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Merge pull request #4 from HaHaWTH/main
General cb performance improvement & dumpitem command
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69 changes: 69 additions & 0 deletions
69
src/main/java/catserver/server/executor/hiddenclass/BukkitEventExecutorFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package catserver.server.executor.hiddenclass; | ||
|
|
||
| import org.bukkit.event.Event; | ||
| import org.bukkit.event.Listener; | ||
| import org.bukkit.plugin.EventExecutor; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.lang.constant.ConstantDescs; | ||
| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.lang.invoke.MethodType; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Modifier; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
|
|
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| public final class BukkitEventExecutorFactory { | ||
| private static final byte[] TEMPLATE_CLASS_BYTES; | ||
|
|
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| static { | ||
| try (final InputStream is = BukkitEventExecutorFactory.class.getResourceAsStream("MethodHandleEventExecutorTemplate.class")) { | ||
| TEMPLATE_CLASS_BYTES = Objects.requireNonNull(is, "template class is missing").readAllBytes(); | ||
| } catch (IOException e) { | ||
| throw new AssertionError(e); | ||
| } | ||
| } | ||
|
|
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| private BukkitEventExecutorFactory() { | ||
| } | ||
|
|
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| /** | ||
| * @return an {@link EventExecutor} implemented by a hidden class calling a method handle | ||
| * | ||
| * @param method the method to be invoked by the created event executor | ||
| * @param eventClass the class of the event to handle | ||
| */ | ||
| public static EventExecutor create(final Method method, final Class<? extends Event> eventClass) { | ||
| final List<?> classData = List.of(method, eventClass); | ||
| try { | ||
| final MethodHandles.Lookup newClass = MethodHandles.lookup().defineHiddenClassWithClassData(TEMPLATE_CLASS_BYTES, classData, true); | ||
| return newClass.lookupClass().asSubclass(EventExecutor.class).getDeclaredConstructor().newInstance(); | ||
| } catch (ReflectiveOperationException e) { | ||
| throw new AssertionError(e); | ||
| } | ||
| } | ||
|
|
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| record ClassData(Method method, MethodHandle methodHandle, Class<? extends Event> eventClass) { | ||
|
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| } | ||
|
|
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| /** | ||
| * Extracts the class data and creates an adjusted MethodHandle directly usable by the lookup class. | ||
| * The logic is kept here to minimize memory usage per created class. | ||
| */ | ||
| static ClassData classData(final MethodHandles.Lookup lookup) { | ||
| try { | ||
| final Method method = MethodHandles.classDataAt(lookup, ConstantDescs.DEFAULT_NAME, Method.class, 0); | ||
| MethodHandle mh = lookup.unreflect(method); | ||
| if (Modifier.isStatic(method.getModifiers())) { | ||
| mh = MethodHandles.dropArguments(mh, 0, Listener.class); | ||
| } | ||
| mh = mh.asType(MethodType.methodType(void.class, Listener.class, Event.class)); | ||
| final Class<?> eventClass = MethodHandles.classDataAt(lookup, ConstantDescs.DEFAULT_NAME, Class.class, 1); | ||
| return new ClassData(method, mh, eventClass.asSubclass(Event.class)); | ||
| } catch (ReflectiveOperationException e) { | ||
| throw new AssertionError(e); | ||
| } | ||
| } | ||
| } |
53 changes: 53 additions & 0 deletions
53
src/main/java/catserver/server/executor/hiddenclass/MethodHandleEventExecutorTemplate.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package catserver.server.executor.hiddenclass; | ||
|
|
||
| import org.bukkit.event.Event; | ||
| import org.bukkit.event.EventException; | ||
| import org.bukkit.event.Listener; | ||
| import org.bukkit.plugin.EventExecutor; | ||
| import org.spigotmc.SneakyThrow; | ||
|
|
||
| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.MethodHandles; | ||
| import java.lang.reflect.Method; | ||
|
|
||
| /** | ||
| * This class is designed to be used as hidden class template. | ||
| * Initializing the class directly will fail due to missing {@code classData}. | ||
| * Instead, {@link java.lang.invoke.MethodHandles.Lookup#defineHiddenClassWithClassData(byte[], Object, boolean, MethodHandles.Lookup.ClassOption...)} | ||
| * must be used, with the {@code classData} object being a list consisting of two elements: | ||
| * <ol> | ||
| * <li>A {@link Method} representing the event handler method</li> | ||
| * <li>A {@link Class} representing the event type</li> | ||
| * </ol> | ||
| * The method must take {@link Event} or a subtype of it as its single parameter. | ||
| * If the method is non-static, it also needs to reside in a class implementing {@link Listener}. | ||
| */ | ||
| @SuppressWarnings("unused") | ||
| class MethodHandleEventExecutorTemplate implements EventExecutor { | ||
| private static final Method METHOD; | ||
| private static final MethodHandle HANDLE; | ||
| private static final Class<? extends Event> EVENT_CLASS; | ||
|
|
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| static { | ||
| final MethodHandles.Lookup lookup = MethodHandles.lookup(); | ||
| final BukkitEventExecutorFactory.ClassData classData = BukkitEventExecutorFactory.classData(lookup); | ||
| METHOD = classData.method(); | ||
| HANDLE = classData.methodHandle(); | ||
| EVENT_CLASS = classData.eventClass(); | ||
| } | ||
|
|
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| @Override | ||
| public void execute(final Listener listener, final Event event) throws EventException { | ||
| if (!EVENT_CLASS.isInstance(event)) return; | ||
| try { | ||
| HANDLE.invokeExact(listener, event); | ||
| } catch (Throwable t) { | ||
| SneakyThrow.sneaky(t); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public String toString() { | ||
| return "MethodHandleEventExecutorTemplate['" + METHOD + "']"; | ||
| } | ||
| } |
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