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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision.zone;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/**
* This class declares the steps (zones) to follow when upgrading a system. If a step contains multiple zones, those
* will be upgraded in parallel.
*
* @author mpolden
*/
public class UpgradePolicy {
private final List<Set<ZoneApi>> steps;
private UpgradePolicy(List<Set<ZoneApi>> steps) {
for (int i = 0; i < steps.size(); i++) {
for (int j = 0; j < i; j++) {
if (!Collections.disjoint(steps.get(i), steps.get(j))) {
throw new IllegalArgumentException("One or more zones are declared in multiple steps");
}
}
}
this.steps = List.copyOf(steps);
}
/** Returns the steps in this */
public List<Set<ZoneApi>> steps() {
return steps;
}
/** Returns a copy of this with the step order inverted */
public UpgradePolicy inverted() {
List<Set<ZoneApi>> copy = new ArrayList<>(steps);
Collections.reverse(copy);
return new UpgradePolicy(copy);
}
public static UpgradePolicy.Builder builder() {
return new UpgradePolicy.Builder();
}
public static class Builder {
private final List<Set<ZoneApi>> steps = new ArrayList<>();
private Builder() {}
/** Upgrade given zone as the next step */
public Builder upgrade(ZoneApi zone) {
return upgradeInParallel(zone);
}
/** Upgrade given zones in parallel as the next step */
public Builder upgradeInParallel(ZoneApi... zone) {
this.steps.add(Set.of(zone));
return this;
}
public UpgradePolicy build() {
return new UpgradePolicy(steps);
}
}
}
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