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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.config.provision;
import com.yahoo.component.Version;
import java.util.Objects;
import java.util.Optional;
/**
* A node's membership in a cluster. This is a value object.
* The format is "clusterType/clusterId/groupId/index[/exclusive][/retired][/stateful][/combinedId]"
*
* @author bratseth
*/
public class ClusterMembership {
private final ClusterSpec cluster;
private final int index;
private final boolean retired;
private final String stringValue;
private ClusterMembership(String stringValue, Version vespaVersion, Optional dockerImageRepo,
ZoneEndpoint zoneEndpoint) {
String[] components = stringValue.split("/");
if (components.length < 3)
throw new RuntimeException("Could not parse '" + stringValue + "' to a cluster membership. " +
"Expected 'clusterType/clusterId/groupId/index[/retired][/exclusive][/stateful][/combinedId]'");
Integer groupIndex = components[2].isEmpty() ? null : Integer.parseInt(components[2]);
Integer nodeIndex;
int missingElements = 0;
try {
nodeIndex = Integer.parseInt(components[3]);
} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
// Legacy form missing the group component
nodeIndex = groupIndex;
groupIndex = null;
missingElements = 1;
}
boolean exclusive = false;
boolean stateful = false;
var combinedId = Optional.empty();
boolean retired = false;
if (components.length > (4 - missingElements)) {
for (int i = (4 - missingElements); i < components.length; i++) {
String component = components[i];
switch (component) {
case "exclusive" -> exclusive = true;
case "retired" -> retired = true;
case "stateful" -> stateful = true;
default -> combinedId = Optional.of(component);
}
}
}
this.cluster = ClusterSpec.specification(ClusterSpec.Type.valueOf(components[0]),
ClusterSpec.Id.from(components[1]))
.group(groupIndex == null ? null : ClusterSpec.Group.from(groupIndex))
.vespaVersion(vespaVersion)
.exclusive(exclusive)
.combinedId(combinedId.map(ClusterSpec.Id::from))
.dockerImageRepository(dockerImageRepo)
.loadBalancerSettings(zoneEndpoint)
.stateful(stateful)
.build();
this.index = nodeIndex;
this.retired = retired;
this.stringValue = toStringValue();
}
private ClusterMembership(ClusterSpec cluster, int index, boolean retired) {
this.cluster = cluster;
this.index = index;
this.retired = retired;
this.stringValue = toStringValue();
}
protected String toStringValue() {
return cluster.type().name() +
"/" + cluster.id().value() +
(cluster.group().isPresent() ? "/" + cluster.group().get().index() : "/") +
"/" + index +
( cluster.isExclusive() ? "/exclusive" : "") +
( retired ? "/retired" : "") +
( cluster.isStateful() ? "/stateful" : "") +
( cluster.combinedId().isPresent() ? "/" + cluster.combinedId().get().value() : "");
}
/** Returns the cluster this node is a member of */
public ClusterSpec cluster() { return cluster; }
/** Returns the index of this node within the cluster */
public int index() { return index; }
/** Returns whether the cluster should prepare for this node to be removed */
public boolean retired() { return retired; }
/** Returns a copy of this which is retired */
public ClusterMembership retire() {
return new ClusterMembership(cluster, index, true);
}
/** Returns a copy of this node which is not retired */
public ClusterMembership unretire() {
return new ClusterMembership(cluster, index, false);
}
public ClusterMembership with(ClusterSpec newCluster) {
return new ClusterMembership(newCluster, index, retired);
}
/**
* Returns all the information in this as a string which can be used to construct the same ClusterMembership
* instance using {@link #from}. This string is currently stored in ZooKeeper on running instances.
*/
public String stringValue() { return stringValue; }
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ClusterMembership that = (ClusterMembership) o;
return index == that.index &&
retired == that.retired &&
cluster.equals(that.cluster) &&
stringValue.equals(that.stringValue);
}
@Override
public int hashCode() {
return Objects.hash(cluster, index, retired, stringValue);
}
@Override
public String toString() { return stringValue(); }
public static ClusterMembership from(String stringValue, Version vespaVersion, Optional dockerImageRepo) {
return from(stringValue, vespaVersion, dockerImageRepo, ZoneEndpoint.defaultEndpoint);
}
public static ClusterMembership from(String stringValue, Version vespaVersion, Optional dockerImageRepo,
ZoneEndpoint zoneEndpoint) {
return new ClusterMembership(stringValue, vespaVersion, dockerImageRepo, zoneEndpoint);
}
public static ClusterMembership from(ClusterSpec cluster, int index) {
return new ClusterMembership(cluster, index, false);
}
public static ClusterMembership retiredFrom(ClusterSpec cluster, int index) {
return new ClusterMembership(cluster, index, true);
}
}
