ContainerBase *LookupIndexFunction::getContainerArg(DynamicContext *context, bool lookup) const
{
if(container_ != 0) return container_;
if(!_args[0]->isConstant() && !lookup) return 0;
DbXmlConfiguration *conf = GET_CONFIGURATION(context);
Item::Ptr containerName = getParamNumber(1, context)->next(context);
try {
XmlContainer container = DbXmlUri::openContainer(XMLChToUTF8(containerName->asString(context)).str(),
conf->getManager(), conf->getTransaction());
Container *tcont = (Container*)container;
conf->getMinder()->addContainer(tcont);
return tcont;
}
catch(XmlException &e) {
e.setLocationInfo(this);
throw;
}
// Never reached
return 0;
}
void DbXmlUpdateFactory::applyPut(const PendingUpdate &update, DynamicContext *context)
{
DbXmlUri uri(update.getValue().first()->
asString(context), true);
if (uri.isDbXmlScheme()) {
const DbXmlNodeImpl *content =
(const DbXmlNodeImpl*)update.getTarget().get();
string cname = uri.getContainerName();
string docname = uri.getDocumentName();
DbXmlConfiguration *conf = GET_CONFIGURATION(context);
XmlManager &mgr = conf->getManager();
XmlContainer cont = ((Manager&)mgr).getOpenContainer(cname);
if (cont.isNull()) {
string msg = "Target container for fn:put -- ";
msg += cname;
msg += " -- must be open";
throw XmlException(XmlException::INVALID_VALUE,
msg);
}
OperationContext &oc = conf->getOperationContext();
XmlDocument doc = mgr.createDocument();
doc.setName(docname);
XmlEventReader *reader =
(XmlEventReader*)content->getEventReader(context);
DBXML_ASSERT(reader);
doc.setContentAsEventReader(*reader);
XmlUpdateContext uc = mgr.createUpdateContext();
// use internal interface to avoid additional transaction
int err = ((Container &)cont).addDocumentInternal(oc.txn(), doc, uc, 0);
if (err != 0)
throw XmlException(err);
}
}
// NOTE: Because removal of elements can cause text content to
// change node ownership, thereby making it impossible to locate
// the proper nodes, it's necessary to either:
// 1. always remove nodes in document order (will remove leading
// text first) or
// 2. perform deletions in 2 passes -- first non-element nodes, then
// element nodes
// As of release 2.4, (1) is true because of the way the list is created
//
void DbXmlUpdateFactory::completeUpdate(DynamicContext *context)
{
DbXmlConfiguration *conf = GET_CONFIGURATION(context);
XmlManager &mgr = conf->getManager();
OperationContext &oc = conf->getOperationContext();
for(NodeSet::iterator i = forDeletion_.begin();
i != forDeletion_.end(); ++i) {
const DbXmlNodeImpl *node = i->get();
try {
// see if the node is update-able (i.e. persistent)
if (!node->isUpdateAble())
continue;
Document *document = const_cast<Document*>(node->getDocument());
DBXML_ASSERT(document);
switch(node->getType()) {
case NodeInfo::DOCUMENT: {
#ifdef DBXML_DONT_DELETE_DOCUMENTS
throw XmlException(XmlException::QUERY_EVALUATION_ERROR,
"Cannot delete a document node [err:XUDY0020]");
#else
update_.removeDocument(*node,
*(node->getContainer()->getContainer()),
mgr, oc);
#endif
break;
}
case NodeInfo::ELEMENT: {
update_.removeElement(*node, *document, oc, context);
break;
}
case NodeInfo::ATTRIBUTE: {
update_.removeAttribute(*node, *document, oc, context);
break;
}
case NodeInfo::TEXT:
case NodeInfo::COMMENT:
case NodeInfo::PI: {
update_.removeText(*node, *document, oc, context);
break;
}
}
} catch (XmlException &xe) {
// ignore DB_NOTFOUND in this path -- nodes may
// have already been deleted via a parent tree
if ((xe.getExceptionCode() ==
XmlException::DATABASE_ERROR) &&
(xe.getDbErrno() == DB_NOTFOUND))
continue;
throw;
}
}
update_.completeUpdate(mgr, oc, context);
}
Sequence DbXmlDocAvailable::createSequence(DynamicContext* context, int flags) const
{
const XMLCh* currentUri = getUriArg(context);
DbXmlUri uri(context->getBaseURI(), currentUri, /*documentUri*/true);
if(uri.isDbXmlScheme()) {
if(uri.getDocumentName() != "") {
try {
DbXmlConfiguration *conf = GET_CONFIGURATION(context);
OperationContext &oc = conf->getOperationContext();
XmlContainer containerWrapper = uri.openContainer(conf->getManager(), oc.txn());
// Perform a presence lookup on the built-in node-metadata-equality-string
// index for the document name
AutoDelete<NodeIterator> result(((Container*)containerWrapper)->
createDocumentIterator(context, this, uri.getDocumentName().c_str(),
uri.getDocumentName().length()));
return Sequence(context->getItemFactory()->
createBoolean(result->next(context), context), context->getMemoryManager());
} catch(XmlException &) {}
}
return Sequence(context->getItemFactory()->createBoolean(false, context), context->getMemoryManager());
}
// Revert to the default behaviour
try {
Sequence seq = context->resolveDocument(currentUri, this);
if(!seq.isEmpty()) {
// Force the lazy DbXmlNodeImpl to parse the document,
// to check that it actually exists and is valid.
