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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision;
import java.util.Collection;
import java.util.List;
/**
* Interface used by the config system to acquire hosts.
*
* @author Ulf Lilleengen
*/
public interface Provisioner {
/**
* Prepares allocation of a set of hosts with a given type, common id and the amount.
*
* @param applicationId the application requesting hosts
* @param cluster the specification of the cluster to allocate nodes for
* @param capacity the capacity requested
* @param logger a logger which receives messages which are returned to the requestor
* @return the specification of the hosts allocated
*/
List<HostSpec> prepare(ApplicationId applicationId, ClusterSpec cluster, Capacity capacity, ProvisionLogger logger);
/** Activates the allocation of nodes to this application captured in the hosts argument. */
void activate(Collection<HostSpec> hosts, ActivationContext context, ApplicationTransaction transaction);
/** Transactionally remove an application under lock. */
void remove(ApplicationTransaction transaction);
/**
* Requests a restart of the services of the given application
*
* @param application the application to restart
* @param filter a filter which matches the application nodes to restart
*/
void restart(ApplicationId application, HostFilter filter);
/** Returns a provision lock for the given application */
ProvisionLock lock(ApplicationId application);
}
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