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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.orchestrator.policy;
import com.yahoo.vespa.applicationmodel.ApplicationInstance;
import com.yahoo.vespa.applicationmodel.HostName;
import com.yahoo.vespa.orchestrator.OrchestratorContext;
import com.yahoo.vespa.orchestrator.model.ApplicationApi;
import com.yahoo.vespa.orchestrator.status.ApplicationLock;
/**
* @author oyving
*/
public interface Policy {
/**
* Decide whether to grant a request for temporarily suspending the services on all hosts in the group.
*/
SuspensionReasons grantSuspensionRequest(OrchestratorContext context, ApplicationApi applicationApi) throws HostStateChangeDeniedException;
void releaseSuspensionGrant(OrchestratorContext context, ApplicationApi application) throws HostStateChangeDeniedException;
/**
* Give all hosts in a group permission to be removed from the application.
*/
void acquirePermissionToRemove(OrchestratorContext context, ApplicationApi applicationApi) throws HostStateChangeDeniedException;
/**
* Release an earlier grant for suspension.
*
* @throws HostStateChangeDeniedException if the release failed.
*/
void releaseSuspensionGrant(
OrchestratorContext context, ApplicationInstance applicationInstance,
HostName hostName,
ApplicationLock hostStatusService) throws HostStateChangeDeniedException;
}
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