mirror of https://github.com/Minestom/Minestom.git
Make `EventNode` an interface
This commit is contained in:
TheMode
parent
42a6654993
commit
e1c1f1d545
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@ -1,25 +1,18 @@
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package net.minestom.server.event;
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import com.github.benmanes.caffeine.cache.Cache;
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import com.github.benmanes.caffeine.cache.Caffeine;
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import net.minestom.server.MinecraftServer;
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import net.minestom.server.event.trait.CancellableEvent;
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import net.minestom.server.tag.Tag;
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import net.minestom.server.tag.TagReadable;
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import net.minestom.server.utils.validate.Check;
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import org.jetbrains.annotations.ApiStatus;
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import org.jetbrains.annotations.Contract;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import java.util.*;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.CopyOnWriteArraySet;
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import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
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import java.util.List;
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import java.util.Set;
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import java.util.function.BiPredicate;
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import java.util.function.Consumer;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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/**
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* Represents a single node in an event graph.
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@ -30,7 +23,8 @@ import java.util.stream.Collectors;
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*
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* @param <T> The event type accepted by this node
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*/
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public class EventNode<T extends Event> {
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@ApiStatus.NonExtendable
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public interface EventNode<T extends Event> {
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/**
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* Creates an event node which accepts any event type with no filtering.
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@ -39,7 +33,7 @@ public class EventNode<T extends Event> {
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* @return An event node with no filtering
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*/
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@Contract(value = "_ -> new", pure = true)
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public static @NotNull EventNode<Event> all(@NotNull String name) {
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static @NotNull EventNode<Event> all(@NotNull String name) {
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return type(name, EventFilter.ALL);
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}
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@ -58,8 +52,8 @@ public class EventNode<T extends Event> {
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* @return A node with just an event type filter
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*/
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@Contract(value = "_, _ -> new", pure = true)
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public static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
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@NotNull EventFilter<E, V> filter) {
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static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
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@NotNull EventFilter<E, V> filter) {
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return create(name, filter, null);
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}
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@ -83,9 +77,9 @@ public class EventNode<T extends Event> {
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* @return A node with an event type filter as well as a condition on the event.
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*/
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@Contract(value = "_, _, _ -> new", pure = true)
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public static <E extends Event, V> @NotNull EventNode<E> event(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@NotNull Predicate<E> predicate) {
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static <E extends Event, V> @NotNull EventNode<E> event(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@NotNull Predicate<E> predicate) {
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return create(name, filter, (e, h) -> predicate.test(e));
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}
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@ -111,9 +105,9 @@ public class EventNode<T extends Event> {
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* @return A node with an event type filter as well as a condition on the event.
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*/
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@Contract(value = "_, _, _ -> new", pure = true)
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public static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@NotNull BiPredicate<E, V> predicate) {
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static <E extends Event, V> @NotNull EventNode<E> type(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@NotNull BiPredicate<E, V> predicate) {
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return create(name, filter, predicate);
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}
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@ -136,9 +130,9 @@ public class EventNode<T extends Event> {
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* @return A node with an event type filter as well as a condition on the event.
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*/
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@Contract(value = "_, _, _ -> new", pure = true)
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public static <E extends Event, V> @NotNull EventNode<E> value(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@NotNull Predicate<V> predicate) {
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static <E extends Event, V> @NotNull EventNode<E> value(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@NotNull Predicate<V> predicate) {
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return create(name, filter, (e, h) -> predicate.test(h));
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}
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@ -155,9 +149,9 @@ public class EventNode<T extends Event> {
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* @return A node with an event type filter as well as a handler with the provided tag
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*/
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@Contract(value = "_, _, _ -> new", pure = true)
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public static <E extends Event> @NotNull EventNode<E> tag(@NotNull String name,
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@NotNull EventFilter<E, ? extends TagReadable> filter,
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@NotNull Tag<?> tag) {
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static <E extends Event> @NotNull EventNode<E> tag(@NotNull String name,
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@NotNull EventFilter<E, ? extends TagReadable> filter,
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@NotNull Tag<?> tag) {
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return create(name, filter, (e, h) -> h.hasTag(tag));
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}
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@ -173,45 +167,18 @@ public class EventNode<T extends Event> {
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* @return A node with an event type filter as well as a handler with the provided tag
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*/
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@Contract(value = "_, _, _, _ -> new", pure = true)
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public static <E extends Event, V> @NotNull EventNode<E> tag(@NotNull String name,