const Item *item = seq.first();
const DbXmlNodeImpl *impl = (const DbXmlNodeImpl*)item->getInterface(DbXmlNodeImpl::gDbXml);
DBXML_ASSERT(impl);
impl->getNsDomNode();
return Sequence(context->getItemFactory()->createBoolean(true, context), context->getMemoryManager());
}
} catch(...) {}
return Sequence(context->getItemFactory()->createBoolean(false, context), context->getMemoryManager());
}
//
// "next" is NsDomNode * because the navigational methods used
// to calculate it in callers are available via NsDom and not via
// DbXmlNodeImpl, which uses axis iterators. They could be added
// if ever deemed necessary and/or cleaner
//
void DbXmlUpdateFactory::applyInserts(
const PendingUpdate &update,
const DbXmlNodeImpl *parent,
const NsDomNode *next,
DynamicContext *context,
bool firstOrAfter)
{
DbXmlConfiguration *conf = GET_CONFIGURATION(context);
XmlManager &mgr = conf->getManager();
OperationContext &oc = conf->getOperationContext();
Document *document = const_cast<Document*>(parent->getDocument());
Result children = update.getValue();
Item::Ptr item;
while((item = children->next(context)).notNull()) {
const DbXmlNodeImpl *child = (const DbXmlNodeImpl*)item->
getInterface(DbXmlNodeImpl::gDbXml);
switch(child->getNodeType()) {
case nsNodeElement:
{
update_.insertElement(*child, *parent,
next /* next */,
mgr, *document, oc,
context, firstOrAfter);
break;
}
case nsNodeText:
case nsNodeCDATA:
case nsNodePinst:
case nsNodeComment:
{
update_.insertText(*child, *parent, next,
*document, oc, context);
break;
}
default:
throw XmlException(XmlException::INVALID_VALUE,
"Cannot insert a node that is not element or text");
}
}
}
void DocID::fetchDocument(const ContainerBase *container, DbXmlConfiguration &conf,
XmlDocument &doc, ReferenceMinder *minder) const
{
fetchDocument(container, conf.getOperationContext(),
conf.getFlags(), doc, minder);
if(container->getContainerID() == 0 && doc.isNull()) {
// Just make a new XmlDocument
XmlManager &mgr = conf.getManager();
doc = mgr.createDocument();
// get the temp DB for construction (container id 0)
CacheDatabase *cdb = conf.getDbMinder().findOrAllocate((Manager&)mgr, 0);
// Tell the document to use this database, and that it's
// content is "NsDom"
// TBD GMF: at some point, Document and NsDocument objects will not
// be required by DbXmlNodeImpl, so creation/init of Document
// objects is not required.
Document &tdoc = (Document&)doc;
tdoc.setDbMinder(conf.getDbMinder());
tdoc.setContentAsNsDom(*this, cdb);
if(minder != 0) minder->addDocument(doc);
}
// tell the document to use the shared databases in
// the DbXmlConfiguration's CacheDatabaseMinder
// If necessary, initialize the configuration's minder
// TBD GMF -- figure out how to avoid using Container * here
Container *cont = const_cast<ContainerBase*>(container)->getContainer();
if (cont != 0 && !cont->isNodeContainer()) {
Manager &mgr = (Manager&)cont->getManager();
CacheDatabaseMinder &dbminder = conf.getDbMinder();
dbminder.init(mgr);
((Document&)doc).setDbMinder(dbminder);
}
}
DecisionPointQP::ListItem *DecisionPointQP::justInTimeOptimize(int contID, DynamicContext *context)
{
// **** IMPORTANT - This algorithm is very carefully arranged to avoid
// **** deadlocks and race-conditions. Don't rearrange things unless you
// **** know what you are doing!
// Get the runtime configuration
DbXmlConfiguration *conf = GET_CONFIGURATION(context);
// Lookup the container
ScopedContainer scont((Manager&)conf->getManager(), contID, /*mustExist*/true);
// Just-in-time optimise the QueryPlan, using a temporary memory manager for thread safety
XPath2MemoryManagerImpl tmpMM;
QueryPlan *qp;
{
AutoMemoryManagerReset resetMM(context, &tmpMM);
qp = arg_->copy(&tmpMM);
try {
AutoDecisionPointReset reset(conf, this);
justInTimeOptimize(qp, scont.get(), context);
}
catch(XmlException &e) {
if(e.getQueryLine() == 0)
e.setLocationInfo(this);
throw;
}
}
// Hold the compile time mutex whilst altering the query plan.
// This protects the compile time XPath2MemoryManager as well
// as the query plan itself.
//
// (The mutex in the runtime configuration is the same as the
// one from the compile time configuration.)
MutexLock lock(conf->getMutex());
// Now we hold the lock, re-search qpList_ for the container,
// in case someone beat us to creating it.
DecisionPointQP::ListItem **li = &qpList_;
while(*li != 0 && (*li)->container->getContainerID() < contID) {
li = &(*li)->next;
}
if(*li == 0 || (*li)->container->getContainerID() != contID) {
// Add the container to the compile time ReferenceMinder, in case it has been auto-opened
if (contID > 0)
compileTimeMinder_->addContainer(scont.getContainer());
// Create a new ListItem and copy the optimised QueryPlan using the
// compile time memory manager - so that they can both become a
// permanent part of the query's AST
XPath2MemoryManager *compile_mm = compileTimeContext_->getMemoryManager();
DecisionPointQP::ListItem *newListItem = new (compile_mm) DecisionPointQP::ListItem(scont.get(), *li);
newListItem->qp = qp->copy(compile_mm);
newListItem->qp->staticTypingLite(compileTimeContext_);
// Only add the new ListItem to the linked list once it is fully optimised
// and ready to execute - otherwise another thread could come along and try
// to use it.
*li = newListItem;
}
else {
// All our work was in vain! Someone beat us to creating a QueryPlan
// for this container. Oh well, we'll just use the existing one then...
}
qp->release();
return *li;
}