1 /* Copyright (c) 2012-2020. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "s4u-tracker.hpp"
10 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_bt_tracker, "Messages specific for the tracker");
12 Tracker::Tracker(std::vector<std::string> args)
15 xbt_assert(args.size() == 2, "Wrong number of arguments for the tracker.");
16 // Retrieving end time
18 deadline = std::stod(args[1]);
19 } catch (const std::invalid_argument&) {
20 throw std::invalid_argument("Invalid deadline:" + args[1]);
22 xbt_assert(deadline > 0, "Wrong deadline supplied");
24 mailbox = simgrid::s4u::Mailbox::by_name(TRACKER_MAILBOX);
26 XBT_INFO("Tracker launched.");
29 void Tracker::operator()()
31 simgrid::s4u::CommPtr comm = nullptr;
32 void* received = nullptr;
33 while (simgrid::s4u::Engine::get_clock() < deadline) {
35 comm = mailbox->get_async(&received);
37 // Retrieve the data sent by the peer.
38 xbt_assert(received != nullptr);
39 TrackerQuery* tq = static_cast<TrackerQuery*>(received);
41 // Add the peer to our peer list, if not already known.
42 if (known_peers.find(tq->getPeerId()) == known_peers.end()) {
43 known_peers.insert(tq->getPeerId());
46 // Sending back peers to the requesting peer
47 TrackerAnswer* ta = new TrackerAnswer(TRACKER_QUERY_INTERVAL);
48 std::set<int>::iterator next_peer;
49 int nb_known_peers = known_peers.size();
50 int max_tries = std::min(MAXIMUM_PEERS, nb_known_peers);
52 while (tried < max_tries) {
54 next_peer = known_peers.begin();
55 std::advance(next_peer, random.uniform_int(0, nb_known_peers - 1));
56 } while (ta->getPeers().find(*next_peer) != ta->getPeers().end());
57 ta->addPeer(*next_peer);
60 tq->getReturnMailbox()->put_init(ta, TRACKER_COMM_SIZE)->detach();
65 simgrid::s4u::this_actor::sleep_for(1);
68 XBT_INFO("Tracker is leaving");