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/*
* MIT License
*
* Copyright (c) 2017 atlarge-research
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package nl.atlarge.opendc.topology.container
import mu.KotlinLogging
import nl.atlarge.opendc.topology.destinations
import nl.atlarge.opendc.kernel.Context
import nl.atlarge.opendc.kernel.Process
import nl.atlarge.opendc.kernel.time.Duration
import nl.atlarge.opendc.platform.scheduler.Scheduler
import nl.atlarge.opendc.platform.workload.Job
import nl.atlarge.opendc.platform.workload.Task
import nl.atlarge.opendc.topology.Entity
import nl.atlarge.opendc.topology.machine.Machine
import java.util.*
/**
* A representation of a facility used to house computer systems and associated components.
*
* @property scheduler The tasks scheduler the datacenter uses.
* @property interval The interval at which task will be (re)scheduled.
* @author Fabian Mastenbroek (f.s.mastenbroek@student.tudelft.nl)
*/
interface Datacenter : Entity<Unit>, Process<Datacenter> {
/**
* The task scheduler the datacenter uses.
*/
val scheduler: Scheduler
/**
* The interval at which task will be (re)scheduled.
*/
val interval: Duration
/**
* This method is invoked to start the simulation an [Entity] associated with this [Process].
*
* This method is assumed to be running during a simulation, but should hand back control to the simulator at
* some point by suspending the process. This allows other processes to do work in the current tick of the
* simulation.
* Suspending the process can be achieved by calling suspending method in the context:
* - [Context.tick] - Wait for the next tick to occur
* - [Context.wait] - Wait for `n` amount of ticks before resuming execution.
* - [Context.receive] - Wait for a message to be received in the mailbox of the [Entity] before resuming
* execution.
*
* If this method exits early, before the simulation has finished, the entity is assumed to be shutdown and its
* simulation will not run any further.
*/
suspend override fun Context<Datacenter>.run() {
val logger = KotlinLogging.logger {}
// The queue of messages to be processed after a cycle
val queue: Queue<Any> = ArrayDeque()
// Find all machines in the datacenter
val machines = outgoingEdges.destinations<Room>("room").asSequence()
.flatMap { it.outgoingEdges.destinations<Rack>("rack").asSequence() }
.flatMap { it.outgoingEdges.destinations<Machine>("machine").asSequence() }.toList()
logger.info { "Initialising datacenter with ${machines.size} machines" }
// Register all machines to the scheduler
machines.forEach(scheduler::register)
while (true) {
// Process all messages in the queue
while (queue.isNotEmpty()) {
val msg = queue.poll()
if (msg is Task) {
msg.arrive(time)
scheduler.submit(msg)
}
}
// (Re)schedule the tasks
scheduler.run { schedule() }
// Sleep a time quantum
wait(interval, queue)
}
}
}
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