mx.data.messages.UpdateCollectionMessage (Flex™ 2 Language Reference)

(Adobe^® Flex™ Data Services 2 only)

Package	mx.data.messages
Class	public class UpdateCollectionMessage
Inheritance	UpdateCollectionMessage DataMessage AsyncMessage AbstractMessage Object

This message is used to establish consistency between the remote sequence and the corresponding local collection. It contains all insert and delete operations that were performed on a collection. Clients send this message when a local collection is updated using the collection API (IListView.removeItemAt(), etc) or the Single Managed Object API (DataService.createItem()). The remote destination sends this message when the remote sequence is updated and items are moved or removed and inserted. This body property contains a list of UpdateCollectionRange objects that indicate just how the collection was modified. Applying the update collection ranges inorder will establish a consistent ordering of the items within the specified collection.

Public Properties

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	Property		Defined by
		body : Object The body of a message contains the specific data that needs to be delivered to the remote destination.	AbstractMessage
		clientId : String The clientId indicates which MessageAgent sent the message.	AbstractMessage
		collectionId : Object The unique identifier for the collection that was updated.	UpdateCollectionMessage
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		correlationId : String Provides access to the correlation id of the message.	AsyncMessage
		destination : String The message destination.	AbstractMessage
		headers : Object The headers of a message are an associative array where the key is the header name and the value is the header value.	AbstractMessage
		identity : Object Provides access to the identity map which defines the unique identity of the item affected by this DataMessage (relevant for create/update/delete but not fill operations).	DataMessage
		messageId : String The unique id for the message.	AbstractMessage
		operation : uint Provides access to the operation/command of this DataMessage.	DataMessage
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		replace : Boolean Indicates if the entire collection should be replaced by the contents of this message.	UpdateCollectionMessage
		timestamp : Number Provides access to the time stamp for the message.	AbstractMessage
		timeToLive : Number The time to live value of a message indicates how long the message should be considered valid and deliverable.	AbstractMessage
		updateMode : int Indicates the state of this update.	UpdateCollectionMessage

Public Methods

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	Method		Defined by
		UpdateCollectionMessage() Creates a new instance of an empty UpdateCollectionMessage.	UpdateCollectionMessage
		getOperationAsString(op:uint):String [static] Provides a description of the operation specified.	DataMessage
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		isCreate():Boolean Returns `true` if this is a create operation.	DataMessage
		isEmptyUpdate():Boolean Returns `true` if this message is both an update and its list of property names has a length of zero.	DataMessage
		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
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toString():String Returns a string representation of the message.	AbstractMessage
		valueOf():Object Returns the primitive value of the specified object.	Object

