-/* Copyright (c) 2010-2019. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2010-2021. 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. */
* @param id id to check
* @param start lower bound
* @param end upper bound
- * @return a non-zero value if id in in [start, end]
+ * @return true if id in in [start, end]
*/
-static int is_in_interval(int id, int start, int end)
+static bool is_in_interval(int id, int start, int end)
{
int i = id % nb_keys;
int s = start % nb_keys;
// initialize my node
id_ = std::stoi(args[1]);
+ XBT_DEBUG("Initialize node with id: %d", id_);
+ random.set_seed(id_);
mailbox_ = simgrid::s4u::Mailbox::by_name(std::to_string(id_));
next_finger_to_fix = 0;
fingers_.resize(nb_bits, id_);
void Node::notifyAndQuit()
{
// send the PREDECESSOR_LEAVING to our successor
- ChordMessage* pred_msg = new ChordMessage(PREDECESSOR_LEAVING);
+ auto* pred_msg = new ChordMessage(MessageType::PREDECESSOR_LEAVING);
pred_msg->request_id = pred_id_;
pred_msg->answer_to = mailbox_;
if (pred_id_ != -1 && pred_id_ != id_) {
// send the SUCCESSOR_LEAVING to our predecessor (only if I have one that is not me)
- ChordMessage* succ_msg = new ChordMessage(SUCCESSOR_LEAVING);
+ auto* succ_msg = new ChordMessage(MessageType::SUCCESSOR_LEAVING);
succ_msg->request_id = fingers_[0];
succ_msg->answer_to = mailbox_;
XBT_DEBUG("Sending a 'SUCCESSOR_LEAVING' to my predecessor %d", pred_id_);
void Node::randomLookup()
{
int res = id_;
- int random_index = simgrid::xbt::random::uniform_int(0, nb_bits - 1);
+ int random_index = random.uniform_int(0, nb_bits - 1);
int random_id = fingers_[random_index];
XBT_DEBUG("Making a lookup request for id %d", random_id);
if (random_id != id_)
void Node::checkPredecessor()
{
XBT_DEBUG("Checking whether my predecessor is alive");
- void* data = nullptr;
if (pred_id_ == -1)
return;
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(pred_id_));
simgrid::s4u::Mailbox* return_mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(id_) + "_is_alive");
- ChordMessage* message = new ChordMessage(PREDECESSOR_ALIVE);
+ auto* message = new ChordMessage(MessageType::PREDECESSOR_ALIVE);
message->request_id = pred_id_;
message->answer_to = return_mailbox;
// receive the answer
XBT_DEBUG("Sent 'Predecessor Alive' request to %d, waiting for the answer on my mailbox '%s'", pred_id_,
message->answer_to->get_cname());
- simgrid::s4u::CommPtr comm = return_mailbox->get_async(&data);
+ ChordMessage* answer = nullptr;
+ simgrid::s4u::CommPtr comm = return_mailbox->get_async<ChordMessage>(&answer);
try {
comm->wait_for(timeout);
XBT_DEBUG("Received the answer to my 'Predecessor Alive': my predecessor %d is alive", pred_id_);
- delete static_cast<ChordMessage*>(data);
+ delete answer;
} catch (const simgrid::TimeoutException&) {
XBT_DEBUG("Failed to receive the answer to my 'Predecessor Alive' request");
pred_id_ = -1;
int Node::remoteGetPredecessor(int ask_to)
{
int predecessor_id = -1;
- void* data = nullptr;
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(ask_to));
simgrid::s4u::Mailbox* return_mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(id_) + "_pred");
- ChordMessage* message = new ChordMessage(GET_PREDECESSOR);
+ auto* message = new ChordMessage(MessageType::GET_PREDECESSOR);
message->request_id = id_;
message->answer_to = return_mailbox;
// receive the answer
XBT_DEBUG("Sent 'Get Predecessor' request to %d, waiting for the answer on my mailbox '%s'", ask_to,
message->answer_to->get_cname());
- simgrid::s4u::CommPtr comm = return_mailbox->get_async(&data);
+ ChordMessage* answer = nullptr;
+ simgrid::s4u::CommPtr comm = return_mailbox->get_async<ChordMessage>(&answer);
try {
comm->wait_for(timeout);
- const ChordMessage* answer = static_cast<ChordMessage*>(data);
XBT_DEBUG("Received the answer to my 'Get Predecessor' request: the predecessor of node %d is %d", ask_to,
answer->answer_id);
predecessor_id = answer->answer_id;
delete answer;
} catch (const simgrid::TimeoutException&) {
XBT_DEBUG("Failed to receive the answer to my 'Get Predecessor' request");
- delete static_cast<ChordMessage*>(data);
+ delete answer;
}
return predecessor_id;
int Node::remoteFindSuccessor(int ask_to, int id)
{
int successor = -1;
- void* data = nullptr;
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(ask_to));
