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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.provision;
import com.yahoo.transaction.NestedTransaction;
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.
*
* @param transaction Transaction with operations to commit together with any operations done within the provisioner.
* @param application The {@link ApplicationId} that was activated.
* @param hosts a set of {@link HostSpec}.
*/
// TODO(mpolden): Remove
void activate(NestedTransaction transaction, ApplicationId application, Collection<HostSpec> hosts);
/**
* Activates the allocation of nodes to this application captured in the hosts argument.
*
* @param transaction Transaction with operations to commit together with any operations done within the provisioner.
* @param hosts a set of {@link HostSpec}.
* @param lock A provision lock for the relevant application. This must be held when calling this.
*/
void activate(NestedTransaction transaction, Collection<HostSpec> hosts, ProvisionLock lock);
/**
* Transactionally remove this application.
*
* @param transaction Transaction with operations to commit together with any operations done within the provisioner.
* @param application the application to remove
*/
// TODO(mpolden): Remove
void remove(NestedTransaction transaction, ApplicationId application);
/**
* Transactionally remove application guarded by given lock.
*
* @param transaction Transaction with operations to commit together with any operations done within the provisioner.
* @param lock A provision lock for the relevant application. This must be held when calling this.
*/
void remove(NestedTransaction transaction, ProvisionLock lock);
/**
* 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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