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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.persistence;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.routing.ZoneRoutingPolicy;
import java.util.Objects;
/**
* Serializer for {@link ZoneRoutingPolicy}.
*
* @author mpolden
*/
public class ZoneRoutingPolicySerializer {
// WARNING: Since there are multiple servers in a ZooKeeper cluster and they upgrade one by one
// (and rewrite all nodes on startup), changes to the serialized format must be made
// such that what is serialized on version N+1 can be read by version N:
// - ADDING FIELDS: Always ok
// - REMOVING FIELDS: Stop reading the field first. Stop writing it on a later version.
// - CHANGING THE FORMAT OF A FIELD: Don't do it bro.
private static final String GLOBAL_ROUTING_FIELD = "globalRouting";
private final RoutingPolicySerializer routingPolicySerializer;
public ZoneRoutingPolicySerializer(RoutingPolicySerializer routingPolicySerializer) {
this.routingPolicySerializer = Objects.requireNonNull(routingPolicySerializer, "routingPolicySerializer must be non-null");
}
public ZoneRoutingPolicy fromSlime(ZoneId zone, Slime slime) {
var root = slime.get();
return new ZoneRoutingPolicy(zone, routingPolicySerializer.routingStatusFromSlime(root.field(GLOBAL_ROUTING_FIELD)));
}
public Slime toSlime(ZoneRoutingPolicy policy) {
var slime = new Slime();
var root = slime.setObject();
routingPolicySerializer.globalRoutingToSlime(policy.routingStatus(), root.setObject(GLOBAL_ROUTING_FIELD));
return slime;
}
}
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