Add the bulk of the work for returning task data from events.

Credit: kiip1 for suggestion and example.

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.byteskript</groupId>
     <artifactId>byteskript</artifactId>
-    <version>1.0.34</version>
+    <version>1.0.35</version>
     <name>ByteSkript</name>
     <description>A compiled JVM implementation of the Skript language.</description>
 

src/main/java/org/byteskript/skript/runtime/Skript.java

@@ -24,6 +24,7 @@
 import org.byteskript.skript.runtime.internal.*;
 import org.byteskript.skript.runtime.threading.*;
 import org.byteskript.skript.runtime.type.Converter;
+import org.byteskript.skript.runtime.type.EventData;
 import org.byteskript.skript.runtime.type.OperatorFunction;
 
 import java.io.*;
@@ -463,15 +464,15 @@ public Future<?> runScript(final ScriptRunner runner, final Event event) {
         final Runnable runnable = () -> {
             final ScriptThread thread = (ScriptThread) Thread.currentThread();
             future.thread = thread;
-            thread.variables.clear();
+            thread.variables.clear(); // Some threads get regurgitated and will have shadow variables from their previous run.
             thread.initiator = runner.owner();
             thread.event = event;
             try {
                 runner.run();
-                future.value(runner.result());
             } catch (ThreadDeath ignore) {
-                // This is likely from an exit the current process effect, we don't want to make noise
+                // This is likely from an exit the current process effect, we don't want to make noise.
             } finally {
+                future.value(runner.result());
                 future.finish();
             }
         };
@@ -485,15 +486,16 @@ public Future<?> runScript(final ScriptRunner runner, final Event event) {
         This will trigger only the given script.
         """)
     @GenerateExample
-    public boolean runEvent(final Event event, final Script script) {
+    public EventData<?> runEvent(final Event event, final Script script) {
         boolean run = false;
+        final List<ScriptFinishFuture> futures = new ArrayList<>();
         for (Map.Entry<Class<? extends Event>, EventHandler> entry : events.entrySet()) {
             final Class<? extends Event> key = entry.getKey();
             if (!key.isAssignableFrom(event.getClass())) continue;
             run = true;
-            entry.getValue().run(this, event, script);
+            futures.addAll(Arrays.asList(entry.getValue().run(this, event, script)));
         }
-        return run;
+        return new EventData<>(run, event, futures.toArray(new ScriptFinishFuture[0]));
     }
 
     @Description("""
@@ -777,15 +779,16 @@ public void unloadScript(Script script) {
         Each handler will spawn its own process.
         """)
     @GenerateExample
-    public boolean runEvent(final Event event) {
+    public EventData<?> runEvent(final Event event) {
         boolean run = false;
+        final List<ScriptFinishFuture> futures = new ArrayList<>();
         for (Map.Entry<Class<? extends Event>, EventHandler> entry : events.entrySet()) {
             final Class<? extends Event> key = entry.getKey();
             if (!key.isAssignableFrom(event.getClass())) continue;
             run = true;
-            entry.getValue().run(this, event);
+            futures.addAll(Arrays.asList(entry.getValue().run(this, event)));
         }
-        return run;
+        return new EventData<>(run, event, futures.toArray(new ScriptFinishFuture[0]));
     }
 
     @Description("""

src/main/java/org/byteskript/skript/runtime/internal/EventHandler.java

@@ -10,10 +10,12 @@
 import org.byteskript.skript.api.Event;
 import org.byteskript.skript.runtime.Script;
 import org.byteskript.skript.runtime.Skript;
+import org.byteskript.skript.runtime.threading.ScriptFinishFuture;
 import org.byteskript.skript.runtime.threading.ScriptRunner;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.Future;
 
 @Ignore
 public class EventHandler {
@@ -24,21 +26,38 @@ public List<ScriptRunner> getTriggers() {
         return triggers;
     }
 
