234 lines
7.4 KiB
C++
234 lines
7.4 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1992.
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//
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// File: FRESHLOG.CXX
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//
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// Contents: Fresh persistent log & snapshot
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//
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// Classes: CPersFresh, CPersStream, SPersStream, CPersFreshTrans
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//
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// History: 93-Nov-15 DwightKr Created.
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//
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//----------------------------------------------------------------------------
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#include <pch.cxx>
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#pragma hdrstop
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#include <pstore.hxx>
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#include <dynstrm.hxx>
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#include <freshlog.hxx>
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#include "fresh.hxx"
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#include "partlst.hxx"
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#include "partn.hxx"
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//+---------------------------------------------------------------------------
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//
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// Member: CPersFresh::LokEmpty, public
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//
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// Synopsis: Empties the fresh log
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//
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// History: 94-Nov-15 DwightKr Created.
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//
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//----------------------------------------------------------------------------
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void CPersFresh::LokEmpty()
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{
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WORKID oidFreshLog = _storage.GetSpecialItObjectId( itFreshLog );
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PRcovStorageObj *pPersFreshLog = _storage.QueryFreshLog( oidFreshLog );
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SRcovStorageObj PersFreshLog( pPersFreshLog );
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CRcovStrmWriteTrans xact( &PersFreshLog );
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PersFreshLog->GetHeader().SetCount(PersFreshLog->GetHeader().GetBackup(), 0);
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xact.Empty();
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xact.Commit();
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CPersFresh::LoadFreshTest, private
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//
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// Synopsis: Load the persistent log into the freshTable.
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//
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// Arguments: [freshTable] -- freshTable to load from the persistent log
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//
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// History: 93-Nov-18 DwightKr Created.
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//
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//----------------------------------------------------------------------------
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void CPersFresh::LoadFreshTest(CFreshTable & freshTable)
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{
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ciDebugOut (( DEB_ITRACE, "Loading persistent log into freshTable.\n" ));
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WORKID widFreshLog = _storage.GetSpecialItObjectId( itFreshLog );
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PRcovStorageObj *pPersFreshLog = _storage.QueryFreshLog( widFreshLog );
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SRcovStorageObj PersFreshLog( pPersFreshLog );
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CRcovStrmReadTrans xact( *pPersFreshLog );
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CRcovStrmReadIter iter( xact, sizeof(CPersRec) );
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while ( !iter.AtEnd() )
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{
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CPersRec PersRec(0,0);
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iter.GetRec( &PersRec );
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#if CIDBG==1
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CIndexId iid( PersRec.GetIndexID() );
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Win4Assert( iid.IsPersistent() );
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BOOL fDeleted = iidDeleted1 == PersRec.GetIndexID() ||
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iidDeleted2 == PersRec.GetIndexID() ;
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if ( !fDeleted )
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{
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//
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// If it is not a deleted index, the index MUST be valid.
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//
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CPartition * partn = _partList.LokGetPartition( iid.PartId() );
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Win4Assert( partn->LokIsPersIndexValid( iid ) );
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}
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#endif // CIDBG==1
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freshTable.AddReplace( PersRec.GetWorkID(), PersRec.GetIndexID() );
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}
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freshTable.ModificationsComplete();
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CPersFresh::GetPersRecCount
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//
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// Synopsis: Returns the count of the number of entries in the
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// freshlog.
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//
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// Returns: Number fresh entries.
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//
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// History: 3-21-97 srikants Created
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//
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//----------------------------------------------------------------------------
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ULONG CPersFresh::GetPersRecCount()
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{
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WORKID widFreshLog = _storage.GetSpecialItObjectId( itFreshLog );
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PRcovStorageObj *pPersFreshLog = _storage.QueryFreshLog( widFreshLog );
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SRcovStorageObj PersFreshLog( pPersFreshLog );
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CRcovStorageHdr & hdr = pPersFreshLog->GetHeader();
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return hdr.GetCount( hdr.GetPrimary() );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CPersFresh::LokCompactLog, public
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//
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// Synopsis: Compacts the freshTable into a persistent stream
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//
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// Arguments: [PersFreshLog] -- persistant log to write data to
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// [iter] -- iterator to walk though freshTable table
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// [subst] -- index substitution object
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//
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// History: 93-Dec-03 DwightKr Created.
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// 94-Sep-07 SrikantS Corrected the bug by which entries
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// in the pers fresh test were lost
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// if a doc. is in wordlist.
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//
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// Notes: When we write the freshtest to disk, we must be careful not
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// to lose entries that already exist in the current persistent
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// log but have subsequently ended up in a wordlist. For example,
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// let (wid 20, iid 001) be an entry in the pers fresh test. If
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// the wid now got re-filtered and is in a wordlist iid 1001, we
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// must write (wid 20, iid 001) into the new persistent fresh
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// test. O/W, we will end up with no entry for wid 20 in the
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// fresh test upon a restart and cause "duplicate wid" problem
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// where by a wid will be present in a master index as well as
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// as a shadow index.
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//
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//----------------------------------------------------------------------------
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void CPersFresh::LokCompactLog( SRcovStorageObj & PersFreshLog,
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CFreshTableIter & freshIter,
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CIdxSubstitution& subst)
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{
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//
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// Create an in-memory copy the persistent fresh test. This will be
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// used to know the last persistent mapping for a document which
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// has subsequently been filtered and is in a wordlist.
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// 100 is the count guess for the # of entries.
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//
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XPtr<CFreshTest> xFreTestPersist( new CFreshTest( 100 ) );
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//
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// Load the entries from the persistent fresh log in the fresh hash.
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//
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LoadFreshTest( * xFreTestPersist->GetFreshTable() );
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//
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// Replace old index id's in this copy of persistent fresh test
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//
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XPtr<CFreshTest> xFreTestPersistUpdated(
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new CFreshTest( xFreTestPersist.GetReference(),
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subst ) );
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//
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// Create a brand new fresh log and append entries to it.
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//
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CRcovStrmAppendTrans xact( &PersFreshLog );
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//
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// It should be an empty object.
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//
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Win4Assert( PersFreshLog->GetHeader().GetCount(
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PersFreshLog->GetHeader().GetBackup() ) == 0 );
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CRcovStrmAppendIter appendIter( xact, sizeof(CPersRec) );
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//
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// freshIter points to the first entry in the freshTable. If the
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// freshTable is empty, then we don't need to process anything more
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// here, as we have an empty stream, which reflects an empty freshTable.
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//
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for ( ; !freshIter.AtEnd(); freshIter.Advance() )
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{
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INDEXID iidCurr = freshIter->IndexId();
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Win4Assert( iidInvalid != iidCurr );
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CIndexId IndexID( iidCurr );
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WORKID wid = freshIter->WorkId();
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//
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// If there is a wordlist which contains the information for this
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// wid, then we should use any persistent association found in the
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// persistent fresh test for this wid.
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//
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if ( !IndexID.IsPersistent() )
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{
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iidCurr = xFreTestPersistUpdated->Find( wid );
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}
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if ( iidInvalid != iidCurr )
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{
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#if CIDBG==1
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CIndexId iidVerify( iidCurr );
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Win4Assert( iidVerify.IsPersistent() );
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#endif // CIDBG
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CPersRec PersRec( wid, iidCurr );
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appendIter.AppendRec( &PersRec );
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}
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}
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xact.Commit();
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}
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