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PollingChannel

Package | mx.messaging.channels
Class | public class PollingChannel
Inheritance | PollingChannel Channel flash.events.EventDispatcher
Subclasses | HTTPChannel, NetConnectionChannel

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

The PollingChannel class provides the polling behavior that all polling channels in the messaging system require.

Public Properties
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| Property | Defined By
--- | --- | ---
|  | authenticated : Boolean [read-only] Indicates if this channel is authenticated. | Channel
|  | channelSets : Array [read-only] Provides access to the ChannelSets connected to the Channel. | Channel
|  | connected : Boolean [read-only] Indicates whether this channel has established a connection to the remote destination. | Channel
|  | connectTimeout : int Provides access to the connect timeout in seconds for the channel. | Channel
|  | endpoint : String [read-only] Provides access to the endpoint for this channel. | Channel
|  | failoverURIs : Array Provides access to the set of endpoint URIs that this channel can attempt to failover to if the endpoint is clustered. | Channel
|  | id : String Provides access to the id of this channel. | Channel
|  | protocol : String [read-only] Provides access to the protocol that the channel uses. | Channel
|  | reconnecting : Boolean [read-only] Indicates whether this channel is in the process of reconnecting to an alternate endpoint. | Channel
|  | recordMessageSizes : Boolean [read-only] Channel property determines the level of performance information injection - whether we inject message sizes or not. | Channel
|  | recordMessageTimes : Boolean [read-only] Channel property determines the level of performance information injection - whether we inject timestamps or not. | Channel
|  | requestTimeout : int Provides access to the default request timeout in seconds for the channel. | Channel
|  | uri : String Provides access to the URI used to create the whole endpoint URI for this channel. | Channel

Protected Properties
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| Property | Defined By
--- | --- | ---
|  | shouldBeConnected : Boolean [read-only] Indicates whether this channel should be connected to its endpoint. | Channel

Public Methods
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| Method | Defined By
--- | --- | ---
|  | PollingChannel(id:String = null, uri:String = null) Creates a new PollingChannel instance with the specified id. | PollingChannel
|  | applySettings(settings:XML):void Subclasses should override this method to apply any settings that may be necessary for an individual channel. | Channel
|  | connect(channelSet:ChannelSet):void Connects the ChannelSet to the Channel. | Channel
|  | disablePolling():void Disables polling based on the number of times enablePolling() and disablePolling() have been invoked. | PollingChannel
|  | disconnect(channelSet:ChannelSet):void Disconnects the ChannelSet from the Channel. | Channel
|  | enablePolling():void Enables polling based on the number of times enablePolling() and disablePolling() have been invoked. | PollingChannel
|  | logout(agent:MessageAgent):void Sends a CommandMessage to the server to logout if the Channel is connected. | Channel
|  | poll():void Initiates a poll operation if there are consumers subscribed to this channel, and polling is enabled for this channel. | PollingChannel
|  | send(agent:MessageAgent, message:IMessage):void [override] Sends the specified message to its target destination. | PollingChannel
|  | setCredentials(credentials:String, agent:MessageAgent = null, charset:String = null):void Sets the credentials to the specified value. | Channel

Protected Methods
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| Method | Defined By
--- | --- | ---
|  | applyClientLoadBalancingSettings(props:XML):void Applies the client load balancing urls if they exists. | Channel
|  | connectFailed(event:ChannelFaultEvent):void Processes a failed internal connect and dispatches the FAULT event for the channel. | Channel
|  | connectSuccess():void Processes a successful internal connect and dispatches the CONNECT event for the Channel. | Channel
|  | connectTimeoutHandler(event:TimerEvent):void Handles a connect timeout by dispatching a ChannelFaultEvent. | Channel
|  | disconnectFailed(event:ChannelFaultEvent):void Processes a failed internal disconnect and dispatches the FAULT event for the channel. | Channel
|  | disconnectSuccess(rejected:Boolean = false):void Processes a successful internal disconnect and dispatches the DISCONNECT event for the Channel. | Channel
|  | flexClientWaitHandler(event:PropertyChangeEvent):void Handles a change to the guard condition for managing initial Channel connect for the application. | Channel
|  | getMessageResponder(agent:MessageAgent, message:IMessage):MessageResponder Returns the appropriate MessageResponder for the Channel's send() method. | Channel
|  | internalConnect():void Connects the Channel to its endpoint. | Channel
|  | internalDisconnect(rejected:Boolean = false):void Disconnects the Channel from its endpoint. | Channel
|  | internalSend(messageResponder:MessageResponder):void Sends the Message out over the Channel and routes the response to the responder. | Channel

