Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / Log / System / IO / Log / SimpleFileLog.cs / 1305376 / SimpleFileLog.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace System.IO.Log { using System; using System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; internal class SimpleFileLog { SmuggledIUnknown smuggledLog; internal SimpleFileLog(string absolutePath, int size) { // Open the log. // First, we try to open an existing log-- if that doesn't // work, we create a new one. // bool loaded = false; ILog log = (ILog)new SimpleFileBasedLog(); try { if (File.Exists(absolutePath)) { try { IPersistFile ipf = (IPersistFile)log; ipf.Load(absolutePath, (int)STGM.ReadWrite); loaded = true; } catch (FileNotFoundException) { // File not found, create a new one. } } if (!loaded) { // File does not exist. Attempt to create a new one, // with the specified size. // IFileBasedLogInit logInit = (IFileBasedLogInit)log; logInit.InitNew(absolutePath, size); } log.SetAccessPolicyHint(RECORD_READING_POLICY.RANDOM); this.smuggledLog = new SmuggledIUnknown(log); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } catch(FileNotFoundException) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.Argument_FileNameInvalid))); } finally { SafeRelease(log); } } static void SafeRelease(object obj) { if (obj != null) { Marshal.FinalReleaseComObject(obj); } } internal void Close() { if(!this.smuggledLog.IsInvalid) { ILog log = (ILog)(this.smuggledLog.Smuggle()); try { this.smuggledLog.Close(); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { SafeRelease(log); } } } internal void TruncatePrefix(SequenceNumber seqNumber) { if(this.smuggledLog.IsInvalid) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); } ILog log = (ILog)(this.smuggledLog.Smuggle()); try { log.TruncatePrefix(seqNumber.High); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { SafeRelease(log); } } internal void Force(SequenceNumber seqNumber) { if(this.smuggledLog.IsInvalid) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); } ILog log = (ILog)(this.smuggledLog.Smuggle()); try { log.Force(seqNumber.High); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { SafeRelease(log); } } internal void GetLogLimits(out SequenceNumber first, out SequenceNumber last) { ulong lsnfirst = 0; ulong lsnlast = 0; if(this.smuggledLog.IsInvalid) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); } ILog log = (ILog)(this.smuggledLog.Smuggle()); try { log.GetLogLimits(out lsnfirst, out lsnlast); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { SafeRelease(log); } first = new SequenceNumber(lsnfirst); last = new SequenceNumber(lsnlast); } internal SequenceNumber AppendRecord(UnmanagedBlob[] data, bool fForceNow) { ulong recordLsn = 0; if(this.smuggledLog.IsInvalid) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); } ILog log = (ILog)(this.smuggledLog.Smuggle()); try { // Due to WinSE 184096 bug, we always do force flush as a work around. Ignoring fForceNow value... // If force flush is not done, the user will be able to read stale records after calling TruncatePrefix and // the base lsn will not be updated to reflect the new lsn in TruncatePrefix call. // This is a temporary work around fix and if txflog issue is fixed at a later date, we need to have a QFE // to use the user passed in fForceNow flag value to support buffering of log records. // Related Bugs: // WinSE: 184096 // Windows OS: 1729140 // MB: 57586 52216 log.AppendRecord(data, data.Length, true, out recordLsn); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { SafeRelease(log); } return new SequenceNumber(recordLsn); } internal void ReadRecord(SequenceNumber seqNumtoRead, out byte[] record, out int recordSize, out SequenceNumber previous, out SequenceNumber next) { ulong prevLsn = 0; ulong nextLsn = 0; record = null; recordSize = 0; if(this.smuggledLog.IsInvalid) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); } ILog log = (ILog)(this.smuggledLog.Smuggle()); try { CoTaskMemHandle pData = null; try { log.ReadRecord(seqNumtoRead.High, out prevLsn, out nextLsn, out pData, out recordSize); record = new byte[recordSize]; Marshal.Copy(pData.DangerousGetHandle(), record, 0, recordSize); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { if (pData != null && !pData.IsInvalid) pData.Close(); } } finally { SafeRelease(log); } previous = new SequenceNumber(prevLsn); next = new SequenceNumber(nextLsn); } internal void ReadRecordPrefix(SequenceNumber seqNumtoRead, out byte[] record, ref int cbData, out int recordSize, out SequenceNumber previous, out SequenceNumber next) { ulong prevLsn = 0; ulong nextLsn = 0; record = null; recordSize = 0; if(this.smuggledLog.IsInvalid) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed()); } ILog log = (ILog)(this.smuggledLog.Smuggle()); try { record = new byte[cbData]; log.ReadRecordPrefix(seqNumtoRead.High, out prevLsn, out nextLsn, record, ref cbData, out recordSize); } catch (COMException exception) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ConvertKnownException(exception)); } finally { SafeRelease(log); } previous = new SequenceNumber(prevLsn); next = new SequenceNumber(nextLsn); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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