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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision;
import com.google.inject.Inject;
import com.yahoo.config.provisioning.FlavorsConfig;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
/**
* All the flavors *configured* in this zone (i.e this should be called HostFlavors).
*
* @author bratseth
*/
public class NodeFlavors {
/** Flavors which are configured in this zone */
private final Map<String, Flavor> configuredFlavors;
@Inject
public NodeFlavors(FlavorsConfig config) {
HashMap<String, Flavor> b = new HashMap<>();
for (Flavor flavor : toFlavors(config))
b.put(flavor.name(), flavor);
this.configuredFlavors = Collections.unmodifiableMap(b);
}
public List<Flavor> getFlavors() {
return new ArrayList<>(configuredFlavors.values());
}
/** Returns a flavor by name, or empty if there is no flavor with this name and it cannot be created on the fly. */
public Optional<Flavor> getFlavor(String name) {
if (configuredFlavors.containsKey(name))
return Optional.of(configuredFlavors.get(name));
NodeResources nodeResources = NodeResources.fromLegacyName(name);
if (nodeResources.allocateByLegacyName())
return Optional.empty();
else
return Optional.of(new Flavor(nodeResources));
}
/**
* Returns the flavor with the given name or throws an IllegalArgumentException if it does not exist
* and cannot be created on the fly.
*/
public Flavor getFlavorOrThrow(String flavorName) {
return getFlavor(flavorName).orElseThrow(() -> new IllegalArgumentException("Unknown flavor '" + flavorName +
"'. Flavors are " + canonicalFlavorNames()));
}
/** Returns true if this flavor is configured or can be created on the fly */
public boolean exists(String flavorName) {
return getFlavor(flavorName).isPresent();
}
private List<String> canonicalFlavorNames() {
return configuredFlavors.values().stream().map(Flavor::canonicalName).distinct().sorted().collect(Collectors.toList());
}
private static Collection<Flavor> toFlavors(FlavorsConfig config) {
Map<String, Flavor> flavors = new HashMap<>();
// First pass, create all flavors, but do not include flavorReplacesConfig.
for (FlavorsConfig.Flavor flavorConfig : config.flavor()) {
flavors.put(flavorConfig.name(), new Flavor(flavorConfig));
}
// Second pass, set flavorReplacesConfig to point to correct flavor.
for (FlavorsConfig.Flavor flavorConfig : config.flavor()) {
Flavor flavor = flavors.get(flavorConfig.name());
for (FlavorsConfig.Flavor.Replaces flavorReplacesConfig : flavorConfig.replaces()) {
if (! flavors.containsKey(flavorReplacesConfig.name())) {
throw new IllegalStateException("Replaces for " + flavor.name() +
" pointing to a non existing flavor: " + flavorReplacesConfig.name());
}
flavor.replaces().add(flavors.get(flavorReplacesConfig.name()));
}
flavor.freeze();
}
// Third pass, ensure that retired flavors have a replacement
for (Flavor flavor : flavors.values()) {
if (flavor.isRetired() && !hasReplacement(flavors.values(), flavor)) {
throw new IllegalStateException(
String.format("Flavor '%s' is retired, but has no replacement", flavor.name())
);
}
}
return flavors.values();
}
private static boolean hasReplacement(Collection<Flavor> flavors, Flavor flavor) {
return flavors.stream()
.filter(f -> !f.equals(flavor))
.anyMatch(f -> f.satisfies(flavor));
}
}
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