MACROMEDIA FLASH COMMUNICATION SERVER MX-SERVER-SIDE COMMUNICATION ACTIONSCRIPT DICTIONARY Spécifications télécharger pdf (Page 107)

About Flash Communication Server Applications 29

Finally, here’s an overview of the remote shared object flow. A Flash client movie subscribes to a

remote shared object by issuing a

SharedObject.getRemote command, and provides a

SharedObject.onSync method with it. The client then connects the remote shared object to the

NetConnection object by issuing a

SharedObject.connect command. The server sends out a

synchronization message for the shared object, but no method on the server side is invoked. This

synchronization message causes the

SharedObject.onSync method on the client to be called.

When the client, the server, or any other movie instance makes a change to the shared object, the

server again sends out a synchronization message for the shared object. Again, no server method is

called, and the synchronization message from the server causes the

SharedObject.onSync

method on each client to be called.

Shared object flow

Designing Flash Communication Server applications

Now that you have a basic understanding of the structure and capabilities of Flash

Communication Server, you need to consider how to design your own applications to best take

advantage of client-side and server-side scripting.

When designing a Flash Communication Server application, determine what capabilities it will

have, what it requires of the server, and whether the application’s capabilities call only for client-

side ActionScript or for server-side ActionScript as well. If you want the server to act as a conduit

for your audio, video, and text streams, you might need only client-side ActionScript; if you want

the server to process data, you’ll need to write server-side ActionScript as well.

Although building client-server applications may seem complicated, in many cases it is easier to

write a small amount of server-side code than it is to handle everything in client-side code. (Of

course, in some cases, only server-side code can accomplish certain tasks.) For example, server-

side scripts can act as a “gatekeeper” for your application; by setting certain data on the server, you

can eliminate race conditions (multiple clients attempting to perform the same task at the same

time) and may eliminate the need for client-side code to handle conflict resolution.

SERVER FLOW

Sync

(Initialize data)

Sync

(Update data)

CLIENT 1 FLOW

onSync

"clear"

obj1.data.x=4

onSync

"success"

getRemote("obj1")

connect

CLIENT 2 FLOW

onSync

"clear"

onSync

"change"

getRemote("obj1")

connect

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