Recording the stream on the server takes one simple line as displayed here:

StreamManager.java

ClientBroadcastStream stream = (ClientBroadcastStream) app.getBroadcastStream(conn.getScope(), "hostStream");
try {
	// Save the stream to disk.
	stream.saveAs(streamName, false);
} catch (Exception e) {
	logger.error("Error while saving stream: {}", streamName);
}

The only button in the broadcast application starts and stops the recording session. The click handler does all the work:

Broadcast.as

private function onClick(event:MouseEvent):void {
	var button:Button = event.target as Button;
	// Record the stream by triggering a server event.
	if (button.label == "Record") {
		// Tell the remote server to start recording.
		runtime.conn.call("streamManager.recordShow", null);
		// Re-label the button.
		button.label = "Stop";
	// Stop recording the stream.
	} else if (button.label == "Stop") {
		// Tell the remote server to stop recording.
		runtime.conn.call("streamManager.stopRecordingShow", null);
		// Re-label the button.
		button.label = "Record";
	}
}

Like I said, not much to it. But there’s a lot of power wrapped up in this little piece of functionality.

Grab the source code for this tutorial here. The example code was updated to be compatible with Red5 0.9.1 on July 29, 2010.

*Note: If you are not familiar with my first post on this topic, please give it a read before continuing here.

Getting started, the only item left untouched by the refactoring is the User object. Given that I originally defined the class using the Hibernate annotations there is nothing to change other than to use the annotation based SessionFactory by default. I should note that the Hibernate mapping (HBM) file for the User object no longer exists in the source tree.

User.java

@Entity
@Table(name = "users")
public class User {

    @Id
    @GeneratedValue
    @Column(name = "id", nullable = false)
    private Long id;

    @Column(name = "user_name", nullable = false, length = 32, unique = true)
    private String userName;

    @Column(name = "password", nullable = false)
    private String password;

    @Column(name = "first_name", length = 64)
    private String firstName;

    @Column(name = "last_name", length = 64)
    private String lastName;

    @Column(name = "email", nullable = false)
    private String email;

    ...
}

HibernateApplicationDAO has been given a new name and is now HibernateApplicationRepository. This is one of the biggest changes here and removes the dependency on Spring’s HibernateTemplate. HibernateTemplate was originally created to work around the limitations of Hibernate 2′s usage of checked exceptions. Because Hibernate now uses unchecked runtime exceptions, it is no longer necessary. Injection of the SessionFactory into the repository object gives us direct access to the current HibernateSession. The @Repository annotation has been added to support transactions and persistence exception translation.

HibernateApplicationRepository.java

@Repository
public class HibernateApplicationRepository implements ApplicationRepository {

    private static final Logger logger = Red5LoggerFactory.getLogger(HibernateApplicationRepository.class, "hibernate");

    private SessionFactory sessionFactory;

    public User getUser(String user, String pass) {
        logger.debug("Retrieving user from the database.");
        // Ask Hibernate to query for the user based upon the specified user/pass.
        Criteria crit = sessionFactory.getCurrentSession().createCriteria(User.class);
        crit.add(Restrictions.eq("userName", user));
        crit.add(Restrictions.eq("password", pass));
        User u = (User) crit.uniqueResult();
        // Insure that we got something back from Hibernate.
        if (null == u) {
            logger.warn("User does not exist for credentials: {}/{}", user, pass);
            throw new ObjectRetrievalFailureException(User.class, user);
        }
        // Return the results.
        return u;
    }

    @Required
    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
}

ApplicationServiceImpl is now annotated with the @Service and @Transactional annotations. With these annotations, we no longer need to proxy ApplicationServiceImpl and can eliminate several lines of XML in the configuration file while maintaining full transaction support.

