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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.dse.transition.statespace.internal;
import tools.refinery.store.dse.transition.VersionWithObjectiveValue;
import tools.refinery.store.dse.transition.statespace.ActivationStore;
import java.util.*;
import java.util.function.Consumer;
public class ActivationStoreImpl implements ActivationStore {
final int numberOfTransformations;
final Consumer<VersionWithObjectiveValue> actionWhenAllActivationVisited;
final Map<VersionWithObjectiveValue, List<ActivationStoreEntry>> versionToActivations;
public ActivationStoreImpl(final int numberOfTransformations,
Consumer<VersionWithObjectiveValue> actionWhenAllActivationVisited) {
this.numberOfTransformations = numberOfTransformations;
this.actionWhenAllActivationVisited = actionWhenAllActivationVisited;
versionToActivations = new HashMap<>();
}
public synchronized VisitResult markNewAsVisited(VersionWithObjectiveValue to, int[] emptyEntrySizes) {
boolean[] successful = new boolean[]{false};
var entries = versionToActivations.computeIfAbsent(to, x -> {
successful[0] = true;
List<ActivationStoreEntry> result = new ArrayList<>(emptyEntrySizes.length);
for (int emptyEntrySize : emptyEntrySizes) {
result.add(ActivationStoreEntry.create(emptyEntrySize));
}
return result;
});
boolean hasMore = false;
for (var entry : entries) {
if (entry.getNumberOfUnvisitedActivations() > 0) {
hasMore = true;
break;
}
}
if (!hasMore) {
actionWhenAllActivationVisited.accept(to);
}
return new VisitResult(successful[0], hasMore, -1, -1);
}
public synchronized VisitResult visitActivation(VersionWithObjectiveValue from, int transformationIndex,
int activationIndex) {
var entries = versionToActivations.get(from);
var entry = entries.get(transformationIndex);
final int unvisited = entry.getNumberOfUnvisitedActivations();
final boolean successfulVisit = unvisited > 0;
final boolean hasMoreInActivation = unvisited > 1;
final boolean hasMore;
final int transformation;
final int activation;
if (successfulVisit) {
transformation = transformationIndex;
activation = entry.getAndAddActivationAfter(activationIndex);
} else {
transformation = -1;
activation = -1;
}
if (!hasMoreInActivation) {
boolean hasMoreInOtherTransformation = false;
for (var e : entries) {
if (e != entry && e.getNumberOfUnvisitedActivations() > 0) {
hasMoreInOtherTransformation = true;
break;
}
}
hasMore = hasMoreInOtherTransformation;
} else {
hasMore = true;
}
if (!hasMore) {
actionWhenAllActivationVisited.accept(from);
}
return new VisitResult(successfulVisit, hasMore, transformation, activation);
}
@Override
public synchronized boolean hasUnmarkedActivation(VersionWithObjectiveValue version) {
var entries = versionToActivations.get(version);
boolean hasMore = false;
for (var entry : entries) {
if (entry.getNumberOfUnvisitedActivations() > 0) {
hasMore = true;
break;
}
}
return hasMore;
}
@Override
public synchronized VisitResult getRandomAndMarkAsVisited(VersionWithObjectiveValue version, Random random) {
var entries = versionToActivations.get(version);
var weights = new double[entries.size()];
double totalWeight = 0;
int numberOfAllUnvisitedActivations = 0;
for (int i = 0; i < weights.length; i++) {
var entry = entries.get(i);
int unvisited = entry.getNumberOfUnvisitedActivations();
double weight = unvisited == 0 ? 0 : unvisited; //(Math.log(unvisited) + 1.0);
weights[i] = weight;
totalWeight += weight;
numberOfAllUnvisitedActivations += unvisited;
}
if (numberOfAllUnvisitedActivations == 0) {
this.actionWhenAllActivationVisited.accept(version);
return new VisitResult(false, false, -1, -1);
}
double offset = random.nextDouble(totalWeight);
int transformation = 0;
for (; transformation < entries.size(); transformation++) {
double weight = weights[transformation];
if (weight > 0 && offset < weight) {
var entry = entries.get(transformation);
int activation = random.nextInt(entry.getNumberOfActivations());
return this.visitActivation(version, transformation, activation);
}
offset -= weight;
}
throw new AssertionError("Unvisited activation %f not found".formatted(offset));
}
}
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