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/* Copyright (c) 2016-2025. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#ifndef S4U_CHORD_HPP
#define S4U_CHORD_HPP
#include "simgrid/s4u.hpp"
#include <string>
#include <xbt/random.hpp>
namespace sg4 = simgrid::s4u;
constexpr double MAX_SIMULATION_TIME = 1000;
constexpr double PERIODIC_STABILIZE_DELAY = 20;
constexpr double PERIODIC_FIX_FINGERS_DELAY = 120;
constexpr double PERIODIC_CHECK_PREDECESSOR_DELAY = 120;
constexpr double PERIODIC_LOOKUP_DELAY = 10;
constexpr double SLEEP_DELAY = 4.9999;
/* Types of tasks exchanged between nodes. */
enum class MessageType {
FIND_SUCCESSOR,
FIND_SUCCESSOR_ANSWER,
GET_PREDECESSOR,
GET_PREDECESSOR_ANSWER,
NOTIFY,
SUCCESSOR_LEAVING,
PREDECESSOR_LEAVING,
PREDECESSOR_ALIVE,
PREDECESSOR_ALIVE_ANSWER
};
class ChordMessage {
public:
MessageType type; // type of message
std::string issuer_host_name = sg4::this_actor::get_host()->get_name(); // used for logging
int request_id = -1; // id (used by some types of messages)
int request_finger = 1; // finger parameter (used by some types of messages)
int answer_id = -1; // answer (used by some types of messages)
sg4::Mailbox* answer_to = nullptr; // mailbox to send an answer to (if any)
explicit ChordMessage(MessageType type) : type(type) {}
static void destroy(void* message);
};
class Node {
inline static int nb_bits_;
inline static int nb_keys_;
inline static int timeout_;
int known_id_ = -1;
double start_time_ = -1;
double deadline_ = -1;
bool joined_ = false;
int id_; // my id
int pred_id_ = -1; // predecessor id
simgrid::xbt::random::XbtRandom random_; // random number generator for this node
sg4::Mailbox* mailbox_; // my mailbox
std::vector<int> fingers_; // finger table,(fingers[0] is my successor)
int next_finger_to_fix_; // index of the next finger to fix in fix_fingers()
static bool is_in_interval(int id, int start, int end);
public:
static void set_parameters(int nb_bits, int nb_keys, int timeout);
explicit Node(std::vector<std::string> args);
Node(const Node&) = delete;
Node& operator=(const Node&) = delete;
void join(int known_id);
void leave();
void notifyAndQuit();
void randomLookup();
void setFinger(int finger_index, int id);
void fixFingers();
void printFingerTable();
void setPredecessor(int predecessor_id);
void checkPredecessor();
int remoteGetPredecessor(int ask_to);
int closestPrecedingFinger(int id);
int findSuccessor(int id);
int remoteFindSuccessor(int ask_to, int id);
void notify(int predecessor_candidate_id);
void remoteNotify(int notify_id, int predecessor_candidate_id) const;
void stabilize();
void handleMessage(ChordMessage* message);
void operator()();
};
#endif
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