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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.dse.strategy;
import org.jetbrains.annotations.Nullable;
import tools.refinery.store.dse.propagation.PropagationAdapter;
import tools.refinery.store.dse.transition.DesignSpaceExplorationAdapter;
import tools.refinery.store.dse.transition.ObjectiveValue;
import tools.refinery.store.dse.transition.VersionWithObjectiveValue;
import tools.refinery.store.dse.transition.statespace.internal.ActivationStoreWorker;
import tools.refinery.store.map.Version;
import tools.refinery.store.model.Model;
import tools.refinery.store.query.ModelQueryAdapter;
import tools.refinery.store.statecoding.StateCoderAdapter;
import tools.refinery.visualization.statespace.VisualizationStore;
import java.util.Random;
public class BestFirstWorker {
final BestFirstStoreManager storeManager;
final Model model;
final ActivationStoreWorker activationStoreWorker;
final StateCoderAdapter stateCoderAdapter;
final DesignSpaceExplorationAdapter explorationAdapter;
final ModelQueryAdapter queryAdapter;
final @Nullable PropagationAdapter propagationAdapter;
final VisualizationStore visualizationStore;
final boolean isVisualizationEnabled;
public BestFirstWorker(BestFirstStoreManager storeManager, Model model) {
this.storeManager = storeManager;
this.model = model;
explorationAdapter = model.getAdapter(DesignSpaceExplorationAdapter.class);
stateCoderAdapter = model.getAdapter(StateCoderAdapter.class);
queryAdapter = model.getAdapter(ModelQueryAdapter.class);
propagationAdapter = model.tryGetAdapter(PropagationAdapter.class).orElse(null);
activationStoreWorker = new ActivationStoreWorker(storeManager.getActivationStore(),
explorationAdapter.getTransformations());
visualizationStore = storeManager.getVisualizationStore();
isVisualizationEnabled = visualizationStore != null;
}
protected VersionWithObjectiveValue last = null;
public SubmitResult submit() {
checkSynchronized();
if (queryAdapter.hasPendingChanges()) {
throw new AssertionError("Pending changes detected before model submission");
}
if (explorationAdapter.checkExclude()) {
return new SubmitResult(false, false, null, null);
}
var code = stateCoderAdapter.calculateStateCode();
boolean isNew = storeManager.getEquivalenceClassStore().submit(code);
if (isNew) {
Version version = model.commit();
ObjectiveValue objectiveValue = explorationAdapter.getObjectiveValue();
var versionWithObjectiveValue = new VersionWithObjectiveValue(version, objectiveValue);
last = versionWithObjectiveValue;
var accepted = explorationAdapter.checkAccept();
storeManager.getObjectiveStore().submit(versionWithObjectiveValue);
storeManager.getActivationStore().markNewAsVisited(versionWithObjectiveValue, activationStoreWorker.calculateEmptyActivationSize());
if(accepted) {
storeManager.solutionStore.submit(versionWithObjectiveValue);
}
if (isVisualizationEnabled) {
visualizationStore.addState(last.version(), last.objectiveValue().toString());
if (accepted) {
visualizationStore.addSolution(last.version());
}
}
return new SubmitResult(true, accepted, objectiveValue, last);
}
return new SubmitResult(false, false, null, null);
}
public void restoreToLast() {
if (explorationAdapter.getModel().hasUncommittedChanges()) {
explorationAdapter.getModel().restore(last.version());
}
}
public VersionWithObjectiveValue restoreToBest() {
var bestVersion = storeManager.getObjectiveStore().getBest();
last = bestVersion;
if (bestVersion != null) {
this.model.restore(bestVersion.version());
}
return last;
}
public VersionWithObjectiveValue restoreToRandom(Random random) {
var objectiveStore = storeManager.getObjectiveStore();
if (objectiveStore.getSize() == 0) {
return null;
}
var randomVersion = objectiveStore.getRandom(random);
last = randomVersion;
if (randomVersion != null) {
this.model.restore(randomVersion.version());
}
return last;
}
public int compare(VersionWithObjectiveValue s1, VersionWithObjectiveValue s2) {
return storeManager.getObjectiveStore().getComparator().compare(s1, s2);
}
public record RandomVisitResult(SubmitResult submitResult, boolean shouldRetry) {
}
public RandomVisitResult visitRandomUnvisited(Random random) {
checkSynchronized();
if (model.hasUncommittedChanges()) {
throw new IllegalStateException("The model has uncommitted changes!");
}
var visitResult = activationStoreWorker.fireRandomActivation(this.last, random);
if (!visitResult.successfulVisit()) {
return new RandomVisitResult(null, visitResult.mayHaveMore());
}
if (propagationAdapter != null) {
var propagationResult = propagationAdapter.propagate();
if (propagationResult.isRejected()) {
return new RandomVisitResult(null, visitResult.mayHaveMore());
}
}
queryAdapter.flushChanges();
Version oldVersion = null;
if (isVisualizationEnabled) {
oldVersion = last.version();
}
var submitResult = submit();
if (isVisualizationEnabled && submitResult.newVersion() != null) {
var newVersion = submitResult.newVersion().version();
visualizationStore.addTransition(oldVersion, newVersion,
"fire: " + visitResult.transformation() + ", " + visitResult.activation());
}
return new RandomVisitResult(submitResult, visitResult.mayHaveMore());
}
public boolean hasEnoughSolution() {
return storeManager.solutionStore.hasEnoughSolution();
}
private void checkSynchronized() {
if (last != null && !last.version().equals(model.getState())) {
throw new AssertionError("Worker is not synchronized with model state");
}
}
}
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