// The monitor has a virtual interface handle with which
// it can monitor the events happening on the interface.
// It sees new transactions and then captures information
// into a packet and sends it to the scoreboard
// using another mailbox.
class monitor extends uvm_monitor;
  `uvm_component_utils(monitor)
  function new(string name = "monitor", uvm_component parent = null);
    super.new(name, parent);
  endfunction

  uvm_analysis_port #(Item) mon_analysis_port;

  virtual des_if vif;

  virtual function void build_phase(uvm_phase phase);
    super.build_phase(phase);

    if (!uvm_config_db#(virtual des_if)::get(this, "", "des_vif", vif))
      `uvm_fatal("MON", "Could not get vif")

    mon_analysis_port = new("mon_analysis_port", this);
  endfunction

  virtual task run_phase(uvm_phase phase);
    super.run_phase(phase);

    // This task monitors the interface for a complete
    // transaction and writes into analysis port when complete
    forever begin
      @(vif.cb);
      if (!vif.reset) begin
        Item item = Item::type_id::create("item");

        item.inp  = vif.inp;
        item.outp = vif.cb.outp;

        mon_analysis_port.write(item);

        `uvm_info("MON", $sformatf("Saw item %s", item.convert2str()), UVM_HIGH)
      end
    end
  endtask
endclass