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@NotNull EventFilter<E, ? extends TagReadable> filter,
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@NotNull Tag<V> tag,
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@NotNull Predicate<@Nullable V> consumer) {
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static <E extends Event, V> @NotNull EventNode<E> tag(@NotNull String name,
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@NotNull EventFilter<E, ? extends TagReadable> filter,
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@NotNull Tag<V> tag,
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@NotNull Predicate<@Nullable V> consumer) {
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return create(name, filter, (e, h) -> consumer.test(h.getTag(tag)));
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}
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private static <E extends Event, V> EventNode<E> create(@NotNull String name,
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@NotNull EventFilter<E, V> filter,
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@Nullable BiPredicate<E, V> predicate) {
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return new EventNode<>(name, filter, predicate != null ? (e, o) -> predicate.test(e, (V) o) : null);
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}
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private static final Map<Class<? extends Event>, List<EventFilter<?, ?>>> HANDLER_SUPPLIERS = new ConcurrentHashMap<>();
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private static final Object GLOBAL_CHILD_LOCK = new Object();
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private final Object lock = new Object();
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private final Map<Class<? extends T>, ListenerEntry<T>> listenerMap = new ConcurrentHashMap<>();
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private final Set<EventNode<T>> children = new CopyOnWriteArraySet<>();
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private final Set<EventInterface<T>> interfaces = new CopyOnWriteArraySet<>();
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private final Map<Object, EventNode<T>> mappedNode;
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protected final String name;
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protected final EventFilter<T, ?> filter;
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protected final BiPredicate<T, Object> predicate;
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protected final Class<T> eventType;
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private volatile int priority;
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private volatile EventNode<? super T> parent;
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protected EventNode(@NotNull String name,
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@NotNull EventFilter<T, ?> filter,
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@Nullable BiPredicate<T, Object> predicate) {
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this.name = name;
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this.filter = filter;
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this.predicate = predicate;
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this.eventType = filter.eventType();
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Cache<Object, EventNode<T>> mapCache = Caffeine.newBuilder().weakKeys().build();
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this.mappedNode = mapCache.asMap();
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//noinspection unchecked
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return new EventNodeImpl<>(name, filter, predicate != null ? (e, o) -> predicate.test(e, (V) o) : null);
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}
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/**
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@ -223,61 +190,7 @@ public class EventNode<T extends Event> {
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*
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* @param event the event to execute
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*/
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public void call(@NotNull T event) {
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final var eventClass = event.getClass();
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if (!eventType.isAssignableFrom(eventClass)) return; // Invalid event type
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// Conditions
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if (predicate != null) {
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try {
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final var value = filter.getHandler(event);
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if (!predicate.test(event, value)) return;
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} catch (Exception e) {
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MinecraftServer.getExceptionManager().handleException(e);
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return;
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}
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}
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// Event interfaces
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if (!interfaces.isEmpty()) {
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this.interfaces.forEach(eventInterface -> {
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if (!eventInterface.eventTypes().contains(eventClass)) return;
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eventInterface.call(event);
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});
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}
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// Mapped listeners
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if (!mappedNode.isEmpty()) {
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// Check mapped listeners for each individual event handler
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getEventFilters(eventClass).forEach(filter -> {
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final var handler = filter.castHandler(event);
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final var map = mappedNode.get(handler);
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if (map != null) map.call(event);
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});
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}
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// Process listener list
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final var entry = listenerMap.get(eventClass);
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if (entry == null) return; // No listener nor children
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final var listeners = entry.listeners;
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if (!listeners.isEmpty()) {
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for (EventListener<T> listener : listeners) {
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EventListener.Result result;
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try {
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result = listener.run(event);
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} catch (Exception e) {
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result = EventListener.Result.EXCEPTION;
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MinecraftServer.getExceptionManager().handleException(e);
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}
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if (result == EventListener.Result.EXPIRED) {
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listeners.remove(listener);
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}
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}
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}
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// Process children
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if (entry.childCount > 0) {
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this.children.stream()
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.sorted(Comparator.comparing(EventNode::getPriority))
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.forEach(child -> child.call(event));
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}
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}
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void call(@NotNull T event);
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/**
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* Execute a cancellable event with a callback to execute if the event is successful.
