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Diffstat (limited to 'sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp')
8 files changed, 454 insertions, 0 deletions
diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/README b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/README new file mode 100644 index 0000000000..303c63146a --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/README @@ -0,0 +1,99 @@ +Tuscany - Learning More - Binding Comet - Chat Webapp +----------------------------------------------------------------- + +This sample demonstrates how Tuscany can expose services via Comet techniques +as well as how to interact with them using Tuscany's javascript toolkit. It +also demonstrates how to push multiple responses for a single request using +SCA callbacks via comet techniques. + +This project contains a service (ChatService) that handles chat operations like +register and postMessage. Once a client is registered it will receive messages +that are sent to the chat room. + +By adding <tuscany:binding.comet/> to a service definition, the Tuscany runtime +will handle the communication between the browser client and the service +implementation using Comet techniques. This enables bidirectional communication +over HTTP, therefore enabling server push. For more information, check +http://en.wikipedia.org/wiki/Comet_(programming). + +The comet binding is using the Atmosphere Framework under the hood to acomodate +as many deployment envorinments as possible. Basically, it checks if the +application server supports Servlet 3.0 falling back to a number of native +comet solutions provided by vendors (Jetty, Tomcat, WebLogic, GlassFish and +others). If none is available, Atmosphere will fallback to blocking IO. + +In order to enable callbacks to push multiple responses, you need to declare the +CometCallback in the service definition as follows: + <interface.java interface="org.apache.tuscany.sca.sample.comet.ChatService" + callbackInterface="org.apache.tuscany.sca.binding.comet.runtime.callback.CometCallback" /> + <tuscany:binding.comet /> + <callback> + <tuscany:binding.comet /> + </callback> + +The callback object has methods that facilitate sending messages back to the +calling client. It can be injected in the service implementation using the @Callback +annotation. However, the service implementation for this sample has the COMPOSITE +scope so the callback reference has to be obtained from the ComponentContext. + +One requirement that service methods have to meet to enable multiple response +support is that they have to be annotated with @OneWay to enable non-blocking +support. Without it, methods are treated synchronously sending a single response +which is the object returned by the method call. + +Invoking comet services can be done using Tuscany's javascript API which simulates +SCA in the browser. It uses the Atmosphere jQuery plugin under the hood. In order +to use it, the following script has to be included in the client page: + <script type="text/javascript" + src="tuscany-comet-js/org.apache.tuscany.sca.CometComponentContext.js"> + </script> + +The javascript toolkit permits choosing between two comet techniques: HTTP streaming +and long polling. More detailed information about them can be found on the previously +mentioned wikipedia page. + +First, a connect operation has to be issued in order to initiate communication +with the server side using the technique of your choice. This is done using the +connection method as follows: + SCA.TuscanyComet.connect('streaming'); // for HTTP streaming + SCA.TuscanyComet.connect('long-polling'); // for long polling + SCA.TuscanyComet.connect(); // starts with HTTP streaming and falls back to long polling if necessary + +The Tuscany Comet toolkit will inject proxies for all services defined in the composite +that are using binding.comet. All invocation and connection management is handled +under the hood so in order to invoke a comet service, the following should be called: + SCA.CometComponentContext.<service name>.<operation name>(<parameters>, callback); + +The callback parameter is the function that will handle responses received for a +certain service operation. It has a single argument which is the response: + function callback(response) { + // handle response + }; + +Note that the data exchange is automatically handled by the binding, so parameters +will be mapped to the data types defined in the method definition. Also, the response +will have the same data type as the server side object used to wrap the response. +Objects are passed over the wire in JSON format. + +Another detail worth mentioning is that the binding will use a single HTTP +connection to handle communication between a browser client and all services +defined using binding.comet in the same composite. Requests and responses will get +multiplexed via the same channel and get routed to the appropriate service +implementation, respectively javascript function. This is done in order to avoid +the 2 HTTP connection limit imposed by browsers. For more info, check +http://www.openajax.org/runtime/wiki/The_Two_HTTP_Connection_Limit_Issue. + +In order to run the sample, you can execute "mvn clean install t7:run" which will +start a Tomcat 7 instance automatically or use "mvn package" and deploy the resulting +war to the application server of your choice. + +Next, point your browser at + http://localhost:8080/sample-binding-comet-chat-webapp/ + +You can now chat using multiple tabs or browsers. You can see the persistent HTTP +streaming connection or long polling subsequent connections using the developer tools +provided by your browser. + +The comet binding is an experimental binding so community feedback is much +appreciated. Feel free to send comments or suggestions on the Apache Tuscany +dev mailing list (dev@tuscany.apache.org).