ApplicationServiceImpl.java

@Service
@Transactional
public class ApplicationServiceImpl implements ApplicationService {

    private static final Logger logger = Red5LoggerFactory.getLogger(ApplicationServiceImpl.class, "hibernate");

    private ApplicationRepository repository;

    @Transactional(readOnly = true)
    public User getUser(String user, String pass) throws ServiceException {
        logger.debug("Looking up user for user/pass of: {}/{}", user, pass);
        try {
            // Return the result of the data access call.
            return repository.getUser(user, pass);
        }
        catch (Exception e) {
            logger.error("Could not load user with credentials: {}/{}", user, pass);
            throw new ServiceException("Could not load user!", e);
		}
	}

    @Required
    public void setApplicationRepository(ApplicationRepository repository) {
        this.repository = repository;
    }
}

As you can see from the following bean declaration, we’ve cut down on the XML configuration significantly by taking advantage of these annotations.

red5-web.xml

    <tx:annotation-driven/>

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>

    <bean id="applicationRepository" class="net.sziebert.tutorials.dao.hibernate.HibernateApplicationRepository">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>

    <bean id="applicationService" class="net.sziebert.tutorials.service.impl.ApplicationServiceImpl">
        <property name="applicationRepository" ref="applicationRepository"/>
    </bean>

For the sake of direct comparison, here is the original bean declaration:

red5-web.xml

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean id="txProxyTemplate" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="transactionManager">
            <ref local="transactionManager" />
        </property>
        <property name="transactionAttributes">
            <props>
                <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
                <prop key="save*">PROPAGATION_REQUIRED</prop>
                <prop key="update*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>

    <bean id="applicationDAO" class="net.sziebert.red5.adapter.dao.hibernate.HibernateApplicationDAO">
        <property name="hibernateTemplate" ref="hibernateTemplate" />
    </bean>

    <bean id="applicationService" parent="txProxyTemplate">
        <property name="target">
            <bean class="net.sziebert.red5.adapter.service.impl.ApplicationServiceImpl">
                <property name="applicationDAO" ref="applicationDAO" />
            </bean>
        </property>
    </bean>

All classes now use the improved Red5 logging support which is backed by SLF4J and Logback by default. Here is an example from the ApplicationAdapter subclass:

Application.java

public class Application extends ApplicationAdapter {

    private static final Logger logger = Red5LoggerFactory.getLogger(Application.class, "hibernate");

    private ApplicationService service;

    /* ----- ApplicationAdapter delegate methods ----- */

    @Override
    public boolean roomConnect(IConnection conn, Object[] params) {
        logger.debug("New connection attempt from {}...", conn.getRemoteAddress());
        // Parse the user/pass out of the connection parameters
        String userName = (String) params[0];
        String password = (String) params[1];
        // Get the User object for this connection
        User user = null;
        // Insure that we have received the proper set of parameters.
        if (isNotBlank(userName) &&
                isNotBlank(password)) {
            user = authenticate(userName, password);
        }
        // If we got a valid user object, then allow the connection. Otherwise,
        // the user could not be found or something bad happened. In either
        // case, we do not want to allow the connection.
        return user != null && super.roomConnect(conn, params);
    }

    ...
}

The flash client code has been rewritten entirely in ActionScript 3 and was reduced down to a single class for the entire application. For those of you following along with the source, you’ll note that there are actually 2 classes. The second one is a simple dynamic class used to store runtime related resources and could be easily removed from the implementation. It was a design decision on my part to keep it. ActionScript 3 is much more object-oriented than it’s predecessor and leverages the new keyword for constructing components.

Hibernate.as

package net.sziebert.tutorials {

	import com.adobe.crypto.MD5;

	import fl.controls.Button;
	import fl.controls.Label;
	import fl.controls.TextArea;
	import fl.controls.TextInput;
	import fl.managers.StyleManager;
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.events.NetStatusEvent;
	import flash.events.SecurityErrorEvent;
	import flash.net.NetConnection;
	import flash.net.ObjectEncoding;
	import flash.net.registerClassAlias;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFormat;

	import net.sziebert.tutorials.Runtime;

	public class Hibernate extends Sprite {

		private var connect:Button;
		private var pass:TextInput;
		private var passLbl:Label;
		private var runtime:Runtime;
		private var textArea:TextArea;
		private var user:TextInput;
		private var userLbl:Label;

		public function Hibernate():void {
			trace("Starting Hibernate application...");
			runtime = Runtime.getInstance();
			stage.align = StageAlign.TOP_LEFT;
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.addEventListener(Event.RESIZE, onResize);
			createChildren();
		}

