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//
// detail/impl/service_registry.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_IMPL_SERVICE_REGISTRY_IPP
#define ASIO_DETAIL_IMPL_SERVICE_REGISTRY_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include <vector>
#include "asio/detail/service_registry.hpp"
#include "asio/detail/throw_exception.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
service_registry::service_registry(execution_context& owner)
: owner_(owner),
first_service_(0)
{
}
service_registry::~service_registry()
{
}
void service_registry::shutdown_services()
{
execution_context::service* service = first_service_;
while (service)
{
service->shutdown();
service = service->next_;
}
}
void service_registry::destroy_services()
{
while (first_service_)
{
execution_context::service* next_service = first_service_->next_;
destroy(first_service_);
first_service_ = next_service;
}
}
void service_registry::notify_fork(execution_context::fork_event fork_ev)
{
// Make a copy of all of the services while holding the lock. We don't want
// to hold the lock while calling into each service, as it may try to call
// back into this class.
std::vector<execution_context::service*> services;
{
asio::detail::mutex::scoped_lock lock(mutex_);
execution_context::service* service = first_service_;
while (service)
{
services.push_back(service);
service = service->next_;
}
}
// If processing the fork_prepare event, we want to go in reverse order of
// service registration, which happens to be the existing order of the
// services in the vector. For the other events we want to go in the other
// direction.
std::size_t num_services = services.size();
if (fork_ev == execution_context::fork_prepare)
for (std::size_t i = 0; i < num_services; ++i)
services[i]->notify_fork(fork_ev);
else
for (std::size_t i = num_services; i > 0; --i)
services[i - 1]->notify_fork(fork_ev);
}
void service_registry::init_key_from_id(execution_context::service::key& key,
const execution_context::id& id)
{
key.type_info_ = 0;
key.id_ = &id;
}
bool service_registry::keys_match(
const execution_context::service::key& key1,
const execution_context::service::key& key2)
{
if (key1.id_ && key2.id_)
if (key1.id_ == key2.id_)
return true;
if (key1.type_info_ && key2.type_info_)
if (*key1.type_info_ == *key2.type_info_)
return true;
return false;
}
void service_registry::destroy(execution_context::service* service)
{
delete service;
}
execution_context::service* service_registry::do_use_service(
const execution_context::service::key& key,
factory_type factory, void* owner)
{
asio::detail::mutex::scoped_lock lock(mutex_);
// First see if there is an existing service object with the given key.
execution_context::service* service = first_service_;
while (service)
{
if (keys_match(service->key_, key))
return service;
service = service->next_;
}
// Create a new service object. The service registry's mutex is not locked
// at this time to allow for nested calls into this function from the new
// service's constructor.
lock.unlock();
auto_service_ptr new_service = { factory(owner) };
new_service.ptr_->key_ = key;
lock.lock();
// Check that nobody else created another service object of the same type
// while the lock was released.
service = first_service_;
while (service)
{
if (keys_match(service->key_, key))
return service;
service = service->next_;
}
// Service was successfully initialised, pass ownership to registry.
new_service.ptr_->next_ = first_service_;
first_service_ = new_service.ptr_;
new_service.ptr_ = 0;
return first_service_;
}
void service_registry::do_add_service(
const execution_context::service::key& key,
execution_context::service* new_service)
{
if (&owner_ != &new_service->context())
asio::detail::throw_exception(invalid_service_owner());
asio::detail::mutex::scoped_lock lock(mutex_);
// Check if there is an existing service object with the given key.
execution_context::service* service = first_service_;
while (service)
{
if (keys_match(service->key_, key))
asio::detail::throw_exception(service_already_exists());
service = service->next_;
}
// Take ownership of the service object.
new_service->key_ = key;
new_service->next_ = first_service_;
first_service_ = new_service;
}
bool service_registry::do_has_service(
const execution_context::service::key& key) const
{
asio::detail::mutex::scoped_lock lock(mutex_);
execution_context::service* service = first_service_;
while (service)
{
if (keys_match(service->key_, key))
return true;
service = service->next_;
}
return false;
}
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_IMPL_SERVICE_REGISTRY_IPP
|
