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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.component.chain;
import com.yahoo.component.ComponentSpecification;
import com.yahoo.component.chain.model.ChainSpecification;
import com.yahoo.component.chain.model.ChainedComponentModel;
import com.yahoo.component.chain.model.ChainsModel;
import com.yahoo.component.provider.ComponentRegistry;
import com.yahoo.config.ConfigurationRuntimeException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
/**
* Configures a registry of chains.
*
* @author bratseth
* @author gjoranv
*/
public class ChainsConfigurer {
public static <COMPONENT extends ChainedComponent> void prepareChainRegistry(
ComponentRegistry<Chain<COMPONENT>> registry,
ChainsModel model,
ComponentRegistry<COMPONENT> allComponents) {
initDependencies(model, allComponents);
instantiateChains(registry, model, allComponents);
}
private static <COMPONENT extends ChainedComponent> void initDependencies(
ChainsModel model,
ComponentRegistry<COMPONENT> allComponents) {
for (ChainedComponentModel componentModel : model.allComponents()) {
COMPONENT component = getComponentOrThrow(allComponents, componentModel.getComponentId().toSpecification());
component.initDependencies(componentModel.dependencies);
}
}
private static <COMPONENT extends ChainedComponent> COMPONENT getComponentOrThrow(
ComponentRegistry<COMPONENT> registry,
ComponentSpecification specification) {
COMPONENT component = registry.getComponent(specification);
if (component == null) {
throw new ConfigurationRuntimeException("No such component '" + specification + "'");
}
return component;
}
private static <COMPONENT extends ChainedComponent> void instantiateChains(
ComponentRegistry<Chain<COMPONENT>> chainRegistry,
ChainsModel model,
ComponentRegistry<COMPONENT> allComponents) {
for (ChainSpecification chain : model.allChainsFlattened()) {
try {
Chain<COMPONENT> componentChain = new Chain<>(chain.componentId,
resolveComponents(chain.componentReferences, allComponents),
chain.phases());
chainRegistry.register(chain.componentId, componentChain);
} catch (Exception e) {
throw new ConfigurationRuntimeException("Invalid chain '" + chain.componentId + "'", e);
}
}
}
private static <T extends ChainedComponent> List<T> resolveComponents(
Set<ComponentSpecification> componentSpecifications,
ComponentRegistry<T> allComponents) {
List<T> components = new ArrayList<>(componentSpecifications.size());
for (ComponentSpecification componentSpec : componentSpecifications) {
T component = getComponentOrThrow(allComponents, componentSpec);
components.add(component);
}
return components;
}
}
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