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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.CloudName;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.versions.OsVersion;
import java.util.Collections;
import java.util.Set;
import java.util.TreeSet;
/**
* Serializer for an {@link OsVersion}.
*
* @author mpolden
*/
public class OsVersionSerializer {
// 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 versionsField = "versions";
private static final String versionField = "version";
private static final String cloudField = "cloud";
public Slime toSlime(Set<OsVersion> osVersions) {
Slime slime = new Slime();
Cursor root = slime.setObject();
Cursor array = root.setArray(versionsField);
osVersions.forEach(osVersion -> toSlime(osVersion, array.addObject()));
return slime;
}
public void toSlime(OsVersion osVersion, Cursor object) {
object.setString(versionField, osVersion.version().toFullString());
object.setString(cloudField, osVersion.cloud().value());
}
public Set<OsVersion> fromSlime(Slime slime) {
Inspector array = slime.get().field(versionsField);
Set<OsVersion> osVersions = new TreeSet<>();
array.traverse((ArrayTraverser) (i, inspector) -> osVersions.add(fromSlime(inspector)));
return Collections.unmodifiableSet(osVersions);
}
public OsVersion fromSlime(Inspector object) {
return new OsVersion(
Version.fromString(object.field(versionField).asString()),
CloudName.from(object.field(cloudField).asString())
);
}
}
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