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// Copyright 2016 Yahoo Inc. 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.*;
import com.yahoo.vespa.model.container.Container;
import java.io.Reader;
import java.util.List;
/**
* A host provisioner based on a hosts.xml file.
* No state in this provisioner, i.e it does not know anything about the active
* application if one exists. Pre-condition: A valid hosts file.
*
* @author hmusum
* @since 5.11
*/
public class HostsXmlProvisioner implements HostProvisioner {
private final Hosts hosts;
public static final String IMPLICIT_ADMIN_HOSTALIAS = "INTERNAL_VESPA_IMPLICIT_ADMIN";
public HostsXmlProvisioner(Reader hosts) {
this.hosts = Hosts.getHosts(hosts);
}
@Override
public HostSpec allocateHost(String alias) {
/**
* Some special rules to allow no admin elements as well
* as jdisc element without nodes.
*/
if (alias.equals(IMPLICIT_ADMIN_HOSTALIAS)) {
if (hosts.getHosts().size() > 1) {
throw new IllegalArgumentException("More than 1 host specified (" + hosts.getHosts().size() + ") and <admin> not specified");
} else {
return host2HostSpec(getFirstHost());
}
} else if (alias.equals(Container.SINGLENODE_CONTAINER_SERVICESPEC)) {
return host2HostSpec(getFirstHost());
}
for (Host host : hosts.getHosts()) {
if (host.getHostAliases().contains(alias)) {
return new HostSpec(host.getHostname(), host.getHostAliases());
}
}
throw new IllegalArgumentException("Unable to find host for alias '" + alias + "'");
}
@Override
public List<HostSpec> prepare(ClusterSpec cluster, Capacity quantity, int groups, ProvisionLogger logger) {
throw new UnsupportedOperationException();
}
private HostSpec host2HostSpec(Host host) {
return new HostSpec(host.getHostname(), host.getHostAliases());
}
private Host getFirstHost() {
return hosts.getHosts().iterator().next();
}
}
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