTimer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Class used to manage timeouts in complex system operations. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Data.Common; using System.Diagnostics; // Purpose: // Manages determining and tracking timeouts // // Intended use: // Call StartXXXXTimeout() to get a timer with the given expiration point // Get remaining time in appropriate format to pass to subsystem timeouts // Check for timeout via IsExpired for checks in managed code. // Simply abandon to GC when done. internal class TimeoutTimer { //------------------- // Fields //------------------- private long _timerExpire; private bool _isInfiniteTimeout; //------------------- // Timeout-setting methods //------------------- // Get a new timer that will expire in the given number of seconds // For input, a value of zero seconds indicates infinite timeout internal static TimeoutTimer StartSecondsTimeout(int seconds) { //-------------------- // Preconditions: None (seconds must conform to SetTimeoutSeconds requirements) //-------------------- // Method body var timeout = new TimeoutTimer(); timeout.SetTimeoutSeconds(seconds); //--------------------- // Postconditions Debug.Assert(timeout != null); // Need a valid timeouttimer if no error return timeout; } #if !ORACLE // Get a new timer that will expire in the given number of milliseconds // No current need to support infinite milliseconds timeout internal static TimeoutTimer StartMillisecondsTimeout(long milliseconds) { //-------------------- // Preconditions Debug.Assert(0 <= milliseconds); //-------------------- // Method body var timeout = new TimeoutTimer(); timeout._timerExpire = checked(ADP.TimerCurrent() + (milliseconds * TimeSpan.TicksPerMillisecond)); timeout._isInfiniteTimeout = false; //--------------------- // Postconditions Debug.Assert(timeout != null); // Need a valid timeouttimer if no error return timeout; } #endif //------------------- // Methods for changing timeout //------------------- internal void SetTimeoutSeconds(int seconds) { //-------------------- // Preconditions Debug.Assert(0 <= seconds || InfiniteTimeout == seconds); // no need to support negative seconds at present //-------------------- // Method body if (InfiniteTimeout == seconds) { _isInfiniteTimeout = true; } else { // Stash current time + timeout _timerExpire = checked(ADP.TimerCurrent() + ADP.TimerFromSeconds(seconds)); _isInfiniteTimeout = false; } //--------------------- // Postconditions:None } //------------------- // Timeout info properties //------------------- // Indicator for infinite timeout when starting a timer internal static readonly long InfiniteTimeout = 0; // Is this timer in an expired state? internal bool IsExpired { get { return !IsInfinite && ADP.TimerHasExpired(_timerExpire); } } // is this an infinite-timeout timer? internal bool IsInfinite { get { return _isInfiniteTimeout; } } // Special accessor for TimerExpire for use when thunking to legacy timeout methods. internal long LegacyTimerExpire { get { return (_isInfiniteTimeout) ? Int64.MaxValue : _timerExpire; } } // Returns milliseconds remaining trimmed to zero for none remaining // and long.MaxValue for infinite // This method should be prefered for internal calculations that are not // yet common enough to code into the TimeoutTimer class itself. internal long MillisecondsRemaining { get { //------------------- // Preconditions: None //------------------- // Method Body long milliseconds; if (_isInfiniteTimeout) { milliseconds = long.MaxValue; } else { milliseconds = ADP.TimerRemainingMilliseconds(_timerExpire); if (0 > milliseconds) { milliseconds = 0; } } //-------------------- // Postconditions Debug.Assert(0<=milliseconds); // This property guarantees no negative return values return milliseconds; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- OleDbParameterCollection.cs
- XmlException.cs
- SettingsProviderCollection.cs
- ConfigurationManagerHelperFactory.cs
- AppDomainUnloadedException.cs
- ProcessProtocolHandler.cs
- DataGridViewTextBoxCell.cs
- ProfileEventArgs.cs
- DoubleUtil.cs
- NavigationEventArgs.cs
- SecureUICommand.cs
- XmlObjectSerializerContext.cs
- TypeBrowserDialog.cs
- SqlXmlStorage.cs
- OdbcError.cs
- oledbconnectionstring.cs
- UserControlBuildProvider.cs
- WebEventCodes.cs
- ViewGenResults.cs
- InputBuffer.cs
- Label.cs
- Boolean.cs
- ListViewCancelEventArgs.cs
- Bits.cs
- RecognizedPhrase.cs
- NameSpaceExtractor.cs
- ExpressionVisitor.cs
- StrokeIntersection.cs
- FileChangesMonitor.cs
- SchemaAttDef.cs
- PackagingUtilities.cs
- FamilyTypefaceCollection.cs
- SafeNativeMethods.cs
- MultipleViewPattern.cs
- UrlRoutingModule.cs
- Automation.cs
- ItemAutomationPeer.cs
- Matrix3DValueSerializer.cs
- ValidatingCollection.cs
- MessagingDescriptionAttribute.cs
- PeerPresenceInfo.cs
- DataStreams.cs
- UriScheme.cs
- NameValuePair.cs
- CipherData.cs
- PerformanceCounterScope.cs
- KeyValueSerializer.cs
- TextRangeAdaptor.cs
- OneToOneMappingSerializer.cs
- ContentValidator.cs
- WsatStrings.cs
- GacUtil.cs
- CodeTypeParameterCollection.cs
- _FtpDataStream.cs
- OledbConnectionStringbuilder.cs
- Empty.cs
- HashAlgorithm.cs
- XmlValueConverter.cs
- CodeDelegateInvokeExpression.cs
- dataobject.cs
- GPRECTF.cs
- CursorEditor.cs
- AudioSignalProblemOccurredEventArgs.cs
- ReflectionPermission.cs
- HuffmanTree.cs
- FrameAutomationPeer.cs
- basevalidator.cs
- _HeaderInfoTable.cs
- SolidBrush.cs
- listitem.cs
- XPathParser.cs
- LeafCellTreeNode.cs
- GenericPrincipal.cs
- UserValidatedEventArgs.cs
- SafeMILHandle.cs
- TemplateLookupAction.cs
- ViewCellSlot.cs
- ModuleBuilderData.cs
- IRCollection.cs
- MatrixTransform3D.cs
- WebWorkflowRole.cs
- WebZone.cs
- VerbConverter.cs
- ServicesUtilities.cs
- SmiContext.cs
- DictionaryEntry.cs
- StylusLogic.cs
- XPathAncestorQuery.cs
- SynchronizationFilter.cs
- ItemsPanelTemplate.cs
- DuplicateWaitObjectException.cs
- FtpCachePolicyElement.cs
- RepeatBehaviorConverter.cs
- DbRetry.cs
- RenameRuleObjectDialog.cs
- TransformerInfoCollection.cs
- XmlAtomicValue.cs
- Section.cs
- TextProperties.cs
- PropertyChangingEventArgs.cs