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HTTPChannel

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

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

The HTTPChannel class provides the HTTP support for messaging. You can configure this Channel to poll the server at an interval to approximate server push. You can also use this Channel with polling disabled to send RPC messages to remote destinations to invoke their methods.

The HTTPChannel relies on network services native to Flash Player and AIR, and exposed to ActionScript by the URLLoader class. This channel uses URLLoader exclusively, and creates a new URLLoader per request.

Channels are created within the framework using the `ServerConfig.getChannel()` method. Channels can be constructed directly and assigned to a ChannelSet if desired.

Channels represent a physical connection to a remote endpoint. Channels are shared across destinations by default. This means that a client targetting different destinations may use the same Channel to communicate with these destinations.

When used in polling mode, this Channel polls the server for new messages based on the `polling-interval-seconds` property in the configuration file, and this can be changed by setting the `pollingInterval` property. The default value is 3 seconds. To enable polling, the channel must be connected and the `polling-enabled` property in the configuration file must be set to `true`, or the `pollingEnabled` property of the Channel must be set to `true`.

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
|  | piggybackingEnabled : Boolean Indicates whether this channel will piggyback poll requests along with regular outbound messages when an outstanding poll is not in progress. | HTTPChannel
|  | polling : Boolean [read-only] Reports whether the channel is actively polling. | HTTPChannel
|  | pollingEnabled : Boolean Indicates whether this channel is enabled to poll. | HTTPChannel
|  | pollingInterval : Number Provides access to the polling interval for this Channel. | HTTPChannel
|  | protocol : String [override] [read-only] Returns the protocol for this channel (http). | HTTPChannel
|  | 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
--- | --- | ---
|  | HTTPChannel(id:String = null, uri:String = null) Constructor. | HTTPChannel
|  | 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

Property Detail

piggybackingEnabled | property

`piggybackingEnabled:Boolean`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Indicates whether this channel will piggyback poll requests along with regular outbound messages when an outstanding poll is not in progress. This allows the server to piggyback data for the client along with its response to client's message.

Implementation
`public function get piggybackingEnabled():Boolean`
`public function set piggybackingEnabled(value:Boolean):void`

polling | property |

`polling:Boolean` [read-only]

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Reports whether the channel is actively polling.

Implementation
`public function get polling():Boolean`

pollingEnabled | property |

`pollingEnabled:Boolean`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Indicates whether this channel is enabled to poll.

Implementation
`public function get pollingEnabled():Boolean`
`public function set pollingEnabled(value:Boolean):void`

pollingInterval | property |

`pollingInterval:Number`

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Provides access to the polling interval for this Channel. The value is in milliseconds. This value determines how often this Channel requests messages from the server, to approximate server push.

Implementation
`public function get pollingInterval():Number`
`public function set pollingInterval(value:Number):void`
Throws

| `ArgumentError` — If the pollingInterval is assigned a value of 0 or less.

protocol | property |

`protocol:String` [read-only] [override]

Language Version : | ActionScript 3.0

Product Versions : | BlazeDS 4, LCDS 3

Runtime Versions : | Flash Player 9, AIR 1.1

Returns the protocol for this channel (http).

Implementation
`public function get protocol():String`
Constructor Detail

HTTPChannel | () | Constructor

`public function HTTPChannel(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

Constructor.

Parameters

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

Sun Mar 5 2017, 03:42 PM +11:00