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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "document_inverter_collection.h"
#include "document_inverter.h"
#include <cassert>
namespace search::memoryindex {
DocumentInverterCollection::DocumentInverterCollection(DocumentInverterContext& context, uint32_t max_inverters)
: _context(context),
_free_inverters(),
_inflight_inverters(),
_active_inverter(std::make_unique<DocumentInverter>(_context)),
_num_inverters(1),
_max_inverters(max_inverters)
{
}
DocumentInverterCollection::~DocumentInverterCollection() = default;
void
DocumentInverterCollection::switch_active_inverter()
{
_inflight_inverters.emplace_back(std::move(_active_inverter));
while (!_inflight_inverters.empty() && _inflight_inverters.front()->has_zero_ref_count()) {
_free_inverters.emplace_back(std::move(_inflight_inverters.front()));
_inflight_inverters.pop_front();
}
if (!_free_inverters.empty()) {
_active_inverter = std::move(_free_inverters.back());
_free_inverters.pop_back();
return;
}
if (_num_inverters >= _max_inverters) {
assert(!_inflight_inverters.empty());
_active_inverter = std::move(_inflight_inverters.front());
_inflight_inverters.pop_front();
_active_inverter->wait_for_zero_ref_count();
return;
}
_active_inverter = std::make_unique<DocumentInverter>(_context);
++_num_inverters;
}
}
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