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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.binding.jsonrpc.provider;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet to handle requests for the scaDomain.js script.
*
* This script wrappers the JSON-RPC-Java jsonrpc.js script
* adding in at the bottom the JavaScript to create and initialize
* the variables representing the SCA services.
*
* @version $Rev$ $Date$
*/
public class ScaDomainScriptServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected transient List<String> serviceNames;
public ScaDomainScriptServlet() {
serviceNames = new ArrayList<String>();
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
ServletOutputStream os = response.getOutputStream();
os.println();
os.println("/* Apache Tuscany scaDomain.js Header */");
os.println();
writeJSONRPCJavaScript(os);
writeScaDomainCode(os, request.getServletPath());
}
/**
* Creates a JavaScript variable within the scaDomain script for each SCA service and
* initializes its value with the JSON-RPC client to invoke the serverside service.
*/
protected void writeScaDomainCode(ServletOutputStream out, String path) throws IOException {
out.println();
out.println("/* Apache Tuscany scaDomain.js Footer */");
out.println();
out.println("function scaDomain() {}");
// remove the leading slash '/' character
path = path.substring(1);
for (String serviceName : serviceNames) {
out.println();
// A slight hack to make the service function available with a variable named 'serviceName'
// to do that the JSONRpcClient is added to the scaDomain and then the service function is got from that
out.println("scaDomain." + serviceName + " = " + "new JSONRpcClient(\"" + serviceName + "\");");
out.println(serviceName + " = scaDomain." + serviceName + ".Service;");
}
out.println();
out.println("/** End of Apache Tuscany scaDomain.js */");
out.println();
}
/**
* Reads the jsonrpc.js script from the classpath and adds its contents to the output stream.
*/
protected void writeJSONRPCJavaScript(ServletOutputStream os) throws IOException {
URL url = getClass().getResource("jsonrpc.js");
InputStream is = url.openStream();
int i;
while ((i = is.read()) != -1) {
os.write(i);
}
}
public void addService(String serviceName) {
serviceNames.add(serviceName);
}
public void removeService(String serviceName) {
serviceNames.remove(serviceName);
}
public List<String> getServiceNames() {
return serviceNames;
}
}
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