| /* |
| * 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; |
| } |
| |
| } |