+++ /dev/null
-/* Copyright (c) 2016-2018. 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/RngStream.h>
-#include <xbt/str.h>
-
-#define MAX_SIMULATION_TIME 1000
-#define PERIODIC_STABILIZE_DELAY 20
-#define PERIODIC_FIX_FINGERS_DELAY 120
-#define PERIODIC_CHECK_PREDECESSOR_DELAY 120
-#define PERIODIC_LOOKUP_DELAY 10
-#define SLEEP_DELAY 4.9999
-
-extern int nb_bits;
-extern int nb_keys;
-extern int timeout;
-
-class HostChord {
- RngStream stream_;
- simgrid::s4u::Host* host = nullptr;
-
-public:
- static simgrid::xbt::Extension<simgrid::s4u::Host, HostChord> EXTENSION_ID;
-
- explicit HostChord(simgrid::s4u::Host* ptr) : host(ptr)
- {
- std::string descr = std::string("RngSream<") + host->get_cname() + ">";
- stream_ = RngStream_CreateStream(descr.c_str());
- }
-
- ~HostChord() { RngStream_DeleteStream(&stream_); };
-
- RngStream getStream() { return stream_; };
-};
-
-/* Types of tasks exchanged between nodes. */
-enum e_message_type_t {
- FIND_SUCCESSOR,
- FIND_SUCCESSOR_ANSWER,
- GET_PREDECESSOR,
- GET_PREDECESSOR_ANSWER,
- NOTIFY,
- SUCCESSOR_LEAVING,
- PREDECESSOR_LEAVING,
- PREDECESSOR_ALIVE,
- PREDECESSOR_ALIVE_ANSWER
-};
-
-class ChordMessage {
-public:
- e_message_type_t type; // type of message
- std::string issuer_host_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)
- simgrid::s4u::MailboxPtr answer_to; // mailbox to send an answer to (if any)
-
- explicit ChordMessage(e_message_type_t type)
- : type(type), issuer_host_name(simgrid::s4u::this_actor::get_host()->get_name())
- {
- }
-
- ~ChordMessage() = default;
-
- static void destroy(void* message);
-};
-
-class Node {
- 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::s4u::MailboxPtr mailbox_; // my mailbox
- int* fingers_; // finger table,(fingers[0] is my successor)
- int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
- RngStream stream;
-
-public:
- explicit Node(std::vector<std::string> args);
- Node(const Node&) = delete;
- Node& operator=(const Node&) = delete;
- ~Node();
- 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);
- void stabilize();
- void handleMessage(ChordMessage* message);
-
- void operator()()
- {
- simgrid::s4u::this_actor::sleep_for(start_time_);
- if (known_id_ == -1) {
- setPredecessor(-1); // -1 means that I have no predecessor
- printFingerTable();
- joined = true;
- } else {
- join(known_id_);
- }
-
- if (not joined)
- return;
- void* data = nullptr;
- double now = simgrid::s4u::Engine::get_clock();
- double next_stabilize_date = start_time_ + PERIODIC_STABILIZE_DELAY;
- double next_fix_fingers_date = start_time_ + PERIODIC_FIX_FINGERS_DELAY;
- double next_check_predecessor_date = start_time_ + PERIODIC_CHECK_PREDECESSOR_DELAY;
- double next_lookup_date = start_time_ + PERIODIC_LOOKUP_DELAY;
- simgrid::s4u::CommPtr comm_receive = nullptr;
- while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME) {
- if (comm_receive == nullptr)
- comm_receive = mailbox_->get_async(&data);
- while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME && not comm_receive->test()) {
- // no task was received: make some periodic calls
- if (now >= next_stabilize_date) {
- stabilize();
- next_stabilize_date = simgrid::s4u::Engine::get_clock() + PERIODIC_STABILIZE_DELAY;
- } else if (now >= next_fix_fingers_date) {
- fixFingers();
- next_fix_fingers_date = simgrid::s4u::Engine::get_clock() + PERIODIC_FIX_FINGERS_DELAY;
- } else if (now >= next_check_predecessor_date) {
- checkPredecessor();
- next_check_predecessor_date = simgrid::s4u::Engine::get_clock() + PERIODIC_CHECK_PREDECESSOR_DELAY;
- } else if (now >= next_lookup_date) {
- randomLookup();
- next_lookup_date = simgrid::s4u::Engine::get_clock() + PERIODIC_LOOKUP_DELAY;
- } else {
- // nothing to do: sleep for a while
- simgrid::s4u::this_actor::sleep_for(SLEEP_DELAY);
- }
- now = simgrid::s4u::Engine::get_clock();
- }
-
- if (data != nullptr) {
- ChordMessage* message = static_cast<ChordMessage*>(data);
- handleMessage(message);
- comm_receive = nullptr;
- data = nullptr;
- }
- now = simgrid::s4u::Engine::get_clock();
- }
- if (comm_receive != nullptr) {
- if (comm_receive->test())
- delete static_cast<ChordMessage*>(data);
- else
- comm_receive->cancel();
- }
- // leave the ring
- leave();
- }
-};
-
-#endif
