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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.config.model;
import com.yahoo.config.model.deploy.DeployState;
/**
* A config model is an abstract representation of a subsystem, which is used
* by the builder of that subsystem to derive a config producer tree for the subsystem, and by other
* builders to access information about the subsystem for config production at a suitable abstraction level.
*
* @author gjoranv
* @author bratseth
* @author Ulf Lilleengen
*/
public abstract class ConfigModel {
private final String id;
/**
* Constructs a new config model given a context.
*
* @param modelContext The model context.
*/
public ConfigModel(ConfigModelContext modelContext) {
super();
this.id = modelContext.getProducerId();
}
/** Returns the id of this model */
public final String getId() { return id; }
/**
* Initializes this model. All inter-model independent initialization
* is done by implementing this method.
* The model will be made available to dependent models by the framework when this returns.
* <p>
* TODO: Remove this method, as this is now done by the model builders.
*
* This default implementation does nothing.
*
* @param configModelRepo The ConfigModelRepo of the VespaModel
*/
public void initialize(ConfigModelRepo configModelRepo) { }
/**
* Prepares this model to start serving config requests, possibly using properties of other models.
* The framework will call this method after models have been built. The model
* should finalize its configurations that depend on other models in this step.
*
* This default implementation does nothing.
*
* @param configModelRepo The ConfigModelRepo of the system model
*/
public void prepare(ConfigModelRepo configModelRepo, DeployState deployState) { }
/**
* <p>Returns whether this model must be maintained in memory for serving config requests.
* Models which are used to amend other models at build time should override this to return false.</p>
*
* <p>This default implementation returns true.</p>
*/
public boolean isServing() { return true; }
}
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