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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.vespa.hosted.node.admin.nodeadmin;
import com.yahoo.vespa.hosted.node.admin.nodeagent.NodeAgentContext;
import java.time.Duration;
import java.util.Set;
/**
* NodeAdmin manages the life cycle of NodeAgents.
* @author Haakon Dybdahl
*/
public interface NodeAdmin {
/** Start/stop NodeAgents and schedule next NodeAgent ticks with the given NodeAgentContexts */
void refreshContainersToRun(Set<NodeAgentContext> nodeAgentContexts);
/** Update node admin metrics */
void updateMetrics(boolean isSuspended);
/**
* Attempts to freeze/unfreeze all NodeAgents and itself. To freeze a NodeAgent means that
* they will not pick up any changes from NodeRepository.
*
* @param frozen whether NodeAgents and NodeAdmin should be frozen
* @return True if all the NodeAgents and NodeAdmin has converged to the desired state
*/
boolean setFrozen(boolean frozen);
/**
* Returns whether NodeAdmin itself is currently frozen, meaning it will not pick up any changes
* from NodeRepository.
*/
boolean isFrozen();
/**
* Returns an upper bound on the time some or all parts of the node admin (including agents)
* have been frozen. Returns 0 if not frozen, nor trying to freeze.
*/
Duration subsystemFreezeDuration();
/**
* Stop all services on these nodes
*/
void stopNodeAgentServices();
/**
* Start node-admin schedulers.
*/
void start();
/**
* Stop the NodeAgents. Will not delete the storage or stop the container.
*/
void stop();
}
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