Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Log / System / IO / Log / FileLogRecordEnumerator.cs / 1305376 / FileLogRecordEnumerator.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.IO.Log { using System; using System.Collections; using System.Collections.Generic; internal class FileLogRecordEnumerable : IEnumerable{ LogRecordEnumeratorType logRecordEnum; SimpleFileLog log; SequenceNumber start; bool enumRestartAreas; internal FileLogRecordEnumerable( SimpleFileLog log, SequenceNumber start, LogRecordEnumeratorType logRecordEnum, bool enumRestartAreas) { this.log = log; this.start = start; this.logRecordEnum = logRecordEnum; this.enumRestartAreas = enumRestartAreas; } IEnumerator IEnumerable.GetEnumerator() { return this.GetEnumerator(); } public IEnumerator GetEnumerator() { return new FileLogRecordEnumerator( log, start, logRecordEnum, enumRestartAreas); } } internal class FileLogRecordEnumerator : IEnumerator { FileLogRecordStream stream = null; FileLogRecord record = null; bool enumStarted = false; SequenceNumber start; SequenceNumber current; LogRecordEnumeratorType logRecordEnum; SimpleFileLog log; bool disposed = false; bool enumRestartAreas; internal FileLogRecordEnumerator( SimpleFileLog log, SequenceNumber start, LogRecordEnumeratorType logRecordEnum, bool enumRestartAreas) { this.log = log; this.start = start; this.current = start; this.logRecordEnum = logRecordEnum; this.enumRestartAreas = enumRestartAreas; } object IEnumerator.Current { get { return this.Current; } } public LogRecord Current { get { if (this.disposed) #pragma warning suppress 56503 throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); // IEnumerable interface contract for "current" member can throw InvalidOperationException. Suppressing this warning. if (!this.enumStarted) #pragma warning suppress 56503 throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.EnumNotStarted()); if (this.record == null) #pragma warning suppress 56503 throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.EnumEnded()); return this.record; } } public bool MoveNext() { if (this.disposed) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); if (this.current == SequenceNumber.Invalid) return false; if (!this.enumStarted) { this.enumStarted = true; } else { switch (this.logRecordEnum) { case LogRecordEnumeratorType.Next: this.current = this.stream.NextLsn; break; case LogRecordEnumeratorType.Previous: this.current = this.stream.Header.PreviousLsn; break; case LogRecordEnumeratorType.User: this.current = this.stream.Header.NextUndoLsn; break; } } SequenceNumber first; SequenceNumber last; log.GetLogLimits(out first, out last); if (this.current < first || last < this.current || this.current == SequenceNumber.Invalid) { this.record = null; return false; } this.stream = new FileLogRecordStream(this.log, this.current); if (!this.enumRestartAreas && this.stream.Header.IsRestartArea) { if (this.logRecordEnum == LogRecordEnumeratorType.Next) { // Move to the next record after restart area. return MoveNext(); } else { // We have hit a restart area. // Restart areas have special values for prev and next undo in the header. // Cannot enumerate further. this.record = null; return false; } } this.record = new FileLogRecord(this.stream); return true; } public void Reset() { if (this.disposed) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); this.enumStarted = false; this.current = this.start; this.record = null; } public void Dispose() { this.disposed = true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.IO.Log { using System; using System.Collections; using System.Collections.Generic; internal class FileLogRecordEnumerable : IEnumerable { LogRecordEnumeratorType logRecordEnum; SimpleFileLog log; SequenceNumber start; bool enumRestartAreas; internal FileLogRecordEnumerable( SimpleFileLog log, SequenceNumber start, LogRecordEnumeratorType logRecordEnum, bool enumRestartAreas) { this.log = log; this.start = start; this.logRecordEnum = logRecordEnum; this.enumRestartAreas = enumRestartAreas; } IEnumerator IEnumerable.GetEnumerator() { return this.GetEnumerator(); } public IEnumerator GetEnumerator() { return new FileLogRecordEnumerator( log, start, logRecordEnum, enumRestartAreas); } } internal class FileLogRecordEnumerator : IEnumerator { FileLogRecordStream stream = null; FileLogRecord record = null; bool enumStarted = false; SequenceNumber start; SequenceNumber current; LogRecordEnumeratorType logRecordEnum; SimpleFileLog log; bool disposed = false; bool enumRestartAreas; internal FileLogRecordEnumerator( SimpleFileLog log, SequenceNumber start, LogRecordEnumeratorType