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@ -286,7 +199,7 @@ public class EventNode<T extends Event> {
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* @param event The event to execute
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* @param successCallback A callback if the event is not cancelled
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*/
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public void callCancellable(@NotNull T event, @NotNull Runnable successCallback) {
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default void callCancellable(@NotNull T event, @NotNull Runnable successCallback) {
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call(event);
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if (!(event instanceof CancellableEvent) || !((CancellableEvent) event).isCancelled()) {
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successCallback.run();
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@ -294,25 +207,19 @@ public class EventNode<T extends Event> {
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}
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@Contract(pure = true)
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public @NotNull String getName() {
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return name;
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}
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@NotNull Class<T> getEventType();
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@Contract(pure = true)
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public int getPriority() {
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return priority;
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}
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@NotNull String getName();
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@Contract(pure = true)
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int getPriority();
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@Contract(value = "_ -> this")
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public @NotNull EventNode<T> setPriority(int priority) {
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this.priority = priority;
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return this;
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}
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@NotNull EventNode<T> setPriority(int priority);
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@Contract(pure = true)
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public @Nullable EventNode<? super T> getParent() {
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return parent;
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}
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@Nullable EventNode<? super T> getParent();
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/**
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* Returns an unmodifiable view of the children in this node.
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@ -321,9 +228,7 @@ public class EventNode<T extends Event> {
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* @see #removeChild(EventNode)
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*/
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@Contract(pure = true)
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public @NotNull Set<@NotNull EventNode<T>> getChildren() {
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return Collections.unmodifiableSet(children);
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}
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@NotNull Set<@NotNull EventNode<T>> getChildren();
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/**
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* Locates all child nodes with the given name and event type recursively starting at this node.
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@ -333,19 +238,7 @@ public class EventNode<T extends Event> {
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* @return All matching event nodes
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*/
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@Contract(pure = true)
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public <E extends T> @NotNull List<EventNode<E>> findChildren(@NotNull String name, Class<E> eventType) {
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if (children.isEmpty()) return Collections.emptyList();
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synchronized (GLOBAL_CHILD_LOCK) {
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List<EventNode<E>> result = new ArrayList<>();
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for (EventNode<T> child : children) {
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if (EventNode.equals(child, name, eventType)) {
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result.add((EventNode<E>) child);
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}
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result.addAll(child.findChildren(name, eventType));
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}
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return result;
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}
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}
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<E extends T> @NotNull List<EventNode<E>> findChildren(@NotNull String name, Class<E> eventType);
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/**
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* Locates all child nodes with the given name and event type recursively starting at this node.
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@ -354,8 +247,8 @@ public class EventNode<T extends Event> {
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* @return All matching event nodes
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*/
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@Contract(pure = true)
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public @NotNull List<EventNode<T>> findChildren(@NotNull String name) {
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return findChildren(name, eventType);
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default @NotNull List<EventNode<T>> findChildren(@NotNull String name) {
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return findChildren(name, getEventType());
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}
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/**
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@ -367,19 +260,7 @@ public class EventNode<T extends Event> {
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* @param eventType The event node type to filter for
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* @param eventNode The replacement node
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*/
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public <E extends T> void replaceChildren(@NotNull String name, @NotNull Class<E> eventType, @NotNull EventNode<E> eventNode) {
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if (children.isEmpty()) return;
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synchronized (GLOBAL_CHILD_LOCK) {
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for (EventNode<T> child : children) {
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if (EventNode.equals(child, name, eventType)) {
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removeChild(child);
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addChild(eventNode);
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continue;
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}
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child.replaceChildren(name, eventType, eventNode);
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}
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}
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}
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<E extends T> void replaceChildren(@NotNull String name, @NotNull Class<E> eventType, @NotNull EventNode<E> eventNode);
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/**
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* Replaces all children matching the given name and type recursively starting from this node.
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@ -389,8 +270,8 @@ public class EventNode<T extends Event> {
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* @param name The node name to filter for
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* @param eventNode The replacement node
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*/
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public void replaceChildren(@NotNull String name, @NotNull EventNode<T> eventNode) {
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replaceChildren(name, eventType, eventNode);
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default void replaceChildren(@NotNull String name, @NotNull EventNode<T> eventNode) {
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replaceChildren(name, getEventType(), eventNode);
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}
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/**
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@ -399,27 +280,14 @@ public class EventNode<T extends Event> {
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* @param name The node name to filter for
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* @param eventType The node type to filter for
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*/
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public void removeChildren(@NotNull String name, @NotNull Class<? extends T> eventType) {
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if (children.isEmpty()) return;
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synchronized (GLOBAL_CHILD_LOCK) {
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for (EventNode<T> child : children) {
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if (EventNode.equals(child, name, eventType)) {
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removeChild(child);
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continue;
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}
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child.removeChildren(name, eventType);
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}
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}
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}
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void removeChildren(@NotNull String name, @NotNull Class<? extends T> eventType);
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/**
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* Recursively removes children with the given name starting at this node.
