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/*
 * Copyright  2020 The BtrPlace Authors. All rights reserved.
 * Use of this source code is governed by a LGPL-style
 * license that can be found in the LICENSE.txt file.
 */

package org.btrplace.scheduler.choco.transition;

import org.btrplace.model.VM;
import org.btrplace.model.VMState;
import org.btrplace.plan.ReconfigurationPlan;
import org.btrplace.scheduler.SchedulerException;
import org.btrplace.scheduler.SchedulerModelingException;
import org.btrplace.scheduler.choco.ReconfigurationProblem;
import org.btrplace.scheduler.choco.Slice;
import org.btrplace.scheduler.choco.extensions.TaskMonitor;
import org.chocosolver.solver.Model;
import org.chocosolver.solver.Solution;
import org.chocosolver.solver.variables.BoolVar;
import org.chocosolver.solver.variables.IntVar;


/**
 * Model a transition that will forge a VM to put it into the ready state.
 * 

* The VM must have an attribute (provided by {@link org.btrplace.model.Model#getAttributes()} * {@code template} that indicate the template identifier to use to build the VM image. *

* An estimation of the action duration must be provided through a * {@link org.btrplace.scheduler.choco.duration.ActionDurationEvaluator} accessible from * {@link org.btrplace.scheduler.choco.ReconfigurationProblem#getDurationEvaluators()} with the key {@code ForgeVM.class} *

* If the reconfiguration problem has a solution, a {@link org.btrplace.plan.event.ForgeVM} action * will inserted into the resulting reconfiguration plan. * * @author Fabien Hermenier */ public class ForgeVM implements VMTransition { /** * The prefix to use for the variables */ public static final String VAR_PREFIX = "forge"; private final VM vm; private final IntVar duration; private final BoolVar state; private final String template; private final IntVar start; private final IntVar end; /** * Make a new model. * * @param rp the RP to use as a basis. * @param e the VM managed by the action * @throws SchedulerModelingException if an error occurred */ public ForgeVM(ReconfigurationProblem rp, VM e) throws SchedulerModelingException { int d = rp.getDurationEvaluators().evaluate(rp.getSourceModel(), org.btrplace.plan.event.ForgeVM.class, e); template = rp.getSourceModel().getAttributes().get(e, "template", ""); if ("".equals(template)) { throw new SchedulerModelingException(rp.getSourceModel(), "Unable to forge the VM '" + e + "'. The required attribute 'template' is missing from the model"); } Model csp = rp.getModel(); duration = csp.intVar(d); state = csp.boolVar(false); vm = e; /* * We don't make any "real" d-slice cause it may impacts the TaskScheduler * so the hosting variable is set to -1 to be sure the VM is not hosted on a node */ start = rp.makeUnboundedDuration(VAR_PREFIX, "(", e, ").start"); end = rp.makeUnboundedDuration(VAR_PREFIX, "(", e, ").stop"); TaskMonitor.build(start, duration, end); csp.post(csp.arithm(duration, ">=", d)); csp.post(csp.arithm(end, "<=", rp.getEnd())); } @Override public boolean insertActions(Solution s, ReconfigurationPlan plan) { org.btrplace.plan.event.ForgeVM a = new org.btrplace.plan.event.ForgeVM(vm, s.getIntVal(getStart()), s.getIntVal(getEnd())); return plan.add(a); } @Override public VM getVM() { return vm; } @Override public IntVar getStart() { return start; } @Override public IntVar getEnd() { return end; } @Override public IntVar getDuration() { return duration; } @Override public Slice getCSlice() { return null; } @Override public Slice getDSlice() { return null; } @Override public BoolVar getState() { return state; } @Override public boolean isManaged() { return true; } @Override public VMState getSourceState() { return VMState.INIT; } @Override public VMState getFutureState() { return VMState.READY; } /** * Get the template to use to build the VM. * * @return the template identifier */ public String getTemplate() { return template; } /** * The builder devoted to a init -> ready transition. */ public static class Builder extends VMTransitionBuilder { /** * New builder */ public Builder() { super("forge", VMState.INIT, VMState.READY); } @Override public VMTransition build(ReconfigurationProblem r, VM v) throws SchedulerException { return new ForgeVM(r, v); } } }





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