EventListeners for multiple remote object calls

Hi all,
I have a Flex component that is displaying content from multiple (specifically two) remote object calls. I can call both remote methods, get the results back, pass them off to their respective ItemRenderers, etc. with no trouble. What I need, though, is a way to determine if I get no results back from either function call, to dispatch an event to trigger the next view state, and I don't know how to do that. Something like:
protected function ticketConfigurationStateChangeHandler(event:Event):void
               if(getPackagePromptsResult.lastResult.length == 0 && getTicketPromptsResult.lastResult.length == 0)
                     this.dispatchEvent(new Event("ticketConfigurationStateChange"));
            protected function ticketPrompts_creationCompleteHandler(event:FlexEvent):void
                getTicketPromptsResult.token = registrationAPI.getTicketPrompts();
                getTicketPromptsResult.addEventListener(ResultEvent.RESULT, showTicketConfiguration);
            protected function packagePrompts_creationCompleteHandler(event:FlexEvent):void
                getPackagePromptsResult.token = registrationAPI.getPackageCPrompts();
                getPackagePromptsResult.addEventListener(ResultEvent.RESULT, showPackageConfiguration);
Any suggestions would be greatly appreciated...I know I need the event listeners to be able to get lastResult.length (and have it not be null) but I don't know how to set them up so I can automatically pass the user through the component and onto the next one if there are no results returned without having the user click a button or something similar on an otherwise blank component.
Thanks in advance!
~ Amanda

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Running one rmiregistry for multiple remote object servers

Hi,
I don't find any clear answer for this situation. I want that multiple objet servers (running in separated JVMs) share one rmiregistry placed on a dedicated server. Servers stays in a same network (no firewall at all). If this feature is covered, could you give me any example or link that describe the source code ?
Thanks very well for yours answers.
Manuel

Thanks again for your help, and sorry for my weak usage of english language.
I've tried to bind some remote objects from distinct 'physical' hosts (or computers) to a dedicated registry located on another host.
To resume: I want to use one unique registry for multiple remote objects hosts.
EJP you have posted : But they must all be running on the same host as the Registry.
After reading again the official rmi tutorial, I found :
For security reasons, an application can only bind, unbind, or rebind remote object references with a registry running on the same host. This restriction prevents a remote client from removing or overwriting any of the entries in a server's registry. A lookup, however, can be requested from any host, local or remote.
This confirm that I wanted to do was not possible.
To override this limitation, do you think it's possible to write a remote object located on the registry host, that propose a method used from other hosts to register their remote objects ? Something like that:
// Interface
public interface recordFromHost extends Remote {
    int recordObject(String name, Remote obj) throws RemoteException;
// Implementation of interface
public class recordFromHostImpl extends UnicastRemoteObject implements recordFromHost {
    public recordFromHostImpl () throws RemoteException {
        super();
    public int recordObject(String name, Remote obj) {
       int ret=0;
        try {
            Registry registry = LocateRegistry.getRegistry();
            registry.bind(name, obj);
        } catch (Exception e) {
            System.err.println("recordObject exception:");
            e.printStackTrace();
            ret = -1;
    return ret;
// Server code on registry host
public class Serveur {
public static void main(String args[]) {
        // Security manager
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(new SecurityManager());
        // Start of registry
        try{
            LocateRegistry.createRegistry(1099);
        }catch(RemoteException e){
            System.exit(1);
        try {
            String name = "recordFromHost";
            recordFromHost myObj = new recordFromHostImpl ();
            Registry registry = LocateRegistry.getRegistry();
            registry.bind(name, myObj);
        } catch (Exception e) {
            System.err.println("bind exception:");
            e.printStackTrace();
// Code used from a server host to register his remote object in the distant registry
Registry registry = LocateRegistry.getRegistry(registry host adress);
recordFromHost myRecord = (recordFromHost) registry.lookup("recordFromHost");
Create local remote object to register (remoteObject : interface, remoteObjectImpl : implementation)
remoteObject myRemoteObject = new remoteObjectImpl();
// register myRemoteObject
myRecord.recordObject("myRemoteObject", myRemoteObject );
...Finally, a client who want to use myRemoteObject ask the registry for this object, and use it without limitation : the remote object host will not be the registry host.
I hope that you understand what I mean :-)
Manuel