Events
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| Event | Summary | Defined By
--- | --- | --- | ---
|  | channelConnect | Dispatched after the channel has connected to its endpoint. | Channel
|  | channelDisconnect | Dispatched after the channel has disconnected from its endpoint. | Channel
|  | channelFault | Dispatched after the channel has faulted. | Channel
|  | message | Dispatched when a channel receives a message from its endpoint. | Channel
|  | propertyChange | Dispatched when a property of the channel changes. | Channel

Protected Constants
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| Constant | Defined By
--- | --- | ---
|  | CONNECT_TIMEOUT_SECONDS : String = connect-timeout-seconds [static] | Channel
|  | ENABLE_SMALL_MESSAGES : String = enable-small-messages [static] | Channel
|  | FALSE : String = false [static] | Channel
|  | LOGIN_AFTER_DISCONNECT : String = login-after-disconnect [static] | PollingChannel
|  | PIGGYBACKING_ENABLED : String = piggybacking-enabled [static] | PollingChannel
|  | POLLING_INTERVAL_LEGACY : String = polling-interval-seconds [static] | PollingChannel
|  | POLLING_INTERVAL_MILLIS : String = polling-interval-millis [static] | PollingChannel
|  | RECORD_MESSAGE_SIZES : String = record-message-sizes [static] | Channel
|  | RECORD_MESSAGE_TIMES : String = record-message-times [static] | Channel
|  | REQUEST_TIMEOUT_SECONDS : String = request-timeout-seconds [static] | Channel
|  | SERIALIZATION : String = serialization [static] | Channel
|  | TRUE : String = true [static] | Channel

Constructor Detail

PollingChannel | () | Constructor

`public function PollingChannel(id:String = null, uri:String = null)`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Creates a new PollingChannel instance with the specified id. Once a PollingChannel is connected and begins polling, it will issue a poll request once every three seconds by default.

Note: The PollingChannel type should not be constructed directly. Instead create instances of protocol specific subclasses such as HTTPChannel or AMFChannel that extend it.

Parameters

| `id:String` (default = `null`)`` — The id of this Channel.
| `uri:String` (default = `null`)`` — The uri for this Channel.

Method Detail

disablePolling | () | method

`public function disablePolling():void`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Disables polling based on the number of times `enablePolling()` and `disablePolling()` have been invoked. If the net result is to disable polling the channel stops polling.

Invoked automatically based upon subscribing or unsubscribing from a remote destination over a PollingChannel.

enablePolling | () | method |

`public function enablePolling():void`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Enables polling based on the number of times `enablePolling()` and `disablePolling()` have been invoked. If the net result is to enable polling the channel will poll the server on behalf of connected MessageAgents.

Invoked automatically based upon subscribing or unsubscribing from a remote destination over a PollingChannel.

poll | () | method |

`public function poll():void`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Initiates a poll operation if there are consumers subscribed to this channel, and polling is enabled for this channel. Note that this method will not start a new poll if one is currently in progress.

send | () | method |

`override public function send(agent:MessageAgent, message:IMessage):void`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Sends the specified message to its target destination. Subclasses must override the `internalSend()` method to perform the actual send. `PollingChannel` will wrap outbound messages in poll requests if a poll is not currently outstanding.

Parameters

| `agent:MessageAgent` — The MessageAgent that is sending the message.
| `message:IMessage` — The Message to send.

Throws

| `InvalidDestinationError` — If neither the MessageAgent nor the message specify a destination.

Constant Detail

LOGIN_AFTER_DISCONNECT | Constant

`protected static const LOGIN_AFTER_DISCONNECT:String = login-after-disconnect`

PIGGYBACKING_ENABLED | Constant |

`protected static const PIGGYBACKING_ENABLED:String = piggybacking-enabled`

POLLING_INTERVAL_LEGACY | Constant |

`protected static const POLLING_INTERVAL_LEGACY:String = polling-interval-seconds`

POLLING_INTERVAL_MILLIS | Constant |

`protected static const POLLING_INTERVAL_MILLIS:String = polling-interval-millis`

Wed Nov 15 2017, 09:50 AM +01:00