-    public void run(final Skript skript, final Event event) {
-        for (final ScriptRunner trigger : triggers) {
-            skript.runScript(trigger, event);
+    public ScriptFinishFuture[] run(final Skript skript, final Event event) {
+        final ScriptFinishFuture[] futures = new ScriptFinishFuture[triggers.size()];
+        int count = 0;
+        synchronized (triggers) { // Reduce the chance of comodification.
+            for (final ScriptRunner trigger : triggers) {
+                futures[count] = (ScriptFinishFuture) skript.runScript(trigger, event);
+                assert futures[count] != null: "Script trigger didn't produce a task.";
+                count++;
+            }
         }
+        return futures;
     }
 
-    public void run(final Skript skript, final Event event, final Script script) {
-        for (final ScriptRunner trigger : triggers) {
-            if (trigger.owner() == script.mainClass())
-                skript.runScript(trigger, event);
+    public ScriptFinishFuture[] run(final Skript skript, final Event event, final Script script) {
+        int count = 0;
+        synchronized (triggers) {
+            final List<ScriptRunner> triggers = new ArrayList<>(this.triggers);
+            triggers.removeIf(trigger -> trigger.owner() != script.mainClass());
+            final ScriptFinishFuture[] futures = new ScriptFinishFuture[triggers.size()];
+            for (final ScriptRunner trigger : triggers) {
+                futures[count] = (ScriptFinishFuture) skript.runScript(trigger, event);
+                assert futures[count] != null: "Script trigger didn't produce a task.";
+                count++;
+            }
+            return futures;
         }
     }
 
     public void add(final ScriptRunner runner) {
-        this.triggers.add(runner);
+        synchronized (triggers) {
+            this.triggers.add(runner);
+        }
     }
 
 }

src/main/java/org/byteskript/skript/runtime/threading/ScriptFinishFuture.java

@@ -13,28 +13,31 @@
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
+import java.util.function.Supplier;
 
-public class ScriptFinishFuture implements Future<Object> {
+public class ScriptFinishFuture implements Supplier<Object>, Future<Object> {
 
     private final Skript skript;
     private final Object lock = new Object();
+    private boolean done;
     public ScriptThread thread;
     protected Object value;
 
     public ScriptFinishFuture(Skript skript) {
         this.skript = skript;
     }
 
-    public void value(Object object) {
-        synchronized (this) {
-            this.value = object;
-        }
+    public synchronized void value(Object object) {
+        this.value = object;
     }
 
     public void finish() {
         synchronized (lock) {
             lock.notify();
         }
+        synchronized (this) {
+            this.done = true;
+        }
     }
 
     @Override
@@ -47,18 +50,25 @@ public boolean cancel(boolean mayInterruptIfRunning) {
 
     @Override
     public boolean isCancelled() {
-        return thread != null && !thread.isAlive();
+        return thread == null || thread.isAlive();
     }
 
     @Override
-    public boolean isDone() {
-        return thread != null && !thread.isAlive();
+    public synchronized boolean isDone() {
+        return value != null;
     }
 
     @Override
-    public Object get() throws InterruptedException, ExecutionException {
+    public Object get() {
+        synchronized (this) {
+            if (this.done) return value;
+        }
         synchronized (lock) {
-            lock.wait();
+            try {
+                lock.wait();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
         }
         synchronized (this) {
             return value;
@@ -67,6 +77,9 @@ public Object get() throws InterruptedException, ExecutionException {
 
     @Override
     public Object get(long timeout, @NotNull TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
+        synchronized (this) {
+            if (value != null) return value;
+        }
         synchronized (lock) {
             lock.wait(unit.toMillis(timeout));
         }