When submit remote object call getting error Client.Error.DeliveryInDoubt

Hello,
We are having very weird error DeliveryInDoubt from blazeds.
[ERROR] failed to call the remote service !!![FaultEvent fault=[RPC Fault faultString="Channel disconnected" faultCode="Client.Error.DeliveryInDoubt" faultDetail="Channel disconnected before an acknowledgement was received"] messageId="98F7B030-0FE0-0B88-300C-EC422D055E21" type="fault" bubbles=false cancelable=true eventPhase=2
Error does not happen every time, but rather from time to time but happens on all client machines.
Environment:
blazeds v3.
Flex application with Remote Object.
Browser IE7.
Object that passed to blazeds is complex and might have 100 items.But number of items does not seem affect error occurences.
Short description for the object passed to blazeds remote object call for processing:
Remote Object call takes an argument ArrayCollection of SyncRequest objects (_requestSyncList)
                var syncRequest:SyncRequest = new SyncRequest();
                var syncObject:Object = new Object();
                syncObject[requestBuilder.direction] = requestBuilder.jobMap;
                syncRequest.syncJobs = syncObject;
                _requestSyncList.addItem(syncRequest);
requestBuilder.jobMap is an object that have different artifacts.
jobMap[obj.artifact] = myColl;
myColl is ArrayCollection of artifact of SyncJob
Here is the definition of SyncJob
   public class SyncJob
        public var jobName:String;
        [ArrayElementType("com.farmers.docprocessing.remotesync.vo.JobParameter")]
        public var jobParams:ArrayCollection;
Not sure what causing that issue and how to debug it.
Please advice.
Thank you

Not without you psoting some code.
Possible problem: Difference between object type being returned, vs the type of the reference (i.e., the method that returns an object should have a return type of the interface name).

Two remote objects calls on the same php class

Hi to all,
I've encountered a strange issue while developing with remote objects.
I've a mxml component with an init() method inside which is called by a menu.
When the init() method is called it makes 7 remote object calls which are bound to some components' dataprovider.
Among this calls I've got 2 remote object which refer to the same remote class. This because I have to call the class twice and the bind the result to two different combobox. Below you find the code:
<mx:RemoteObject id="myFile" source="myRemoteClass" destination="amfphp" showBusyCursor="true" makeObjectsBindable="true" fault="traceFault(event)"/>
<mx:RemoteObject id="myXls" source="myRemoteClass" destination="amfphp" showBusyCursor="true" makeObjectsBindable="true" fault="traceFault(event)"/>
in the init function I make this calls:
myFile.listDir("dir_1")
myXls.listDir("dir_2")
then in the mxml code I bound the result of myFile to combobox1 and the result of myXls on combobox2.
The problem arise when I call the myXls' listDir method. When I call it I receive the following error:
code:
Client.Error.DeliveryInDoubt
Message:
Channel disconnected
Detail:
Channel disconnected before an acknowledgement was received
The strange thing is that not only the myXls object returns this error, but also all the other 6 remote object return the same error above.
I'm not sure, but I guess that the error could be caused by the two remote object which call the same php remote class. If I comment one of the two calls everything works fine.
Do you have any suggestion about?
Thanks!!
Bye
Luke

Hi Jan.
1) We have the 2 VO, each with 3 rows to fill in data. What I mean is that when i just fill in all the fields for the first row of the first VO, and the value of one of these fields is bigger than 50, then after the exception is thrown and the message is displayed, the fields for the first VO are duplicated and shown in the second VO as if the user had inserted them.
2) We tried yesterday the validateEntity and a Method and Atributte Validator approaches after reading that white paper with the same results.
The validation is correctly done using any of the those methods.
I will try to reproduce this issue with the HR schema.
Thanks in advance once again.

