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// Copyright 2019 Oath Inc. 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.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.vespa.hosted.controller.versions.NodeVersion;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
/**
* 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 currentVersionField = "currentVersion";
private static final String wantedVersionField = "wantedVersion";
private static final String changedAtField = "changedAt";
public void nodeVersionsToSlime(Collection<NodeVersion> nodeVersions, Cursor array, boolean writeCurrentVersion) {
for (var nodeVersion : nodeVersions) {
var nodeVersionObject = array.addObject();
nodeVersionObject.setString(hostnameField, nodeVersion.hostname().value());
if (writeCurrentVersion) {
nodeVersionObject.setString(currentVersionField, nodeVersion.currentVersion().toFullString());
}
nodeVersionObject.setString(wantedVersionField, nodeVersion.wantedVersion().toFullString());
nodeVersionObject.setLong(changedAtField, nodeVersion.changedAt().toEpochMilli());
}
}
public List<NodeVersion> nodeVersionsFromSlime(Inspector object, Optional<Version> version) {
var nodeVersions = new ArrayList<NodeVersion>();
object.traverse((ArrayTraverser) (i, entry) -> {
var hostname = HostName.from(entry.field(hostnameField).asString());
var currentVersion = version.orElseGet(() -> Version.fromString(entry.field(currentVersionField).asString()));
var wantedVersion = Version.fromString(entry.field(wantedVersionField).asString());
var changedAt = Instant.ofEpochMilli(entry.field(changedAtField).asLong());
nodeVersions.add(new NodeVersion(hostname, currentVersion, wantedVersion, changedAt));
});
return Collections.unmodifiableList(nodeVersions);
}
}
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