simgrid::s4u::Mailbox* return_mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(id_) + "_succ");
- ChordMessage* message = new ChordMessage(FIND_SUCCESSOR);
+ auto* message = new ChordMessage(MessageType::FIND_SUCCESSOR);
message->request_id = id_;
message->answer_to = return_mailbox;
}
// receive the answer
XBT_DEBUG("Sent a 'Find Successor' request to %d for key %d, waiting for the answer", ask_to, id);
- simgrid::s4u::CommPtr comm = return_mailbox->get_async(&data);
+ ChordMessage* answer = nullptr;
+ simgrid::s4u::CommPtr comm = return_mailbox->get_async<ChordMessage>(&answer);
try {
comm->wait_for(timeout);
- const ChordMessage* answer = static_cast<ChordMessage*>(data);
XBT_DEBUG("Received the answer to my 'Find Successor' request for id %d: the successor of key %d is %d",
answer->request_id, id_, answer->answer_id);
successor = answer->answer_id;
delete answer;
} catch (const simgrid::TimeoutException&) {
XBT_DEBUG("Failed to receive the answer to my 'Find Successor' request");
- delete static_cast<ChordMessage*>(data);
+ delete answer;
}
return successor;
}
/* Notifies a remote node that its predecessor may have changed. */
-void Node::remoteNotify(int notify_id, int predecessor_candidate_id)
+void Node::remoteNotify(int notify_id, int predecessor_candidate_id) const
{
- ChordMessage* message = new ChordMessage(NOTIFY);
+ auto* message = new ChordMessage(MessageType::NOTIFY);
message->request_id = predecessor_candidate_id;
message->answer_to = nullptr;
void Node::handleMessage(ChordMessage* message)
{
switch (message->type) {
- case FIND_SUCCESSOR:
- XBT_DEBUG("Received a 'Find Successor' request from %s for id %d", message->issuer_host_name.c_str(),
- message->request_id);
- // is my successor the successor?
- if (is_in_interval(message->request_id, id_ + 1, fingers_[0])) {
- message->type = FIND_SUCCESSOR_ANSWER;
- message->answer_id = fingers_[0];
- XBT_DEBUG("Sending back a 'Find Successor Answer' to %s (mailbox %s): the successor of %d is %d",
- message->issuer_host_name.c_str(), message->answer_to->get_cname(), message->request_id,
- message->answer_id);
+ case MessageType::FIND_SUCCESSOR:
+ XBT_DEBUG("Received a 'Find Successor' request from %s for id %d", message->issuer_host_name.c_str(),
+ message->request_id);
+ // is my successor the successor?
+ if (is_in_interval(message->request_id, id_ + 1, fingers_[0])) {
+ message->type = MessageType::FIND_SUCCESSOR_ANSWER;
+ message->answer_id = fingers_[0];
+ XBT_DEBUG("Sending back a 'Find Successor Answer' to %s (mailbox %s): the successor of %d is %d",
+ message->issuer_host_name.c_str(), message->answer_to->get_cname(), message->request_id,
+ message->answer_id);
+ message->answer_to->put_init(message, 10)->detach(ChordMessage::destroy);
+ } else {
+ // otherwise, forward the request to the closest preceding finger in my table
+ int closest = closestPrecedingFinger(message->request_id);
+ XBT_DEBUG("Forwarding the 'Find Successor' request for id %d to my closest preceding finger %d",
+ message->request_id, closest);
+ simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(closest));
+ mailbox->put_init(message, 10)->detach(ChordMessage::destroy);
+ }
+ break;
+
+ case MessageType::GET_PREDECESSOR:
+ XBT_DEBUG("Receiving a 'Get Predecessor' request from %s", message->issuer_host_name.c_str());
+ message->type = MessageType::GET_PREDECESSOR_ANSWER;
+ message->answer_id = pred_id_;
+ XBT_DEBUG("Sending back a 'Get Predecessor Answer' to %s via mailbox '%s': my predecessor is %d",
+ message->issuer_host_name.c_str(), message->answer_to->get_cname(), message->answer_id);
+ message->answer_to->put_init(message, 10)->detach(ChordMessage::destroy);
+ break;
+
+ case MessageType::NOTIFY:
+ // someone is telling me that he may be my new predecessor
+ XBT_DEBUG("Receiving a 'Notify' request from %s", message->issuer_host_name.c_str());
+ notify(message->request_id);
+ delete message;
+ break;
+
+ case MessageType::PREDECESSOR_LEAVING:
+ // my predecessor is about to quit
+ XBT_DEBUG("Receiving a 'Predecessor Leaving' message from %s", message->issuer_host_name.c_str());
+ // modify my predecessor
+ setPredecessor(message->request_id);
+ delete message;
+ /*TODO :
+ >> notify my new predecessor
+ >> send a notify_predecessors !!