logRecordEnum, bool enumRestartAreas) { this.log = log; this.start = start; this.current = start; this.logRecordEnum = logRecordEnum; this.enumRestartAreas = enumRestartAreas; } object IEnumerator.Current { get { return this.Current; } } public LogRecord Current { get { if (this.disposed) #pragma warning suppress 56503 throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); // IEnumerable interface contract for "current" member can throw InvalidOperationException. Suppressing this warning. if (!this.enumStarted) #pragma warning suppress 56503 throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.EnumNotStarted()); if (this.record == null) #pragma warning suppress 56503 throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.EnumEnded()); return this.record; } } public bool MoveNext() { if (this.disposed) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); if (this.current == SequenceNumber.Invalid) return false; if (!this.enumStarted) { this.enumStarted = true; } else { switch (this.logRecordEnum) { case LogRecordEnumeratorType.Next: this.current = this.stream.NextLsn; break; case LogRecordEnumeratorType.Previous: this.current = this.stream.Header.PreviousLsn; break; case LogRecordEnumeratorType.User: this.current = this.stream.Header.NextUndoLsn; break; } } SequenceNumber first; SequenceNumber last; log.GetLogLimits(out first, out last); if (this.current < first || last < this.current || this.current == SequenceNumber.Invalid) { this.record = null; return false; } this.stream = new FileLogRecordStream(this.log, this.current); if (!this.enumRestartAreas && this.stream.Header.IsRestartArea) { if (this.logRecordEnum == LogRecordEnumeratorType.Next) { // Move to the next record after restart area. return MoveNext(); } else { // We have hit a restart area. // Restart areas have special values for prev and next undo in the header. // Cannot enumerate further. this.record = null; return false; } } this.record = new FileLogRecord(this.stream); return true; } public void Reset() { if (this.disposed) throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); this.enumStarted = false; this.current = this.start; this.record = null; } public void Dispose() { this.disposed = true; } } } // 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
- SelectedDatesCollection.cs
- TableFieldsEditor.cs
- ChangesetResponse.cs
- SystemNetHelpers.cs
- PathTooLongException.cs
- GradientStop.cs
- BamlRecordReader.cs
- CodeConditionStatement.cs
- PolicyLevel.cs
- DataGridViewCellEventArgs.cs
- GotoExpression.cs
- FontStretches.cs
- UInt16Converter.cs
- BitVec.cs
- Missing.cs
- WebPartMenuStyle.cs
- DSASignatureDeformatter.cs
- OrderByQueryOptionExpression.cs
- AttributeQuery.cs
- ProtectedConfiguration.cs
- TypeDependencyAttribute.cs
- UpDownBase.cs
- StatusBar.cs
- ItemContainerPattern.cs
- ComPlusTypeValidator.cs
- OletxVolatileEnlistment.cs
- XmlRawWriter.cs
- Form.cs
- AssociatedControlConverter.cs
- srgsitem.cs
- PathGradientBrush.cs
- KnownBoxes.cs
- SynchronizingStream.cs
- TrustManager.cs
- DrawingVisualDrawingContext.cs
- CompressEmulationStream.cs
- Errors.cs
- FilterQueryOptionExpression.cs
- CompressionTracing.cs
- GenericPrincipal.cs
- Certificate.cs
- ExtractedStateEntry.cs
- WebPartZone.cs
- MemoryRecordBuffer.cs
- HiddenField.cs
- _SpnDictionary.cs
- XmlSchemaAnyAttribute.cs
- StatusBarPanel.cs
- ProvideValueServiceProvider.cs
- XmlnsCache.cs
- cookiecontainer.cs
- AssemblyResolver.cs
- CalendarDateRangeChangingEventArgs.cs
- CodeNamespaceImportCollection.cs
- SystemEvents.cs
- SimpleWebHandlerParser.cs
- _Events.cs
- AutomationEventArgs.cs
- PersonalizationStateInfoCollection.cs
- SqlCachedBuffer.cs
- RestHandler.cs
- SemaphoreSlim.cs
- DesignerVerbCollection.cs
- DataSourceCacheDurationConverter.cs
- Bezier.cs
- XmlDataDocument.cs
- TagMapInfo.cs
- DrawingAttributes.cs
- FileFormatException.cs
- DesignerSerializerAttribute.cs
- NGCPageContentSerializerAsync.cs
- ConnectionString.cs
- Tokenizer.cs
- BindingContext.cs
- HyperlinkAutomationPeer.cs
- URLAttribute.cs
- SaveFileDialogDesigner.cs
- WS2007HttpBindingCollectionElement.cs
- MailMessageEventArgs.cs
- _BufferOffsetSize.cs
- XmlSchemaAppInfo.cs
- RelatedImageListAttribute.cs
- CmsUtils.cs
- StringStorage.cs
- MethodBuilder.cs
- DataControlPagerLinkButton.cs
- RenderCapability.cs
- UnsafeNativeMethods.cs
- WindowsEditBox.cs
- LinkConverter.cs
- ParseNumbers.cs
- GeneralTransformCollection.cs
- DbConnectionInternal.cs
- NetCodeGroup.cs
- InputScopeConverter.cs
- FixedDocumentPaginator.cs
- BrushMappingModeValidation.cs
- FormClosedEvent.cs
- RadioButtonFlatAdapter.cs
- ModelMemberCollection.cs