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*
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* @param name The node name to filter for
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*/
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public void removeChildren(@NotNull String name) {
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removeChildren(name, eventType);
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}
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void removeChildren(@NotNull String name);
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/**
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* Directly adds a child node to this node.
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@ -428,26 +296,7 @@ public class EventNode<T extends Event> {
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* @return this, can be used for chaining
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*/
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@Contract(value = "_ -> this")
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public @NotNull EventNode<T> addChild(@NotNull EventNode<? extends T> child) {
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synchronized (GLOBAL_CHILD_LOCK) {
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Check.stateCondition(child.parent != null, "Node already has a parent");
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Check.stateCondition(Objects.equals(parent, child), "Cannot have a child as parent");
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final boolean result = this.children.add((EventNode<T>) child);
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if (result) {
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child.parent = this;
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// Increase listener count
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synchronized (lock) {
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child.listenerMap.forEach((eventClass, eventListeners) -> {
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final var entry = child.listenerMap.get(eventClass);
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if (entry == null) return;
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final int childCount = entry.listeners.size() + entry.childCount;
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increaseChildListenerCount(eventClass, childCount);
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});
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}
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}
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}
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return this;
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}
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@NotNull EventNode<T> addChild(@NotNull EventNode<? extends T> child);
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/**
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* Directly removes the given child from this node.
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@ -456,135 +305,20 @@ public class EventNode<T extends Event> {
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* @return this, can be used for chaining
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*/
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@Contract(value = "_ -> this")
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public @NotNull EventNode<T> removeChild(@NotNull EventNode<? extends T> child) {
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synchronized (GLOBAL_CHILD_LOCK) {
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final boolean result = this.children.remove(child);
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if (result) {
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child.parent = null;
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// Decrease listener count
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synchronized (lock) {
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child.listenerMap.forEach((eventClass, eventListeners) -> {
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final var entry = child.listenerMap.get(eventClass);
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if (entry == null)
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return;
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final int childCount = entry.listeners.size() + entry.childCount;
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decreaseChildListenerCount(eventClass, childCount);
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});
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}
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}
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}
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return this;
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}
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@NotNull EventNode<T> removeChild(@NotNull EventNode<? extends T> child);
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@Contract(value = "_ -> this")