\ No newline at end of file diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/pom.xml b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/pom.xml new file mode 100644 index 0000000000..494df712a6 --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/pom.xml @@ -0,0 +1,81 @@ +<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+ <parent>
+ <groupId>org.apache.tuscany.sca.samples</groupId>
+ <artifactId>tuscany-samples-binding-comet</artifactId>
+ <version>2.0</version>
+ <relativePath>../pom.xml</relativePath>
+ </parent>
+
+ <artifactId>sample-binding-comet-chat-webapp</artifactId>
+ <packaging>war</packaging>
+ <version>2.0</version>
+ <name>Apache Tuscany SCA Sample binding.comet Chat Webapp</name>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.apache.tuscany.sca</groupId>
+ <artifactId>tuscany-binding-comet-runtime</artifactId>
+ <version>2.0</version>
+ </dependency>
+ <dependency>
+ <groupId>javax</groupId>
+ <artifactId>javaee-web-api</artifactId>
+ <version>6.0</version>
+ <scope>provided</scope>
+ </dependency>
+ <dependency>
+ <groupId>org.apache.tuscany.sca</groupId>
+ <artifactId>tuscany-base-runtime-pom</artifactId>
+ <version>2.0</version>
+ <type>pom</type>
+ <scope>compile</scope>
+ </dependency>
+ <dependency>
+ <groupId>com.google.guava</groupId>
+ <artifactId>guava</artifactId>
+ <version>r09</version>
+ <type>jar</type>
+ <scope>compile</scope>
+ </dependency>
+ </dependencies>
+
+ <build>
+ <plugins>
+ <plugin>
+ <groupId>com.googlecode.t7mp</groupId>
+ <artifactId>maven-t7-plugin</artifactId>
+ <version>0.9.6</version>
+ <configuration>
+ <webapps>
+ <webappArtifact>
+ <groupId>org.apache.tuscany.sca.samples</groupId>
+ <artifactId>sample-binding-comet-chat-webapp</artifactId>
+ <version>2.0</version>
+ </webappArtifact>
+ </webapps>
+ </configuration>
+ </plugin>
+ </plugins>
+ </build>
+</project>
+
diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/java/org/apache/tuscany/sca/sample/comet/ChatService.java b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/java/org/apache/tuscany/sca/sample/comet/ChatService.java new file mode 100644 index 0000000000..acb224715a --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/java/org/apache/tuscany/sca/sample/comet/ChatService.java @@ -0,0 +1,36 @@ +/* + * 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.sample.comet; + +import org.apache.tuscany.sca.binding.comet.runtime.callback.CometCallback; +import org.oasisopen.sca.annotation.Callback; +import org.oasisopen.sca.annotation.OneWay; +import org.oasisopen.sca.annotation.Remotable; + +@Callback(CometCallback.class) +@Remotable +public interface ChatService { + + @OneWay + void register(); + + @OneWay + void postMessage(String user, String message); + +} diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/java/org/apache/tuscany/sca/sample/comet/ChatServiceImpl.java b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/java/org/apache/tuscany/sca/sample/comet/ChatServiceImpl.java new file mode 100644 index 0000000000..c4f3241c5b --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/java/org/apache/tuscany/sca/sample/comet/ChatServiceImpl.java @@ -0,0 +1,56 @@ +/* + * 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.sample.comet; + +import java.util.ArrayList; +import java.util.concurrent.CopyOnWriteArrayList; + +import org.apache.tuscany.sca.binding.comet.runtime.callback.CometCallback; +import org.apache.tuscany.sca.binding.comet.runtime.callback.Status; +import org.oasisopen.sca.ComponentContext; +import org.oasisopen.sca.annotation.Context; +import org.oasisopen.sca.annotation.Scope; +import org.oasisopen.sca.annotation.Service; + +@Service(ChatService.class) +@Scope("COMPOSITE") +public class ChatServiceImpl implements ChatService { + + @Context + protected ComponentContext context; + + private CopyOnWriteArrayList<CometCallback> clients = new CopyOnWriteArrayList<CometCallback>(); + + @Override + public void postMessage(String user, String message) { + for (CometCallback callback : new ArrayList<CometCallback>(clients)) { + Status status = callback.sendMessage(user + ": " + message); + if (status == Status.CLIENT_DISCONNECTED) { + clients.remove(callback); + } + } + } + + @Override + public void register() { + // saving the callback object during register() method so it will push data back to the client + // using the callback method defined for the register operation in the js when used + clients.add(context.getRequestContext().<CometCallback> getCallback()); + } +} diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/META-INF/MANIFEST.MF b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/META-INF/MANIFEST.MF new file mode 100644 index 0000000000..58630c02ef --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/META-INF/MANIFEST.MF @@ -0,0 +1,2 @@ +Manifest-Version: 1.0
