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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.vespa.hosted.controller.api.integration.dns;
import ai.vespa.http.DomainName;
import java.util.Objects;
/**
* An implementation of {@link AliasTarget} where is requests are answered based on the weight assigned to the
* record, as a proportion of the total weight for all records having the same DNS name.
* <p>
* The portion of received traffic is calculated as follows: (record weight / sum of the weights of all records).
*
* @author mpolden
*/
public final class WeightedAliasTarget extends AliasTarget {
static final String TARGET_TYPE = "weighted";
private final long weight;
public WeightedAliasTarget(DomainName name, String dnsZone, String id, long weight) {
super(name, dnsZone, id);
this.weight = weight;
if (weight < 0) throw new IllegalArgumentException("Weight cannot be negative");
}
/** The weight of this target */
public long weight() {
return weight;
}
@Override
public RecordData pack() {
return RecordData.from(String.join("/", TARGET_TYPE, name().value(), dnsZone(), id(), Long.toString(weight)));
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
WeightedAliasTarget that = (WeightedAliasTarget) o;
return weight == that.weight;
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), weight);
}
@Override
public String toString() {
return "weighted target for " + name() + "[id=" + id() + ",dnsZone=" + dnsZone() + ",weight=" + weight + "]";
}
/** Unpack weighted alias from given record data */
public static WeightedAliasTarget unpack(RecordData data) {
var parts = data.asString().split("/");
if (parts.length != 5) {
throw new IllegalArgumentException("Expected data to be on format type/name/DNS-zone/zone-id/weight, " +
"but got " + data.asString());
}
if (!TARGET_TYPE.equals(parts[0])) {
throw new IllegalArgumentException("Unexpected type '" + parts[0] + "'");
}
return new WeightedAliasTarget(DomainName.of(parts[1]), parts[2], parts[3], Long.parseLong(parts[4]));
}
}
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