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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.config.model.api;
import com.yahoo.config.provision.AllocatedHosts;
import com.yahoo.vespa.config.ConfigKey;
import com.yahoo.vespa.config.ConfigPayload;
import com.yahoo.vespa.config.buildergen.ConfigDefinition;
import java.time.Instant;
import java.util.Set;
import java.util.Collection;
/**
* A {@link Model} represents the interface towards the model of an entire tenant, and defines methods
* for querying this model.
*
* @author Ulf Lilleengen
*/
public interface Model {
/**
* Resolves config for a given key and config definition
*
* @param configKey The key to resolve
* @param configDefinition The config definition to use for the schema
*/
ConfigPayload getConfig(ConfigKey<?> configKey, ConfigDefinition configDefinition);
/**
* Produces a set of the valid config keys for this model.
*/
Set<ConfigKey<?>> allConfigsProduced();
/**
* Returns information about all hosts used in this model.
*/
Collection<HostInfo> getHosts();
/**
* Returns all the config ids available for this model.
*/
Set<String> allConfigIds();
/**
* Asks the {@link Model} instance to distribute files using provided filedistribution instance.
* @param fileDistribution {@link com.yahoo.config.model.api.FileDistribution} instance that can be called to distribute files.
*/
void distributeFiles(FileDistribution fileDistribution);
/**
* Tells file distributor to rescan all files. At the moment this is a very expensive operation, so should only be done
* once per deployment.
* @param fileDistribution {@link com.yahoo.config.model.api.FileDistribution} instance.
*/
default void reloadDeployFileDistributor(FileDistribution fileDistribution) { }
/**
* Gets the allocated hosts for this model.
*
* @return {@link AllocatedHosts} instance, if available.
*/
AllocatedHosts allocatedHosts();
/**
* Returns whether this application allows serving config request for a different version.
* This is a validation override which is useful when we skip loading old config models
* due to some problem, or when we need to try a newer version of the platform on some node.
*/
default boolean allowModelVersionMismatch(Instant now) { return false; }
/**
* Returns whether old config models should be loaded (default) or not.
* Skipping old config models is a validation override which is useful when the old model
* version is known to contain some incompatibility with the application package
* and it is believed that the latest model version will deliver usable config for old versions
* requesting config.
* <p>
* If a model returns true to this it should also return true to {@link #allowModelVersionMismatch}
* or clients requesting config for those old models will not get config at all.
*/
default boolean skipOldConfigModels(Instant now) { return false; }
}
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