Examples of umontreal.iro.lecuyer.simevents.Event

umontreal.iro.lecuyer.simevents.Event

This abstract class provides event scheduling tools. Each type of event should be defined as a subclass of the class Event, and should provide an implementation of the method {@link #actions actions} which is executed when an event of this type occurs.The instances of these subclasses are the actual events.

Each event is linked to a simulator represented by an instance of {@link Simulator} before it can be scheduled and processed.A default simulator, given by Simulator.getDefaultSimulator, is used if no simulator is linked explicitly with an event. When an event is constructed, it is not scheduled. It must be scheduled separately by calling one of the scheduling methods {@link #schedule schedule}, {@link #scheduleNext scheduleNext}, {@link #scheduleBefore scheduleBefore}, etc. An event can also be cancelled before it occurs.

A scheduled event has an associated time at which it will happen and a priority, which can be queried using the methods {@link #time time} and {@link #priority priority}, respectively. By default, events occur in ascending order of time, and have priority 1. Events with the same time occur in ascending order of priority. For example, if events e1 and e2 occur at the same time with priority 2 and 1 respectively, then e2 will occur before e1. Events with the same time and priority occur in the order they were scheduled.

      public Event previous() {
         if(!hasPrevious())
            throw new NoSuchElementException();


         nextIndex--;
         Event ev = prev.event;
         lastRet = prev;
         prev = prev.left;
         next = next.left;
         return ev;
      }

    // This method looks for the next process to give it the control.
    // If there are some event in the eventList, they will be executed
    // This method doesn't reactivate the executive.
    // Its behavior is the same of the executive (see the Sim.start method)
   protected void dispatch() {
      Event ev;
      while ((ev = removeFirstEvent()) != null) {
         if (ev instanceof SimThread) {
            // This is a process, the control will transfered to it.
            currentProcess = ((SimThread)ev).myProcess;
            ((SimThread)ev).activate();
            return;
         }
         else ev.actions();
         // This event is executed by the calling process.
      }
      SimThread.simActivate(this);                     // Simulation is over.
   }

Examples of umontreal.iro.lecuyer.simevents.Event

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