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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.ImmutableList;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
/**
* A specification of a host and its role.
* The identity of a host is determined by its name.
*
* @author hmusum
*/
public class HostSpec implements Comparable<HostSpec> {
/** The name of this host */
private final String hostname;
/** Aliases of this host */
private final List<String> aliases;
/** The current membership role of this host in the cluster it belongs to */
private final Optional<ClusterMembership> membership;
private final Optional<Flavor> flavor;
public HostSpec(String hostname, Optional<ClusterMembership> membership) {
this(hostname, new ArrayList<>(), Optional.empty(), membership);
}
public HostSpec(String hostname, ClusterMembership membership, Flavor flavor) {
this(hostname, new ArrayList<>(), Optional.of(flavor), Optional.of(membership));
}
public HostSpec(String hostname, List<String> aliases) {
this(hostname, aliases, Optional.empty(), Optional.empty());
}
public HostSpec(String hostname, List<String> aliases, ClusterMembership membership) {
this(hostname, aliases, Optional.empty(), Optional.of(membership));
}
public HostSpec(String hostname, List<String> aliases, Optional<Flavor> flavor, Optional<ClusterMembership> membership) {
if (hostname == null || hostname.isEmpty()) throw new IllegalArgumentException("Hostname must be specified");
this.hostname = hostname;
this.aliases = ImmutableList.copyOf(aliases);
this.flavor = flavor;
this.membership = membership;
}
/** Returns the name identifying this host */
public String hostname() { return hostname; }
/** Returns the aliases of this host as an immutable list. This may be empty but never null. */
public List<String> aliases() { return aliases; }
public Optional<Flavor> flavor() { return flavor; }
/** Returns the membership of this host, or an empty value if not present */
public Optional<ClusterMembership> membership() { return membership; }
@Override
public String toString() {
return hostname +
(! aliases.isEmpty() ? " (aliases: " + aliases + ")" : "") +
(membership.isPresent() ? " (membership: " + membership.get() + ")" : " (no membership)");
}
@Override
public boolean equals(Object o) {
if ( ! (o instanceof HostSpec)) return false;
HostSpec other = (HostSpec) o;
return this.hostname().equals(other.hostname());
}
@Override
public int hashCode() {
return hostname.hashCode();
}
@Override
public int compareTo(HostSpec other) {
return hostname.compareTo(other.hostname);
}
}
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