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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision;
import com.google.common.collect.ImmutableList;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.NodeType;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import static java.util.stream.Collectors.collectingAndThen;
/**
* A filterable node list
*
* @author bratseth
* @author mpolden
*/
public class NodeList implements Iterable<Node> {
private final List<Node> nodes;
public NodeList(List<Node> nodes) {
this(nodes, true);
}
private NodeList(List<Node> nodes, boolean copy) {
this.nodes = copy ? ImmutableList.copyOf(nodes) : Collections.unmodifiableList(nodes);
}
/** Returns the subset of nodes which are retired */
public NodeList retired() {
return filter(node -> node.allocation().get().membership().retired());
}
/** Returns the subset of nodes which are not retired */
public NodeList nonretired() {
return filter(node -> ! node.allocation().get().membership().retired());
}
/** Returns the subset of nodes of the given flavor */
public NodeList flavor(String flavor) {
return filter(node -> node.flavor().name().equals(flavor));
}
/** Returns the subset of nodes which does not have the given flavor */
public NodeList notFlavor(String flavor) {
return filter(node -> ! node.flavor().name().equals(flavor));
}
/** Returns the subset of nodes assigned to the given cluster type */
public NodeList type(ClusterSpec.Type type) {
return filter(node -> node.allocation().get().membership().cluster().type().equals(type));
}
/** Returns the subset of nodes owned by the given application */
public NodeList owner(ApplicationId application) {
return filter(node -> node.allocation().map(a -> a.owner().equals(application)).orElse(false));
}
/** Returns the subset of nodes matching the given node type */
public NodeList nodeType(NodeType nodeType) {
return filter(node -> node.type() == nodeType);
}
/** Returns the subset of nodes that are parents */
public NodeList parents() {
return filter(n -> n.parentHostname().isEmpty());
}
/** Returns the child nodes of the given parent node */
public NodeList childrenOf(String hostname) {
return filter(n -> n.parentHostname().map(hostname::equals).orElse(false));
}
public NodeList childrenOf(Node parent) {
return childrenOf(parent.hostname());
}
/** Returns the subset of nodes that are in a given state */
public NodeList state(Node.State state) {
return filter(node -> node.state() == state);
}
/** Returns the parent nodes of the given child nodes */
public NodeList parentsOf(Collection<Node> children) {
return children.stream()
.map(this::parentOf)
.filter(Optional::isPresent)
.flatMap(Optional::stream)
.collect(collectingAndThen(Collectors.toList(), NodeList::wrap));
}
/** Returns the parent node of the given child node */
public Optional<Node> parentOf(Node child) {
return child.parentHostname()
.flatMap(parentHostname -> nodes.stream()
.filter(node -> node.hostname().equals(parentHostname))
.findFirst());
}
public int size() { return nodes.size(); }
/** Returns the immutable list of nodes in this */
public List<Node> asList() { return nodes; }
private NodeList filter(Predicate<Node> predicate) {
return nodes.stream().filter(predicate).collect(collectingAndThen(Collectors.toList(), NodeList::wrap));
}
@Override
public Iterator<Node> iterator() {
return nodes.iterator();
}
private static NodeList wrap(List<Node> nodes) {
return new NodeList(nodes, false);
}
}
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