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package com.yahoo.config.provision;
/**
* A class which can be asked if allocations should be exclusive.
*
* @author bratseth
*/
public class Exclusivity {
private final Zone zone;
private final SharedHosts sharedHost;
public Exclusivity(Zone zone, SharedHosts sharedHost) {
this.zone = zone;
this.sharedHost = sharedHost;
}
/** Returns whether nodes must be allocated to hosts that are exclusive to the cluster type. */
public boolean clusterType(ClusterSpec cluster) {
return sharedHost.hasClusterType(cluster.type());
}
/** Returns whether the nodes of this cluster must be running on hosts that are specifically provisioned for the application. */
public boolean provisioning(ClusterSpec clusterSpec) {
return !zone.cloud().allowHostSharing() && clusterSpec.isExclusive();
}
/**
* Returns whether nodes are allocated exclusively in this instance given this cluster spec.
* Exclusive allocation requires that the wanted node resources matches the advertised resources of the node
* perfectly.
*/
public boolean allocation(ClusterSpec clusterSpec) {
return clusterSpec.isExclusive() ||
( clusterSpec.type().isContainer() && zone.system().isPublic() && !zone.environment().isTest() ) ||
( !zone.cloud().allowHostSharing() && !sharedHost.supportsClusterType(clusterSpec.type()));
}
}
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