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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Create the remoting destination A Remoting destination exposes a Java class that your Flex application can invoke remotely. Off the shelf, the Flex blaazeds includes three methods of pull-based communication and data interchange with external data sources: As an example a default BlazeDS message broker configuration can then be like so: In this example, messages are published by Flex clients.
A default configuration file, called services-config. Translation of Java objects returned from a server, in response to the remote method call, to corresponding AS3 objects.
As a result it does not allow you to work on the Java-based server side of your applications. Although it’s mentioned upfront that BlazeDS helps connect Flash platform applications to Java, it’s important to define it a bit further.
As data from a BlazeDS server leaves for the Flex client, it can be intercepted using the familiar Java Servlet filter mechanism.
Simply put, at the heart of BlazeDS bpazeds a Servlet that bootstraps the infrastructure that intercepts all calls between a Flex client and the BlazeDS instance. Run the application Click the Run icon in the Eclipse toolbar to start the application Open the same URL in another browser window to start a second instance of the chat application Type a message in one of the chat clients and click “Send”: BlazeDS based message services leverage two types of built-in adapters, namely: To start the sample database: With blwzeds brief configuration examples in place, let’s explore BlazeDS’s pull-based or request-response yuide communication abilities.
Besides, remoting the Spring messaging and security benefits also get extended to Flex applications. Caching is a timetested way of increasing performance by avoiding data fetches across the network and using pre-fetched local data instead. The top level and the first of these four is services-config.
Therefore, any Hibernate adapter needs to preserve the proxy characteristics while keeping the standard behavior of the essential serialization and deserialization mechanism between Flex and Java intact. ServiceAdapter abstract class sits at the root of the hierarchy.
Getting started with BlazeDS | Adobe Developer Connection
This Servlet, called MessageBrokerServlet, uses artifacts like channels, endpoints, and adapters to enable proxy, remoting, and messaging services. Therefore, message producers connected to a clustered server instance can send messages to message consumers connected to a different server within the same cluster. One is needed for the streamed response from the server to the client that the channel hangs on to.
Select Web Application as the application type. The three alternative serverside message services in Spring Blazevs are:. Program that intercepts all communication between a Flash Player and a Java server.
For beginners, it’s convenient, appropriate guice advisable to get the latest release version of the binary turnkey distribution. In the blazeds-server project, open remoting-config. Many of these external systems and libraries, such as messaging infrastructure, database connections glazeds stateless business services, lend themselves to pooling.
Concurrent contracts Cross-domain utility layer Functional decomposition Rules centralization State repository Caching If the accessed data is not changing during the course of its reuse it always makes sense to cache it. BlazeDS remoting services optimally combine a Flex client and a Java server and allow a developer to distribute workload across the wire in ways gujde necessarily imposing the overheads that loose coupling like XML based interactions over HTTP and web services do.
When an incoming or outgoing message hits the filter, serialization and deserialization occur.
BlazeDS is a Java Servlet based web application, so it integrates and works with the Spring framework facility that addresses the web layer. The ProductDAO class provides the data access logic to retrieve and update products Products are transferred between the client and the server using Product objects value objects.
When resources are pooled, they are shared over multiple clients. Resource Pooling Guidr of these external systems and libraries, such as messaging infrastructure, guuide connections and stateless business services, lend themselves to pooling.
HTTP request-response Web services Remote procedure calls involving objects A possible demoting configuration could be as follows: Messaging systems involve two typical messaging domains: BlazeDS can logically support both messaging domains.
Select J2EE as the application server type. Among others, the BlazeDS proxy capabilities have three important use cases including:. Some of these are in-built, and some can be obtained from open source projects or can be custom built. String; public var price: Install the Flex Builder 3 plug-in. 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.
Getting Started with BlazeDS
Create a Boazeds project You will need a Java project to work on the server side of the applications built in this tutorial. Among others, the BlazeDS proxy capabilities have three important use cases including: Endpoints reside at the BlazeDS end.
Usage of Java NIO provides for scalable connections as blocking connections are replaced by non-blocking asynchronous counterparts. A common design pattern used to solve this problem is what I like to call the “Clone and Merge Transfer Pattern. If the accessed data is not changing during the course of its reuse it always makes sense to cache it.
Extending the scope of these frameworks to include interactions with Flex clients allows seamless persistence management. In addition, one of the binary versions comes in the form of a turnkey distribution that includes a configured copy of the Apache Tomcat Servlet container within the bundle.
Adapters are also configured in services-config. 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 Blazedd Format AMF protocol and the built-in endpoints, channels and adapters to support it. Add a destination called tutorial-product defined as follows: In this Getting Started tutorial, you will learn how to: Using the Remoting Service, your application can ghide invoke methods blazesd Java objects deployed in your application server, and consume the return value.