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/*
* 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);
}
}
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