src/main/java/org/byteskript/skript/runtime/type/EventData.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2022 ByteSkript org (Moderocky)
+ * View the full licence information and permissions:
+ * https://github.com/Moderocky/ByteSkript/blob/master/LICENSE
+ */
+
+package org.byteskript.skript.runtime.type;
+
+import org.byteskript.skript.api.Event;
+import org.byteskript.skript.runtime.threading.ScriptFinishFuture;
+
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Future;
+
+public final class EventData<Type extends Event> {
+    private final boolean run;
+    private final Type event;
+    private final ScriptFinishFuture[] tasks;
+    private CompletableFuture<?> all, any;
+    private CompletableFuture<?>[] futures;
+
+    public EventData(boolean run, Type event, ScriptFinishFuture[] tasks) {
+        this.run = run;
+        this.event = event;
+        this.tasks = tasks;
+    }
+
+    private void prepareFutures() {
+        this.futures = new CompletableFuture[tasks.length];
+        for (int i = 0; i < tasks.length; i++) futures[i] = CompletableFuture.supplyAsync(tasks[i]);
+    }
+
+    public CompletableFuture<?> all() {
+        if (all != null) return all;
+        if (this.futures == null) this.prepareFutures();
+        return all = CompletableFuture.allOf(futures);
+    }
+
+    public CompletableFuture<?> any() {
+        if (any != null) return any;
+        if (this.futures == null) this.prepareFutures();
+        return any = CompletableFuture.anyOf(futures);
+    }
+
+    @SuppressWarnings("unchecked")
+    public Class<Type> getType() {
+        return (Class<Type>) event.getClass();
+    }
+
+    public boolean run() {
+        return run;
+    }
+
+    public Type event() {
+        return event;
+    }
+
+    public ScriptFinishFuture[] tasks() {
+        return tasks;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) return true;
+        if (obj == null || obj.getClass() != this.getClass()) return false;
+        var that = (EventData) obj;
+        return this.run == that.run &&
+            Objects.equals(this.event, that.event) &&
+            Objects.equals(this.tasks, that.tasks);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(run, event, tasks);
+    }
+
+    @Override
+    public String toString() {
+        return "EventData[" +
+            "run=" + run + ", " +
+            "event=" + event + ", " +
+            "tasks=" + tasks + ']';
+    }
+
+
+}

src/test/java/org/byteskript/skript/test/ThreadingTest.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2022 ByteSkript org (Moderocky)
+ * View the full licence information and permissions:
+ * https://github.com/Moderocky/ByteSkript/blob/master/LICENSE
+ */
+
+package org.byteskript.skript.test;
+
+import mx.kenzie.foundation.language.PostCompileClass;
+import org.byteskript.skript.api.Event;
+import org.byteskript.skript.api.ModifiableLibrary;
+import org.byteskript.skript.api.note.EventValue;
+import org.byteskript.skript.runtime.Skript;
+import org.byteskript.skript.runtime.config.ConfigEntry;
+import org.byteskript.skript.runtime.config.ConfigMap;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
+public class ThreadingTest extends SkriptTest {
+
+    private static final Skript skript
+        = new Skript();
+    //    = new Skript(new DebugSkriptCompiler(Stream.controller(System.out)));
+
+    private final String test = """
+        on test:
+            trigger:
+                print "Start"
+                wait 1 second
+                print "Finish"
+        
+        """;
+    private static PostCompileClass cls;
+
+    @BeforeClass
+    public static void setup() {
+        skript.registerLibrary(new ModifiableLibrary("test") {{ // Credit: kiip1 for suggestion.
+            generateSyntaxFrom(TestEvent.class);
+        }});
+        cls = skript.compileScript(
+            """
+                on test:
+                    trigger:
+                        wait 1 millisecond
+                        set event-thing to 6
+                """, "skript.events");
+        skript.loadScript(cls);
+    }
+
+    @Test
+    public void eventSynchronized() throws Throwable {
+        final TestEvent event;
+        skript.runEvent(event = new TestEvent())
+            .all()
+            .get();
+        assert event.number == 6;
+    }
+
+    @org.byteskript.skript.api.note.Event("on test")
+    public static final class TestEvent extends Event {
+        public int number = 1;
+        @EventValue("thing")
+        public void setThing(Number number) {
+            this.number = (int) number;
+        }
+    }
+}