@Override
public IntVar intVar() {
if (me == null) {
IntVar v = e.intVar();
switch (op) {
case NEG:
me = model.intMinusView(v);
break;
case ABS:
me = model.intAbsView(v);
break;
case SQR:
int[] bounds = VariableUtils.boundsForMultiplication(v, v);
me = model.intVar(model.generateName("sqr_exp_"), bounds[0], bounds[1]);
model.times(v, v, me).post();
break;
default:
throw new UnsupportedOperationException(
"Unary arithmetic expressions does not support " + op.name());
}
}
return me;
}
/**
* Make a new model.
*
* @param p the RP to use as a basis.
* @param e the VM managed by the action
* @throws org.btrplace.scheduler.SchedulerException if an error occurred
*/
public RelocatableVM(ReconfigurationProblem p, VM e) throws SchedulerException {
// Get vars
vm = e;
rp = p;
src = rp.getSourceModel().getMapping().getVMLocation(e);
org.chocosolver.solver.Model csp = rp.getModel();
Model mo = rp.getSourceModel();
// Default values
start = rp.getStart();
end = rp.getStart();
duration = csp.intVar(0);
state = csp.boolVar(true);
// If not manageable, the VM stays on the current host
if (!p.getManageableVMs().contains(e)) {
stay = csp.boolVar(true);
doReinstantiation = csp.boolVar(false);
manageable = false;
IntVar host = rp.makeCurrentHost(vm, PREFIX_STAY, vm, ").host");
cSlice =
new SliceBuilder(rp, vm, PREFIX_STAY, vm.toString(), ").cSlice")
.setHoster(host)
.setEnd(rp.makeUnboundedDuration(PREFIX_STAY, vm, ").cSlice_end"))
.build();
dSlice =
new SliceBuilder(rp, vm, PREFIX_STAY, vm, ").dSlice")
.setHoster(host)
.setStart(cSlice.getEnd())
.build();
return;
}
// The VM can move (to re-instantiate or migrate) OR STAY to the same host
stay = csp.boolVar(rp.makeVarLabel(vm, "stay"));
cSlice =
new SliceBuilder(rp, vm, PREFIX, vm, ").cSlice")
.setHoster(rp.getNode(rp.getSourceModel().getMapping().getVMLocation(vm)))
.setEnd(rp.makeUnboundedDuration(PREFIX, vm, ").cSlice_end"))
.build();
dSlice =
new SliceBuilder(rp, vm, PREFIX, vm, ").dSlice")
.setStart(rp.makeUnboundedDuration(PREFIX, vm, ").dSlice_start"))
.build();
// Update start and end vars of the action
start = dSlice.getStart();
end = cSlice.getEnd();
csp.post(new Arithmetic(end, Operator.LE, rp.getEnd()));
// Get some static durations from evaluators
DurationEvaluators dev = rp.getDurationEvaluators();
int migrateDuration = dev.evaluate(rp.getSourceModel(), MigrateVM.class, vm);
int bootDuration = dev.evaluate(rp.getSourceModel(), org.btrplace.plan.event.BootVM.class, vm);
int forgeD =
p.getDurationEvaluators()
.evaluate(p.getSourceModel(), org.btrplace.plan.event.ForgeVM.class, vm);
// Compute the re-instantiation duration
int reInstantiateDuration = bootDuration + forgeD;
reInstantiateDuration = forgeD; // Compliant with CMaxOnlineTest and others
// Get the networking view if attached
Network network = Network.get(mo);
IntVar migrationDuration;
if (network != null) {
// Set the migration algorithm
postCopy = mo.getAttributes().get(vm, "postCopy", false);
// Create unbounded/large domain vars for migration duration and bandwidth
migrationDuration = p.makeUnboundedDuration("migration(", vm, ").duration");
bandwidth = csp.intVar(PREFIX + vm + ").bandwidth", 0, Integer.MAX_VALUE / 100, true);
}
// No networking view, set the duration from the evaluator
else {
// The duration can still be 0 => the VM STAY !
migrationDuration =
csp.intVar(
rp.makeVarLabel("migration(", vm, ").duration"), new int[] {0, migrateDuration});
bandwidth = null;
}
// Possibly re-instantiate (if some attributes are defined)
if (mo.getAttributes().get(vm, "clone", false) && mo.getAttributes().isSet(vm, "template")) {
doReinstantiation = csp.boolVar(rp.makeVarLabel("relocation_method(", vm, ")"));
duration =
csp.intVar(
rp.makeVarLabel(PREFIX, vm, ").duration"),
Math.min(migrationDuration.getLB(), reInstantiateDuration),
Math.max(migrationDuration.getUB(), reInstantiateDuration),
true);
// Re-instantiate or migrate
// (Prefer the re-instantiation if the duration are the same, otherwise choose the min)
rp.getModel()
.ifThenElse(
rp.getModel()
.or(
new Arithmetic(
doReinstantiation, Operator.EQ, 0), // can be instantiated externally !
new Arithmetic(migrationDuration, Operator.LT, reInstantiateDuration)),
new Arithmetic(duration, Operator.EQ, migrationDuration),
new Arithmetic(duration, Operator.EQ, reInstantiateDuration));
// If it is a re-instantiation then specify that the dSlice must start AFTER the Forge delay
IntVar time =
csp.intVar(rp.makeVarLabel(doReinstantiation.getName(), " * ", forgeD), 0, forgeD, false);
csp.post(csp.times(doReinstantiation, forgeD, time));
csp.post(new Arithmetic(start, Operator.GE, time));
// Be sure that doReinstantiation will be instantiated
csp.post(new FastIFFEq(doReinstantiation, duration, reInstantiateDuration));
}
// The VM either migrate or stay but won't be re-instantiated for sure
else {
doReinstantiation = csp.boolVar(false);
duration = migrationDuration;
}
// If the VM stay (src host == dst host), then duration = 0
csp.post(new FastIFFEq(stay, dSlice.getHoster(), cSlice.getHoster().getValue()));
csp.post(new FastIFFEq(stay, duration, 0));
// We have to force the migration duration equals to 0 if it stays
// otherwise, the variable will be free
csp.post(new FastIFFEq(stay, migrationDuration, 0));
// Create the task ('default' cumulative constraint with a height of 1)
migrationTask = new Task(start, duration, end);
}