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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.comet.runtime;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
+import org.atmosphere.cpr.AtmosphereServlet;
+
+/**
+ * This class is used to create two servlets: one exposing all the comet
+ * services, the other one exposing the javascript toolkit. Exposing all comet
+ * services through a single servlet is needed as the browsers are undergone by
+ * the two http connection limit so all comet services should send their
+ * responses via the same http connection to the same client. Dispatching to the
+ * corresponding endpoint and operation is done internally using Jersey RESTful
+ * Web Services integration with the AtmosphereServlet. The Javascript toolkit
+ * servlet is unique as it is not tied to any of the services - it offers a
+ * global API.
+ */
+public final class ServletFactory {
+
+ /**
+ * Init-param key for the AtmosphereServlet defining where to look for
+ * Jersey classes.
+ */
+ private static final String PACKAGE_KEY = "com.sun.jersey.config.property.packages";
+
+ /**
+ * Package of the class handling dispatching to endpoints.
+ */
+ private static final String PACKAGE_VALUE = "org.apache.tuscany.sca.binding.comet.runtime.handler";
+
+ /**
+ * Package of the class handling Javascript toolkit retrieval.
+ */
+ private static final String JS_PACKAGE_VALUE = "org.apache.tuscany.sca.binding.comet.runtime.javascript";
+
+ /**
+ * Property in the ServletContext where endpoints are added incrementally as
+ * the Tuscany runtime calls the CometServiceBindingProvider for each comet
+ * service.
+ */
+ public static final String ENDPOINTS_KEY = "org.apache.tuscany.sca.binding.comet.endpoints";
+
+ /**
+ * Property in the ServletContext where operations are added incrementally
+ * as the CometServiceBindingProvider is calling the registerServlet method
+ * for each comet service method.
+ */
+ public static final String OPERATIONS_KEY = "org.apache.tuscany.sca.binding.comet.operations";
+
+ /**
+ * Path where services will be exposed.
+ */
+ public static final String PATH = "/tuscany-comet/*";
+
+ /**
+ * Path where Javascript toolkit will be exposed.
+ */
+ public static final String JS_PATH = "/org.apache.tuscany.sca.cometComponentContext.js/*";
+
+ /**
+ * The servlet that is exposing the comet services.
+ */
+ private static AtmosphereServlet cometServlet = null;
+
+ /**
+ * The servlet that is exposing the Javascript toolkit.
+ */
+ private static AtmosphereServlet javascriptServlet = null;
+
+ /**
+ * Private constructor for the singleton class.
+ */
+ private ServletFactory() {
+ }
+
+ /**
+ * Method called by CometServiceBindingProvider for each endpoint in order
+ * to create the two singleton servlets.
+ *
+ * @param servletHost the underlying servlet host
+ */
+ public static synchronized void registerServlet(final ServletHost servletHost) {
+ if (ServletFactory.cometServlet == null) {
+ ServletFactory.cometServlet = new AtmosphereServlet();
+ ServletFactory.cometServlet.addInitParameter(ServletFactory.PACKAGE_KEY, ServletFactory.PACKAGE_VALUE);
+ servletHost.addServletMapping(ServletFactory.PATH, ServletFactory.cometServlet);
+ // store operations and corresponding endpoint in the ServletContext
+ // so that they can be retrieved from inside the web service methods
+ final Map<String, RuntimeEndpoint> endpoints = new HashMap<String, RuntimeEndpoint>();
+ ServletFactory.cometServlet.getServletContext().setAttribute(ServletFactory.ENDPOINTS_KEY, endpoints);
+ final Map<String, Operation> operations = new HashMap<String, Operation>();
+ ServletFactory.cometServlet.getServletContext().setAttribute(ServletFactory.OPERATIONS_KEY, operations);
+ }
+ if (ServletFactory.javascriptServlet == null) {
+ ServletFactory.javascriptServlet = new AtmosphereServlet();
+ ServletFactory.javascriptServlet.addInitParameter(ServletFactory.PACKAGE_KEY,
+ ServletFactory.JS_PACKAGE_VALUE);
+ servletHost.addServletMapping(ServletFactory.JS_PATH, ServletFactory.javascriptServlet);
+ }
+ }
+
+ /**
+ * Method called by CometServiceBindingProvider for each endpoint operation
+ * in order to store all the operations the servlet will serve.
+ *
+ * @param endpoint the endpoint
+ * @param operation the operation
+ */
+ public static synchronized void addOperation(final RuntimeEndpoint endpoint, final Operation operation) {
+ final String url = "/" + endpoint.getService().getName() + "/" + operation.getName();
+ final Map<String, RuntimeEndpoint> endpoints =
+ (Map<String, RuntimeEndpoint>)ServletFactory.cometServlet.getServletContext()
+ .getAttribute(ServletFactory.ENDPOINTS_KEY);
+ endpoints.put(url, endpoint);
+ final Map<String, Operation> operations =
+ (Map<String, Operation>)ServletFactory.cometServlet.getServletContext()
+ .getAttribute(ServletFactory.OPERATIONS_KEY);
+ operations.put(url, operation);
+ }
+
+ /**
+ * Method called by CometServiceBindingProvider for each endpoint operation
+ * in order to remove the two servlets.
+ *
+ * @param servletHost the underlying servlet host
+ */
+ public static synchronized void unregisterServlet(final ServletHost servletHost) {
+ servletHost.removeServletMapping(ServletFactory.PATH);
+ servletHost.removeServletMapping(ServletFactory.JS_PATH);
+ }
+
+}