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public @NotNull EventNode<T> addListener(@NotNull EventListener<? extends T> listener) {
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synchronized (GLOBAL_CHILD_LOCK) {
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final var eventType = listener.getEventType();
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var entry = listenerMap.computeIfAbsent(eventType, aClass -> new ListenerEntry<>());
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entry.listeners.add((EventListener<T>) listener);
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if (parent != null) {
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synchronized (parent.lock) {
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parent.increaseChildListenerCount(eventType, 1);
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}
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}
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}
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return this;
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}
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@NotNull EventNode<T> addListener(@NotNull EventListener<? extends T> listener);
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||||
|
||||
@Contract(value = "_, _ -> this")
|
||||
public <E extends T> @NotNull EventNode<T> addListener(@NotNull Class<E> eventType, @NotNull Consumer<@NotNull E> listener) {
|
||||
return addListener(EventListener.of(eventType, listener));
|
||||
}
|
||||
<E extends T> @NotNull EventNode<T> addListener(@NotNull Class<E> eventType, @NotNull Consumer<@NotNull E> listener);
|
||||
|
||||
@Contract(value = "_ -> this")
|
||||
public @NotNull EventNode<T> removeListener(@NotNull EventListener<? extends T> listener) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
final var eventType = listener.getEventType();
|
||||
var entry = listenerMap.get(eventType);
|
||||
if (entry == null) return this;
|
||||
var listeners = entry.listeners;
|
||||
final boolean removed = listeners.remove(listener);
|
||||
if (removed && parent != null) {
|
||||
synchronized (parent.lock) {
|
||||
parent.decreaseChildListenerCount(eventType, 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
return this;
|
||||
}
|
||||
@NotNull EventNode<T> removeListener(@NotNull EventListener<? extends T> listener);
|
||||
|
||||
public void map(@NotNull EventNode<? extends T> node, @NotNull Object value) {
|
||||
final var nodeType = node.eventType;
|
||||
final var valueType = value.getClass();
|
||||
final boolean correct = getEventFilters(nodeType).stream().anyMatch(eventFilter -> {
|
||||
final var handlerType = eventFilter.handlerType();
|
||||
return handlerType != null && handlerType.isAssignableFrom(valueType);
|
||||
});
|
||||
Check.stateCondition(!correct, "The node filter {0} is not compatible with type {1}", nodeType, valueType);
|
||||
//noinspection unchecked
|
||||
this.mappedNode.put(value, (EventNode<T>) node);
|
||||
}
|
||||
void map(@NotNull EventNode<? extends T> node, @NotNull Object value);
|
||||
|
||||
public boolean unmap(@NotNull Object value) {
|
||||
return mappedNode.remove(value) != null;
|
||||
}
|
||||
boolean unmap(@NotNull Object value);
|
||||
|
||||
public void registerInterface(@NotNull EventInterface<? extends T> eventInterface) {
|
||||
this.interfaces.add((EventInterface<T>) eventInterface);
|
||||
}
|
||||
|
||||
private void increaseChildListenerCount(Class<? extends T> eventClass, int count) {
|
||||
var entry = listenerMap.computeIfAbsent(eventClass, aClass -> new ListenerEntry<>());
|
||||
ListenerEntry.addAndGet(entry, count);
|
||||
if (parent != null) {
|
||||
parent.increaseChildListenerCount(eventClass, count);
|
||||
}
|
||||
}
|
||||
|
||||
private void decreaseChildListenerCount(Class<? extends T> eventClass, int count) {
|
||||
var entry = listenerMap.computeIfAbsent(eventClass, aClass -> new ListenerEntry<>());
|
||||
final int result = ListenerEntry.addAndGet(entry, -count);
|
||||
if (result == 0 && entry.listeners.isEmpty()) {
|
||||
this.listenerMap.remove(eventClass);
|
||||
} else if (result < 0) {
|
||||
throw new IllegalStateException("Something wrong happened, listener count: " + result);
|
||||
}
|
||||
if (parent != null) {
|
||||
parent.decreaseChildListenerCount(eventClass, count);
|
||||
}
|
||||
}
|
||||
|
||||
private static boolean equals(EventNode<?> node, String name, Class<?> eventType) {
|
||||
final boolean nameCheck = node.getName().equals(name);
|
||||
final boolean typeCheck = eventType.isAssignableFrom(node.eventType);
|
||||
return nameCheck && typeCheck;
|
||||
}
|
||||
|
||||
private static final List<EventFilter<? extends Event, ?>> FILTERS = List.of(
|
||||
EventFilter.ENTITY,
|
||||
EventFilter.ITEM, EventFilter.INSTANCE,
|
||||
EventFilter.INVENTORY, EventFilter.BLOCK);
|
||||
|
||||
/**
|
||||
* Returns a list of (event->object) functions used to retrieve handler.
|
||||
* For example `PlayerUseItemEvent` should return a function to retrieve the player,
|
||||
* and another for the item.
|
||||
* Event traits are currently hardcoded.
