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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.web.generator;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.eclipse.emf.common.util.URI;
import org.eclipse.xtext.diagnostics.Severity;
import org.eclipse.xtext.resource.IResourceFactory;
import org.eclipse.xtext.resource.XtextResourceSet;
import org.eclipse.xtext.service.OperationCanceledManager;
import org.eclipse.xtext.util.LazyStringInputStream;
import org.eclipse.xtext.validation.CheckMode;
import org.eclipse.xtext.validation.IResourceValidator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import tools.refinery.language.model.problem.Problem;
import tools.refinery.language.semantics.metadata.MetadataCreator;
import tools.refinery.language.semantics.model.ModelInitializer;
import tools.refinery.language.web.semantics.PartialInterpretation2Json;
import tools.refinery.language.web.xtext.server.ThreadPoolExecutorServiceProvider;
import tools.refinery.language.web.xtext.server.push.PushWebDocument;
import tools.refinery.store.dse.propagation.PropagationAdapter;
import tools.refinery.store.dse.strategy.BestFirstStoreManager;
import tools.refinery.store.dse.transition.DesignSpaceExplorationAdapter;
import tools.refinery.store.model.ModelStore;
import tools.refinery.store.query.viatra.ViatraModelQueryAdapter;
import tools.refinery.store.reasoning.ReasoningAdapter;
import tools.refinery.store.reasoning.ReasoningStoreAdapter;
import tools.refinery.store.reasoning.literal.Concreteness;
import tools.refinery.store.statecoding.StateCoderAdapter;
import tools.refinery.store.util.CancellationToken;
import java.io.IOException;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.*;
public class ModelGenerationWorker implements Runnable {
private static final Logger LOG = LoggerFactory.getLogger(ModelGenerationWorker.class);
private final UUID uuid = UUID.randomUUID();
private PushWebDocument state;
private String text;
private volatile boolean timedOut;
private volatile boolean cancelled;
@Inject
private OperationCanceledManager operationCanceledManager;
@Inject
private Provider<XtextResourceSet> resourceSetProvider;
@Inject
private IResourceFactory resourceFactory;
@Inject
private IResourceValidator resourceValidator;
@Inject
private ModelInitializer initializer;
@Inject
private MetadataCreator metadataCreator;
@Inject
private PartialInterpretation2Json partialInterpretation2Json;
private final Object lockObject = new Object();
private ExecutorService executorService;
private ScheduledExecutorService scheduledExecutorService;
private int randomSeed;
private long timeoutSec;
private Future<?> future;
private ScheduledFuture<?> timeoutFuture;
private final CancellationToken cancellationToken = () -> {
if (cancelled || Thread.interrupted()) {
operationCanceledManager.throwOperationCanceledException();
}
};
@Inject
public void setExecutorServiceProvider(ThreadPoolExecutorServiceProvider provider) {
executorService = provider.get(ModelGenerationService.MODEL_GENERATION_EXECUTOR);
scheduledExecutorService = provider.getScheduled(ModelGenerationService.MODEL_GENERATION_TIMEOUT_EXECUTOR);
}
public void setState(PushWebDocument state, int randomSeed, long timeoutSec) {
this.state = state;
this.randomSeed = randomSeed;
this.timeoutSec = timeoutSec;
text = state.getText();
}
public UUID getUuid() {
return uuid;
}
public void start() {
synchronized (lockObject) {
LOG.debug("Enqueueing model generation: {}", uuid);
future = executorService.submit(this);
}
}
public void startTimeout() {
synchronized (lockObject) {
LOG.debug("Starting model generation: {}", uuid);
cancellationToken.checkCancelled();
timeoutFuture = scheduledExecutorService.schedule(() -> cancel(true), timeoutSec, TimeUnit.SECONDS);
}
}
// We catch {@code Throwable} to handle {@code OperationCancelledError}, but we rethrow fatal JVM errors.
