diff -r 5866e89ef568 -r d382dacfd73f rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/InvocationContext.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/InvocationContext.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,110 @@
+/**
+ * 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.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/** Represents individual method invocation, its context and its result.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public final class InvocationContext {
+    final CountDownLatch wait = new CountDownLatch(1);
+    final Class<?> clazz;
+    final String methodName;
+    private final Launcher launcher;
+    private String result;
+    private Throwable exception;
+    String html;
+    final List<Resource> resources = new ArrayList<>();
+
+    InvocationContext(Launcher launcher, Class<?> clazz, String methodName) {
+        this.launcher = launcher;
+        this.clazz = clazz;
+        this.methodName = methodName;
+    }
+    
+    /** An HTML fragment to be available for the execution. Useful primarily when
+     * executing in a browser via {@link Launcher#createBrowser(java.lang.String)}.
+     * @param html the html fragment
+     */
+    public void setHtmlFragment(String html) {
+        this.html = html;
+    }
+    
+    /** HTTP resource to be available during execution. An invocation may
+     * perform an HTTP query and obtain a resource relative to the page.
+     */
+    public void addHttpResource(String relativePath, String mimeType, InputStream content) {
+        if (relativePath == null || mimeType == null || content == null) {
+            throw new NullPointerException();
+        }
+        resources.add(new Resource(content, mimeType, relativePath));
+    }
+    
+    /** Invokes the associated method. 
+     * @return the textual result of the invocation
+     */
+    public String invoke() throws IOException {
+        launcher.runMethod(this);
+        return toString();
+    }
+    
+    /** Obtains textual result of the invocation.
+     * @return text representing the exception or result value
+     */
+    @Override
+    public String toString() {
+        if (exception != null) {
+            return exception.toString();
+        }
+        return result;
+    }
+    
+    /**
+     * @param timeOut
+     * @throws InterruptedException 
+     */
+    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();
+    }
+
+
+    static final class Resource {
+        final InputStream httpContent;
+        final String httpType;
+        final String httpPath;
+
+        Resource(InputStream httpContent, String httpType, String httpPath) {
+            this.httpContent = httpContent;
+            this.httpType = httpType;
+            this.httpPath = httpPath;
+        }
+    }
+}