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1 "correct" answer available (4 pts) 2 "helpful" answers available (2 pts)

Synchronous Method Call

Created on: Jun 20, 2009 4:57 AM

Created by: Jayanta Datta

Hi All,

The scenario:

I have a GUI Component XML called 'testPage.xml'
It calls a method called init() onAfterDeserialize
init() method calls method1 and method2
method1 executes a rule, i.r. receives an xml on service call ans sets the xml doc in cache
Requirement: - method2 should be executed only after full execution of method 1, i.e. a synchronous method call because method 2 reads the xml from cache which was set by Method 1
Note: If I put an alert in between calling of 2 methods, I am successfully able to execute the methods with proper data, i.e. by the time the user clicks OK in the alert, the data is populated in the cache, but when I remove the alert, the methods are called asynchronously which returns a null in method 2 when it tries to read the data from cache.

Please guide me how do I achieve synchronous method call. I tried to look into the APIs onAfterAssemble(), onBeforeAssemble(). But I am not aware as how to use the APIs.

I am using TIBCO GI 3.6.1

Thanks in advance

Regards

Jayant

fred

42 posts since
May 25, 2009

1. Jun 20, 2009 6:01 AM

in response to: Jayanta Datta

Re: Synchronous Method Call

whoa!!!!

just use window.settimeout() for the 2nd method.

by this it will invoke the 2nd method after the specified delay.

hope it'll work.

Jayanta Datta

17 posts since
Oct 24, 2008

2. Jun 20, 2009 6:25 AM

in response to: fred

Re: Synchronous Method Call

Thanks Fred for your reply.

I am sure it will work, but what if the service sends a delayed response or the xml is too huge to load into the cache. How can we guess the time duration the 1st method will take to actually load the huge XML in cache.

Please guide if we have something like method 2 is triggered only after method 1 is executed fully.

Thank you,

Regards,

Jayant

fred

42 posts since
May 25, 2009

3. Jun 20, 2009 11:55 AM

in response to: Jayanta Datta

Re: Synchronous Method Call

oh, this seems to be a interesting case.

Well in ur case write the 2nd method just after the onsuccess of the service.

Darren Hwang

1,397 posts since
Aug 6, 2008

4. Jun 22, 2009 10:50 PM

in response to: Jayanta Datta

Re: Synchronous Method Call

Yes, why not simply add your method2 call within the onSuccess() callback of your method1?

method1.doCall()

onSuccess() { method2.doCall() }

A network request does not have to be synchronous to be sequential.

Jayanta Datta

17 posts since
Oct 24, 2008

5. Jun 22, 2009 11:42 PM

in response to: Darren Hwang

Re: Synchronous Method Call

Thanks Darren and Fred,

Actually method1 is written on success of doCall which sets the xml document into cache and method2 should read from cache. Is there any API so that we can catch an event on setting the xml doc in the cache, i.e. if the setting the cache is success or failure etc

Thank you again,

Regards,

Jayanta

fred

42 posts since
May 25, 2009

6. Jun 24, 2009 11:11 AM

in response to: Jayanta Datta

Re: Synchronous Method Call

try to catch the cache change event , then subscribe ur method to this event.

don't forget to mark it as a answer if it solves ur purpose.

Jayanta Datta

17 posts since
Oct 24, 2008

7. Jul 1, 2009 6:17 AM

in response to: fred

Re: Synchronous Method Call

Hi Fred,

Thanks for the solution. I tried to subscribe the event. Now I am able to synchronize the method call and on alert, i am able to see the cache content. But I am actually creating a CDF out of that xml which then paints the matrices. On subscribing this to cache event, the paint fails, though it creates the CDFs in cache, sets the XML ID to the matrices in the backend, but doesnt gets reflected in the UI.

This I am able to achieve from the same method when I donot subscribe the cache event, instead I put an alert in vetween call of 2 methods.

Thank you

Regards

Jayant

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