Modified event helper mechanism to allow helpers to abort the event

dispatch. Added code to abort object added events that are trying to add a
non-existent object to an oid list. Wrote test driver for this and
duplicate object add request handling.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@196 542714f4-19e9-0310-aa3c-eee0fc999fb1

tests/src/java/com/threerings/presents/server/DestroyedRefTest.java

@@ -0,0 +1,77 @@
+//
+// $Id: DestroyedRefTest.java,v 1.1 2001/08/08 21:56:48 mdb Exp $
+
+package com.threerings.cocktail.cher.server.test;
+
+import com.threerings.cocktail.cher.Log;
+import com.threerings.cocktail.cher.dobj.*;
+import com.threerings.cocktail.cher.server.CherServer;
+
+/**
+ * Tests that the dobjmgr will not allow a destroyed object to be added to
+ * an oid list.
+ */
+public class DestroyedRefTest
+    implements Runnable, Subscriber
+{
+    public void run ()
+    {
+        // create two test objects
+        CherServer.omgr.createObject(TestObject.class, this, true);
+        CherServer.omgr.createObject(TestObject.class, this, true);
+    }
+
+    public void objectAvailable (DObject object)
+    {
+        // keep references to our test objects
+        if (_objone == null) {
+            _objone = (TestObject)object;
+
+        } else {
+            _objtwo = (TestObject)object;
+
+            // add object one to object two twice in a row to make sure
+            // repeated adds don't result in the object being listed twice
+            _objtwo.addToList(_objone.getOid());
+            _objtwo.addToList(_objone.getOid());
+
+            // now that we have both objects, try to set up the reference.
+            // first we queue up a destroy event for object two, then we
+            // try to reference it on object one's oid list
+            _objtwo.destroy();
+            _objone.addToList(_objtwo.getOid());
+
+            // finally dispatch an event on which we can trigger our exit
+            _objone.setFoo(1);
+        }
+    }
+
+    public void requestFailed (int oid, ObjectAccessException cause)
+    {
+        Log.warning("Ack. Unable to create object [cause=" + cause + "].");
+    }
+
+    public boolean handleEvent (DEvent event, DObject target)
+    {
+        // when we get the attribute change, we can exit
+        if (event instanceof ObjectDestroyedEvent) {
+            Log.info("The upcoming object added event should be rejected.");
+
+        } else if (event instanceof ObjectAddedEvent &&
+                   target == _objtwo) {
+            Log.info("list should contain only one oid: " + _objtwo.list);
+
+        } else if (event instanceof AttributeChangedEvent) {
+            // go bye bye
+            CherServer.shutdown();
+
+        } else {
+            Log.info("Got unexpected event: " + event);
+        }
+
+        return true;
+    }
+
+    protected TestObject _objone;
+    protected TestObject _objtwo;
+}