Public Constants

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	Constant		Defined by
		ASSOCIATION_ADD_OPERATION : uint = 13 [static] This operation requests the remote destination add a new association between the specified instances.	DataMessage
		ASSOCIATION_REMOVE_OPERATION : uint = 14 [static] This operation requests the remote destination remove an association between the specified instances.	DataMessage
		BATCHED_OPERATION : uint = 5 [static] This operation represents a set of batched operations to be performed as a single unit.	DataMessage
		CLIENT_UPDATE : int = 0 [static] Indicates this update collection message was client generated.	UpdateCollectionMessage
		COUNT_OPERATION : uint = 9 [static] This operation requests that a configured <count-method> be invoked on a remote destination.	DataMessage
		CREATE_AND_SEQUENCE_OPERATION : uint = 11 [static] This operation requests a create of the specified item from a remote destination.	DataMessage
		CREATE_OPERATION : uint = 0 [static] Indicates a create operation.	DataMessage
		DELETE_OPERATION : uint = 4 [static] This operation indicates that the specified item should be removed.	DataMessage
		DESTINATION_CLIENT_ID_HEADER : String = "DSDstClientId" [static] Messages pushed from the server may arrive in a batch, with messages in the batch potentially targeted to different Consumer instances.	AbstractMessage
		ENDPOINT_HEADER : String = "DSEndpoint" [static] Messages are tagged with the endpoint id for the Channel they are sent over.	AbstractMessage
		FILL_OPERATION : uint = 1 [static] This operation requests that the remote destination create a sequence using the remote destination's adapter.	DataMessage
		GET_OPERATION : uint = 2 [static] This operation requests that the remote destination get a specific managed object based on its unique ID.	DataMessage
		GET_OR_CREATE_OPERATION : uint = 10 [static] This operation requests an item with the specified identity from the remote destination.	DataMessage
		GET_SEQUENCE_ID_OPERATION : uint = 12 [static] This operation requests a sequence id for a set of fill parameters.	DataMessage
		MULTI_BATCH_OPERATION : uint = 6 [static] This operation represents a set of operations to be performed as a single unit but which may contain multiple batched, create, update or delete operations that involve more than one destination, that is, more than one remote adapter.	DataMessage
		PAGE_ITEMS_OPERATION : uint = 20 [static] This operation indicates a request for a page of items specified by identities.	DataMessage
		PAGE_OPERATION : uint = 8 [static] This operation is used to retrieve a page of sequenced content that is delivered across several messages instead of in a single message.	DataMessage
		RELEASE_COLLECTION_OPERATION : uint = 18 [static] This operation indicates that the client is no longer interested in receiving notificaion of operations performed on the specified collection.	DataMessage
		RELEASE_ITEM_OPERATION : uint = 19 [static] This operation indicates that the client is no longer interested in receiving notification of operations performed on the specified item.	DataMessage
		REMOTE_CREDENTIALS_HEADER : String = "DSRemoteCredentials" [static] Messages that need to set remote credentials for a destination carry the Base64 encoded credentials in this header.	AbstractMessage
		REQUEST_TIMEOUT_HEADER : String = "DSRequestTimeout" [static] Messages sent with a defined request timeout use this header.	AbstractMessage
		SERVER_OVERRIDE : int = 2 [static] Indicates this update collection message was client generated and the remote destination determined that it should be reverted on that client.	UpdateCollectionMessage
		SERVER_UPDATE : int = 1 [static] Indicates this update collection message was remotely generated and is based on the current state of the remote sequence.	UpdateCollectionMessage
		SUBTOPIC_HEADER : String = "DSSubtopic" [static] Messages sent by a MessageAgent with a defined `subtopic` property indicate their target subtopic in this header.	AsyncMessage
		TRANSACTED_OPERATION : uint = 7 [static] This operation is similar to the MULTI_BATCH_OPERATION with the addition that the server should encapsulate the multiple batches of messages within a transacation.	DataMessage
		UNKNOWN_OPERATION : uint = 1000 [static] Code for an unknown operation type.	DataMessage
		UPDATE_BODY_CHANGES : uint = 0 [static] This constant is used to access the list of changed property names.	DataMessage
		UPDATE_BODY_NEW : uint = 2 [static] This constant is used to access the new value of a changed item.	DataMessage
		UPDATE_BODY_PREV : uint = 1 [static] This constant is used to access the previous value of the changed item.	DataMessage
		UPDATE_COLLECTION_OPERATION : uint = 17 [static] This operation is sent when a local or remote sequence has been modified by insert(s) or delete(s).	DataMessage
		UPDATE_OPERATION : uint = 3 [static] This operation indicates an update to data object has been performed.	DataMessage

Property detail

collectionId

property

public var collectionId:Object

The unique identifier for the collection that was updated. For a collection filled with the DataService.fill() method this contains and Array of the parameters specified.

replace

property

public var replace:Boolean

Indicates if the entire collection should be replaced by the contents of this message. When the number of changes to a remote sequence have reached a tipping point a replace message is generated as an optimization. When true the body property contains an Array of item identities that should replace any existing items.

updateMode

property

public var updateMode:int

Indicates the state of this update. The remote destination sends update collection messages to clients with one of three update modes:

UpdateCollectionMessage.SERVER_UPDATE - client applies this update collection unconditionally
UpdateCollectionMessage.CLIENT_UPDATE - the committing client does not need to process this update collection.
UpdateCollectionMessage.SERVER_OVERRIDEN - the remote destination modified the update collection message sent by the client and the committing client must revert this update collection.

Constructor detail

UpdateCollectionMessage

()

constructor

public function UpdateCollectionMessage()

Creates a new instance of an empty UpdateCollectionMessage.

Constant detail

CLIENT_UPDATE

constant

public static const CLIENT_UPDATE:int = 0

Indicates this update collection message was client generated.

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