Weblogic 10.3.0 issues with remote object calls.

All:
I was wondering if anyone has experienced any issues with Weblogic 10.3.0 dropping initial remote object calls over AMF Secure Channel. Here are the issues we are experiencing.
1. FLEX applications fail consistently on the first remote object call made across the AMF Secure Channel. Resulting in the request not returning from the application server; which has had varying affects on the different applications including missing data, application freeze and general degrading of the user experience.
2. FLEX applications require a browser/application refresh once the application has been inactive for a certain period of time. In our experiences the behavior occurs after 30 minutes of inactivity.
I've deployed this same code to Weblogic 10.3.3 and the behaviors go away. Are there any patches to 10.3.0 that might take care of this issue that we are not aware of?
Thanks for you help,
Mike

Hello,
I found the problem. But I needed change the target of all my datasources until discover that one of my datasource didn´t answer and no errors was trigged.
My server was waiting this datasource, and not get started.

Completely different AMF request packets for same remote service call from Flex to PHP using ZendAMF

I was trying to debug why one of the remote-services in our Flex application was failing randomly. What I found was interesting. Completely different AMF request packets were sent for same remote service call from Flex to PHP.
When the service call succeeds the AMF request packet looks like the following:
POST /video/flex/bin-debug/gateway.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Firefox/3.6.15
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Cookie: PHPSESSID=j6u30i8uu6c3cvp8f4kipcpf05
Referer: http://localhost/video/flex/bin-debug/main.swf/[[DYNAMIC]]/5
Content-type: application/x-amf
C    ontent-length: 305
Flex Message (flex.messaging.messages.RemotingMessage)     operation = getMemberFromEvent    clientId = 2F997CD0-7D08-8D09-1A9B-0000422676C8    destination = MembereventService    messageId = B46AB58D-2241-83F0-41E4-9FE745565492    timestamp = 0    timeToLive = 0    body =     [      280    ]    hdr(DSId) = nil
And when the service fails the AMF request packet looks like this:
ServiceRequest: getMemberFromEvent; RemoteService; getMemberFromEvent
(mx.messaging.messages::RemotingMessage)#0
body = (Array)#1
    [0] 250
clientId = "1AA4FAAB-AEA5-8109-4B0D-000002B3A9A1"
destination = "MembereventService"
headers = (Object)#2
    DSEndpoint = (null)
    DSId = "nil"
messageId = "2F92E6C0-FE92-A09B-B150-9FE2F28D9738"
operation = "getMemberFromEvent"
source = "MembereventService"
timestamp = 0
timeToLive = 0
Also, following is the error message on Flex when the service fails:
{Fault code=Channel.Call.Failed, Fault string=error, Fault detail=NetConnection.Call.Failed: HTTP: Failed, Destination=MembereventService}
We are using Swiz as the micro-architecture for Flex development and Zend AMF for remoting between Flex and PHP.
Any ideas what is wrong here, what is causing Flex to send different request packets for the same service & what I can do to fix it?

Hi, I know that your post is almost 5 years ago, but have you found the solution to this issue?
Thanks.

Create confirmation for multiple cost objects PO in SUS

Hi,
Is it possible to create confirmation for multiple cost objects PO ( order type 'MA') in SUS ?
We are going to implement SRM 7.
Thanks & regards,
Afandi-

