MACROMEDIA FLASH MEDIA SERVER 2-SERVER MANAGEMENT ACTIONSCRIPT LANGUAGE Instrukcja Użytkownika Pobierz pdf (Strona 87)

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Server-Side ActionScript Language Reference

You c an a l s o c a l l SharedObject.get() to get a reference to a shared object that is in a namespace of another appli-

cation instance. This instance can be on the same server or on a different server and is called a proxied shared object.

To get a reference to a shared object from another instance, create a NetConnection object and use the

NetCon-

nection.connect()

method to connect to the application instance that owns the shared object. Pass the NetCon-

nection object as the

netConnection parameter of the SharedObject.get() method. The server-side script must

get a reference to a proxied shared object before there is a request for the shared object from any client. To do this,

call

SharedObject.get() in the application.onAppStart() handler.

If you call

SharedObject.get() with a netConnection parameter and the local application instance already has a

shared object with the same name, the shared object is converted to a proxied shared object. All shared object

messages for clients that are connected to a proxied shared object are sent to the master instance.

If the connection state of the NetConnection object that was used as the

netConnection parameter changes state

from connected to disconnected, the proxied shared object is set to idle and any messages received from subscribers

are discarded. The

NetConnection.onStatus() handler is called when a connection is lost. You can then

reestablish a connection to the remote instance and call

SharedObject.get(), which changes the state of the

proxied shared object from idle to connected.

If you call

SharedObject.get() with a new NetConnection object on a proxied shared object that is already

connected, and if the URI of the new NetConnection object doesn’t match the current NetConnection object, the

proxied shared object unsubscribes from the previous shared object, sends a

clear event to all subscribers, and

subscribes to the new shared object instance. When a subscribe operation to a proxied shared object is successful, all

subscribers are reinitialized to the new state. This process lets you migrate a shared object from one application

instance to another without disconnecting the clients.

Updates received by proxied shared objects from subscribers are checked to see if the update can be rejected based

on the current state of the proxied shared object version and the version of the subscriber. If the change can be

rejected, the proxied shared object doesn’t forward the message to the remote instance; the reject message is sent to

the subscriber.

The corresponding client-side ActionScript method is

SharedObject.getRemote().

Example

The following example creates a shared object named

foo in the function onProcessCmd(). The function is passed

a parameter,

cmd, that is assigned to a property in the shared object.

function onProcessCmd(cmd){

// Insert code here.

var shObj = SharedObject.get("foo", true);

propName = cmd.name;

shObj.getProperty (propName, cmd.newAddress);

}

The following example uses a proxied shared object. A proxied shared object resides on a server or in an application

instance (called master) that is different from the server or application instance that the client connects to (called

proxy). When the client connects to the proxy and gets a remote shared object, the proxy connects to the master and

gives the client a reference to this shared object. The following code is in the main.asc file:

application.appStart = function() {

nc = new NetConnection();

nc.connect("rtmp://" + master_server + "/" + master_instance);

proxySO = SharedObject.get("myProxy",true,nc);

// Now, whenever the client asks for a persistent

// shared object called myProxy, it receives themyProxy

// shared object from master_server/master_instance.

};

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