AbstractOperation  - AS3 Flex

An ordered list of the names of the arguments to pass to a method invocation. Since the arguments object is a hashmap with no guaranteed ordering, this array helps put everything together correctly. It will be set automatically by the MXML compiler, if necessary, when the Operation is used in tag form.

Value that indicates how to handle multiple calls to the same service. The default value is multiple. The following values are permitted:

• multiple Existing requests are not cancelled, and the developer is responsible for ensuring the consistency of returned data by carefully managing the event stream. This is the default value.
• single Only a single request at a time is allowed on the operation; multiple requests generate a fault.
• last Making a request cancels any existing request.

Type of content for service requests. The default is application/x-www-form-urlencoded which sends requests like a normal HTTP POST with name-value pairs. application/xml send requests as XML.

Custom HTTP headers to be sent to the third party endpoint. If multiple headers need to be sent with the same name the value should be specified as an Array.

HTTP method for sending the request. Permitted values are GET, POST, HEAD, OPTIONS, PUT, TRACE and DELETE. Lowercase letters are converted to uppercase letters. The default value is GET.

Object of name-value pairs used as parameters to the URL. If the contentType property is set to application/xml, it should be an XML document.

Provides access to the request timeout in seconds for sent messages. If an acknowledgement, response or fault is not received from the remote destination before the timeout is reached the message is faulted on the client. A value less than or equal to zero prevents request timeout.

Value that indicates how you want to deserialize the result returned by the HTTP call. The value for this is based on the following:

• Whether you are returning XML or name/value pairs.
• How you want to access the results; you can access results as an object, text, or XML.

The default value is object. The following values are permitted:

• object The value returned is XML and is parsed as a tree of ActionScript objects. This is the default.
• array The value returned is XML and is parsed as a tree of ActionScript objects however if the top level object is not an Array, a new Array is created and the result set as the first item. If makeObjectsBindable is true then the Array will be wrapped in an ArrayCollection.
• xml The value returned is XML and is returned as literal XML in an ActionScript XMLnode object.
• flashvars The value returned is text containing name=value pairs separated by ampersands, which is parsed into an ActionScript object.
• text The value returned is text, and is left raw.
• e4x The value returned is XML and is returned as literal XML in an ActionScript XML object, which can be accessed using ECMAScript for XML (E4X) expressions.

The URL that the HTTPService object should use when computing relative URLs. This property is only used when going through the proxy. When the useProxy property is set to false, the relative URL is computed automatically based on the location of the SWF running this application. If not set explicitly rootURL is automatically set to the URL of mx.messaging.config.LoaderConfig.url.

A SerializationFilter can control how the arguments are formatted to form the content of the HTTP request. It also controls how the results are converted into ActionScript objects. It can be set either explicitly using this property or indirectly using the resultFormat property.

If true, a busy cursor is displayed while a service is executing. The default value is false.

Location of the service. If you specify the url and a non-default destination, your destination in the services-config.xml file must allow the specified URL.

Specifies whether to use the Flex proxy service. The default value is false. If you do not specify true to proxy requests though the Flex server, you must ensure that the player can reach the target URL. You also cannot use destinations defined in the services-config.xml file if the useProxy property is set to false.

預設值為 false。

ActionScript function used to decode a service result from XML. When the resultFormat is an object and the xmlDecode property is set, Flex uses the XML that the HTTPService returns to create an Object. If it is not defined the default XMLDecoder is used to do the work.

The function referenced by the xmlDecode property must take a flash.xml.XMLNode object as a parameter and should return an Object. It can return any type of object, but it must return something. Returning null or undefined causes a fault.

   <mx:HTTPService id="hs" xmlDecode="xmlDecoder" url="myURL" resultFormat="object" contentType="application/xml">
        <mx:request><source/>
            <obj>{RequestObject}</obj>
        </mx:request>
   </mx:HTTPService>

function xmlDecoder (myXML)
{
 // Simplified decoding logic.
 var myObj = {};
 myObj.name = myXML.firstChild.nodeValue;
 myObj.honorific = myXML.firstChild.attributes.honorific;
 return myObj;
}

ActionScript function used to encode a service request as XML. When the contentType of a request is application/xml and the request object passed in is an Object, Flex attempts to use the function specified in the xmlEncode property to turn it into a flash.xml.XMLNode object If the xmlEncode property is not set, Flex uses the default XMLEncoder to turn the object graph into a flash.xml.XMLNode object.

The xmlEncode property takes an Object and should return a flash.xml.XMLNode object. In this case, the XMLNode object can be a flash.xml.XML object, which is a subclass of XMLNode, or the first child of the flash.xml.XML object, which is what you get from an <mx:XML> tag. Returning the wrong type of object causes a fault. The following example shows an <mx:HTTPService> tag that specifies an xmlEncode function:

  <mx:HTTPService id="hs" xmlEncode="xmlEncoder" url="myURL" resultFormat="object" contentType="application/xml">
        <mx:request><source/>
            <obj>{RequestObject}</obj>
        </mx:request>
   </mx:HTTPService>
    

function xmlEncoder (myObj)
{
  return new XML("");
}

Creates a new Operation.

Returns the HTTP request headers. Subclasses can override this method to control the retrieval of the HTTP request headers.

Returns the serialization filter. Subclasses can override this method to control the retrieval of the HTTP request headers.

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