mx.messaging.AbstractConsumer - ActionScript® 3.0 Reference for the Adobe® Flash® Platform

Package	mx.messaging
Class	public class AbstractConsumer
Inheritance	AbstractConsumer MessageAgent EventDispatcher Object
Subclasses	Consumer, MultiTopicConsumer

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

The AbstractConsumer is the base class for both the Consumer and MultiTopicConsumer classes. You use those classes to receive pushed messages from the server.

Public Properties

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	Property		Defined By
		authenticated : Boolean [read-only] Indicates if this MessageAgent is using an authenticated connection to its destination.	MessageAgent
		channelSet : ChannelSet Provides access to the ChannelSet used by the MessageAgent.	MessageAgent
		clientId : String [read-only] Provides access to the client id for the MessageAgent.	MessageAgent
		connected : Boolean [read-only] Indicates whether this MessageAgent is currently connected to its destination via its ChannelSet.	MessageAgent
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		destination : String Provides access to the destination for the MessageAgent.	MessageAgent
		maxFrequency : uint Determines the maximum number of messages per second the Consumer wants to receive.	AbstractConsumer
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		requestTimeout : int Provides access to the request timeout in seconds for sent messages.	MessageAgent
		resubscribeAttempts : 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
		resubscribeInterval : int The number of milliseconds between resubscribe attempts.	AbstractConsumer
		subscribed : Boolean [read-only] Indicates whether the Consumer is currently subscribed.	AbstractConsumer
		timestamp : Number Contains the timestamp of the most recent message this Consumer has received.	AbstractConsumer

Protected Properties

	Property		Defined By
		_shouldBeSubscribed : Boolean Flag indicating whether this consumer should be subscribed or not.	AbstractConsumer

Public Methods

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	Method		Defined By
		AbstractConsumer() Constructs a Consumer.	AbstractConsumer
		acknowledge(ackMsg:AcknowledgeMessage, msg:IMessage):void Invoked by a MessageResponder upon receiving a result for a sent message.	MessageAgent
		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
		channelConnectHandler(event:ChannelEvent):void Handles a CONNECT ChannelEvent.	MessageAgent
		channelDisconnectHandler(event:ChannelEvent):void Handles a DISCONNECT ChannelEvent.	MessageAgent
		channelFaultHandler(event:ChannelFaultEvent):void Handles a ChannelFaultEvent.	MessageAgent
		disconnect():void [override] Disconnects the Consumer from its remote destination.	AbstractConsumer
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	EventDispatcher
		fault(errMsg:ErrorMessage, msg:IMessage):void Invoked by a MessageResponder upon receiving a fault for a sent message.	MessageAgent
		hasEventListener(type:String):Boolean Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		hasPendingRequestForMessage(msg:IMessage):Boolean Returns true if there are any pending requests for the passed in message.	MessageAgent
		initialized(document:Object, id:String):void Called after the implementing object has been created and all properties specified on the tag have been assigned.	MessageAgent
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		logout():void Logs the MessageAgent out from its remote destination.	MessageAgent
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		receive(timestamp:Number = 0):void Requests any messages that are queued for this Consumer on the server.	AbstractConsumer
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	EventDispatcher
		setCredentials(username:String, password:String, charset:String = null):void Sets the credentials that the MessageAgent uses to authenticate to destinations.	MessageAgent
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		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
		subscribe(clientId:String = null):void Subscribes to the remote destination.	AbstractConsumer
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		unsubscribe(preserveDurable:Boolean = false):void Unsubscribes from the remote destination.	AbstractConsumer
		valueOf():Object Returns the primitive value of the specified object.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	EventDispatcher

Protected Methods

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	Method		Defined By
		buildSubscribeMessage():CommandMessage Returns a subscribe message.	AbstractConsumer
		buildUnsubscribeMessage(preserveDurable:Boolean):CommandMessage Returns an unsubscribe message.	AbstractConsumer
		handleAuthenticationFault(errMsg:ErrorMessage, msg:IMessage):void Handles the authentication fault on the server.	MessageAgent
		initChannelSet(message:IMessage):void Used to automatically initialize the channelSet property for the MessageAgent before it connects for the first time.	MessageAgent
		internalSend(message:IMessage, waitForClientId:Boolean = true):void Sends a Message from the MessageAgent to its destination using the agent's ChannelSet.	MessageAgent
		reAuthorize(msg:IMessage):void This function should be overriden by sublasses to implement reauthentication due to server session time-out behavior specific to them.	MessageAgent

Events

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	Summary	Defined By
acknowledge	Dispatched when an acknowledge message is received for a sent message.	MessageAgent
activate	[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.	EventDispatcher
channelConnect	Dispatched when the underlying Channel the MessageAgent is using connects.	MessageAgent
channelDisconnect	Dispatched when the underlying Channel the MessageAgent is using disconnects.	MessageAgent
channelFault	Dispatched when the underlying Channel the MessageAgent is using faults.	MessageAgent
deactivate	[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.	EventDispatcher
fault	Dispatched when a message fault occurs.	MessageAgent
message	Dispatched when a message is received by the Consumer.	AbstractConsumer
propertyChange	Dispatched when the connected property of the MessageAgent changes.	MessageAgent

Property Detail

_shouldBeSubscribed

property

protected var _shouldBeSubscribed:Boolean

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Flag indicating whether this consumer should be subscribed or not.

maxFrequency

property

maxFrequency:uint

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Determines the maximum number of messages per second the Consumer wants to receive. A server that understands this value will use it as an input while it determines how fast to send messages to the Consumer. Default is 0 which means Consumer does not have a preference for the message rate. Note that this property should be set before the Consumer subscribes and any changes after Consumer subscription will not have any effect until Consumer unsubscribes and resubscribes.

