void QCodeModel::q_uncache(QCodeNode *n, QByteArray cxt = QByteArray())
{
if ( isCachable(n, cxt) )
{
m_cache.remove(cxt);
//qDebug("De-Caching %s", cxt.constData());
}
foreach ( QCodeNode *child, n->children )
q_uncache(child, cxt);
}
void QCodeModel::q_cache(QCodeNode *n, QByteArray cxt = QByteArray())
{
if ( isCachable(n, cxt) )
{
m_cache.insert(cxt, n);
//qDebug("Caching %s [0x%x] in 0x%x", cxt.constData(), n, this);
}
foreach ( QCodeNode *child, n->children )
q_cache(child, cxt);
}
string DBHashCmd::hashCollection( OperationContext* opCtx, Database* db, const string& fullCollectionName, bool* fromCache ) {
scoped_ptr<scoped_lock> cachedHashedLock;
if ( isCachable( fullCollectionName ) ) {
cachedHashedLock.reset( new scoped_lock( _cachedHashedMutex ) );
string hash = _cachedHashed[fullCollectionName];
if ( hash.size() > 0 ) {
*fromCache = true;
return hash;
}
}
*fromCache = false;
Collection* collection = db->getCollection( opCtx, fullCollectionName );
if ( !collection )
return "";
IndexDescriptor* desc = collection->getIndexCatalog()->findIdIndex( opCtx );
auto_ptr<PlanExecutor> exec;
if ( desc ) {
exec.reset(InternalPlanner::indexScan(opCtx,
collection,
desc,
BSONObj(),
BSONObj(),
false,
InternalPlanner::FORWARD,
InternalPlanner::IXSCAN_FETCH));
}
else if ( collection->isCapped() ) {
exec.reset(InternalPlanner::collectionScan(opCtx,
fullCollectionName,
collection));
}
else {
log() << "can't find _id index for: " << fullCollectionName << endl;
return "no _id _index";
}
md5_state_t st;
md5_init(&st);
long long n = 0;
PlanExecutor::ExecState state;
BSONObj c;
verify(NULL != exec.get());
while (PlanExecutor::ADVANCED == (state = exec->getNext(&c, NULL))) {
md5_append( &st , (const md5_byte_t*)c.objdata() , c.objsize() );
n++;
}
if (PlanExecutor::IS_EOF != state) {
warning() << "error while hashing, db dropped? ns=" << fullCollectionName << endl;
}
md5digest d;
md5_finish(&st, d);
string hash = digestToString( d );
if ( cachedHashedLock.get() ) {
_cachedHashed[fullCollectionName] = hash;
}
return hash;
}
void DBHashCmd::wipeCacheForCollection( const StringData& ns ) {
if ( !isCachable( ns ) )
return;
scoped_lock lk( _cachedHashedMutex );
_cachedHashed.erase( ns.toString() );
}