+
diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/WEB-INF/web.composite b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/WEB-INF/web.composite new file mode 100644 index 0000000000..c535a38116 --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/WEB-INF/web.composite @@ -0,0 +1,37 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!-- + * 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. +--> +<composite xmlns="http://docs.oasis-open.org/ns/opencsa/sca/200912" + xmlns:tuscany="http://tuscany.apache.org/xmlns/sca/1.1" + targetNamespace="http://samples" name="Chat"> + + <component name="ChatComponent"> + <implementation.java + class="org.apache.tuscany.sca.sample.comet.ChatServiceImpl" /> + <service name="ChatService"> + <interface.java interface="org.apache.tuscany.sca.sample.comet.ChatService" + callbackInterface="org.apache.tuscany.sca.binding.comet.runtime.callback.CometCallback" /> + <tuscany:binding.comet /> + <callback> + <tuscany:binding.comet /> + </callback> + </service> + </component> + +</composite>
\ No newline at end of file diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/WEB-INF/web.xml b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/WEB-INF/web.xml new file mode 100644 index 0000000000..25b06c457a --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/WEB-INF/web.xml @@ -0,0 +1,34 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!-- + * 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. +--> +<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:j2ee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_3.0.xsd" version="3.0"> + <display-name>Apache Tuscany Stock Comet Sample</display-name> + <filter> + <filter-name>tuscany</filter-name> + <filter-class>org.apache.tuscany.sca.host.webapp.TuscanyServletFilter</filter-class> + <async-supported>true</async-supported> + </filter> + <filter-mapping> + <filter-name>tuscany</filter-name> + <url-pattern>/*</url-pattern> + </filter-mapping> + <welcome-file-list> + <welcome-file>index.html</welcome-file> + </welcome-file-list> +</web-app>
\ No newline at end of file diff --git a/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/index.html b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/index.html new file mode 100644 index 0000000000..1aa79ed0b6 --- /dev/null +++ b/sca-java-2.x/branches/2.0/samples/learning-more/binding-comet/chat-webapp/src/main/webapp/index.html @@ -0,0 +1,109 @@ +<!-- + * 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. +--> +<html> + <head> + <title>Apache Tuscany Comet Sample</title> + <!-- Tuscany Comet Javascript Toolkit is dependent on jQuery --> + <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js" type="text/javascript"></script> + <script type="text/javascript" src="tuscany-comet-js/org.apache.tuscany.sca.CometComponentContext.js"></script> + <script type="text/javascript"> + var user = ""; + + $(document).ready(function() + { + $("#chat").hide(); + $("#username").focus(); + + // Tuscany Comet specific API + SCA.TuscanyComet.connect(); + + $("#register").click(function() { + register(messageCallback); + }); + + $("#username").keyup(function(e) { + if(e.keyCode == 13) { + register(messageCallback); + } + }); + + function register(callback) { + SCA.CometComponentContext.ChatService.register(callback); + user = $("#username").val(); + $("#login").hide(); + $("#chat").show(); + $("#message").focus(); + } + + $("#send").click(function() { + postMessage(user, $("#message").val(), postCallback); + }); + + $("#message").keyup(function(e) { + if(e.keyCode == 13) { + postMessage(user, $("#message").val(), postCallback); + } + }); + + function postMessage(user, message, callback) { + SCA.CometComponentContext.ChatService.postMessage(user, message, callback); + $("#message").val(""); + $("#message").focus(); + } + + }); + + // this method is invoked on new messages because the CometCallback object is saved + // during the register call so uses it's callback to push data back + function messageCallback(response) { + var textarea = document.getElementById('textarea'); + textarea.value += response + "\n"; + textarea.scrollTop = textarea.scrollHeight; + } + + function postCallback(response) { + } + + </script> + </head> + <body> + <h2>Apache Tuscany Comet Sample</h2> + <h3>Chat</h3> + <p/> + <div id="login"> + <table> + <tr> + <td>Nickname</td> + <td><input type="text" id='username'/></td> + <td><input type="button" id='register' value='Login'/></td> + </tr> + </table> + </div> + <div id="chat"> + <h3>Server notifications</h3> + <textarea id="textarea" rows="15" cols="30" readonly></textarea> + <table> + <tr> + <td><input type="text" id='message'/></td> + <td><input type="button" id='send' value='Send'/></td> + </tr> + </table> + </div> + </body> +</html> |