Adobe® Flex® 4 Language Reference
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mx.messaging 
Consumer 
Packagemx.messaging
Classpublic class Consumer
InheritanceConsumer Inheritance AbstractConsumer Inheritance MessageAgent 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 Consumer subscribes to a destination to receive messages. Consumers send subscribe and unsubscribe messages which generate a MessageAckEvent or MessageFaultEvent depending upon whether the operation was successful or not. Once subscribed, a Consumer dispatches a MessageEvent for each message it receives. Consumers provide the ability to filter messages using a selector. These selectors must be understood by the destination.

MXML SyntaxexpandedHide MXML Syntax

The <mx:Consumer> tag inherits all the tag attributes of its superclass, and adds the following tag attributes:

   <mx:Consumer
    Properties
    resubscribeAttempts="5"
    resubscribeInterval="5000"
    selector="No default."
    timestamp="No default."
  />
  


Public Properties
 PropertyDefined By
 Inheritedauthenticated : Boolean
[read-only] Indicates if this MessageAgent is using an authenticated connection to its destination.
MessageAgent
 InheritedchannelSet : ChannelSet
Provides access to the ChannelSet used by the MessageAgent.
MessageAgent
 InheritedclientId : String
[read-only] Provides access to the client id for the MessageAgent.
MessageAgent
 Inheritedconnected : Boolean
[read-only] Indicates whether this MessageAgent is currently connected to its destination via its ChannelSet.
MessageAgent
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 Inheriteddestination : String
Provides access to the destination for the MessageAgent.
MessageAgent
 InheritedmaxFrequency : uint
Determines the maximum number of messages per second the Consumer wants to receive.
AbstractConsumer
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
 InheritedrequestTimeout : int
Provides access to the request timeout in seconds for sent messages.
MessageAgent
 InheritedresubscribeAttempts : int
The number of resubscribe attempts that the Consumer makes in the event that the destination is unavailable or the connection to the destination fails.
AbstractConsumer
 InheritedresubscribeInterval : int
The number of milliseconds between resubscribe attempts.
AbstractConsumer
  selector : String
The selector for the Consumer.
Consumer
 Inheritedsubscribed : Boolean
[read-only] Indicates whether the Consumer is currently subscribed.
AbstractConsumer
  subtopic : String
Provides access to the subtopic for the remote destination that the MessageAgent uses.
Consumer
 Inheritedtimestamp : Number
Contains the timestamp of the most recent message this Consumer has received.
AbstractConsumer
Protected Properties
 PropertyDefined By
 Inherited_shouldBeSubscribed : Boolean
Flag indicating whether this consumer should be subscribed or not.
AbstractConsumer
Public Methods
 MethodDefined By
  