Hi All,
First of all, thanks for your responses..
Right, about the issue, what I explained here was that I am indeed assigning only one cost object: the WBS element. The issue was that even though I am assigning only the WBS element, it was also assigning the cost to the cost center by default. I did some R&D and found the solution to the issue (I was also asked to look for OSS notes but was not satisfied that this issue needs an OSS note to be applied so tried my solution). The issue was in table: T788M (allocate costs to variable account assignment). Here, I created an entry and called it USERGROUP_2 (just a random name) and assigned the variable cost objects (only the WBS and the Cost center) to be displayed. In the next step, I assigned this usergroup to the country in quesion feature (TRVCO). By doing this, I tell the system that only these cost objects are to be considered when an employee wants to assign the cost object. If the system sees that there is no value from the drop down to choose from, it picks up the default cost object (cost center). This was a simple issue that I had to rattle my brains on... but the solution I mention above worked like a hot knife going through butter...
If you guys face this issue, please try this else feel free to get in touch with me on my number below.
Once again, thanks for your responses.
Best regards,
Tanmay Dhingra
+91 880 6666 606

Simultaneous remote object calls in one http request?

I am noticing when I have two remote object calls happen at the same time they are being bundled into one http request. This is causing problems in my application becuase the result is not coming back until both have finished.
So basically I have to calls that happen at the sametime. One does not take anytime and the other is a long running task. I will not get the result for the first until the long running task completes.
Has anyone else seen this?
Any help would be appreciated.

"suspend the main thread, pending a remote call.." No. Can't
be done.
..."pass arguments into the resultHandler..." Yes, this is
done using the AsyncToken. (ACT pattern)
The send() methods returns an AsyncToken object. You can use
this dynamic object to add almost anything you want to the token,
including strings, and functions (google the term "closure").
As I am still not comfortable with anonymous functions, I
like to pass strings. I pass an identifier, which I can use in a
switch statement to determine the next step. Sometimes I pass a
"nextStep" string to define finer grain conditionality.
I use a single dataService object and result handler function
for all calls.
Tracy

Start and stop windows service for multiple remote computers

Hello,
Can someone show me how to Start and Stop windows service for multiple remote computers using Command Prompt or PowerShell or even Java?
Thank you

You asked a pure Windows related question at a pure Java related forum. We have advised you to look for a Windows related forum to post the question. Nothing special. It's like asking a car mechanican to help you with your migraine, he would advise you to look for a general practitioner.
But why are you so surprised and negative about this answer after all? Don't we have to help you? Don't you appreciate help? So be it then, but please stay away then if you keep this attitude.

Daisy-chaining remote object calls

If you want to get data from a series of CFCs using remote
object, and each call depends on data received from the previous
call, you have to daisy-chain the functions making the calls,
otherwise there is no way to guarantee that the data is available
in time (in practice it is never available in time) because the
main thread races on regardless.
Now if you want to refresh parts of the data, or you want to
get a different set of data from one or more of the same CFCs, you
either can use the same functions and set up a different set of
daisy-chains with multiple boolean tests to see which chain of
links should be being followed ( and this ends up something akin to
a four-dimensional Hampton Court maze), or you have to duplicate
the remote calls over and over again in different sets of functions
and resultHandlers. Either way you end up with a horrible mess.
Is there any way to write a class that can suspend the main
thread, pending a remote call listener sending a resume main thread
event.
The other way that would work (though this would not be as
good) is to change addEventListener, so that you can pass arguments
into the resultHandler.
Does anyone have any ideas that could lead to a solution to
this problem? It's giving me gray hair.
Doug

"suspend the main thread, pending a remote call.." No. Can't
be done.
..."pass arguments into the resultHandler..." Yes, this is
done using the AsyncToken. (ACT pattern)
The send() methods returns an AsyncToken object. You can use
this dynamic object to add almost anything you want to the token,
including strings, and functions (google the term "closure").
As I am still not comfortable with anonymous functions, I
like to pass strings. I pass an identifier, which I can use in a
switch statement to determine the next step. Sometimes I pass a
"nextStep" string to define finer grain conditionality.
I use a single dataService object and result handler function
for all calls.
Tracy

Best Practices for many Remote Objects?

