Package com.yahoo.config.provision

Interface Provisioner

public interface Provisioner

Interface used by the config system to acquire hosts.

Author:

Ulf Lilleengen

Method Summary

Modifier and Type	Method	Description
void	activate(Collection<HostSpec> hosts, ActivationContext context, ApplicationTransaction transaction)	Activates the allocation of nodes to this application captured in the hosts argument.
ProvisionLock	lock(ApplicationId application)	Returns a provision lock for the given application
List<HostSpec>	prepare(ApplicationId applicationId, ClusterSpec cluster, Capacity capacity, ProvisionLogger logger)	Prepares allocation of a set of hosts with a given type, common id and the amount.
void	remove(ApplicationTransaction transaction)	Transactionally remove an application under lock.
void	restart(ApplicationId application, HostFilter filter)	Requests a restart of the services of the given application

Method Detail

prepare

List<HostSpec> prepare(ApplicationId applicationId,
                       ClusterSpec cluster,
                       Capacity capacity,
                       ProvisionLogger logger)

Prepares allocation of a set of hosts with a given type, common id and the amount.

Parameters:

applicationId - the application requesting hosts

cluster - the specification of the cluster to allocate nodes for

capacity - the capacity requested

logger - a logger which receives messages which are returned to the requestor

Returns:

the specification of the hosts allocated

activate

void activate(Collection<HostSpec> hosts,
              ActivationContext context,
              ApplicationTransaction transaction)

Activates the allocation of nodes to this application captured in the hosts argument.

remove

void remove(ApplicationTransaction transaction)

Transactionally remove an application under lock.

restart

void restart(ApplicationId application,
             HostFilter filter)

Requests a restart of the services of the given application

Parameters:

application - the application to restart

filter - a filter which matches the application nodes to restart

lock

ProvisionLock lock(ApplicationId application)

Returns a provision lock for the given application