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#ifndef ADHOCUTIL_RESOURCEPOOL_IMPL_H
#define ADHOCUTIL_RESOURCEPOOL_IMPL_H
#include "lockHelpers.h"
#include "resourcePool.h" // IWYU pragma: export
#include "safeMapFind.h"
#ifdef __cpp_lib_semaphore
# include <semaphore>
#else
# include "polyfill-semaphore.h"
#endif
#include <boost/assert.hpp>
#include <cstddef>
#include <exception>
#include <memory>
#include <thread>
#include <typeinfo>
namespace AdHoc {
//
// ResourceHandle
//
template<typename R> ResourceHandle<R>::ResourceHandle(std::shared_ptr<Object> o) noexcept : resource(std::move(o))
{
}
template<typename R> ResourceHandle<R>::~ResourceHandle() noexcept
{
if (resource) {
decRef();
}
}
template<typename R>
std::size_t
ResourceHandle<R>::handleCount() const
{
BOOST_ASSERT(resource);
// InUse has one, we don't count that
return static_cast<std::size_t>(resource.use_count() - 1);
}
template<typename R>
R *
ResourceHandle<R>::get() const noexcept
{
BOOST_ASSERT(resource);
return std::get<0>(*resource).get();
}
template<typename R>
void
ResourceHandle<R>::release() noexcept
{
decRef();
}
template<typename R> ResourceHandle<R>::operator bool() const noexcept
{
return resource.operator bool();
}
template<typename R>
R *
ResourceHandle<R>::operator->() const noexcept
{
BOOST_ASSERT(resource);
return std::get<0>(*resource).get();
}
template<typename R>
ResourceHandle<R> &
ResourceHandle<R>::operator=(const ResourceHandle & rh) noexcept
{
if (&rh != this) {
if (resource) {
decRef();
}
resource = rh.resource;
}
return *this;
}
template<typename R>
ResourceHandle<R> &
ResourceHandle<R>::operator=(ResourceHandle && rh) noexcept
{
if (&rh != this) {
if (resource) {
decRef();
}
resource = std::move(rh.resource);
}
return *this;
}
template<typename R>
void
ResourceHandle<R>::decRef() noexcept
{
BOOST_ASSERT(resource);
// InUse has one, we don't count that
if (resource.use_count() == 2) {
if (auto pool = std::get<1>(*resource)) {
if (std::uncaught_exceptions()) {
pool->discard(std::get<0>(*resource));
}
else {
pool->putBack(std::get<0>(*resource));
}
}
}
resource.reset();
}
//
// ResourcePool
//
template<typename R> ResourcePool<R>::ResourcePool(std::ptrdiff_t max, std::size_t k) : poolSize(max), keep(k) { }
template<typename R> ResourcePool<R>::~ResourcePool()
{
for (auto & r : inUse) {
std::get<1>(*r.second) = nullptr;
}
}
template<typename R>
void
ResourcePool<R>::testResource(R const *) const
{
}
template<typename R>
void
ResourcePool<R>::returnTestResource(R const *) const
{
}
template<typename R>
std::size_t
ResourcePool<R>::inUseCount() const
{
SharedLock(lock);
return inUse.size();
}
template<typename R>
std::size_t
ResourcePool<R>::availableCount() const
{
SharedLock(lock);
return available.size();
}
#ifndef __cpp_lib_semaphore
template<typename R>
std::ptrdiff_t
ResourcePool<R>::freeCount() const
{
SharedLock(lock);
return poolSize.freeCount();
}
#endif
template<typename R>
ResourceHandle<R>
ResourcePool<R>::getMine()
{
Lock(lock);
return ResourceHandle(safeMapLookup<NoCurrentResourceT<R>>(inUse, std::this_thread::get_id()));
}
template<typename R>
void
ResourcePool<R>::idle()
{
Lock(lock);
available.clear();
}
template<typename R>
ResourceHandle<R>
ResourcePool<R>::get()
{
poolSize.acquire();
try {
return ResourceHandle(getOne());
}
catch (...) {
poolSize.release();
throw;
}
}
template<typename R>
ResourceHandle<R>
ResourcePool<R>::get(const std::chrono::milliseconds timeout)
{
if (!poolSize.try_acquire_for(timeout)) {
throw TimeOutOnResourcePoolT<R>();
}
try {
return getOne();
}
catch (...) {
poolSize.release();
throw;
}
}
template<typename R>
ResourceHandle<R>
ResourcePool<R>::get(unsigned int ms)
{
return get(std::chrono::milliseconds(ms));
}
template<typename R>
ResourceHandle<R>
ResourcePool<R>::getOne()
{
Lock(lock);
while (!available.empty()) {
auto & r = available.front();
try {
testResource(r.get());
auto ro = std::make_shared<typename ResourceHandle<R>::Object>(r, this);
available.pop_front();
inUse.insert({std::this_thread::get_id(), ro});
return ResourceHandle(ro);
}
catch (...) {
available.pop_front();
}
}
auto ro = std::make_shared<typename ResourceHandle<R>::Object>(createResource(), this);
inUse.insert({std::this_thread::get_id(), ro});
return ResourceHandle(ro);
}
template<typename R>
void
ResourcePool<R>::putBack(const std::shared_ptr<R> & r)
{
Lock(lock);
removeFrom(r, inUse);
try {
returnTestResource(r.get());
if (available.size() < keep) {
available.push_back(r);
}
}
catch (...) {
}
poolSize.release();
}
template<typename R>
void
ResourcePool<R>::discard(const std::shared_ptr<R> & r)
{
Lock(lock);
removeFrom(r, inUse);
poolSize.release();
}
template<typename R>
void
ResourcePool<R>::removeFrom(const std::shared_ptr<R> & r, InUse & inUse)
{
auto rs = inUse.equal_range(std::this_thread::get_id());
for (auto & ri = rs.first; ri != rs.second; ri++) {
if (std::get<0>(*ri->second) == r) {
inUse.erase(ri);
return;
}
}
}
template<typename R> TimeOutOnResourcePoolT<R>::TimeOutOnResourcePoolT() : TimeOutOnResourcePool(typeid(R).name())
{
}
template<typename R>
NoCurrentResourceT<R>::NoCurrentResourceT(const std::thread::id & id) : NoCurrentResource(id, typeid(R).name())
{
}
}
#endif
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