|
||||
*/
|
||||
private static List<EventFilter<?, ?>> getEventFilters(Class<? extends Event> eventType) {
|
||||
return HANDLER_SUPPLIERS.computeIfAbsent(eventType, clazz ->
|
||||
FILTERS.stream().filter(eventFilter -> eventFilter.eventType().isAssignableFrom(clazz)).collect(Collectors.toList()));
|
||||
}
|
||||
|
||||
private static class ListenerEntry<T extends Event> {
|
||||
private static final AtomicIntegerFieldUpdater<ListenerEntry> CHILD_UPDATER =
|
||||
AtomicIntegerFieldUpdater.newUpdater(ListenerEntry.class, "childCount");
|
||||
|
||||
List<EventListener<T>> listeners = new CopyOnWriteArrayList<>();
|
||||
volatile int childCount;
|
||||
|
||||
private static int addAndGet(ListenerEntry<?> entry, int add) {
|
||||
return CHILD_UPDATER.addAndGet(entry, add);
|
||||
}
|
||||
}
|
||||
void registerInterface(@NotNull EventInterface<? extends T> eventInterface);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,356 @@
|
|||
package net.minestom.server.event;
|
||||
|
||||
import net.minestom.server.MinecraftServer;
|
||||
import net.minestom.server.utils.validate.Check;
|
||||
import org.jetbrains.annotations.Contract;
|
||||
import org.jetbrains.annotations.NotNull;
|
||||
import org.jetbrains.annotations.Nullable;
|
||||
|
||||
import java.util.*;
|
||||
import java.util.concurrent.ConcurrentHashMap;
|
||||
import java.util.concurrent.CopyOnWriteArrayList;
|
||||
import java.util.concurrent.CopyOnWriteArraySet;
|
||||
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
|
||||
import java.util.function.BiPredicate;
|
||||
import java.util.function.Consumer;
|
||||
import java.util.function.IntUnaryOperator;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
class EventNodeImpl<T extends Event> implements EventNode<T> {
|
||||
private static final Object GLOBAL_CHILD_LOCK = new Object();
|
||||
private final Object lock = new Object();
|
||||
|
||||
private final Map<Class<? extends T>, ListenerEntry<T>> listenerMap = new ConcurrentHashMap<>();
|
||||
private final Set<EventNode<T>> children = new CopyOnWriteArraySet<>();
|
||||
private final Map<Object, ListenerEntry<T>> mappedNodeCache = new WeakHashMap<>();
|
||||
|
||||
private final String name;
|
||||
private final EventFilter<T, ?> filter;
|
||||
private final BiPredicate<T, Object> predicate;
|
||||
private final Class<T> eventType;
|
||||
private volatile int priority;
|
||||
private volatile EventNodeImpl<? super T> parent;
|
||||
|
||||
protected EventNodeImpl(@NotNull String name,
|
||||
@NotNull EventFilter<T, ?> filter,
|
||||
@Nullable BiPredicate<T, Object> predicate) {
|
||||
this.name = name;
|
||||
this.filter = filter;
|
||||
this.predicate = predicate;
|
||||
this.eventType = filter.eventType();
|
||||
}
|
||||
|
||||
@Override
|
||||
public void call(@NotNull T event) {
|
||||
final var eventClass = event.getClass();
|
||||
if (!eventType.isAssignableFrom(eventClass)) return; // Invalid event type
|
||||
// Conditions
|
||||
if (predicate != null) {
|
||||
try {
|
||||
final var value = filter.getHandler(event);
|
||||
if (!predicate.test(event, value)) return;
|
||||
} catch (Exception e) {
|
||||
MinecraftServer.getExceptionManager().handleException(e);
|
||||
return;
|
||||
}
|
||||
}
|
||||
// Process listeners list
|
||||
final var entry = listenerMap.get(eventClass);
|
||||
if (entry == null) return; // No listener nor children
|
||||
{
|
||||
// Event interfaces
|
||||
final var interfaces = entry.interfaces;
|
||||
if (!interfaces.isEmpty()) {
|
||||
for (EventInterface<T> inter : interfaces) {
|
||||
if (!inter.eventTypes().contains(eventClass)) continue;
|
||||
inter.call(event);
|
||||
}
|
||||
}
|
||||
// Mapped listeners
|
||||
final var mapped = entry.mappedNode;
|
||||
if (!mapped.isEmpty()) {
|
||||
synchronized (mappedNodeCache) {
|
||||
if (!mapped.isEmpty()) {
|
||||
// Check mapped listeners for each individual event handler
|
||||
for (var filter : entry.filters) {
|
||||
final var handler = filter.castHandler(event);
|
||||
final var map = mapped.get(handler);
|
||||
if (map != null) map.call(event);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// Basic listeners
|
||||
final var listeners = entry.listeners;
|
||||
if (!listeners.isEmpty()) {
|
||||
for (EventListener<T> listener : listeners) {
|
||||
EventListener.Result result;
|
||||
try {
|
||||
result = listener.run(event);
|
||||
} catch (Exception e) {
|
||||
result = EventListener.Result.EXCEPTION;
|
||||
MinecraftServer.getExceptionManager().handleException(e);
|
||||
}
|
||||
if (result == EventListener.Result.EXPIRED) {
|
||||
