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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.persistence;
import com.yahoo.component.Version;
import com.yahoo.config.provision.HostName;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.vespa.hosted.controller.versions.NodeVersion;
import java.util.ArrayList;
import java.util.List;
/**
* Serializer for {@link com.yahoo.vespa.hosted.controller.versions.NodeVersion}.
*
* @author mpolden
*/
public class NodeVersionSerializer {
// 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 hostnameField = "hostname";
private static final String zoneField = "zone";
private static final String wantedVersionField = "wantedVersion";
private static final String suspendedAtField = "suspendedAt";
public void nodeVersionsToSlime(List<NodeVersion> nodeVersions, Cursor array) {
for (var nodeVersion : nodeVersions) {
var nodeVersionObject = array.addObject();
nodeVersionObject.setString(hostnameField, nodeVersion.hostname().value());
nodeVersionObject.setString(zoneField, nodeVersion.zone().value());
nodeVersionObject.setString(wantedVersionField, nodeVersion.wantedVersion().toFullString());
nodeVersion.suspendedAt().ifPresent(suspendedAt -> nodeVersionObject.setLong(suspendedAtField,
suspendedAt.toEpochMilli()));
}
}
public List<NodeVersion> nodeVersionsFromSlime(Inspector array, Version version) {
List<NodeVersion> nodeVersions = new ArrayList<>();
array.traverse((ArrayTraverser) (i, entry) -> {
var hostname = HostName.from(entry.field(hostnameField).asString());
var zone = ZoneId.from(entry.field(zoneField).asString());
var wantedVersion = Version.fromString(entry.field(wantedVersionField).asString());
var suspendedAt = SlimeUtils.optionalInstant(entry.field(suspendedAtField));
nodeVersions.add(new NodeVersion(hostname, zone, version, wantedVersion, suspendedAt));
});
return nodeVersions;
}
}
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