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package coffee.liz.ecs;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import coffee.liz.ecs.model.Component;
import coffee.liz.ecs.model.Entity;
import coffee.liz.ecs.model.System;
import coffee.liz.ecs.model.World;
import lombok.RequiredArgsConstructor;
import org.junit.jupiter.api.Test;
import java.time.Duration;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
final class DAGWorldTest {
@Test
public void queryReturnsEntitiesMatchingAllRequestedComponents() {
final DAGWorld<String> world = new DAGWorld<>(Map.of());
final Entity matching = world.createEntity();
matching.add(new PositionComponent());
matching.add(new VelocityComponent());
final Entity partial = world.createEntity();
partial.add(new PositionComponent());
final Entity nonMatching = world.createEntity();
nonMatching.add(new VelocityComponent());
world.update("state", Duration.ZERO);
final Set<Entity> results = world.query(Set.of(PositionComponent.class, VelocityComponent.class));
assertEquals(Set.of(matching), results);
}
@Test
public void queryWithoutComponentsReturnsAllEntities() {
final DAGWorld<String> world = new DAGWorld<>(Map.of());
final Entity entityOne = world.createEntity();
final Entity entityTwo = world.createEntity();
final Set<Entity> results = world.query(List.<Class<? extends Component>>of());
assertEquals(Set.of(entityOne, entityTwo), results);
}
@Test
public void updateExecutesSystemsInTopologicalOrder() {
final CopyOnWriteArrayList<String> executionLog = new CopyOnWriteArrayList<>();
final DAGWorld<String> world = new DAGWorld<>(Map.of(SystemC.class, new SystemC(executionLog), SystemA.class,
new SystemA(executionLog), SystemB.class, new SystemB(executionLog)));
world.update("state", Duration.ZERO);
assertEquals(List.of("A", "B", "C"), executionLog);
}
@Test
public void updateRefreshesComponentCacheAfterEntityMutations() {
final DAGWorld<String> world = new DAGWorld<>(Map.of());
final Entity subject = world.createEntity();
world.update("state", Duration.ZERO);
assertTrue(world.query(Set.of(PositionComponent.class)).isEmpty());
subject.add(new PositionComponent());
world.update("state", Duration.ZERO);
assertEquals(1, world.query(Set.of(PositionComponent.class)).size());
subject.remove(PositionComponent.class);
world.update("state", Duration.ZERO);
assertTrue(world.query(Set.of(PositionComponent.class)).isEmpty());
}
@Test
public void queryFindsComponentsAddedByEarlierSystemInSameTick() {
final List<Set<Entity>> queryResults = new CopyOnWriteArrayList<>();
final Map<Class<? extends System<String>>, System<String>> systems = new LinkedHashMap<>();
systems.put(ComponentAdderSystem.class, new ComponentAdderSystem());
systems.put(ComponentReaderSystem.class, new ComponentReaderSystem(queryResults));
final DAGWorld<String> world = new DAGWorld<>(systems);
final Entity entity = world.createEntity();
entity.add(new PositionComponent());
world.update("state", Duration.ZERO);
assertEquals(1, queryResults.size());
assertEquals(Set.of(entity), queryResults.getFirst());
}
@Test
public void circularDependencyDetectionThrowsIllegalStateException() {
final Map<Class<? extends System<String>>, System<String>> systems = new LinkedHashMap<>();
final SystemCycleA systemA = new SystemCycleA();
final SystemCycleB systemB = new SystemCycleB();
systems.put(SystemCycleA.class, systemA);
systems.put(SystemCycleB.class, systemB);
assertThrows(IllegalStateException.class, () -> new DAGWorld<>(systems));
}
private static final class PositionComponent implements Component {
}
private static final class VelocityComponent implements Component {
}
@RequiredArgsConstructor
private abstract static class RecordingSystem implements System<String> {
private final List<String> log;
private final String label;
@Override
public final void update(final World<String> world, final String state, final Duration duration) {
log.add(label);
}
}
private static final class SystemA extends RecordingSystem {
private SystemA(final List<String> log) {
super(log, "A");
}
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return List.of();
}
}
private static final class SystemB extends RecordingSystem {
private SystemB(final List<String> log) {
super(log, "B");
}
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return Set.of(SystemA.class);
}
}
private static final class SystemC extends RecordingSystem {
private SystemC(final List<String> log) {
super(log, "C");
}
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return Set.of(SystemB.class);
}
}
private static final class SystemCycleA implements System<String> {
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return Set.of(SystemCycleB.class);
}
@Override
public void update(final World<String> world, final String state, final Duration duration) {
}
}
private static final class SystemCycleB implements System<String> {
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return Set.of(SystemCycleA.class);
}
@Override
public void update(final World<String> world, final String state, final Duration duration) {
}
}
private static final class ComponentAdderSystem implements System<String> {
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return List.of();
}
@Override
public void update(final World<String> world, final String state, final Duration duration) {
world.query(Set.of(PositionComponent.class)).forEach(e -> e.add(new VelocityComponent()));
}
}
@RequiredArgsConstructor
private static final class ComponentReaderSystem implements System<String> {
private final List<Set<Entity>> queryResults;
@Override
public Collection<Class<? extends System<String>>> getDependencies() {
return Set.of(ComponentAdderSystem.class);
}
@Override
public void update(final World<String> world, final String state, final Duration duration) {
queryResults.add(world.query(Set.of(VelocityComponent.class, PositionComponent.class)));
}
}
}
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