listeners.remove(listener);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// Process children
|
||||
if (entry.childCount > 0) {
|
||||
this.children.stream()
|
||||
.sorted(Comparator.comparing(EventNode::getPriority))
|
||||
.forEach(child -> child.call(event));
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public <E extends T> @NotNull List<EventNode<E>> findChildren(@NotNull String name, Class<E> eventType) {
|
||||
if (children.isEmpty()) return Collections.emptyList();
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
List<EventNode<E>> result = new ArrayList<>();
|
||||
for (EventNode<T> child : children) {
|
||||
if (equals(child, name, eventType)) {
|
||||
result.add((EventNode<E>) child);
|
||||
}
|
||||
result.addAll(child.findChildren(name, eventType));
|
||||
}
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
@Contract(pure = true)
|
||||
public @NotNull Set<@NotNull EventNode<T>> getChildren() {
|
||||
return Collections.unmodifiableSet(children);
|
||||
}
|
||||
|
||||
@Override
|
||||
public <E extends T> void replaceChildren(@NotNull String name, @NotNull Class<E> eventType, @NotNull EventNode<E> eventNode) {
|
||||
if (children.isEmpty()) return;
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
for (EventNode<T> child : children) {
|
||||
if (equals(child, name, eventType)) {
|
||||
removeChild(child);
|
||||
addChild(eventNode);
|
||||
continue;
|
||||
}
|
||||
child.replaceChildren(name, eventType, eventNode);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void removeChildren(@NotNull String name, @NotNull Class<? extends T> eventType) {
|
||||
if (children.isEmpty()) return;
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
for (EventNode<T> child : children) {
|
||||
if (equals(child, name, eventType)) {
|
||||
removeChild(child);
|
||||
continue;
|
||||
}
|
||||
child.removeChildren(name, eventType);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void removeChildren(@NotNull String name) {
|
||||
removeChildren(name, eventType);
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull EventNode<T> addChild(@NotNull EventNode<? extends T> child) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
final var childImpl = (EventNodeImpl<? extends T>) child;
|
||||
Check.stateCondition(childImpl.parent != null, "Node already has a parent");
|
||||
Check.stateCondition(Objects.equals(parent, child), "Cannot have a child as parent");
|
||||
final boolean result = this.children.add((EventNodeImpl<T>) childImpl);
|
||||
if (result) {
|
||||
childImpl.parent = this;
|
||||
// Increase listener count
|
||||
propagateNode(childImpl, IntUnaryOperator.identity());
|
||||
}
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull EventNode<T> removeChild(@NotNull EventNode<? extends T> child) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
final boolean result = this.children.remove(child);
|
||||
if (result) {
|
||||
final var childImpl = (EventNodeImpl<? extends T>) child;
|
||||
childImpl.parent = null;
|
||||
// Decrease listener count
|
||||
propagateNode(childImpl, count -> -count);
|
||||
}
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull EventNode<T> addListener(@NotNull EventListener<? extends T> listener) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
final var eventType = listener.getEventType();
|
||||
var entry = getEntry(eventType);
|
||||
entry.listeners.add((EventListener<T>) listener);
|
||||
final var parent = this.parent;
|
||||
if (parent != null) {
|
||||
synchronized (parent.lock) {
|
||||
parent.propagateChildCountChange(eventType, 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
@Override
|
||||
public <E extends T> @NotNull EventNode<T> addListener(@NotNull Class<E> eventType, @NotNull Consumer<@NotNull E> listener) {
|
||||
return addListener(EventListener.of(eventType, listener));
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull EventNode<T> removeListener(@NotNull EventListener<? extends T> listener) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
final var eventType = listener.getEventType();
|
||||
var entry = listenerMap.get(eventType);
|
||||
if (entry == null) return this;
|
||||
var listeners = entry.listeners;
|
||||
final boolean removed = listeners.remove(listener);
|
||||
if (removed && parent != null) {
|
||||
synchronized (parent.lock) {
|
||||
parent.propagateChildCountChange(eventType, -1);
|
||||
}
|
||||
}
|
||||
}
|
||||
return this;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void map(@NotNull EventNode<? extends T> node, @NotNull Object value) {
|
||||
final var nodeImpl = (EventNodeImpl<? extends T>) node;
