diff -r a0d8b5ab79a2 -r 08ffdc3938e7 dew/src/main/java/org/apidesign/bck2brwsr/launcher/MethodInvocation.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dew/src/main/java/org/apidesign/bck2brwsr/launcher/MethodInvocation.java	Wed Jan 23 13:18:46 2013 +0100
@@ -0,0 +1,59 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.launcher;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public final class MethodInvocation {
+    final CountDownLatch wait = new CountDownLatch(1);
+    final String className;
+    final String methodName;
+    final String html;
+    private String result;
+    private Throwable exception;
+
+    MethodInvocation(String className, String methodName, String html) {
+        this.className = className;
+        this.methodName = methodName;
+        this.html = html;
+    }
+    
+    void await(long timeOut) throws InterruptedException {
+        wait.await(timeOut, TimeUnit.MILLISECONDS);
+    }
+    
+    void result(String r, Throwable e) {
+        this.result = r;
+        this.exception = e;
+        wait.countDown();
+    }
+
+    @Override
+    public String toString() {
+        if (exception != null) {
+            return exception.toString();
+        }
+        return result;
+    }
+    
+}