Adobe® Flex® 4 Language Reference
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mx.messaging.channels 
StreamingConnectionHandler 
Packagemx.messaging.channels
Classpublic class StreamingConnectionHandler
InheritanceStreamingConnectionHandler Inheritance EventDispatcher Inheritance Object

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

A helper class that is used by the streaming channels to open an internal HTTP connection to the server that is held open to allow the server to stream data down to the client with no poll overhead.



Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
Protected Properties
 PropertyDefined By
  channel : Channel
The Channel that uses this class.
StreamingConnectionHandler
  chunkBuffer : ByteArray
Byte buffer used to store the current chunk from the remote endpoint.
StreamingConnectionHandler
  dataBytesToRead : int = -1
Counter that keeps track of how many data bytes remain to be read for the current chunk.
StreamingConnectionHandler
  dataOffset : int
Index into the chunk buffer pointing to the first byte of chunk data.
StreamingConnectionHandler
Public Methods
 MethodDefined By
  
Constructor.
StreamingConnectionHandler
 Inherited
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.
EventDispatcher
  
Used by the streaming channels to shut down the streaming connection.
StreamingConnectionHandler
 Inherited
Dispatches an event into the event flow.
EventDispatcher
 Inherited
Checks whether the EventDispatcher object has any listeners registered for a specific type of event.
EventDispatcher
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
  
openStreamingConnection(appendToURL:String = null):void
Used by the streaming channels to set up the streaming connection if necessary and issue the open request to the server.
StreamingConnectionHandler
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Removes a listener from the EventDispatcher object.
EventDispatcher
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
 Inherited
Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.
EventDispatcher
Protected Methods
 MethodDefined By
  
Used by the streamProgressHandler to read a message.
StreamingConnectionHandler
Events
 Event Summary Defined By
 Inherited[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.EventDispatcher
 Inherited[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.EventDispatcher
  Dispatched when the StreamingConnectionHandler receives a status command from the server.StreamingConnectionHandler
Public Constants
 ConstantDefined By
  DISCONNECT_CODE : String = "disconnect"
[static] The code for the StatusEvent dispatched by this handler when a disconnect command is received from the server.
StreamingConnectionHandler
Property Detail

channel

property
protected var channel:Channel

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

The Channel that uses this class.

chunkBuffer

property 
protected var chunkBuffer:ByteArray

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Byte buffer used to store the current chunk from the remote endpoint. Once a full chunk has been buffered, a message instance encoded in binary AMF format can be read from the chunk and dispatched.

dataBytesToRead

property 
protected var dataBytesToRead:int = -1

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Counter that keeps track of how many data bytes remain to be read for the current chunk. A sentinal value of -1 indicates an initial state (either waiting for the first chunk or just finished parsing the previous chunk).

dataOffset

property 
protected var dataOffset:int

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Index into the chunk buffer pointing to the first byte of chunk data.

Constructor Detail

StreamingConnectionHandler

()Constructor
public function StreamingConnectionHandler(channel:Channel, log:ILogger)

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Constructor.

Parameters
channel:Channel — The Channel that uses this class.
 
log:ILogger — Reference to the logger for the associated Channel.
Method Detail

closeStreamingConnection

()method
public function closeStreamingConnection():void

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Used by the streaming channels to shut down the streaming connection.

openStreamingConnection

()method 
public function openStreamingConnection(appendToURL:String = null):void

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Used by the streaming channels to set up the streaming connection if necessary and issue the open request to the server.

Parameters

appendToURL:String (default = null) — The string to append such as session id to the endpoint url while making the streaming connection request.

readMessage

()method 
protected function readMessage():IMessage

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Used by the streamProgressHandler to read a message. Default implementation returns null and subclasses must override this method.

Returns
IMessage — Returns the message that was read.
Event Detail

status

Event
Event Object Type: flash.events.StatusEvent
property StatusEvent.type = flash.events.StatusEvent

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

Dispatched when the StreamingConnectionHandler receives a status command from the server.

Constant Detail

DISCONNECT_CODE

Constant
public static const DISCONNECT_CODE:String = "disconnect"

Language Version: ActionScript 3.0
Product Versions: BlazeDS 4, LiveCycle Data Services 3
Runtime Versions: Flash Player 9, AIR 1.1

The code for the StatusEvent dispatched by this handler when a disconnect command is received from the server.