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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "invokeserviceimpl.h"
#include <cassert>
namespace vespalib {
InvokeServiceImpl::InvokeServiceImpl(duration napTime)
: _naptime(napTime),
_now(steady_clock::now()),
_lock(),
_cond(),
_currId(0),
_closed(false),
_toInvoke(),
_thread(std::make_unique<std::thread>([this]() { runLoop(); }))
{
}
InvokeServiceImpl::~InvokeServiceImpl()
{
{
std::lock_guard guard(_lock);
assert(_toInvoke.empty());
_closed = true;
_cond.notify_all();
}
_thread->join();
}
class InvokeServiceImpl::Registration : public IDestructorCallback {
public:
Registration(InvokeServiceImpl * service, uint64_t id) noexcept
: _service(service),
_id(id)
{ }
Registration(const Registration &) = delete;
Registration & operator=(const Registration &) = delete;
~Registration() override{
_service->unregister(_id);
}
private:
InvokeServiceImpl * _service;
uint64_t _id;
};
std::unique_ptr<IDestructorCallback>
InvokeServiceImpl::registerInvoke(InvokeFunc func) {
std::lock_guard guard(_lock);
uint64_t id = _currId++;
_toInvoke.emplace_back(id, std::move(func));
_cond.notify_all();
return std::make_unique<Registration>(this, id);
}
void
InvokeServiceImpl::unregister(uint64_t id) {
std::lock_guard guard(_lock);
auto found = std::find_if(_toInvoke.begin(), _toInvoke.end(), [id](const IdAndFunc & a) {
return id == a.first;
});
assert (found != _toInvoke.end());
_toInvoke.erase(found);
_cond.notify_all();
}
void
InvokeServiceImpl::runLoop() {
std::unique_lock guard(_lock);
while ( ! _closed ) {
_now.store(steady_clock::now(), std::memory_order_relaxed);
for (auto & func: _toInvoke) {
func.second();
}
_cond.wait_for(guard, _naptime);
}
}
}
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