+ */
+ break;
+
+ case MessageType::SUCCESSOR_LEAVING:
+ // my successor is about to quit
+ XBT_DEBUG("Receiving a 'Successor Leaving' message from %s", message->issuer_host_name.c_str());
+ // modify my successor FIXME : this should be implicit ?
+ setFinger(0, message->request_id);
+ delete message;
+ /* TODO
+ >> notify my new successor
+ >> update my table & predecessors table */
+ break;
+
+ case MessageType::PREDECESSOR_ALIVE:
+ XBT_DEBUG("Receiving a 'Predecessor Alive' request from %s", message->issuer_host_name.c_str());
+ message->type = MessageType::PREDECESSOR_ALIVE_ANSWER;
+ XBT_DEBUG("Sending back a 'Predecessor Alive Answer' to %s (mailbox %s)", message->issuer_host_name.c_str(),
+ message->answer_to->get_cname());
message->answer_to->put_init(message, 10)->detach(ChordMessage::destroy);
+ break;
+
+ default:
+ XBT_DEBUG("Ignoring unexpected message: %d from %s", static_cast<int>(message->type),
+ message->issuer_host_name.c_str());
+ delete message;
+ }
+}
+
+void Node::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;
+ ChordMessage* message = 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 < std::min(start_time_ + deadline_, MAX_SIMULATION_TIME)) {
+ if (comm_receive == nullptr)
+ comm_receive = mailbox_->get_async<ChordMessage>(&message);
+ bool comm_completed = true;
+ try {
+ if (not comm_receive->test())
+ comm_completed = false;
+ } catch (const simgrid::TimeoutException&) {
+ XBT_DEBUG("Caught a timeout, go ahead.");
+ }
+
+ if (comm_completed) {
+ if (message != nullptr) {
+ handleMessage(message);
+ message = nullptr;
+ }
+ comm_receive = nullptr;
} else {
- // otherwise, forward the request to the closest preceding finger in my table
- int closest = closestPrecedingFinger(message->request_id);
- XBT_DEBUG("Forwarding the 'Find Successor' request for id %d to my closest preceding finger %d",
- message->request_id, closest);
- simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(closest));
- mailbox->put_init(message, 10)->detach(ChordMessage::destroy);
+ // 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);
+ }
}
- break;
-
- case GET_PREDECESSOR:
- XBT_DEBUG("Receiving a 'Get Predecessor' request from %s", message->issuer_host_name.c_str());
- message->type = GET_PREDECESSOR_ANSWER;
- message->answer_id = pred_id_;
- XBT_DEBUG("Sending back a 'Get Predecessor Answer' to %s via mailbox '%s': my predecessor is %d",
- message->issuer_host_name.c_str(), message->answer_to->get_cname(), message->answer_id);
- message->answer_to->put_init(message, 10)->detach(ChordMessage::destroy);
- break;
-
- case NOTIFY:
- // someone is telling me that he may be my new predecessor
- XBT_DEBUG("Receiving a 'Notify' request from %s", message->issuer_host_name.c_str());
- notify(message->request_id);
- delete message;
- break;
- case PREDECESSOR_LEAVING:
- // my predecessor is about to quit
- XBT_DEBUG("Receiving a 'Predecessor Leaving' message from %s", message->issuer_host_name.c_str());
- // modify my predecessor
- setPredecessor(message->request_id);
- delete message;
- /*TODO :
- >> notify my new predecessor
- >> send a notify_predecessors !!
- */
- break;
-
- case SUCCESSOR_LEAVING:
- // my successor is about to quit
- XBT_DEBUG("Receiving a 'Successor Leaving' message from %s", message->issuer_host_name.c_str());
- // modify my successor FIXME : this should be implicit ?
- setFinger(0, message->request_id);
- delete message;
- /* TODO
- >> notify my new successor
- >> update my table & predecessors table */
- break;
-
- case PREDECESSOR_ALIVE:
- XBT_DEBUG("Receiving a 'Predecessor Alive' request from %s", message->issuer_host_name.c_str());
- message->type = PREDECESSOR_ALIVE_ANSWER;
- XBT_DEBUG("Sending back a 'Predecessor Alive Answer' to %s (mailbox %s)", message->issuer_host_name.c_str(),
- message->answer_to->get_cname());
- message->answer_to->put_init(message, 10)->detach(ChordMessage::destroy);
- break;
-
- default:
- XBT_DEBUG("Ignoring unexpected message: %d from %s", message->type, message->issuer_host_name.c_str());
- delete message;
+ now = simgrid::s4u::Engine::get_clock();
+ }
+ if (comm_receive != nullptr) {
+ try {
+ if (comm_receive->test())
+ delete message;
+ else
+ comm_receive->cancel();
+ } catch (const simgrid::TimeoutException&) {
+ XBT_DEBUG("Caught a timeout for last message, nevermind.");
+ }
}
+ // leave the ring
+ leave();
}
