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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.model.provision;
import com.yahoo.config.model.api.HostProvisioner;
import com.yahoo.config.provision.Capacity;
import com.yahoo.config.provision.ClusterMembership;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.Flavor;
import com.yahoo.config.provision.HostSpec;
import com.yahoo.config.provision.ProvisionLogger;
import com.yahoo.net.HostName;
import java.util.ArrayList;
import java.util.List;
/**
* A host provisioner used when there is no hosts.xml file (using localhost as the only host)
* No state in this provisioner, i.e it does not know anything about the active
* application if one exists.
*
* @author hmusum
*/
public class SingleNodeProvisioner implements HostProvisioner {
private final Host host; // the only host in this system
private final HostSpec hostSpec;
private int counter = 0;
public SingleNodeProvisioner() {
host = new Host(HostName.getLocalhost());
this.hostSpec = new HostSpec(host.hostname(), host.aliases());
}
public SingleNodeProvisioner(Flavor flavor) {
host = new Host(HostName.getLocalhost());
this.hostSpec = new HostSpec(host.hostname(), host.aliases(), flavor);
}
@Override
public HostSpec allocateHost(String alias) {
return hostSpec;
}
@Override
@Deprecated // TODO: Remove after April 2020
public List<HostSpec> prepare(ClusterSpec cluster, Capacity capacity, int groups, ProvisionLogger logger) {
return prepare(cluster, capacity.withGroups(groups), logger);
}
@Override
public List<HostSpec> prepare(ClusterSpec cluster, Capacity capacity, ProvisionLogger logger) {
// TODO: This should fail if capacity requested is more than 1
List<HostSpec> hosts = new ArrayList<>();
hosts.add(new HostSpec(host.hostname(), host.aliases(), ClusterMembership.from(cluster, counter++)));
return hosts;
}
}
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