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230 lines (206 loc) · 8.48 KB
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/******************************************************************************\
* ___ __ *
* /\_ \ __/\ \ *
* \//\ \ /\_\ \ \____ ___ _____ _____ __ *
* \ \ \ \/\ \ \ '__`\ /'___\/\ '__`\/\ '__`\ /'__`\ *
* \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_ *
* /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\ *
* \/____/ \/_/\/___/ \/____/ \ \ \/ \ \ \/ \/__/\/_/ *
* \ \_\ \ \_\ *
* \/_/ \/_/ *
* *
* Copyright (C) 2011-2013 *
* Dominik Charousset <dominik.charousset@haw-hamburg.de> *
* *
* This file is part of libcppa. *
* libcppa is free software: you can redistribute it and/or modify it under *
* the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, *
* or (at your option) any later version. *
* *
* libcppa is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with libcppa. If not, see <http://www.gnu.org/licenses/>. *
\******************************************************************************/
#include "cppa/config.hpp"
#include <map>
#include <mutex>
#include <atomic>
#include <stdexcept>
#include "cppa/atom.hpp"
#include "cppa/config.hpp"
#include "cppa/logging.hpp"
#include "cppa/any_tuple.hpp"
#include "cppa/singletons.hpp"
#include "cppa/actor_addr.hpp"
#include "cppa/abstract_actor.hpp"
#include "cppa/message_header.hpp"
#include "cppa/system_messages.hpp"
#include "cppa/io/middleman.hpp"
#include "cppa/util/shared_spinlock.hpp"
#include "cppa/util/shared_lock_guard.hpp"
#include "cppa/detail/raw_access.hpp"
#include "cppa/detail/actor_registry.hpp"
#include "cppa/detail/singleton_manager.hpp"
namespace cppa {
namespace { typedef std::unique_lock<std::mutex> guard_type; }
// m_exit_reason is guaranteed to be set to 0, i.e., exit_reason::not_exited,
// by std::atomic<> constructor
abstract_actor::abstract_actor(actor_id aid)
: m_id(aid), m_is_proxy(true), m_exit_reason(exit_reason::not_exited) { }
abstract_actor::abstract_actor()
: m_id(get_actor_registry()->next_id()), m_is_proxy(false)
, m_exit_reason(exit_reason::not_exited) {
m_node = get_middleman()->node();
}
bool abstract_actor::link_to_impl(const actor_addr& other) {
if (other && other != this) {
guard_type guard{m_mtx};
auto ptr = detail::raw_access::get(other);
// send exit message if already exited
if (exited()) {
ptr->enqueue({address(), ptr},
make_any_tuple(exit_msg{address(), exit_reason()}));
}
// add link if not already linked to other
// (checked by establish_backlink)
else if (ptr->establish_backlink(address())) {
m_links.push_back(ptr);
return true;
}
}
return false;
}
bool abstract_actor::attach(attachable_ptr ptr) {
if (ptr == nullptr) {
guard_type guard{m_mtx};
return m_exit_reason == exit_reason::not_exited;
}
std::uint32_t reason;
{ // lifetime scope of guard
guard_type guard{m_mtx};
reason = m_exit_reason;
if (reason == exit_reason::not_exited) {
m_attachables.push_back(std::move(ptr));
return true;
}
}
ptr->actor_exited(reason);
return false;
}
void abstract_actor::detach(const attachable::token& what) {
attachable_ptr ptr;
{ // lifetime scope of guard
guard_type guard{m_mtx};
auto end = m_attachables.end();
auto i = std::find_if(
m_attachables.begin(), end,
[&](attachable_ptr& p) { return p->matches(what); });
if (i != end) {
ptr = std::move(*i);
m_attachables.erase(i);
}
}
// ptr will be destroyed here, without locked mutex
}
void abstract_actor::link_to(const actor_addr& other) {
static_cast<void>(link_to_impl(other));
}
void abstract_actor::unlink_from(const actor_addr& other) {
static_cast<void>(unlink_from_impl(other));
}
bool abstract_actor::remove_backlink(const actor_addr& other) {
if (other && other != this) {
guard_type guard{m_mtx};
auto i = std::find(m_links.begin(), m_links.end(), other);
if (i != m_links.end()) {
m_links.erase(i);
return true;
}
}
return false;
}
bool abstract_actor::establish_backlink(const actor_addr& other) {
std::uint32_t reason = exit_reason::not_exited;
if (other && other != this) {
guard_type guard{m_mtx};
reason = m_exit_reason;
if (reason == exit_reason::not_exited) {
auto i = std::find(m_links.begin(), m_links.end(), other);
if (i == m_links.end()) {
m_links.push_back(detail::raw_access::get(other));
return true;
}
}
}
// send exit message without lock
if (reason != exit_reason::not_exited) {
auto ptr = detail::raw_access::unsafe_cast(other);
ptr->enqueue({address(), ptr},
make_any_tuple(exit_msg{address(), exit_reason()}));
}
return false;
}
bool abstract_actor::unlink_from_impl(const actor_addr& other) {
if (!other) return false;
guard_type guard{m_mtx};
// remove_backlink returns true if this actor is linked to other
auto ptr = detail::raw_access::get(other);
if (!exited() && ptr->remove_backlink(address())) {
auto i = std::find(m_links.begin(), m_links.end(), ptr);
CPPA_REQUIRE(i != m_links.end());
m_links.erase(i);
return true;
}
return false;
}
actor_addr abstract_actor::address() const {
return actor_addr{const_cast<abstract_actor*>(this)};
}
void abstract_actor::cleanup(std::uint32_t reason) {
// log as 'actor'
CPPA_LOGM_TRACE("cppa::actor", CPPA_ARG(m_id) << ", " << CPPA_ARG(reason)
<< ", " << CPPA_ARG(m_is_proxy));
CPPA_REQUIRE(reason != exit_reason::not_exited);
// move everyhting out of the critical section before processing it
decltype(m_links) mlinks;
decltype(m_attachables) mattachables;
{ // lifetime scope of guard
guard_type guard{m_mtx};
if (m_exit_reason != exit_reason::not_exited) {
// already exited
return;
}
m_exit_reason = reason;
mlinks = std::move(m_links);
mattachables = std::move(m_attachables);
// make sure lists are empty
m_links.clear();
m_attachables.clear();
}
CPPA_LOGC_INFO_IF(not is_proxy(), "cppa::actor", __func__,
"actor with ID " << m_id << " had " << mlinks.size()
<< " links and " << mattachables.size()
<< " attached functors; exit reason = " << reason
<< ", class = " << detail::demangle(typeid(*this)));
// send exit messages
auto msg = make_any_tuple(exit_msg{address(), reason});
CPPA_LOGM_DEBUG("cppa::actor", "send EXIT to " << mlinks.size() << " links");
for (auto& aptr : mlinks) {
aptr->enqueue({address(), aptr, message_id{}.with_high_priority()}, msg);
}
CPPA_LOGM_DEBUG("cppa::actor", "run " << mattachables.size()
<< " attachables");
for (attachable_ptr& ptr : mattachables) {
ptr->actor_exited(reason);
}
}
std::set<std::string> abstract_actor::interface() const {
// defaults to untyped
return std::set<std::string>{};
}
} // namespace cppa
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