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 maxFrequency():uint
public function set maxFrequency(value:uint):void

resubscribeAttempts

property

resubscribeAttempts:int

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

The number of resubscribe attempts that the Consumer makes in the event that the destination is unavailable or the connection to the destination fails. A value of -1 enables infinite attempts. A value of zero disables resubscribe attempts.

Resubscribe attempts are made at a constant rate according to the resubscribe interval value. When a resubscribe attempt is made if the underlying channel for the Consumer is not connected or attempting to connect the channel will start a connect attempt. Subsequent Consumer resubscribe attempts that occur while the underlying channel connect attempt is outstanding are effectively ignored until the outstanding channel connect attempt succeeds or fails.

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 resubscribeAttempts():int
public function set resubscribeAttempts(value:int):void

Related API Elements

mx.messaging.Consumer.resubscribeInterval

resubscribeInterval

property

resubscribeInterval:int

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

The number of milliseconds between resubscribe attempts. If a Consumer doesn't receive an acknowledgement for a subscription request, it will wait the specified number of milliseconds before attempting to resubscribe. Setting the value to zero disables resubscriptions.

Resubscribe attempts are made at a constant rate according to this value. When a resubscribe attempt is made if the underlying channel for the Consumer is not connected or attempting to connect the channel will start a connect attempt. Subsequent Consumer resubscribe attempts that occur while the underlying channel connect attempt is outstanding are effectively ignored until the outstanding channel connect attempt succeeds or fails.

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 resubscribeInterval():int
public function set resubscribeInterval(value:int):void

Throws

ArgumentError — If the assigned value is negative.

Related API Elements

mx.messaging.Consumer.resubscribeInterval

subscribed

property

subscribed:Boolean [read-only]

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Indicates whether the Consumer is currently subscribed. The propertyChange event is dispatched when this property changes.

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 subscribed():Boolean

timestamp

property

timestamp:Number

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Contains the timestamp of the most recent message this Consumer has received. This value is passed to the destination in a receive() call to request that it deliver messages for the Consumer from the timestamp forward. All messages with a timestamp value greater than the timestamp value will be returned during a poll operation. Setting this value to -1 will retrieve all cached messages from the destination.

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 timestamp():Number
public function set timestamp(value:Number):void

Constructor Detail

AbstractConsumer

()

Constructor

public function AbstractConsumer()

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Constructs a Consumer.

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());
       }

Method Detail

buildSubscribeMessage

()

method

protected function buildSubscribeMessage():CommandMessage

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Returns a subscribe message. This method should be overridden by subclasses if they need custom subscribe messages.

Returns

CommandMessage — The subscribe CommandMessage.

buildUnsubscribeMessage

()

method

protected function buildUnsubscribeMessage(preserveDurable:Boolean):CommandMessage

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Returns an unsubscribe message. This method should be overridden by subclasses if they need custom unsubscribe messages.

Parameters

preserveDurable:Boolean — - when true, durable JMS subscriptions are not destroyed allowing consumers to later resubscribe and receive missed messages

Returns

CommandMessage — The unsubscribe CommandMessage.

disconnect

()

method

override public function disconnect():void

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Disconnects the Consumer from its remote destination. This method should be invoked on a Consumer that is no longer needed by an application after unsubscribing. This method does not wait for outstanding network operations to complete and does not send an unsubscribe message to the server. After invoking disconnect(), the Consumer will report that it is in an disconnected, unsubscribed state because it will not receive any more messages until it has reconnected and resubscribed. Disconnecting stops automatic resubscription attempts if they are running.

receive

()

method

public function receive(timestamp:Number = 0):void

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Requests any messages that are queued for this Consumer on the server. This method should only be used for Consumers that subscribe over non-realtime, non-polling channels. This method is a no-op if the Consumer is not subscribed.

Parameters

timestamp:Number (default = 0) — This argument is deprecated and is ignored.

()

method

public function subscribe(clientId:String = null):void

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Subscribes to the remote destination.

Parameters

clientId:String (default = null) — The client id to subscribe with. Use null for non-durable Consumers. If the subscription is durable, a consistent value must be supplied every time the Consumer subscribes in order to reconnect to the correct durable subscription in the remote destination.

Throws

InvalidDestinationError — If no destination is set.

unsubscribe

()

method

public function unsubscribe(preserveDurable:Boolean = false):void

Language Version:

ActionScript 3.0

Product Versions:

BlazeDS 4, Adobe Digital Enterprise Platform Data Services for Java EE 3

Runtime Versions:

Flash Player 9, AIR 1.1

Unsubscribes from the remote destination. In the case of durable JMS subscriptions, this will destroy the durable subscription on the JMS server.

Parameters

preserveDurable:Boolean (default = false) — - when true, durable JMS subscriptions are not destroyed allowing consumers to later resubscribe and receive missed messages

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, Adobe Digital Enterprise Platform Data Services for Java EE 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:

Property	Value
`bubbles`	false
`cancelable`	false
`currentTarget`	The 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`.
`message`	The message associated with this event.
`target`	The 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.

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Classes x

_shouldBeSubscribed

maxFrequency

resubscribeAttempts

resubscribeInterval

subscribed

timestamp

AbstractConsumer

buildSubscribeMessage

buildUnsubscribeMessage

disconnect

receive

subscribe

unsubscribe

message