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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "sourceblendersearch.h"
#include "isourceselector.h"
#include <vespa/vespalib/stllike/asciistream.h>
#include <vespa/vespalib/objects/visit.hpp>
#include <vespa/vespalib/util/array.hpp>
namespace search::queryeval {
EmptySearch SourceBlenderSearch::_emptySearch;
class SourceBlenderSearchNonStrict : public SourceBlenderSearch
{
public:
SourceBlenderSearchNonStrict(std::unique_ptr<Iterator> sourceSelector, const Children &children)
: SourceBlenderSearch(std::move(sourceSelector), children)
{}
};
class SourceBlenderSearchStrict : public SourceBlenderSearch
{
public:
SourceBlenderSearchStrict(std::unique_ptr<Iterator> sourceSelector, const Children &children);
private:
VESPA_DLL_LOCAL void advance() __attribute__((noinline));
vespalib::Array<SearchIterator *> _nextChildren;
void doSeek(uint32_t docid) override;
Trinary is_strict() const override { return Trinary::True; }
};
SourceBlenderSearchStrict::SourceBlenderSearchStrict(
std::unique_ptr<Iterator> sourceSelector,
const Children &children)
: SourceBlenderSearch(std::move(sourceSelector), children),
_nextChildren()
{
_nextChildren.reserve(children.size());
}
void
SourceBlenderSearch::doSeek(uint32_t docid)
{
if (docid >= _docIdLimit) {
setDocId(endDocId);
return;
}
_matchedChild = getSearch(_sourceSelector->getSource(docid));
if (_matchedChild->seek(docid)) {
setDocId(docid);
}
}
void
SourceBlenderSearchStrict::doSeek(uint32_t docid)
{
if (docid >= _docIdLimit) {
setDocId(endDocId);
return;
}
_matchedChild = getSearch(_sourceSelector->getSource(docid));
if (_matchedChild->seek(docid)) {
setDocId(docid);
} else {
for (auto & child : _children) {
getSearch(child)->seek(docid);
}
advance();
}
}
void
SourceBlenderSearchStrict::advance()
{
for (;;) {
SearchIterator * search = getSearch(_children[0]);
uint32_t minNextId = search->getDocId();
_nextChildren.clear();
_nextChildren.push_back_fast(search);
for (uint32_t i = 1; i < _children.size(); ++i) {
search = getSearch(_children[i]);
uint32_t nextId = search->getDocId();
if (nextId < minNextId) {
minNextId = nextId;
_nextChildren.clear();
_nextChildren.push_back_fast(search);
} else if (nextId == minNextId) {
_nextChildren.push_back_fast(search);
}
}
if (isAtEnd(minNextId)) {
setAtEnd();
return;
}
if (minNextId >= _docIdLimit) {
setAtEnd();
return;
}
search = getSearch(_sourceSelector->getSource(minNextId));
for (SearchIterator * child : _nextChildren) {
if (child == search) {
_matchedChild = search;
setDocId(minNextId);
return;
}
child->seek(minNextId + 1);
}
}
}
void
SourceBlenderSearch::doUnpack(uint32_t docid)
{
_matchedChild->doUnpack(docid);
}
SourceBlenderSearch::SourceBlenderSearch(
std::unique_ptr<sourceselector::Iterator> sourceSelector,
const Children &children) :
_matchedChild(nullptr),
_sourceSelector(std::move(sourceSelector)),
_children(),
_docIdLimit(_sourceSelector->getDocIdLimit())
{
for (size_t i(0); i < sizeof(_sources)/sizeof(_sources[0]); i++) {
_sources[i] = &_emptySearch;
}
for (auto & child : children) {
Source sid(child.sourceId);
_children.push_back(sid);
_sources[sid] = child.search;
}
}
void
SourceBlenderSearch::initRange(uint32_t beginid, uint32_t endid)
{
SearchIterator::initRange(beginid, endid);
for (auto & child : _children) {
getSearch(child)->initRange(beginid, endid);
}
}
void
SourceBlenderSearch::visitMembers(vespalib::ObjectVisitor &visitor) const
{
visit(visitor, "children", _children);
for (const auto & child : _children) {
vespalib::asciistream os;
os << "Source " << child;
visit(visitor, os.str(), *getSearch(child));
}
}
SourceBlenderSearch::~SourceBlenderSearch()
{
for (auto & child : _children) {
delete getSearch(child);
}
}
void
SourceBlenderSearch::setChild(size_t index, SearchIterator::UP child) {
assert(_sources[_children[index]] == nullptr);
_sources[_children[index]] = child.release();
}
SearchIterator::UP
SourceBlenderSearch::create(std::unique_ptr<sourceselector::Iterator> sourceSelector,
const Children &children, bool strict)
{
if (strict) {
return std::make_unique<SourceBlenderSearchStrict>(std::move(sourceSelector), children);
} else {
return std::make_unique<SourceBlenderSearchNonStrict>(std::move(sourceSelector), children);
}
}
}
void visit(vespalib::ObjectVisitor &self, const vespalib::string &name,
const search::queryeval::SourceBlenderSearch::Child &obj)
{
self.openStruct(name, "search::queryeval::SourceBlenderSearch::Child");
visit(self, "search", obj.search);
visit(self, "sourceId", obj.sourceId);
self.closeStruct();
}
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