		/* ----- Utility functions ----- */

		private function createChildren():void {
			// Create the username label.
			userLbl = new Label();
			userLbl.text = "Username:";
			userLbl.autoSize = TextFieldAutoSize.LEFT;
			addChild(userLbl);
			// Create the username input field.
			user = new TextInput();
			user.maxChars = 255;
			user.restrict = "A-Za-z 0-9:;()|.,?!$&*{}[]+=_-'"";
			addChild(user);
			// Create the password label,
			passLbl = new Label();
			passLbl.text = "Password:";
			passLbl.autoSize = TextFieldAutoSize.LEFT;
			addChild(passLbl);
			// Create the password input field.
			pass = new TextInput();
			pass.maxChars = 255;
			pass.displayAsPassword = true;
			addChild(pass);
			// Create the connect button.
			connect = new Button();
			connect.label = "Connect";
			connect.addEventListener(MouseEvent.CLICK, onClick);
			addChild(connect);
			// Create the text area to display the log information.
			textArea = new TextArea();
			textArea.editable = false;
			textArea.wordWrap = true;
			addChild(textArea);
			// Remove the avatar.
			removeChildAt(0);
			// Size the elements.
			setSize(stage.stageWidth, stage.stageHeight);
		}

		private function setSize(w:Number, h:Number):void {
			// Move and size the username components
			userLbl.move(18, 18);
			//userLabel.setSize(50, 22);
			user.move(96, 18);
			user.setSize((w - 226), 22);
			// Move and size the password components
			passLbl.move(18, 50);
			//passLabel.setSize(50, 22);
			pass.move(96, 50);
			pass.setSize((w - 226), 22);
			// Move and size the connect button
			connect.move(w - 118, 18);
			connect.setSize(100, 54);
			// Move and size the textarea
			textArea.move(18, 82);
			textArea.setSize((w - 36), (h - 100));
		}

		private function initConnection(username:String, password:String):void {
			if (username == "" || password == "") {
				throw new Error("You must enter a valid username and/or password.");
			}
			// Create the new connection object.
			runtime.conn = new NetConnection();
			runtime.conn.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
			runtime.conn.addEventListener(SecurityErrorEvent.SECURITY_ERROR, onSecurityError);
			log("Connecting to Red5...");
			runtime.conn.connect("rtmp://localhost/hibernate/test", username, MD5.hash(password));
		}

		private function log(msg:String):void {
			// Update the chat window with the message
			textArea.text += (msg + "n");
			textArea.verticalScrollPosition = textArea.maxVerticalScrollPosition;
		}

		/* ----- Event handlers ----- */

		private function onResize(event:Event):void {
			setSize(stage.stageWidth, stage.stageHeight);
		}

		private function onClick(event:MouseEvent):void {
			var button:Button = event.target as Button;
			// We are currently connected, so disconnect.
			if (runtime.conn && runtime.conn.connected) {
				runtime.conn.close();
				return;
			}
			try {
				// Initialize the connection
				initConnection(user.text, pass.text);
			} catch (err:Error) {
				// Otherwise we need to show an alert indicating the need for proper user input.
				log("Error: You must enter a valid username and/or password.");
			}
		}

		private function onNetStatus(event:NetStatusEvent):void {
			trace("onNetStatus: " + event.info.code);
			switch (event.info.code) {
			        case "NetConnection.Connect.Success":
					log("Connection attempt successful.");
					connect.label = "Disconnect";
                                        break;
				case "NetConnection.Connect.Rejected":
					log("Connection attempt rejected.");
					break;
				case "NetConnection.Connect.Closed":
					log("Connection closed.");
					connect.label = "Connect";
					break;
				case "NetConnection.Connect.Failed":
					log("Connection failure.");
					break;
		        }
		}

		private function onSecurityError(event:SecurityErrorEvent):void {
        		trace("onSecurityError: " + event);
        	}
	}
}

