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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.vespa.hosted.node.admin.nodeagent;
import java.util.Map;
/**
* Responsible for management of a single node over its lifecycle.
* May own its own resources, threads etc. Runs independently, but receives signals
* on state changes in the environment that may trigger this agent to take actions.
*
* @author bakksjo
*/
public interface NodeAgent {
/**
* Will eventually freeze/unfreeze the node agent
* @param frozen whether node agent should be frozen
* @return True if node agent has converged to the desired state
*/
boolean setFrozen(boolean frozen);
void stopServices();
/**
* Returns a map containing all relevant NodeAgent variables and their current values.
*/
Map<String, Object> debugInfo();
/**
* Starts the agent. After this method is called, the agent will asynchronously maintain the node, continuously
* striving to make the current state equal to the wanted state.
*/
void start();
/**
* Signals to the agent that the node is at the end of its lifecycle and no longer needs a managing agent.
* Cleans up any resources the agent owns, such as threads, connections etc. Cleanup is synchronous; when this
* method returns, no more actions will be taken by the agent.
*/
void stop();
/**
* Updates metric receiver with the latest node-agent stats
*/
void updateContainerNodeMetrics();
String getHostname();
/**
* Returns true if NodeAgent is waiting for an image download to finish
*/
boolean isDownloadingImage();
/**
* Returns and resets number of unhandled exceptions
*/
int getAndResetNumberOfUnhandledExceptions();
}
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