@SuppressWarnings("squid:S1181")
@Override
public void run() {
startTimeout();
notifyResult(new ModelGenerationStatusResult(uuid, "Initializing model generator"));
ModelGenerationResult result;
try {
result = doRun();
} catch (Throwable e) {
if (operationCanceledManager.isOperationCanceledException(e)) {
var message = timedOut ? "Model generation timed out" : "Model generation cancelled";
LOG.debug("{}: {}", message, uuid);
notifyResult(new ModelGenerationErrorResult(uuid, message));
} else if (e instanceof Error error) {
// Make sure we don't try to recover from any fatal JVM errors.
throw error;
} else {
LOG.debug("Model generation error", e);
notifyResult(new ModelGenerationErrorResult(uuid, e.toString()));
}
return;
}
notifyResult(result);
}
private void notifyResult(ModelGenerationResult result) {
state.notifyPrecomputationListeners(ModelGenerationService.SERVICE_NAME, result);
}
public ModelGenerationResult doRun() throws IOException {
cancellationToken.checkCancelled();
var resourceSet = resourceSetProvider.get();
var uri = URI.createURI("__synthetic_" + uuid + ".problem");
var resource = resourceFactory.createResource(uri);
resourceSet.getResources().add(resource);
var inputStream = new LazyStringInputStream(text);
resource.load(inputStream, Map.of());
cancellationToken.checkCancelled();
var issues = resourceValidator.validate(resource, CheckMode.ALL, () -> cancelled || Thread.interrupted());
cancellationToken.checkCancelled();
for (var issue : issues) {
if (issue.getSeverity() == Severity.ERROR) {
return new ModelGenerationErrorResult(uuid, "Validation error: " + issue.getMessage());
}
}
if (resource.getContents().isEmpty() || !(resource.getContents().get(0) instanceof Problem problem)) {
return new ModelGenerationErrorResult(uuid, "Model generation problem not found");
}
cancellationToken.checkCancelled();
var storeBuilder = ModelStore.builder()
.cancellationToken(cancellationToken)
.with(ViatraModelQueryAdapter.builder())
.with(PropagationAdapter.builder())
.with(StateCoderAdapter.builder())
.with(DesignSpaceExplorationAdapter.builder())
.with(ReasoningAdapter.builder()
.requiredInterpretations(Concreteness.CANDIDATE));
var modelSeed = initializer.createModel(problem, storeBuilder);
var store = storeBuilder.build();
cancellationToken.checkCancelled();
var model = store.getAdapter(ReasoningStoreAdapter.class).createInitialModel(modelSeed);
var initialVersion = model.commit();
cancellationToken.checkCancelled();
notifyResult(new ModelGenerationStatusResult(uuid, "Generating model"));
var bestFirst = new BestFirstStoreManager(store, 1);
bestFirst.startExploration(initialVersion, randomSeed);
cancellationToken.checkCancelled();
var solutionStore = bestFirst.getSolutionStore();
if (solutionStore.getSolutions().isEmpty()) {
return new ModelGenerationErrorResult(uuid, "Problem is unsatisfiable");
}
notifyResult(new ModelGenerationStatusResult(uuid, "Saving generated model"));
model.restore(solutionStore.getSolutions().get(0).version());
cancellationToken.checkCancelled();
metadataCreator.setInitializer(initializer);
var nodesMetadata = metadataCreator.getNodesMetadata(model.getAdapter(ReasoningAdapter.class).getNodeCount(),
false);
cancellationToken.checkCancelled();
var relationsMetadata = metadataCreator.getRelationsMetadata();
cancellationToken.checkCancelled();
var partialInterpretation = partialInterpretation2Json.getPartialInterpretation(initializer, model,
Concreteness.CANDIDATE, cancellationToken);
return new ModelGenerationSuccessResult(uuid, nodesMetadata, relationsMetadata, partialInterpretation);
}
public void cancel() {
cancel(false);
}
public void cancel(boolean timedOut) {
synchronized (lockObject) {
LOG.trace("Cancelling model generation: {}", uuid);
this.timedOut = timedOut;
cancelled = true;
if (future != null) {
future.cancel(true);
future = null;
}
if (timeoutFuture != null) {
timeoutFuture.cancel(true);
timeoutFuture = null;
}
}
}
}
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