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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The other three are as follows: The reason for this special need arises because of the way BlazeDS serializes data across the wire. All built-in adapter classes inherit from the ServiceAdapter abstract class.
Getting started with BlazeDS
To subscribe to a destination, you use the subscribe method of the Consumer class. To start the sample database: The Remoting Service allows your Flex application to directly invoke methods of Java objects deployed in your application server. Workload distribution Distributing work optimally between a client and its server is an important challenge when architecting RIA. Adapters are also configured in services-config. You can get both compiled and source versions of the software.
Management of connection types between Flex and Java. The settings should look similar to these you may need to adjust the exact folder based on your own settings: Simply put, at the heart of BlazeDS is a Servlet that bootstraps the infrastructure that intercepts all calls between a Flex client and the BlazeDS instance.
Off the shelf, the Flex framework includes three methods of pull-based communication and data interchange with external data sources:.
A key element of a destination blazedz the channel used to exchange data between the client and the server. The BlazeDS turnkey server is a ready-to-use version of Tomcat currently version 6.
As an example a default BlazeDS message broker configuration can then be like so: Robust Connection Non-blocking channels allow for greater number of connections to be served provided they are not all active at the same time always.
The configuration file services-config. Learn about Adobe’s tool for coupling together Flash platform-based interfaces with robust Java enterprise servers.
Install the Flex Builder 3 plug-in.
Getting Started with BlazeDS
Configurable web application that can be clustered and used in cases that desire a higher than normal performance. Product; private function update: 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.
Abstract classes not only define a contract like interfaces do but also define behavior through partial method implementations. Run and test the application.
The other three gyide as follows:.
Inspired by Actual Events: Bare Bones BlazeDS HTTPService Example
This Blazfds, called MessageBrokerServlet, uses artifacts like channels, endpoints, and adapters to enable proxy, blazesd, and messaging services. Create a Java project You will need a Java project to work on the server side of the applications built in this tutorial.
Building a messaging application. Data pushing in a web application context implies the server sending data to a browser-based client without the client necessarily requesting it. Many of these external blazees and libraries, such as messaging infrastructure, database connections and stateless business services, lend themselves to pooling.
Therefore, message producers connected to a clustered server instance can send messages to message consumers connected to a different server within the same cluster. Clustered instances of BlazeDS share data and messages across instances. The messaging service in Flex itself is agnostic to the messaging protocol used on the server side.
Select Java Project in the project type tree and click Next.
Install Eclipse and the Flex Builder 3 plug-in Note: This Refcard provides a quick overview of BlazeDS. Structural Definition BlazeDS is a: A polling channel can be configured with a polling interval, or it can be set up to wait for data at the server-side if data is not immediately available this approach is generally referred to as long polling.
To define the simple chat destination for this application: BlazeDS is a set of data services that significantly simplify the development of data-driven Rich Internet Applications, and dramatically improve the performance of their data access operations. AsyncMessage; private function send: A second transient connection, drawn from the browser pool, is needed only when data is sent to the server.
If the accessed data is not changing during the course of its reuse it always makes sense to cache it. This channel avoids the overhead of polling and keeps the connection open for the entire scope of communication between the client and the server. The client sends a recurring request to the server at a predefined frequency.
Analogously, the Flex client defines a set of channels that vary depending on the type and format of communication. The open source dsadapters project http: Therefore, any Hibernate adapter needs blaxeds preserve the proxy characteristics blazede keeping the standard behavior of the essential serialization and deserialization mechanism between Flex and Java intact. RemoteObject calls are asynchronous. The method can return a value of a primitive data type, an object, a collection of objects, an object graph, and more.
There is plenty more, including use of annotations, possible for configuring Spring Beans as remoting destinations and you may want blzeds learn more online from the Spring BlazeDS project site mentioned earlier in this paragraph. Only a couple of quick examples are shown to give you a flavor the typical configuration elements.
BlazeDS has acces to all resource pooling strategies that b,azeds Java EE web application running in an application server has.
You can download Eclipse at: The channel issues polls to the server to fetch data but if no data is available it waits until data arrives for the client or the configured server wait interval elapses. You will need a Java project to work on the server side of the applications built in this tutorial.