org.btrplace.plan.DependencyBasedPlanApplier Maven / Gradle / Ivy
/*
* 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.plan;
import org.btrplace.model.Model;
import org.btrplace.plan.event.Action;
import java.util.HashSet;
import java.util.Set;
/**
* A plan applier that relies on the dependencies between the actions composing the plan.
* Only unblocked actions are executed. Once executed, the unblocked actions are executed.
*
* This process is repeated until all the actions are executed. This process is ensure to finish
* iff their is no cyclic dependencies.
*
* @author Fabien Hermenier
*/
public class DependencyBasedPlanApplier extends DefaultPlanApplier {
@Override
public Model apply(ReconfigurationPlan p) {
int nbCommitted = 0;
ReconfigurationPlanMonitor rpm = new DefaultReconfigurationPlanMonitor(p);
Set feasible = new HashSet<>();
for (Action a : p.getActions()) {
if (!rpm.isBlocked(a)) {
feasible.add(a);
}
}
while (nbCommitted != p.getSize()) {
Set newFeasible = new HashSet<>();
for (Action a : feasible) {
Set s = rpm.commit(a);
fireAction(a);
newFeasible.addAll(s);
nbCommitted++;
}
feasible = newFeasible;
}
return rpm.getCurrentModel();
}
@Override
public String toString(ReconfigurationPlan p) {
StringBuilder b = new StringBuilder();
for (Action a : p) {
b.append(String.format("%s -> %s%n", p.getDirectDependencies(a), a));
}
return b.toString();
}
}