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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.Objects;
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 record UpgradePolicy(List<Step> steps) {
public UpgradePolicy(List<Step> steps) {
Objects.requireNonNull(steps);
for (int i = 0; i < steps.size(); i++) {
for (int j = 0; j < i; j++) {
if (!Collections.disjoint(steps.get(i).zones(), steps.get(j).zones())) {
throw new IllegalArgumentException("One or more zones are declared in multiple steps");
}
}
}
this.steps = List.copyOf(steps);
}
/** Returns a copy of this with the step order inverted */
public UpgradePolicy inverted() {
List<Step> copy = new ArrayList<>(steps);
Collections.reverse(copy);
return new UpgradePolicy(copy);
}
public static UpgradePolicy.Builder builder() {
return new UpgradePolicy.Builder();
}
public record Builder(List<Step> steps) {
private Builder() {
this(new ArrayList<>());
}
public Builder upgrade(Step step) {
this.steps.add(step);
return this;
}
public Builder upgrade(ZoneApi zone) {
return upgradeInParallel(zone);
}
public Builder upgradeInParallel(ZoneApi... zone) {
return upgrade(Step.of(zone));
}
public UpgradePolicy build() {
return new UpgradePolicy(steps);
}
}
/**
* An upgrade step, consisting of one or more zones. If a step contains multiple zones, those will be upgraded in
* parallel.
*/
public record Step(Set<ZoneApi> zones, NodeSlice nodeSlice) {
public Step(Set<ZoneApi> zones, NodeSlice nodeSlice) {
if (zones.isEmpty()) throw new IllegalArgumentException("A step must contain at least one zone");
this.zones = Set.copyOf(Objects.requireNonNull(zones));
this.nodeSlice = Objects.requireNonNull(nodeSlice);
}
/** Create a step for given zones, which requires all nodes to complete upgrade */
public static Step of(ZoneApi... zone) {
return new Step(Set.of(zone), NodeSlice.ALL);
}
/** Returns a copy of this step, requiring only the given slice of nodes for each zone in this step to upgrade */
public Step require(NodeSlice slice) {
return new Step(zones, slice);
}
}
}
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