Consumer(messageType:String = "flex.messaging.messages.AsyncMessage")
Constructor.
Consumer
 Inherited
Invoked by a MessageResponder upon receiving a result for a sent message.
MessageAgent
 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
 Inherited
Handles a CONNECT ChannelEvent.
MessageAgent
 Inherited
Handles a DISCONNECT ChannelEvent.
MessageAgent
 Inherited
Handles a ChannelFaultEvent.
MessageAgent
 Inherited
[override] Disconnects the Consumer from its remote destination.
AbstractConsumer
 Inherited
Dispatches an event into the event flow.
EventDispatcher
 Inherited
Invoked by a MessageResponder upon receiving a fault for a sent message.
MessageAgent
 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
Returns true if there are any pending requests for the passed in message.
MessageAgent
 Inherited
Called after the implementing object has been created and all properties specified on the tag have been assigned.
MessageAgent
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Logs the MessageAgent out from its remote destination.
MessageAgent
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
receive(timestamp:Number = 0):void
Requests any messages that are queued for this Consumer on the server.
AbstractConsumer
 Inherited
removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void
Removes a listener from the EventDispatcher object.
EventDispatcher
 Inherited
setCredentials(username:String, password:String, charset:String = null):void
Sets the credentials that the MessageAgent uses to authenticate to destinations.
MessageAgent
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
setRemoteCredentials(username:String, password:String, charset:String = null):void
Sets the remote credentials that will be passed through to the remote destination for authenticating to secondary systems.
MessageAgent
 Inherited
subscribe(clientId:String = null):void
Subscribes to the remote destination.
AbstractConsumer
 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
unsubscribe(preserveDurable:Boolean = false):void
Unsubscribes from the remote destination.
AbstractConsumer
 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
 Inherited
Returns a subscribe message.
AbstractConsumer
 Inherited
Returns an unsubscribe message.
AbstractConsumer
 Inherited
Used to automatically initialize the channelSet property for the MessageAgent before it connects for the first time.
MessageAgent
 Inherited
internalSend(message:IMessage, waitForClientId:Boolean = true):void
Sends a Message from the MessageAgent to its destination using the agent's ChannelSet.
MessageAgent
 Inherited
This function should be overriden by sublasses to implement re-authorization due to server session time-out behavior specific to them.
MessageAgent
Events
 Event Summary Defined By
 InheritedDispatched when an acknowledge message is received for a sent message.MessageAgent
 Inherited[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.EventDispatcher
 InheritedDispatched when the underlying Channel the MessageAgent is using connects.MessageAgent
 InheritedDispatched when the underlying Channel the MessageAgent is using disconnects.MessageAgent
 InheritedDispatched when the underlying Channel the MessageAgent is using faults.MessageAgent
 Inherited[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.EventDispatcher
 InheritedDispatched when a message fault occurs.MessageAgent
  Dispatched when a message is received by the Consumer.Consumer
 InheritedDispatched when the connected property of the MessageAgent changes.MessageAgent
Property Detail

selector

property
selector:String

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

The selector for the Consumer. This is an expression that is passed to the destination which uses it to filter the messages delivered to the Consumer.

Before a call to the subscribe() method, this property can be set with no side effects. After the Consumer has subscribed to its destination, changing this value has the side effect of updating the Consumer's subscription to use the new selector expression immediately.

The remote destination must understand the value of the selector expression.

This property can be used as the source for data binding. When this property is modified, it dispatches the propertyChange event.



Implementation
    public function get selector():String
    public function set selector(value:String):void

subtopic

property 
subtopic:String

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

Provides access to the subtopic for the remote destination that the MessageAgent uses.

This property can be used as the source for data binding. When this property is modified, it dispatches the propertyChange event.



Implementation
    public function get subtopic():String
    public function set subtopic(value:String):void
Constructor Detail

Consumer

()Constructor
public function Consumer(messageType:String = "flex.messaging.messages.AsyncMessage")

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

Constructor.

Parameters
messageType:String (default = "flex.messaging.messages.AsyncMessage") — The alias for the message type processed by the service hosting the remote destination the Consumer will subscribe to. This parameter is deprecated and it is ignored by the constructor.

Example  ( How to use this example )
       function initConsumer():void
       {
           var consumer:Consumer = new Consumer();
           consumer.destination = "NASDAQ";
           consumer.selector = "operation IN ('Bid','Ask')";
           consumer.addEventListener(MessageEvent.MESSAGE, messageHandler);
           consumer.subscribe();
       }
     
       function messageHandler(event:MessageEvent):void
       {
           var msg:IMessage = event.message;
           var info:Object = msg.body;
           trace("-App recieved message: " + msg.toString());
       }
       
Event Detail

message

Event
Event Object Type: mx.messaging.events.MessageEvent
property MessageEvent.type = mx.messaging.events.MessageEvent.MESSAGE

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

Dispatched when a message is received by the Consumer.

The MESSAGE event type; dispatched upon receipt of a message.

The value of this constant is "message".

The properties of the event object have the following values:

PropertyValue
bubblesfalse
cancelablefalse
currentTargetThe Object that defines the event listener that handles the event. For example, if you use myButton.addEventListener() to register an event listener, myButton is the value of the currentTarget.
messageThe message associated with this event.
targetThe Object that dispatched the event; it is not always the Object listening for the event. Use the currentTarget property to always access the Object listening for the event.