--- /dev/null
+/* Copyright (c) 2004-2021. 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. */
+
+#ifndef SIMGRID_KERNEL_RESOURCE_LINKIMPL_HPP
+#define SIMGRID_KERNEL_RESOURCE_LINKIMPL_HPP
+
+#include "simgrid/kernel/resource/Model.hpp"
+#include "simgrid/kernel/resource/NetworkModelIntf.hpp"
+#include "simgrid/s4u/Link.hpp"
+#include "src/kernel/lmm/maxmin.hpp"
+#include "src/kernel/resource/Resource.hpp"
+#include "xbt/PropertyHolder.hpp"
+
+#include <list>
+#include <unordered_map>
+
+/***********
+ * Classes *
+ ***********/
+class StandardLinkImpl;
+
+namespace simgrid {
+namespace kernel {
+namespace resource {
+
+/*********
+ * Model *
+ *********/
+
+/** @ingroup SURF_network_interface
+ * @brief SURF network model interface class
+ * @details A model is an object which handles the interactions between its Resources and its Actions
+ */
+class NetworkModel : public Model, public NetworkModelIntf {
+public:
+ static config::Flag<double> cfg_tcp_gamma;
+ static config::Flag<bool> cfg_crosstraffic;
+
+ using Model::Model;
+ NetworkModel(const NetworkModel&) = delete;
+ NetworkModel& operator=(const NetworkModel&) = delete;
+ ~NetworkModel() override;
+
+ /**
+ * @brief Create a [WiFi]Link
+ *
+ * @param name The name of the Link
+ * @param bandwidths The vector of bandwidths of the Link in bytes per second
+ */
+ virtual StandardLinkImpl* create_link(const std::string& name, const std::vector<double>& bandwidths) = 0;
+
+ virtual StandardLinkImpl* create_wifi_link(const std::string& name, const std::vector<double>& bandwidths) = 0;
+
+ /**
+ * @brief Create a communication between two hosts.
+ * @details It makes calls to the routing part, and execute the communication between the two end points.
+ *
+ * @param src The source of the communication
+ * @param dst The destination of the communication
+ * @param size The size of the communication in bytes
+ * @param rate Allows to limit the transfer rate. Negative value means unlimited.
+ * @return The action representing the communication
+ */
+ virtual Action* communicate(s4u::Host* src, s4u::Host* dst, double size, double rate) = 0;
+
+ /**
+ * @brief Get the right multiplicative factor for the latency.
+ * @details Depending on the model, the effective latency when sending a message might be different from the
+ * theoretical latency of the link, in function of the message size. In order to account for this, this function gets
+ * this factor.
+ *
+ * @param size The size of the message.
+ * @return The latency factor.
+ */
+ virtual double get_latency_factor(double /* size */) { return sg_latency_factor; }
+
+ /**
+ * @brief Get the right multiplicative factor for the bandwidth.
+ * @details Depending on the model, the effective bandwidth when sending a message might be different from the
+ * theoretical bandwidth of the link, in function of the message size. In order to account for this, this function
+ * gets this factor.
+ *
+ * @param size The size of the message.
+ * @return The bandwidth factor.
+ */
+ virtual double get_bandwidth_factor(double /* size*/) { return sg_bandwidth_factor; }
+
+ double next_occurring_event_full(double now) override;
+
+ void set_lat_factor_cb(const std::function<NetworkFactorCb>& cb) override { THROW_UNIMPLEMENTED; }
+ void set_bw_factor_cb(const std::function<NetworkFactorCb>& cb) override { THROW_UNIMPLEMENTED; }
+
+ StandardLinkImpl* loopback_ = nullptr;
+};
+
+/************
+ * Resource *
+ ************/
+class LinkImpl : public Resource_T<LinkImpl>, public xbt::PropertyHolder {
+public:
+ using Resource_T::Resource_T;
+ /** @brief Get the bandwidth in bytes per second of current Link */
+ virtual double get_bandwidth() const = 0;
+ /** @brief Update the bandwidth in bytes per second of current Link */
+ virtual void set_bandwidth(double value) = 0;
+
+ /** @brief Get the latency in seconds of current Link */
+ virtual double get_latency() const = 0;
+ /** @brief Update the latency in seconds of current Link */
+ virtual void set_latency(double value) = 0;
+
+ /** @brief The sharing policy */
+ virtual void set_sharing_policy(s4u::Link::SharingPolicy policy, const s4u::NonLinearResourceCb& cb) = 0;
+ virtual s4u::Link::SharingPolicy get_sharing_policy() const = 0;
+
+ /* setup the profile file with bandwidth events (peak speed changes due to external load).
+ * Profile must contain percentages (value between 0 and 1). */
+ virtual void set_bandwidth_profile(kernel::profile::Profile* profile) = 0;
+ /* setup the profile file with latency events (peak latency changes due to external load).
+ * Profile must contain absolute values */
+ virtual void set_latency_profile(kernel::profile::Profile* profile) = 0;
+ /** @brief Set the concurrency limit for this link */
+ virtual void set_concurrency_limit(int limit) const = 0;
+};
+
+/**********
+ * Action *
+ **********/
+/** @ingroup SURF_network_interface
+ * @brief SURF network action interface class
+ * @details A NetworkAction represents a communication between two [hosts](@ref HostImpl)
+ */
+class NetworkAction : public Action {
+ s4u::Host& src_;
+ s4u::Host& dst_;
+
+public:
+ /** @brief Constructor
+ *
+ * @param model The NetworkModel associated to this NetworkAction
+ * @param cost The cost of this NetworkAction in [TODO]
+ * @param failed [description]
+ */
+ NetworkAction(Model* model, s4u::Host& src, s4u::Host& dst, double cost, bool failed)
+ : Action(model, cost, failed), src_(src), dst_(dst)
+ {
+ }
+
+ /**
+ * @brief NetworkAction constructor
+ *
+ * @param model The NetworkModel associated to this NetworkAction
+ * @param cost The cost of this NetworkAction in bytes
+ * @param failed Actions can be created in a failed state
+ * @param var The lmm variable associated to this Action if it is part of a LMM component
+ */
+ NetworkAction(Model* model, s4u::Host& src, s4u::Host& dst, double cost, bool failed, lmm::Variable* var)
+ : Action(model, cost, failed, var), src_(src), dst_(dst){};
+
+ void set_state(Action::State state) override;
+ virtual std::list<StandardLinkImpl*> get_links() const;
+
+ double latency_ = 0.; // Delay before the action starts
+ double lat_current_ = 0.; // Used to compute the communication RTT, and accordingly limit the communication rate
+ double sharing_penalty_ = {};
+
+ s4u::Host& get_src() const { return src_; }
+ s4u::Host& get_dst() const { return dst_; }
+};
+
+/* Insert link(s) at the end of vector `result' (at the beginning, and reversed, for insert_link_latency()), and add
+ * link->get_latency() to *latency when latency is not null
+ */
+void add_link_latency(std::vector<StandardLinkImpl*>& result, StandardLinkImpl* link, double* latency);
+void add_link_latency(std::vector<StandardLinkImpl*>& result, const std::vector<StandardLinkImpl*>& links,
+ double* latency);
+void insert_link_latency(std::vector<StandardLinkImpl*>& result, const std::vector<StandardLinkImpl*>& links,
+ double* latency);
+
+} // namespace resource
+} // namespace kernel
+} // namespace simgrid
+
+#endif /* SIMGRID_KERNEL_RESOURCE_LINKIMPL_HPP */
