Raghu Nair: Java,JavaFX Tips

I wanted to cover what is new in  JavaFX 1.2 for WebService.

Feed API

Mobile-friendly, streaming API. Each Entry or Item is delivered incrementally as
it is parsed
● Atom: Feed followed by zero or more Entries
● RSS: Channel followed by zero or more Items

FeedTask

The FeedTask abstract class
Base class for Atom and RSS Tasks
► location:String // feed URL
► interval:Duration // poll interval
► onException:function(ex:java.lang.Exception)
► onForeignEvent:function(event:Event)
the onForeignEvent callback reports events that are not in the native namespace

AtomTask

class AtomTask extends FeedTask
► onFeed:function(feed:Feed)
► onEntry:function(entry:Entry)
Example
AtomTask {
     location:”http://blogs.sun.com/.../atom”
     interval:2h
     onFeed:function(feed:Feed) {
          title = feed.title.text
     }
     onEntry:function(entry:Entry) {
          show(entry)
     }
}.start()

RssTask
class RssTask extends FeedTask
► onChannel:function(channel:Channel)
► onItem:function(item:Item)
Example
RssTask {
        location:”http://developers.sun.com/rss/javafx.xml”
        interval:1h
        onChannel:function(channel:Channel) {
             title = channel.title
        }
        onItem:function(item:Item) {
             show(item)
        }
}.start()

Changes in Existing APIs

a) "enqueue" method in HttpRequest  is replaced with "start" method. start makes more sense.

b) HttpRequest Bulk Data Read

"sink" attribute is added in HttpRequest. 

For downloading large For downloading large data, typically media. Specify a destination for data and start as usual
   sink:java.io.OutputStream
   def bos = new java.io.ByteArrayOutputStream()
   def http = HttpRequest {
               location:“http://javafx.com/xyz/test.flv”
               sink: bos
   }.start()
  when done, bos should contain the contents of "http://javafx.com/xyz/test.flv"

 c) HttpRequest: Bulk Data Write.

For uploading large data, typically media. Specify a source of data and start as usual

source:java.io.InputStream
def is = ... // image or video stream
def http = HttpRequest {
       location:“http://cloud.sun.com/uploads”
       method:HttpRequest.POST
       headers:[HttpHeader.basicAuth(user,password)]
       source:is
}.start()

when done, the contents of is should be available at the upload location specified.

e) HttpRequest: Setting Request Headers

Set the headers var to set HTTP request headers

headers:HttpHeader[]
headers: [
  HttpHeader {
        name:HttpHeader.CONTENT_TYPE
        value:”image/jpeg”
  },
  // convenience function for creating an HTTP Basic Auth header
  HttpHeader.basicAuth(username, password)
]

f) HttpRequest: Get Response Headers
Get all header names and values
► responseHeaders:HttpHeader[]
Using callback
► onResponseHeaders:function(headerNames: String[])
Get specific header by name
► getResponseHeaderNames():String[]
► getResponseHeaderValue(name:String):String
Example
def etag = getResponseHeaderValue(HttpHeader.ETAG)