Lastly, the tutorial now relies upon Ant and Ivy to define and retrieve the necessary dependencies. There’s nothing terribly magical about it, the build script should take care of everything for you. Keep in mind that the Red5 JAR dependency is pulled directly from the continuous integration server and should be up to date with the latest found in the Subversion repository at googlecode. If you aren’t running on the latest from trunk, you should strongly consider replacing this JAR with the one found in your Red5 install.

ivy.xml

<ivy-module version="2.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:noNamespaceSchemaLocation="http://ant.apache.org/ivy/schemas/ivy.xsd">
    <info organisation="garagetech" module="tutorials"/>
    <configurations defaultconfmapping="default->*">
        <conf name="compile"/>
        <conf name="default"/>
        <conf name="test" extends="default" description="Unit testing dependencies."/>
    </configurations>
    <dependencies>
        <dependency name="commons-dbcp" org="commons" rev="1.2.2"/>
        <dependency name="commons-lang" org="commons" rev="2.4" conf="compile->*"/>
        <dependency name="dom4j" rev="1.6.1"/>
        <dependency name="ejb3-persistence" rev="" conf="compile->*"/>
        <dependency name="hibernate-annotations" org="hibernate" rev="3.4.0"/>
        <dependency name="hibernate-commons-annotations" org="hibernate" rev="3.4.0"/>
        <dependency name="hibernate-entitymanager" org="hibernate" rev="3.4.0"/>
        <dependency name="hibernate-validator" org="hibernate" rev="3.1.0"/>
        <dependency name="hibernate" org="hibernate" rev="3.3.1"/>
        <dependency name="javassist" rev="3.4"/>
        <dependency name="mysql-connector-java" rev="5.0.6-bin"/>
        <dependency name="red5" rev="" changing="true" conf="compile->*"/>
        <dependency name="slf4j-api" rev="1.5.6" conf="compile->*"/>
        <dependency name="spring-aop" org="spring" rev="2.5.6" conf="compile->*"/>
        <dependency name="spring-beans" org="spring" rev="2.5.6" conf="compile->*"/>
        <dependency name="spring-context" org="spring" rev="2.5.6" conf="compile->*"/>
        <dependency name="spring-core" org="spring" rev="2.5.6" conf="compile->*"/>
        <dependency name="spring-jdbc" org="spring" rev="2.5.6"/>
        <dependency name="spring-orm" org="spring" rev="2.5.6"/>
        <dependency name="spring-tx" org="spring" rev="2.5.6"/>
    </dependencies>
</ivy-module>

That covers the significant changes to the tutorial code. As with the first version, you’ll need to configure MySQL to allow Red5 to talk to it. (Notes on this can be found in the README file with the examples.) You’ll also need to add your user data to the tables once Hibernate has generated the schema.

The example source code for this post can be downloaded here.

1. http://osflash.org/red5 For those that aren’t up on Red5, it is a robust Flash Media Server alternative written entirely in Java that supports multi-user video chat, video streaming and real-time, multi-player gaming.

2. http://hibernate.org Hibernate lets you develop persistent classes following object-oriented idiom – including association, inheritance, polymorphism, composition, and collections. It allows you to express queries in its own portable SQL extension (HQL), as well as in native SQL.

3. http://springframework.org Spring is a layered Java/JEE application framework founded on the simple concepts that any tool should be a pleasure to use, that your application code should not depend on Spring APIs and that it should not compete with existing solutions, but should foster integration.

4. http://mysql.com The MySQL database has become the world’s most popular open source database because of its consistent fast performance, high reliability and ease of use.

    $(document).ready(function() {
        $('#transmit').transmit('http://mysite.com/upload/');
    });

While the plugin is still very much in its infancy and should be considered a work in progress, it is my opinion that it is easier to shake out bugs using an iterative development process. So, keeping that in mind, I’m hoping that a couple of you brave souls will wander over to googlecode and give it a try. Constructive feedback is very much appreciated.