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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 java.util.List;
/**
* The possible types of nodes in the node repository
*
* @author bratseth
*/
public enum NodeType {
/** Node assignable to a tenant to run application workloads */
tenant("Tenant node"),
/** Host of a tenant nodes */
host("Tenant host", tenant),
/** Node serving the shared proxy layer */
proxy("Proxy node"),
/** Host of a proxy node */
proxyhost("Proxy host", proxy),
/** Config server node */
config("Config server node"),
/** Host of a config server node */
confighost("Config server host", config),
/** Controller node */
controller("Controller node"),
/** Host of a controller node */
controllerhost("Controller host", controller);
private final String description;
private final List<NodeType> childNodeTypes;
NodeType(String description, NodeType... childNodeTypes) {
this.childNodeTypes = List.of(childNodeTypes);
this.description = description;
}
public boolean isHost() {
return !childNodeTypes.isEmpty();
}
/** either config server or controller */
public boolean isConfigServerLike() {
return this == config || this == controller;
}
/** either config server host or controller host */
public boolean isConfigServerHostLike() {
return this == confighost || this == controllerhost;
}
/** Returns whether this supports host sharing */
public boolean isSharable() {
return this == NodeType.host;
}
public String description() {
return description;
}
/**
* @return {@link NodeType} of the node(s) that run on this host
* @throws IllegalStateException if this type is not a host
*/
public NodeType childNodeType() {
return childNodeTypes().get(0);
}
/**
* @return all {@link NodeType}s that can run on this host
* @throws IllegalStateException if this type is not a host
*/
public List<NodeType> childNodeTypes() {
if (! isHost())
throw new IllegalStateException(this + " has no children");
return childNodeTypes;
}
/** Returns whether given node type can run on this */
public boolean canRun(NodeType type) {
return childNodeTypes.contains(type);
}
/** Returns the parent host type. */
public NodeType parentNodeType() {
for (var type : values()) {
if (type.childNodeTypes.contains(this)) return type;
}
throw new IllegalStateException(this + " has no parent");
}
/** Returns the host type of this */
public NodeType hostType() {
if (isHost()) return this;
for (NodeType nodeType : values()) {
// Ignore host types that support multiple node types
if (nodeType.childNodeTypes.size() == 1 && nodeType.canRun(this)) {
return nodeType;
}
}
throw new IllegalStateException("No host of " + this + " exists");
}
}
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