Support asynchronous events; Addresses BUKKIT-1212

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/test/java/org/bukkit/plugin/PluginManagerTest.java

@@ -0,0 +1,118 @@
+package org.bukkit.plugin;
+
+import static junit.framework.Assert.*;
+
+import org.bukkit.Server;
+import org.bukkit.TestServer;
+import org.bukkit.command.SimpleCommandMap;
+import org.bukkit.event.Event;
+import org.bukkit.event.TestEvent;
+import org.junit.Test;
+
+public class PluginManagerTest {
+    private class MutableObject {
+        volatile Object value = null;
+    }
+
+    final Server server = TestServer.getInstance();
+    final SimpleCommandMap commandMap = new SimpleCommandMap(server);
+    final PluginManager pm = new SimplePluginManager(server, commandMap);
+    final MutableObject store = new MutableObject();
+
+    @Test
+    public void testAsyncSameThread() {
+        final Event event = new TestEvent(true);
+        try {
+            pm.callEvent(event);
+        } catch (IllegalStateException ex) {
+            assertEquals(event.getEventName() + " cannot be triggered asynchronously from primary server thread.", ex.getMessage());
+            return;
+        }
+        throw new IllegalStateException("No exception thrown");
+    }
+
+    @Test
+    public void testSyncSameThread() {
+        final Event event = new TestEvent(false);
+        pm.callEvent(event);
+    }
+
+    @Test
+    public void testAsyncLocked() throws InterruptedException {
+        final Event event = new TestEvent(true);
+        Thread secondThread = new Thread(
+            new Runnable() {
+                public void run() {
+                    try {
+                        synchronized (pm) {
+                            pm.callEvent(event);
+                        }
+                    } catch (Throwable ex) {
+                        store.value = ex;
+                    }
+                }});
+        secondThread.start();
+        secondThread.join();
+        assertTrue(store.value instanceof IllegalStateException);
+        assertEquals(event.getEventName() + " cannot be triggered asynchronously from inside synchronized code.", ((Throwable) store.value).getMessage());
+    }
+
+    @Test
+    public void testAsyncUnlocked() throws InterruptedException {
+        final Event event = new TestEvent(true);
+        Thread secondThread = new Thread(
+            new Runnable() {
+                public void run() {
+                    try {
+                        pm.callEvent(event);
+                    } catch (Throwable ex) {
+                        store.value = ex;
+                    }
+                }});
+        secondThread.start();
+        secondThread.join();
+        if (store.value != null) {
+            throw new RuntimeException((Throwable) store.value);
+        }
+    }
+
+    @Test
+    public void testSyncUnlocked() throws InterruptedException {
+        final Event event = new TestEvent(false);
+        Thread secondThread = new Thread(
+            new Runnable() {
+                public void run() {
+                    try {
+                        pm.callEvent(event);
+                    } catch (Throwable ex) {
+                        store.value = ex;
+                    }
+                }});
+        secondThread.start();
+        secondThread.join();
+        if (store.value != null) {
+            throw new RuntimeException((Throwable) store.value);
+        }
+    }
+
+    @Test
+    public void testSyncLocked() throws InterruptedException {
+        final Event event = new TestEvent(false);
+        Thread secondThread = new Thread(
+            new Runnable() {
+                public void run() {
+                    try {
+                        synchronized (pm) {
+                            pm.callEvent(event);
+                        }
+                    } catch (Throwable ex) {
+                        store.value = ex;
+                    }
+                }});
+        secondThread.start();
+        secondThread.join();
+        if (store.value != null) {
+            throw new RuntimeException((Throwable) store.value);
+        }
+    }
+}