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Find requested oplog entry starting from tail of log

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This commit is contained in:
Aaron
2009-03-18 17:24:10 -04:00
parent cd0f6ef44e
commit 6d10afbd49
9 changed files with 76 additions and 34 deletions
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18
db/queryoptimizer.cpp
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@@ -126,14 +126,28 @@ namespace mongo {
unhelpful_ = true;
}
auto_ptr< Cursor > QueryPlan::newCursor() const {
auto_ptr< Cursor > QueryPlan::newCursor( const DiskLoc &startLoc ) const {
if ( !fbs_.matchPossible() )
return auto_ptr< Cursor >( new BasicCursor( DiskLoc() ) );
if ( !index_ )
return findTableScan( fbs_.ns(), order_, 0 );
return findTableScan( fbs_.ns(), order_ );
massert( "newCursor() with start location not implemented for indexed plans", startLoc.isNull() );
//TODO This constructor should really take a const ref to the index details.
return auto_ptr< Cursor >( new BtreeCursor( *const_cast< IndexDetails* >( index_ ), startKey_, endKey_, direction_ >= 0 ? 1 : -1 ) );
}
auto_ptr< Cursor > QueryPlan::newReverseCursor() const {
if ( !fbs_.matchPossible() )
return auto_ptr< Cursor >( new BasicCursor( DiskLoc() ) );
if ( !index_ ) {
int orderSpec = order_.getIntField( "$natural" );
if ( orderSpec == INT_MIN )
orderSpec = 1;
return findTableScan( fbs_.ns(), BSON( "$natural" << -orderSpec ) );
}
massert( "newReverseCursor() not implemented for indexed plans", false );
return auto_ptr< Cursor >( 0 );
}
BSONObj QueryPlan::indexKey() const {
if ( !index_ )