Large Object Model doing JDBC over RMI
Please read the following and provide suggestions for a recommended approach or literature that covers this area well?
N-Tiered Architecture
JSP/Servlet (MVC) - Database Access Layer - Database
Applets - JSp/Servlet Engine - Database Access Layer - Database
Application Layer - Application Layer - Database Access Layer - Database
I have an object model developed using Torque (A JDBC Object Relational modeling framework) for over 100 tables (to be over 160) that I am commencing to enable over RMI. I have got several remote methods up and running. For some of the simple methods starting up has been easy. Going forward I forsee issues.
Each table has a wrapper or data object and a peer object that have setters/getters and special methods as desired. The majority of these classes are extended from Base Objects that have basic common functionality for retrieving, creating, and manipulating with a database using SQL.
I have started building a Remote Interface and an Implementation class that invoke the necessary methods and classes within the Object Model to pull successfully off or update the database. Additionally the methods will need to return objects that represent non-primitive serializable dataobjects and collections of objects.
Going forward client applications, servlets, and jsps will be using the database in more complex and comprehensive methods over rmi. Here are a couple of things I am concerned about.
1) When to use java.rmi.server.codebase for class loading? In my implementation several of the remote methods will return objects (e.g Party, Country, CountryList, AccountList). These objects themselves are composed of other objects that are not part of the jvm. For all remote methods that return non-primitive objects must you include the classes in the codebase for the client to operate upon them. Couldn't this be pointless as you have abstract and extended classes all residing within the codebase? In practice do people generally build very thin proxy objects for the peer/data objects to hold just the basic table elements and sets?
2) Server Versioning/Identity - Going forward more server classes will be enabled via rmi. Everytime one wants to include more methods on interface that is available must you update the interface, create new implementation classes, and redistribute the Remote Interface, and stubs/skels to client apps to operate on again? Is there some sort of list lookup that a client can do to say which processes are available remotely presently (not just at initialization)? As time changes more or fewer methods might be available?
Any help is greatly appreciated.

More on Why other approaches would be better?
I have implemented some proxy objects for the remote Data Objects produced by Torque. To ease the pain, I have also constructed a proxy Builder that takes the table schema and builds a Proxy Object, an inteface for the proxy, and methods to copy between the Torque Data Object (which only lives on the server) into the Proxy Object (accessible by client and/or server).
The generated methods are useable in the object implementing the Remote Interface but are themselves not remoteable. Only the Server would use these methods. Clients can only receive primitives, proxy Objects, or collections of ProxyObjects.
This seems to be fairly light currently. I had to jump hoops to use Torque and enable remote apps to use the proxy objects. What would be the scaling issues that will come up? Why would EJBs with containers and all kinds of things about such as CMP vs BMP to be concerned with be a better approach?
Methods can be updated to do several operations verses Torque and return appropriately (transactions). In this implementation the client (Servlet, mini App or App) needs the remote stub and the proxy objects (100 or so) to stand in for the Torque generated Data Objects. A much smaller and lighter set of classes, based on common JDK classes, instead of the torque classes (and necessary abstracts/objects/interfaces/exceptions for Torque).

Single content repository for multiple archiving objects?

We have three archiving objects that the business has basically set the same retention period for all of them (April 1: archive previous year (current-1), delete archived data from the year before (current-2)). Rather than have three separate repositories, would it be a good practice to place these three (and any other that meet the criteria) into the same repository making the management of these simpler (deleting from IXOS)?
Thank you,
Skip howell
Limited Brands

Hi,
COntent repository can be single or multiple. It depends on the clients requirements.
How ever you can recommend to your client based on the following best practices :\
(1) COntent repositories can be created and allocated based on the archive object.This will help the client to maintain the archive files and also use them at a later stage for retrieval/audit or any other purpose.
(2) Content repositories can also be created and allocated based on the retention time .
(3) Single content rep for multiple objects is technically possible but this is not a good approach.If this is done, then utmost care needs to be taken during the Archive file naming convention ( while archiving the data for a particular object) . Such a naming convention would reduce the hassels of getting the archived files mixing up. this will also help you to better manage the archive files of different objects in a single content rep.
DIfferent clients may use any of the approact based on their records management strategy.
Hope this information helps.

