1 files changed, 93 insertions, 0 deletions
diff --git a/tags/java/sca/1.5.1/modules/binding-dwr/src/main/java/org/apache/tuscany/sca/binding/dwr/DWRInvoker.java b/tags/java/sca/1.5.1/modules/binding-dwr/src/main/java/org/apache/tuscany/sca/binding/dwr/DWRInvoker.java
new file mode 100644
index 0000000000..24e6dbbcd4
--- /dev/null
+++ b/tags/java/sca/1.5.1/modules/binding-dwr/src/main/java/org/apache/tuscany/sca/binding/dwr/DWRInvoker.java
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.binding.dwr;
+
+import java.util.Collection;
+
+import org.apache.tuscany.sca.core.invocation.MessageImpl;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+import org.directwebremoting.ScriptBuffer;
+import org.directwebremoting.WebContext;
+import org.directwebremoting.WebContextFactory;
+import org.directwebremoting.proxy.dwr.Util;
+
+/**
+ * The invoker for a DWR Binding.
+ *
+ * @version $Rev$ $Date$
+ */
+public class DWRInvoker implements Invoker {
+
+    private String referenceFunction;
+    
+    public DWRInvoker(String referenceName, Operation operation) {
+        this.referenceFunction = referenceName + "." + operation.getName();
+    }
+
+    public Message invoke(Message requestMsg) {
+
+        invoke((Object[])requestMsg.getBody());
+
+        // DWR references can not return anything 
+        return new MessageImpl();
+    }
+
+    public void invoke(Object[] args) {
+
+        // TODO: this only works if its the same thread as request
+        WebContext wctx = WebContextFactory.get();
+        String currentPage = wctx.getCurrentPage();
+
+        // Get a DWR Util proxy for all the browsers on the current page:
+        Collection sessions = wctx.getScriptSessionsByPage(currentPage);
+        Util utilAll = new Util(sessions);
+
+        ScriptBuffer referenceInvoke = getInvokeFragment(args, wctx);
+
+        // add the reference call to the Util proxy which will cause DWR to 
+        // asynchronously send it to be run on each active browser client
+        utilAll.addScript(referenceInvoke);
+    }
+
+    /**
+     * Creates a fragment of JavaScript code to invoke the reference function
+     * Eg: "<referenceName>.<operationName>(arg1, arg2,...);"
+     */
+    protected ScriptBuffer getInvokeFragment(Object[] args, WebContext wctx) {
+
+        ScriptBuffer sb = new ScriptBuffer();
+        sb.appendScript(referenceFunction);
+        sb.appendScript("(");
+        if (args != null) {
+            for (int i = 0; i < args.length; i++) {
+                sb.appendData(args[i]);
+                if (i < (args.length - 1)) {
+                    sb.appendScript(", ");
+                }
+            }
+        }
+        sb.appendScript(");");
+
+        return sb;
+    }
+
+}