handler.cpp

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// Copyright (c) 2018 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include <interfaces/handler.h>
 
#include <util/system.h>
 
#include <boost/signals2/connection.hpp>
#include <utility>
 
namespace interfaces {
namespace {
 
    class HandlerImpl : public Handler {
    public:
        explicit HandlerImpl(boost::signals2::connection connection)
            : m_connection(std::move(connection)) {}
 
        void disconnect() override { m_connection.disconnect(); }
 
        boost::signals2::scoped_connection m_connection;
    };
 
    class CleanupHandler : public Handler {
    public:
        explicit CleanupHandler(std::function<void()> cleanup)
            : m_cleanup(std::move(cleanup)) {}
        ~CleanupHandler() override {
            if (!m_cleanup) {
                return;
            }
            m_cleanup();
            m_cleanup = nullptr;
        }
        void disconnect() override {
            if (!m_cleanup) {
                return;
            }
            m_cleanup();
            m_cleanup = nullptr;
        }
        std::function<void()> m_cleanup;
    };
 
} // namespace
 
std::unique_ptr<Handler> MakeHandler(boost::signals2::connection connection) {
    return std::make_unique<HandlerImpl>(std::move(connection));
}
 
std::unique_ptr<Handler> MakeHandler(std::function<void()> cleanup) {
    return std::make_unique<CleanupHandler>(std::move(cleanup));
}
 
} // namespace interfaces