package org.ovirt.engine.core.bll.scheduling.policyunits;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.ovirt.engine.core.bll.scheduling.PolicyUnitImpl;
import org.ovirt.engine.core.bll.scheduling.SchedulingUnit;
import org.ovirt.engine.core.bll.scheduling.pending.PendingResourceManager;
import org.ovirt.engine.core.common.businessentities.Cluster;
import org.ovirt.engine.core.common.businessentities.VDS;
import org.ovirt.engine.core.common.businessentities.VM;
import org.ovirt.engine.core.common.scheduling.PolicyUnit;
import org.ovirt.engine.core.common.scheduling.PolicyUnitType;
import org.ovirt.engine.core.common.utils.Pair;
import org.ovirt.engine.core.compat.Guid;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@SchedulingUnit(
guid = "591cdb81-ba67-45b4-9642-e28f61a97d57",
name = "PreferredHosts",
description = "Prioritize preferred hosts during VM startup.",
type = PolicyUnitType.WEIGHT
)
public class PreferredHostsWeightPolicyUnit extends PolicyUnitImpl {
private static final Logger log = LoggerFactory.getLogger(PreferredHostsWeightPolicyUnit.class);
public PreferredHostsWeightPolicyUnit(PolicyUnit policyUnit, PendingResourceManager pendingResourceManager) {
super(policyUnit, pendingResourceManager);
}
@Override
public List<Pair<Guid, Integer>> score(Cluster cluster, List<VDS> hosts, VM vm, Map<String, String> parameters) {
// Preferred hosts are only used during VM startup
if (!vm.isDown()) {
return Collections.emptyList();
}
List<Pair<Guid, Integer>> weights = new ArrayList<>();
Set<Guid> preferredHosts = new HashSet<>(vm.getDedicatedVmForVdsList());
// Add penalization to hosts that are not in the preferred list
for (VDS host: hosts) {
if (!preferredHosts.contains(host.getId())) {
log.info("Penalizing host '{}' because it is not preferred.", host.getName());
weights.add(new Pair<Guid, Integer>(host.getId(), 10000)); // TODO externalize weight
} else {
weights.add(new Pair<Guid, Integer>(host.getId(), 0));
}
}
return weights;
}
}