1 /* Copyright (c) 2016-2023. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "simgrid/s4u.hpp"
10 #include <xbt/random.hpp>
12 namespace sg4 = simgrid::s4u;
14 constexpr double MAX_SIMULATION_TIME = 1000;
15 constexpr double PERIODIC_STABILIZE_DELAY = 20;
16 constexpr double PERIODIC_FIX_FINGERS_DELAY = 120;
17 constexpr double PERIODIC_CHECK_PREDECESSOR_DELAY = 120;
18 constexpr double PERIODIC_LOOKUP_DELAY = 10;
19 constexpr double SLEEP_DELAY = 4.9999;
25 /* Types of tasks exchanged between nodes. */
26 enum class MessageType {
28 FIND_SUCCESSOR_ANSWER,
30 GET_PREDECESSOR_ANSWER,
35 PREDECESSOR_ALIVE_ANSWER
40 MessageType type; // type of message
41 std::string issuer_host_name = sg4::this_actor::get_host()->get_name(); // used for logging
42 int request_id = -1; // id (used by some types of messages)
43 int request_finger = 1; // finger parameter (used by some types of messages)
44 int answer_id = -1; // answer (used by some types of messages)
45 sg4::Mailbox* answer_to = nullptr; // mailbox to send an answer to (if any)
47 explicit ChordMessage(MessageType type) : type(type) {}
49 static void destroy(void* message);
54 double start_time_ = -1;
55 double deadline_ = -1;
58 int pred_id_ = -1; // predecessor id
59 simgrid::xbt::random::XbtRandom random; // random number generator for this node
60 sg4::Mailbox* mailbox_; // my mailbox
61 std::vector<int> fingers_; // finger table,(fingers[0] is my successor)
62 int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
65 explicit Node(std::vector<std::string> args);
66 Node(const Node&) = delete;
67 Node& operator=(const Node&) = delete;
68 void join(int known_id);
73 void setFinger(int finger_index, int id);
75 void printFingerTable();
77 void setPredecessor(int predecessor_id);
78 void checkPredecessor();
79 int remoteGetPredecessor(int ask_to);
80 int closestPrecedingFinger(int id);
81 int findSuccessor(int id);
82 int remoteFindSuccessor(int ask_to, int id);
84 void notify(int predecessor_candidate_id);
85 void remoteNotify(int notify_id, int predecessor_candidate_id) const;
87 void handleMessage(ChordMessage* message);