本文整理汇总了C++中NamespaceDetails::lastExtent方法的典型用法代码示例。如果您正苦于以下问题：C++ NamespaceDetails::lastExtent方法的具体用法？C++ NamespaceDetails::lastExtent怎么用？C++ NamespaceDetails::lastExtent使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类NamespaceDetails的用法示例。
在下文中一共展示了NamespaceDetails::lastExtent方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: findAll
/* get a table scan cursor, but can be forward or reverse direction.
order.$natural - if set, > 0 means forward (asc), < 0 backward (desc).
*/
shared_ptr<Cursor> findTableScan(const char *ns, const BSONObj& order, const DiskLoc &startLoc) {
BSONElement el = order.getField("$natural"); // e.g., { $natural : -1 }
if ( el.number() >= 0 )
return DataFileMgr::findAll(ns, startLoc);
// "reverse natural order"
NamespaceDetails *d = nsdetails(ns);
if ( !d )
return shared_ptr<Cursor>(new BasicCursor(DiskLoc()));
if ( !d->isCapped() ) {
if ( !startLoc.isNull() )
return shared_ptr<Cursor>(new ReverseCursor( startLoc ));
Extent *e = d->lastExtent().ext();
while ( e->lastRecord.isNull() && !e->xprev.isNull() ) {
OCCASIONALLY out() << " findTableScan: extent empty, skipping ahead" << endl;
e = e->getPrevExtent();
}
return shared_ptr<Cursor>(new ReverseCursor( e->lastRecord ));
}
else {
return shared_ptr<Cursor>( new ReverseCappedCursor( d, startLoc ) );
}
}示例2: validateDBName
Database::Database(TransactionExperiment* txn, const char *nm, bool& newDb, const string& path )
: _name(nm), _path(path),
_namespaceIndex( _path, _name ),
_extentManager(new MmapV1ExtentManager(_name, _path, storageGlobalParams.directoryperdb)),
_profileName(_name + ".system.profile"),
_namespacesName(_name + ".system.namespaces"),
_indexesName(_name + ".system.indexes"),
_collectionLock( "Database::_collectionLock" )
{
Status status = validateDBName( _name );
if ( !status.isOK() ) {
warning() << "tried to open invalid db: " << _name << endl;
uasserted( 10028, status.toString() );
}
try {
newDb = _namespaceIndex.exists();
_profile = serverGlobalParams.defaultProfile;
checkDuplicateUncasedNames(true);
// If already exists, open. Otherwise behave as if empty until
// there's a write, then open.
if (!newDb) {
_namespaceIndex.init( txn );
openAllFiles(txn);
// upgrade freelist
string oldFreeList = _name + ".$freelist";
NamespaceDetails* details = _namespaceIndex.details( oldFreeList );
if ( details ) {
if ( !details->firstExtent().isNull() ) {
_extentManager->freeExtents(txn,
details->firstExtent(),
details->lastExtent());
}
_namespaceIndex.kill_ns( txn, oldFreeList );
}
}
_magic = 781231;
}
catch(std::exception& e) {
log() << "warning database " << path << " " << nm << " could not be opened" << endl;
DBException* dbe = dynamic_cast<DBException*>(&e);
if ( dbe != 0 ) {
log() << "DBException " << dbe->getCode() << ": " << e.what() << endl;
}
else {
log() << e.what() << endl;
}
_extentManager.reset();
throw;
}
}示例3: validateNS
void validateNS(const string& ns,
Collection* collection,
const BSONObj& cmdObj,
BSONObjBuilder& result) {
const bool full = cmdObj["full"].trueValue();
const bool scanData = full || cmdObj["scandata"].trueValue();
NamespaceDetails* nsd = collection->details();
bool valid = true;
BSONArrayBuilder errors; // explanation(s) for why valid = false
if ( collection->isCapped() ){
result.append("capped", nsd->isCapped());
result.appendNumber("max", nsd->maxCappedDocs());
}
if ( nsd->firstExtent().isNull() )
result.append( "firstExtent", "null" );
else
result.append( "firstExtent", str::stream() << nsd->firstExtent().toString()
<< " ns:" << nsd->firstExtent().ext()->nsDiagnostic.toString());
if ( nsd->lastExtent().isNull() )
result.append( "lastExtent", "null" );
else
result.append( "lastExtent", str::stream() << nsd->lastExtent().toString()
<< " ns:" << nsd->lastExtent().ext()->nsDiagnostic.toString());
BSONArrayBuilder extentData;
int extentCount = 0;
try {
if ( !nsd->firstExtent().isNull() ) {
nsd->firstExtent().ext()->assertOk();
nsd->lastExtent().ext()->assertOk();
}
DiskLoc extentDiskLoc = nsd->firstExtent();
while (!extentDiskLoc.isNull()) {
Extent* thisExtent = extentDiskLoc.ext();
if (full) {
extentData << thisExtent->dump();
}
if (!thisExtent->validates(extentDiskLoc, &errors)) {
valid = false;
}
DiskLoc nextDiskLoc = thisExtent->xnext;
if (extentCount > 0 && !nextDiskLoc.isNull()
&& nextDiskLoc.ext()->xprev != extentDiskLoc) {
StringBuilder sb;
sb << "'xprev' pointer " << nextDiskLoc.ext()->xprev.toString()
<< " in extent " << nextDiskLoc.toString()
<< " does not point to extent " << extentDiskLoc.toString();
errors << sb.str();
valid = false;
}
if (nextDiskLoc.isNull() && extentDiskLoc != nsd->lastExtent()) {
StringBuilder sb;
sb << "'lastExtent' pointer " << nsd->lastExtent().toString()
<< " does not point to last extent in list " << extentDiskLoc.toString();
errors << sb.str();
valid = false;
}
extentDiskLoc = nextDiskLoc;
extentCount++;
killCurrentOp.checkForInterrupt();
}
}
catch (const DBException& e) {
StringBuilder sb;
sb << "exception validating extent " << extentCount
<< ": " << e.what();
errors << sb.str();
valid = false;
}
result.append("extentCount", extentCount);
if ( full )
result.appendArray( "extents" , extentData.arr() );
result.appendNumber("datasize", nsd->dataSize());
result.appendNumber("nrecords", nsd->numRecords());
result.appendNumber("lastExtentSize", nsd->lastExtentSize());
result.appendNumber("padding", nsd->paddingFactor());
try {
bool testingLastExtent = false;
try {
if (nsd->firstExtent().isNull()) {
// this is ok
}
else {
result.append("firstExtentDetails", nsd->firstExtent().ext()->dump());
if (!nsd->firstExtent().ext()->xprev.isNull()) {
StringBuilder sb;
sb << "'xprev' pointer in 'firstExtent' " << nsd->firstExtent().toString()
<< " is " << nsd->firstExtent().ext()->xprev.toString()
<< ", should be null";
errors << sb.str();
//.........这里部分代码省略.........