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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.*;
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
*/
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.readFrom(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.asCollection().size() > 1) {
throw new IllegalArgumentException("More than 1 host specified (" + hosts.asCollection().size() + ") and <admin> not specified");
} else {
return host2HostSpec(getFirstHost());
}
} else if (alias.equals(Container.SINGLENODE_CONTAINER_SERVICESPEC)) {
return host2HostSpec(getFirstHost());
}
for (Host host : hosts.asCollection()) {
if (host.aliases().contains(alias)) {
return new HostSpec(host.hostname(), host.aliases());
}
}
throw new IllegalArgumentException("Unable to find host for alias '" + alias + "'");
}
@Override
@Deprecated // TODO: Remove after April 2020
public List<HostSpec> prepare(ClusterSpec cluster, Capacity quantity, int groups, ProvisionLogger logger) {
throw new UnsupportedOperationException("Prepare on an XML host provisioner is not supported");
}
@Override
public List<HostSpec> prepare(ClusterSpec cluster, Capacity quantity, ProvisionLogger logger) {
throw new UnsupportedOperationException("Prepare on an XML host provisioner is not supported");
}
private HostSpec host2HostSpec(Host host) {
return new HostSpec(host.hostname(), host.aliases());
}
private Host getFirstHost() {
return hosts.asCollection().iterator().next();
}
}
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