diff options
Diffstat (limited to 'sca-java-1.x/tags/1.6/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java')
-rw-r--r-- | sca-java-1.x/tags/1.6/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java b/sca-java-1.x/tags/1.6/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java new file mode 100644 index 0000000000..bf33f7ad9e --- /dev/null +++ b/sca-java-1.x/tags/1.6/modules/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java @@ -0,0 +1,156 @@ +/* + * 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.implementation.web; + +import java.io.IOException; +import java.io.PrintWriter; +import java.io.UnsupportedEncodingException; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import javax.servlet.ServletConfig; +import javax.servlet.ServletContext; +import javax.servlet.ServletException; +import javax.servlet.http.HttpServlet; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; + +import org.apache.tuscany.sca.assembly.ComponentReference; +import org.apache.tuscany.sca.runtime.RuntimeComponent; + +/** + * Servlet that handles the GET request for the componentContext.js script + * + * The script is generated by calling ScriptProcessors to output the code + * for the SCA references, properties etc. + */ +public class ComponentContextServlet extends HttpServlet { + private static final long serialVersionUID = 1L; + + protected static final String HEADER = "/** --- Apache Tuscany componentContext.js --- */\n"; + protected static final String FOOTER = "/** --- Apache Tuscany componentContext.js EOF --- */\n"; + + public static final String COMPONENT_CONTEXT_SCRIPT_URI = "org.apache.tuscany.sca.componentContext.js"; + + protected transient Map<String, Object> attributes = new HashMap<String, Object>(); + protected transient ServletContext servletContext; + private transient List<ContextScriptProcessor> contextScriptProcessors = new ArrayList<ContextScriptProcessor>(); + + public ComponentContextServlet() { + contextScriptProcessors.add(new JSONRPCScripProcessor()); + } + + @Override + public void init(ServletConfig servletConfig) throws ServletException { + this.servletContext = servletConfig.getServletContext(); + if (attributes.size() > 0) { + for (String name : attributes.keySet()) { + servletContext.setAttribute(name, attributes.get(name)); + } + } + } + + @Override + public void doGet(HttpServletRequest req, HttpServletResponse response) throws IOException { + response.setContentType("text/plain;charset=utf-8"); + PrintWriter out = response.getWriter(); + + out.write(HEADER); + + doScriptInit(req, response); + + doScriptReferences(req, response); + + out.write(FOOTER); + + out.flush(); + out.close(); + } + + /** + * Calls each ContextScriptProcessor once to insert any required initilization code into componentContext.js + */ + protected void doScriptInit(HttpServletRequest req, HttpServletResponse response) throws IOException, UnsupportedEncodingException { + + PrintWriter out = response.getWriter(); + + out.println("if (SCA == undefined) var SCA = new Object();"); + out.println("if (SCA.componentContext == undefined) {"); + out.println(" SCA.componentContext = new Object();"); + out.println(" SCA.componentContext.serviceNames = [];"); + out.println(" SCA.componentContext.serviceProxys = [];"); + out.println(" SCA.componentContext.getService = function(serviceName){"); + out.println(" var i = SCA.componentContext.serviceNames.indexOf(serviceName);"); + out.println(" return SCA.componentContext.serviceProxys[i];"); + out.println(" };"); + out.println(" if (componentContext == undefined) var componentContext = SCA.componentContext;"); + out.println("}"); + + for (ContextScriptProcessor csp : contextScriptProcessors) { + csp.scriptInit(req, response); + } + } + + /** + * Calls each ContextScriptProcessor for each SCA reference to insert code for the reference into componentContext.js + */ + protected void doScriptReferences(HttpServletRequest req, HttpServletResponse response) throws IOException, UnsupportedEncodingException { + + PrintWriter out = response.getWriter(); + + out.write("// SCA References\n"); + + RuntimeComponent component = (RuntimeComponent)servletContext.getAttribute("org.apache.tuscany.sca.implementation.web.RuntimeComponent"); + + for (ComponentReference cr : component.getReferences()) { + String ref = "// SCA Reference " + cr.getName() + "\n"; + out.write(ref); + for (ContextScriptProcessor csp : contextScriptProcessors) { + csp.scriptReference(cr, req, response); + } + } + + out.write("\n// SCA References end.\n"); + } + + /** + * Calls each ContextScriptProcessor for each SCA property to insert code for the property into componentContext.js + */ + protected void doScriptProperties(HttpServletRequest req, HttpServletResponse response) throws IOException, UnsupportedEncodingException { + // TODO: support properties + } + + /** + * Set an attribute on the ServletContext + */ + public void setAttribute(String name, Object value) { + if (servletContext != null) { + servletContext.setAttribute(name, value); + } else { + attributes.put(name, value); + } + } + + public void addContextScriptProcessor(ContextScriptProcessor csp) { + contextScriptProcessors.add(csp); + } +} |