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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.common.collect.ImmutableSet;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.config.SlimeUtils;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Optional;
import java.util.Set;
/**
* The hosts allocated to an application.
* This can be serialized to/from JSON.
* This is immutable.
*
* @author Ulf Lilleengen
* @author bratseth
*/
public class AllocatedHosts {
private static final String mappingKey = "mapping";
private static final String hostSpecKey = "hostSpec";
private static final String hostSpecHostName = "hostName";
private static final String hostSpecMembership = "membership";
private static final String hostSpecFlavor = "flavor";
private static final String hostSpecVespaVersion = "vespaVersion";
private final ImmutableSet<HostSpec> hosts;
AllocatedHosts(Set<HostSpec> hosts) {
this.hosts = ImmutableSet.copyOf(hosts);
}
public static AllocatedHosts withHosts(Set<HostSpec> hosts) {
return new AllocatedHosts(hosts);
}
private void toSlime(Cursor cursor) {
Cursor array = cursor.setArray(mappingKey);
for (HostSpec host : hosts)
toSlime(host, array.addObject().setObject(hostSpecKey));
}
private void toSlime(HostSpec host, Cursor cursor) {
cursor.setString(hostSpecHostName, host.hostname());
if (host.membership().isPresent()) {
cursor.setString(hostSpecMembership, host.membership().get().stringValue());
cursor.setString(hostSpecVespaVersion, host.membership().get().cluster().vespaVersion().toString());
}
if (host.flavor().isPresent())
cursor.setString(hostSpecFlavor, host.flavor().get().name());
}
/** Returns the hosts of this allocation */
public Set<HostSpec> getHosts() { return hosts; }
private static AllocatedHosts fromSlime(Inspector inspector, Optional<NodeFlavors> nodeFlavors) {
Inspector array = inspector.field(mappingKey);
Set<HostSpec> hosts = new LinkedHashSet<>();
array.traverse(new ArrayTraverser() {
@Override
public void entry(int i, Inspector inspector) {
hosts.add(hostsFromSlime(inspector.field(hostSpecKey), nodeFlavors));
}
});
return new AllocatedHosts(hosts);
}
static HostSpec hostsFromSlime(Inspector object, Optional<NodeFlavors> nodeFlavors) {
Optional<ClusterMembership> membership =
object.field(hostSpecMembership).valid() ? Optional.of(membershipFromSlime(object)) : Optional.empty();
Optional<Flavor> flavor =
object.field(hostSpecFlavor).valid() ? flavorFromSlime(object, nodeFlavors) : Optional.empty();
return new HostSpec(object.field(hostSpecHostName).asString(),Collections.emptyList(), flavor, membership);
}
private static ClusterMembership membershipFromSlime(Inspector object) {
return ClusterMembership.from(object.field(hostSpecMembership).asString(),
com.yahoo.component.Version.fromString(object.field(hostSpecVespaVersion).asString()));
}
private static Optional<Flavor> flavorFromSlime(Inspector object, Optional<NodeFlavors> nodeFlavors) {
return nodeFlavors.map(flavorMapper -> flavorMapper.getFlavor(object.field(hostSpecFlavor).asString()))
.orElse(Optional.empty());
}
public byte[] toJson() throws IOException {
Slime slime = new Slime();
toSlime(slime.setObject());
return SlimeUtils.toJsonBytes(slime);
}
public static AllocatedHosts fromJson(byte[] json, Optional<NodeFlavors> nodeFlavors) {
return fromSlime(SlimeUtils.jsonToSlime(json).get(), nodeFlavors);
}
@Override
public boolean equals(Object other) {
if (other == this) return true;
if ( ! (other instanceof AllocatedHosts)) return false;
return ((AllocatedHosts) other).hosts.equals(this.hosts);
}
@Override
public int hashCode() {
return hosts.hashCode();
}
}
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