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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "constant_value_cache.h"
#include <cassert>
namespace vespalib {
namespace eval {
ConstantValueCache::Token::~Token()
{
std::lock_guard<std::mutex> guard(cache->lock);
if (--(entry->second.num_refs) == 0) {
cache->cached.erase(entry);
}
}
ConstantValueCache::ConstantValueCache(const ConstantValueFactory &factory)
: _factory(factory),
_cache(std::make_shared<Cache>())
{
}
ConstantValueCache::~ConstantValueCache() = default;
ConstantValue::UP
ConstantValueCache::create(const vespalib::string &path, const vespalib::string &type) const
{
Cache::Key key = std::make_pair(path, type);
std::lock_guard<std::mutex> guard(_cache->lock);
auto pos = _cache->cached.find(key);
if (pos != _cache->cached.end()) {
++(pos->second.num_refs);
return std::make_unique<Token>(_cache, pos);
} else {
auto res = _cache->cached.emplace(std::move(key), _factory.create(path, type));
assert(res.second);
return std::make_unique<Token>(_cache, res.first);
}
}
} // namespace vespalib::eval
} // namespace vespalib
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