The Best Tool For Multiple Animated Objects

Hi,
I am expirimenting with Flash Web Sites, and I would like suggestions as to a starting point for my project, and I am assuming a Flash website is where I would start.
Basically, If I were to open up a web page, I would like to see multiple animated objects. For example, if I were to simulate an Emergency Room, I would have an EKG displaying a heart rate, then perhaps see a breathing maching apparatus moving up and down, a Drip bag (sorry, don't know the real term), dripping into a patient's tube. And of course, if I were to roll over an object it would animate, and if clicked on more animation or on to another page.
I tried creating the animated objects in Fireworks, and I thought I could combine various Firworks files into one, but it didn't work (too many frames), either becasue I lack the knowlege of how to do this or simply it cannot be done that way in Fireworks. I had a background with one animated flashing object (that was easy), but combining multiple independent objects, I could not figure it out.
Someone suggested that I would have to use Action Scripts, which made me realize, I don't know the best way to accomplish my example above, and although I know I may be over my head, I would just like to get direction as to where I should begin.
Should it all be in Flash in the first place? To continue on with the example above, after a user clicks on the rollover image, a girney comes rolling in and we are giving choices on a monitor with what our next actions should be, which would take us into another page. (this is just to give you perpective of what I am trying to accomplish).
Should I create independent animated objects (files) in Fireworks, then somehow import them into their specified location in Flash.
I hope this makes sense and I am hoping someone is kind enough to provide a starting point.
Best.

Flash is the best tool for what you want and most of it can be done once you get a handle on the basics.
For you interactivity (rollOvers / triggering more animations with mouse) you will need some actionscript but don't get hung up on that now.
There is a world of info out there. Google "animation basics in flash) you may have to weed through some garbage but you will find what you are looking for somewhere.

RMI for multiple remote interfaces

We have a few classes that extend multiple remote interfaces. The stub and
skeleton created by the weblogic rmi compiler have strange names like
WLSkel3f2i4g44322n5l3i1r224p60697473f.class and
WLStub3f2i4g44322n5l3i1r224p60697473f.class.
Is this ok? How can we make it create "normal" class names?
Thanks,
Inbal

try using the -nomanglednames option on the weblogic.rmic compiler.
I think what you've got is OK - it's a result of the clever stubs weblogic
generates for rmi.
It's documented in the "Using weblogic RMI" guide.
-Dominic
Inbal Ronen wrote:
We have a few classes that extend multiple remote interfaces. The stub and
skeleton created by the weblogic rmi compiler have strange names like
WLSkel3f2i4g44322n5l3i1r224p60697473f.class and
WLStub3f2i4g44322n5l3i1r224p60697473f.class.
Is this ok? How can we make it create "normal" class names?
Thanks,
Inbal

Concurrent / Parallel remote object calls from same browser app

Hello Everyone,
I was wondering how remote requests made to blazeds get served by application servers, when it comes to serving multiple (parallel) remote requests coming from the same application in the same browser.
Let us say that once you land on an application, you can fire-off 10 independent remote calls.
Will they all be served by the same request thread in the application server one after another?
I suspect this because the browser will really only maintain one duplex tcp/ip channel with the blazeds and therefore multiple requests should really just race to the server and get served one after another sequentially based on whichever gets their first.
This is just what I suspect but I would like to find out from experts on the forum.
Thanks,
- Pulkit

"suspend the main thread, pending a remote call.." No. Can't
be done.
..."pass arguments into the resultHandler..." Yes, this is
done using the AsyncToken. (ACT pattern)
The send() methods returns an AsyncToken object. You can use
this dynamic object to add almost anything you want to the token,
including strings, and functions (google the term "closure").
As I am still not comfortable with anonymous functions, I
like to pass strings. I pass an identifier, which I can use in a
switch statement to determine the next step. Sometimes I pass a
"nextStep" string to define finer grain conditionality.
I use a single dataService object and result handler function
for all calls.
Tracy

EventListeners for multiple remote object calls

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