|
||||
final var nodeType = nodeImpl.eventType;
|
||||
final var valueType = value.getClass();
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
nodeImpl.listenerMap.forEach((type, listenerEntry) -> {
|
||||
final var entry = getEntry(type);
|
||||
final boolean correct = entry.filters.stream().anyMatch(eventFilter -> {
|
||||
final var handlerType = eventFilter.handlerType();
|
||||
return handlerType != null && handlerType.isAssignableFrom(valueType);
|
||||
});
|
||||
Check.stateCondition(!correct, "The node filter {0} is not compatible with type {1}", nodeType, valueType);
|
||||
synchronized (mappedNodeCache) {
|
||||
entry.mappedNode.put(value, (EventNode<T>) node);
|
||||
mappedNodeCache.put(value, entry);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean unmap(@NotNull Object value) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
synchronized (mappedNodeCache) {
|
||||
var entry = mappedNodeCache.remove(value);
|
||||
if (entry == null) return false;
|
||||
return entry.mappedNode.remove(value) != null;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void registerInterface(@NotNull EventInterface<? extends T> eventInterface) {
|
||||
synchronized (GLOBAL_CHILD_LOCK) {
|
||||
for (var eventType : eventInterface.eventTypes()) {
|
||||
var entry = getEntry((Class<? extends T>) eventType);
|
||||
entry.interfaces.add((EventInterface<T>) eventInterface);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull Class<T> getEventType() {
|
||||
return eventType;
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int getPriority() {
|
||||
return priority;
|
||||
}
|
||||
|
||||
@Override
|
||||
public @NotNull EventNode<T> setPriority(int priority) {
|
||||
this.priority = priority;
|
||||
return this;
|
||||
}
|
||||
|
||||
@Override
|
||||
public @Nullable EventNode<? super T> getParent() {
|
||||
return parent;
|
||||
}
|
||||
|
||||
private void propagateChildCountChange(Class<? extends T> eventClass, int count) {
|
||||
var entry = getEntry(eventClass);
|
||||
final int result = ListenerEntry.addAndGet(entry, count);
|
||||
if (result == 0 && entry.listeners.isEmpty()) {
|
||||
this.listenerMap.remove(eventClass);
|
||||
} else if (result < 0) {
|
||||
throw new IllegalStateException("Something wrong happened, listener count: " + result);
|
||||
}
|
||||
if (parent != null) {
|
||||
parent.propagateChildCountChange(eventClass, count);
|
||||
}
|
||||
}
|
||||
|
||||
private void propagateNode(EventNodeImpl<? extends T> child, IntUnaryOperator operator) {
|
||||
synchronized (lock) {
|
||||
final var listeners = child.listenerMap;
|
||||
listeners.forEach((eventClass, eventListeners) -> {
|
||||
final var entry = listeners.get(eventClass);
|
||||
if (entry == null) return;
|
||||
final int childCount = entry.listeners.size() + entry.childCount;
|
||||
propagateChildCountChange(eventClass, operator.applyAsInt(childCount));
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
private ListenerEntry<T> getEntry(Class<? extends T> type) {
|
||||
return listenerMap.computeIfAbsent(type, aClass -> new ListenerEntry<>((Class<T>) aClass));
|
||||
}
|
||||
|
||||
private static boolean equals(EventNode<?> node, String name, Class<?> eventType) {
|
||||
final boolean nameCheck = node.getName().equals(name);
|
||||
final boolean typeCheck = eventType.isAssignableFrom(((EventNodeImpl<?>) node).eventType);
|
||||
return nameCheck && typeCheck;
|
||||
}
|
||||
|
||||
private static class ListenerEntry<T extends Event> {
|
||||
private static final List<EventFilter<? extends Event, ?>> FILTERS = List.of(
|
||||
EventFilter.ENTITY,
|
||||
EventFilter.ITEM, EventFilter.INSTANCE,
|
||||
EventFilter.INVENTORY, EventFilter.BLOCK);
|
||||
@SuppressWarnings("rawtypes")
|
||||
private static final AtomicIntegerFieldUpdater<ListenerEntry> CHILD_UPDATER =
|
||||
AtomicIntegerFieldUpdater.newUpdater(ListenerEntry.class, "childCount");
|
||||
|
||||
final List<EventFilter<?, ?>> filters;
|
||||
final List<EventListener<T>> listeners = new CopyOnWriteArrayList<>();
|
||||
final Set<EventInterface<T>> interfaces = new CopyOnWriteArraySet<>();
|
||||
final Map<Object, EventNode<T>> mappedNode = new WeakHashMap<>();
|
||||
volatile int childCount;
|
||||
|
||||
ListenerEntry(Class<T> eventType) {
|
||||
this.filters = FILTERS.stream().filter(eventFilter -> eventFilter.eventType().isAssignableFrom(eventType)).collect(Collectors.toList());
|
||||
}
|
||||
|
||||
private static int addAndGet(ListenerEntry<?> entry, int add) {
|
||||
return CHILD_UPDATER.addAndGet(entry, add);
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue