serverstate.cpp
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/* Copyright (C) 2019
*
* This file is part of the osdev components suite
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "serverstate.h"
using namespace osdev::components::mqtt;
const std::string ServerState::s_identifier("ServerState");
std::atomic<StateChangeCallbackHandle> ServerState::s_nextServerStateCallbackHandle(1);
ServerState::ServerState(const IStateCallback* stateCallbackIf)
: sig_serverStateChanged()
, m_stateCallbackIf(stateCallbackIf)
, m_serverStateCallbackMap()
, m_state(StateEnum::Unknown)
{
}
ServerState::~ServerState()
{
try {
this->clearAllStateChangeCallbacks();
}
catch (...) {
}
}
StateChangeCallbackHandle ServerState::registerStateChangeCallback(const IStateCallback::SlotStateChange& cb)
{
const auto handle = s_nextServerStateCallbackHandle++;
m_serverStateCallbackMap.emplace(std::piecewise_construct,
std::make_tuple(handle),
std::make_tuple(sig_serverStateChanged.connect(cb)));
return handle;
}
void ServerState::unregisterStateChangeCallback(StateChangeCallbackHandle handle)
{
m_serverStateCallbackMap.erase(handle);
}
void ServerState::clearAllStateChangeCallbacks()
{
this->emitStateChanged(StateEnum::Unregister);
m_serverStateCallbackMap.clear();
}
void ServerState::emitStateChanged(StateEnum newState)
{
m_state = newState; ///< store state, to allow clients to retrieve the last received state.
if (nullptr != m_stateCallbackIf) {
sig_serverStateChanged(m_stateCallbackIf, newState);
}
}
StateEnum ServerState::state() const
{
return m_state;
}
std::string ServerState::stateCallbackClientId() const
{
static const std::string nullId = "null";
return (nullptr == m_stateCallbackIf) ? nullId : m_stateCallbackIf->clientId();
}