BasicNetwork.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#ifndef RIPPLE_TEST_CSF_BASICNETWORK_H_INCLUDED
#define RIPPLE_TEST_CSF_BASICNETWORK_H_INCLUDED
 
#include <test/csf/Scheduler.h>
#include <test/csf/Digraph.h>
 
namespace ripple {
namespace test {
namespace csf {
template <class Peer>
class BasicNetwork
{
    using peer_type = Peer;
 
    using clock_type = Scheduler::clock_type;
 
    using duration = typename clock_type::duration;
 
    using time_point = typename clock_type::time_point;
 
    struct link_type
    {
        bool inbound = false;
        duration delay{};
        time_point established{};
        link_type() = default;
        link_type(bool inbound_, duration delay_, time_point established_)
            : inbound(inbound_), delay(delay_), established(established_)
        {
        }
    };
 
    Scheduler& scheduler;
    Digraph<Peer, link_type> links_;
 
public:
    BasicNetwork(BasicNetwork const&) = delete;
    BasicNetwork&
    operator=(BasicNetwork const&) = delete;
 
    BasicNetwork(Scheduler& s);
 
    bool
    connect(
        Peer const& from,
        Peer const& to,
        duration const& delay = std::chrono::seconds{0});
 
    bool
    disconnect(Peer const& peer1, Peer const& peer2);
 
    template <class Function>
    void
    send(Peer const& from, Peer const& to, Function&& f);
 
 
    auto
    links(Peer const& from)
    {
        return links_.outEdges(from);
    }
 
    Digraph<Peer, link_type> const &
    graph() const
    {
        return links_;
    }
};
//------------------------------------------------------------------------------
template <class Peer>
BasicNetwork<Peer>::BasicNetwork(Scheduler& s) : scheduler(s)
{
}
 
template <class Peer>
inline bool
BasicNetwork<Peer>::connect(
    Peer const& from,
    Peer const& to,
    duration const& delay)
{
    if (to == from)
        return false;
    time_point const now = scheduler.now();
    if(!links_.connect(from, to, link_type{false, delay, now}))
        return false;
    auto const result = links_.connect(to, from, link_type{true, delay, now});
    (void)result;
    assert(result);
    return true;
}
 
template <class Peer>
inline bool
BasicNetwork<Peer>::disconnect(Peer const& peer1, Peer const& peer2)
{
    if (! links_.disconnect(peer1, peer2))
        return false;
    bool r = links_.disconnect(peer2, peer1);
    (void)r;
    assert(r);
    return true;
}
 
template <class Peer>
template <class Function>
inline void
BasicNetwork<Peer>::send(Peer const& from, Peer const& to, Function&& f)
{
    auto link = links_.edge(from,to);
    if(!link)
        return;
    time_point const sent = scheduler.now();
    scheduler.in(
        link->delay,
        [ from, to, sent, f = std::forward<Function>(f), this ] {
            // only process if still connected and connection was
            // not broken since the message was sent
            if (auto l = links_.edge(from, to);
                l && l->established <= sent)
            {
                f();
            }
        });
}
 
}  // namespace csf
}  // namespace test
}  // namespace ripple
 
#endif