BlazeDS 3 Installation Guide. Contents. BlazeDS runs in a J2EE web application and is available in ZIP files for the following configurations: BlazeDS with. 07/06 – Published the new version of guide. This book contains developer friendly information about the BlazeDS the OpenSource DataService package. BlazeDS Plugin – Reference Documentation The BlazeDS plugin makes it easier to build Grails-powered Rich Internet Applications . Manual configuration .
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As a result it guie not allow you to work on the Java-based server side of your applications. For high frequency updates this configuration has the overhead of a poll roundtrip for every pushed message and therefore messages can be queued between polls.
In a Spring BlazeDS server, three types of message service components can interact with the Flex message service.
The JPA and Hibernate proxies are replaced with the data that they stand in place of. In other words, it allows your Flex application to access a service available on a different domain than the domain from where the application was downloaded without having to deploy a crossdomain.
BlazeDS remoting services optimally combine a Flex client and a Java server and allow a developer to distribute workload across the wire in ways without necessarily imposing the overheads that loose coupling like XML based interactions over HTTP and web services do.
In addition to the endpoints, BlazeDS includes adapters that provide the critical compatibility between the core BlazeDS Servlet that talks to Flex and a server-side resource such as a JMS resource, a persistent data store, or an Object-Relational mapping layer. Similarly, in the next step, the instance of the ActionScript Product class passed as an argument to the update method of the RemoteObject is deserialized into an instance of the Java version of the Product class at the server-side.
HTTP request-response Web services Remote procedure calls involving objects A possible demoting configuration could be as follows: The settings should look similar to these you may need to adjust the exact folder name based on your own settings: Therefore JMSAdapter comes handy when Flex clients are wired up to send and receive messages to and from enterprise systems that use JMS, whereas ActionScriptAdapter is useful for building systems like chat applications to help communicate between two Flex clients.
ServiceAdapter abstract class sits at the root of the hierarchy. It enables remote procedure calls and message exchanges between the two platforms thereby helping couple together rich and engaging Flash platform based interfaces and robust enterprise servers. All built-in adapter classes inherit from the ServiceAdapter abstract class.
String; public var price: Many of these external systems and libraries, such as messaging infrastructure, database connections and stateless business services, lend themselves to pooling. Clustered instances of BlazeDS share data and messages across instances. Using the Remoting Service, your application can directly invoke methods of Bazeds objects deployed in your application server, and consume the return value. Explaining every bit of the configuration is beyond the scope of blzeds Refcard and is therefore not included.
Each endpoint defines a type and format of communication. In this example, messages are published by Flex clients. A messaging destination represents a topic of real time conversation that interested parties can subscribe listen to or contribute to by posting their own messages.
BlazeDS does not include Java NIO implementations for its communication channels but it’s not very difficult to include one. Among others, the BlazeDS proxy capabilities have three important use cases including:. This channel avoids the overhead of polling and keeps the connection open for the entire scope of communication between the client and the server. Define the ProductDAO class as follows: Program that intercepts all communication between a Flash Player and a Java server.
BlazeDS consists of three key services: You can get both compiled and source versions of the software. BlazeDS has a set of endpoints where a Flex application channel sends requests up to BlazeDS that resides within a Servlet container or an application server.
Inspired by Actual Events: Bare Bones BlazeDS HTTPService Example
It attempts to illustrate some of the most important features of the software and therefore acts as a starting point for developers who are interested in the subject.
In your real-life development or production environment, you would typically integrate BlazeDS in your own web application on your own application server. To create a remoting destination for the ProductDAO class: Invocation of remote Java methods from a Flex application. This Servlet, called MessageBrokerServlet, uses artifacts like channels, endpoints, and adapters to enable proxy, remoting, and messaging services.
As an example a default BlazeDS message broker configuration can then be like so: Using BlazeDS, a messaging destination typically uses either a streaming or a polling guuide.
BlazeDS – Wikipedia
Implement the Product class as follows: In the blazeds-server project, open remoting-config. Select Use remote object access service. The RTMP specification was proprietary until the beginning of this year and has most recently been opened up to public.
Messaging systems involve two typical messaging domains: BlazeDS’s demoting capabilities provide fast and efficient data transmission between a Flex client and a Java server with the help of the binary Action Message Format AMF protocol and the built-in endpoints, channels and adapters to support it.
The Remoting Service allows your Flex application to directly invoke methods of Java objects deployed in your application server. Ensure Use default location is selected. For effective near real-time messaging use one of the following channels: Distributing work optimally between a client and its server is an important challenge when architecting RIA.
In the newly created tutorial-chat project, open the main.
Flex clients use channels to connect to these endpoints. The Proxy Service allows your Flex application to make cross-domain service requests in a secure and controlled manner.
The three alternative serverside message services in Spring BlazeDS are: Because you will work on both the client side and the server side of the applications built in this tutorial, you need to use Flex Builder plug-in configuration and install Flex Builder 3 on top of Eclipse.
Getting started with BlazeDS
Create the messaging destination A messaging destination represents a topic of real time conversation that interested parties can subscribe listen to or contribute to by posting their own messages.
With these brief configuration examples in place, let’s explore BlazeDS’s pull-based or request-response based communication abilities. In this Getting Started tutorial, you will learn how to: In either case, each poll response completes the request.