Blackberry JAVA DEVELOPMENT ENVIRONMENT - - DEVICE APPLICATIONS INTEGRATION - DEVELOPMENT GUIDE Manuel d'utilisateur télécharger pdf (Page 13)

BlackBerry Mobile Data System 13

Feature Description

• Applications can use operations offered by existing web services, which reduces the

amount of coding required and the time that is necessary to create functional

applications.

• It reduces code duplication between applications, which reduces the incremental

memory footprint that is associated with individual applications. It also reduces

complexity for application developers.

• Optimized services for common functionality improve the performance and

responsiveness of BlackBerry MDS Studio applications. A common screen-handling

service enables all BlackBerry MDS Studio applications to have a consistent look and

feel.

Optimized

memory usage

BlackBerry MDS Studio applications are designed to be light-weight. Because web services

or the BlackBerry MDS Runtime manage data processing and storage, a BlackBerry MDS

Studio application is essentially an XML definition of the application components and the

cross-component mappings, plus any scripts or image resources.

Reduced CPU

usage

Because the BlackBerry device performs few of the processing duties that are required by the

BlackBerry MDS Studio application, the burden on the BlackBerry device is much lighter than

in a standard client-server application design model.

Reduced

network traffic

BlackBerry MDS Studio applications are designed to use the limited bandwidth available to

them efficiently. Messages are transmitted between the BlackBerry Enterprise Server and the

web services server using SOAP.

Wireless messages are transmitted between the BlackBerry device and the BlackBerry

Enterprise Server using a compact messaging protocol that is optimized for a wireless

environment. The BlackBerry MDS Runtime and the application integration service contain

the required metadata, which reduces the size of the data that is transmitted wirelessly. The

application integration service manages the mapping between SOAP and the compact

messaging protocol.

Asynchronous

communication

The communication model that is used to transmit application messages between the

BlackBerry device and the remote web service is asynchronous. If an outbound message is

generated when the BlackBerry device is outside of a wireless coverage area, the message is

placed in an outbound queue until a wireless network connection is available. When the

message is placed in this queue, the application continues to function, regardless of whether

the message has been sent. Messages are transmitted from the queue in the background as

soon as the network connection is available.

Similarly, BlackBerry MDS Services are designed to queue inbound messages and send them

to the BlackBerry device when a wireless connection is available. The asynchronous

communication model supports applications that are tolerant to sudden or unpredictable

connection loss. Because BlackBerry MDS Studio applications can store and process data

locally, and because BlackBerry MDS Studio application functionality is designed to be

continually available, BlackBerry device users should be able to access enterprise data at

almost any time.

Pushing

content to

users

BlackBerry MDS Studio applications use WS-Eventing to send information proactively to the

device.

For push events, an outbound message component is designed to be bound at the time of

design to the subscription web service that is associated with the event. An inbound message

is also designed to be bound to the web service event. At runtime, the application can

subscribe to receive the web service event (for example, through BlackBerry device user input

that results in the outbound subscription message being sent). Web service events cause

inbound messages to be sent to the application.

BlackBerry MDS Studio applications can notify BlackBerry device users of inbound messages

in several ways, including a flashing LED, a tune, or a vibration.

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