1 /* Copyright (c) 2016-2021. 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>
13 constexpr double MAX_SIMULATION_TIME = 1000;
14 constexpr double PERIODIC_STABILIZE_DELAY = 20;
15 constexpr double PERIODIC_FIX_FINGERS_DELAY = 120;
16 constexpr double PERIODIC_CHECK_PREDECESSOR_DELAY = 120;
17 constexpr double PERIODIC_LOOKUP_DELAY = 10;
18 constexpr double SLEEP_DELAY = 4.9999;
24 /* Types of tasks exchanged between nodes. */
25 enum class MessageType {
27 FIND_SUCCESSOR_ANSWER,
29 GET_PREDECESSOR_ANSWER,
34 PREDECESSOR_ALIVE_ANSWER
39 MessageType type; // type of message
40 std::string issuer_host_name = simgrid::s4u::this_actor::get_host()->get_name(); // used for logging
41 int request_id = -1; // id (used by some types of messages)
42 int request_finger = 1; // finger parameter (used by some types of messages)
43 int answer_id = -1; // answer (used by some types of messages)
44 simgrid::s4u::Mailbox* answer_to = nullptr; // mailbox to send an answer to (if any)
46 explicit ChordMessage(MessageType type) : type(type) {}
48 static void destroy(void* message);
53 double start_time_ = -1;
54 double deadline_ = -1;
57 int pred_id_ = -1; // predecessor id
58 simgrid::xbt::random::XbtRandom random; // random number generator for this node
59 simgrid::s4u::Mailbox* mailbox_; // my mailbox
60 std::vector<int> fingers_; // finger table,(fingers[0] is my successor)
61 int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
64 explicit Node(std::vector<std::string> args);
65 Node(const Node&) = delete;
66 Node& operator=(const Node&) = delete;
67 void join(int known_id);
72 void setFinger(int finger_index, int id);
74 void printFingerTable();
76 void setPredecessor(int predecessor_id);
77 void checkPredecessor();
78 int remoteGetPredecessor(int ask_to);
79 int closestPrecedingFinger(int id);
80 int findSuccessor(int id);
81 int remoteFindSuccessor(int ask_to, int id);
83 void notify(int predecessor_candidate_id);
84 void remoteNotify(int notify_id, int predecessor_candidate_id) const;
86 void handleMessage(ChordMessage* message);