How java is going to achieve asynchronous calls
How java is going to achieve asynchronous calls
(Ex. calls from a web service)
Is it doing by using threads or some other technique to do this???
I do not know whether there is any published API to do asynchronous invokations. If you write one you will have to use the threads to implement it.
Similar Messages
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How to move files in background (asynchronous call)?
Hello
I would like to make an an Asynchronous call to the Move.vi for moving files as a background process.
I am having the following problems:
- The static VI Reference as input to the Open VI Reference function asks for a path to the VI to be called, but I can't find it. Where exactly is Move.vi located?
- The Type Specifier VI Refnum node accepts VIs via drag and drop, but only from an explorer window, not from the LabView VI palette. Again, I need to know where to find Move.vi. Or is there another way to specify the connector pattern?
It all works, if I call Move.vi from within a wrapper VI (because I know where to find that), but for the sake of simplicity I would like to avoid that step.
I'd appreciate any suggestions, also alternative approaches for moving files in the background.
SebastianMove is not a VI, but a primitive, so you can't call it like that. As you've seen, the wrapper method works.
Try to take over the world! -
I need to deploy an executable to a customer's computer and for the first time I have the need to use an asynchronous call in my program I am not sure how i am going to keep the file path to the "Open VI Reference" valid after I build and deploy the application. The Obvious manner would be to use a configuration file to allow me to set the path independently of the LabVIEW Application. However, when you include A VI in the "Always include" it is not An EXE thus not include as a file in the build folder, making it had to reference on the host computer.
Some educational tips on how to do this would be very help full for learning how to deploy this application
Attached is a code snippet of how i am currently stating an asynchronous call
Thanks
Mark R.
Actually, what you're referring to is a "type specifier VI Refnum", which is only used for type, but doesn't have any other information about the VI really. I've run in to bugs before where I changed the connector pane on a VI, but the type-only references I had in my code didn't update because there's no link to the VI, just the pane...
So really there are three different forms of a VI reference. Normal, Strict, and Type-only. Strict encapsulates both the normal reference and the type-only reference. -
How to handle Asynchronous calls using OSB?
Hi There,
How to handle Asynchronous calls using OSB?
Please help me out??
-VenkatHello friend, here is what you need.
Oracle Service Bus, invoke asynchronous webservices | Oracle .. Java .. OpenSource .. SOA -
How can we tell if a VI is already running before calling Start Asynchronous Call?
The new Start Asynchronous Call node is awesome for spawning multiple instances of reentrant VIs. However, I've stumbled a bit in using it for non-reentrant VIs. The old practice of using the "Run VI" method would allow us to check the Execution.State of the VI before invoking the method to run it. That way if the State was Running or Run Top Level, we could skip the invoke node and just use a property node to open its front panel. WIth the Start Asynchronous Call node, it looks like we have to use a strictly typed static VI reference, and when we open the VI reference, the VI gets reserved and its Execution.State = Running. So, how can I tell if it is not just reserved by the thread but actually executing before making a redundant Start call?
By the way, the redundant Start has interesting behavior. It will actually cause the targeted VI to be executed again after it stops. Even if you hit the Abort button on the target VI, it will immediately execute again and again equal to the number of times the Start Asynchronous Call node was run. There's nothing wrong with that, and I suppose the simple answer is to just go back to using the old "Run VI" method. It's just that the ability to wire up those inputs directly to the connector pane is so nice. Perhaps I am missing something obvious. Oh, I am referring to the Call and Forget mode (0x80).
Thanks,
Dan
Solved!
Go to Solution.Just throwing it out there, I know I'm a year.5 late on this but if it's a psuedo-modal dialog or some other window that you only want a single instance visible at one time, you can check the FP.State property on the strictly typed vi reference. If it's loaded and visible to the user it will be "Standard", if it was closed or not opened prior then the state will be "Closed".
I think the standard behavior of serializing execution on another thread would be great for doing a pre-set number of iterations with a sub vi in a non-blocking sort of way but for sub vi's meant for UI interaction checking FP.State works.
Philip
CLD -
OSB is staless and how it achieves Asychnorous call back
Hi All,
I got to know OSB is statless and BPEL is stateful and hence it supports Asynchronous Call back reliably with Correletaion ID which is also
supported in Oracle Enterprise Service bus and it is now knows as Mediator in 11g.
The question I have is
A) Since OSB is stateless which means we can't implement Asynchronous call back kind of integration pattern.
B) If my proxy service has to call WebService Asynchronopusly and don't wait for the response continue with the rest of the
execution once the response get's received from the web service it has to send the details to the source.
I am indeed aware of one particular indirect approach is this kind of stuffs could be achieved in JMS queues by means of correlation IDs by
means of using two queues one for request and another for response.
If anyone had a better suggestion/thoughts please do provide the same at the earliest.
Many Thanks,
DiniYou may also consider the approach discussed here -
http://blogs.oracle.com/knutvatsendvik/entry/oracle_service_bus_asynchronous_message_processing
http://biemond.blogspot.in/2011/02/building-asynchronous-web-service-with_27.html
Regards,
Anuj
Edited by: Anuj Dwivedi on Feb 10, 2012 6:01 PM -
How to access contact list while a call is going o...
Can anybody how to access contact list while a call is going on or call is on hold in Nokia E5 moblile?
Hit the menu key, to switch to the application menu, and open the Contacts app; the E5 supports multitasking just fine.
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Most of my iPhone data is going into this section called "other", but I don't know what that means or how to fix it. Does anybody know?
This is asked and answered often.
The forum search abr is on the right side of this page.
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How choose between post and get when calling a servlet from a java class ??
Hi !!
I have an urgent question : in fact some java programs that call servlets are published on the web, and the principle is to make an url.openconnection() to reach the servlet.
What I don't understand is how we choose if we want to call the get or the post method on the servlet ?????
please answer very fast.....
thanks...from the URL documentation of openConnection():
"If for the URL's protocol (such as HTTP or JAR), there exists a public, specialized URLConnection subclass belonging to one of the following packages or one of their subpackages: java.lang, java.io, java.util, java.net, the connection returned will be of that subclass. For example, for HTTP an HttpURLConnection will be returned, and for JAR a JarURLConnection will be returned."
Obviously, in case of a http servlet, normally an instance of HttpURLConnection will be returned. If you don't change the request method, GET is the default. -
In a .java file.We can fold up them in a package.
for example,in my test.java file:
package tax;
In other .class,I will call the test.class.
I can use import ="tax.*"
but how java achieve the search?
I make a directory tax in d:\.Could java find it?
after I javac test.java to test.class in the d:\tax,
I move the test.class to d:\test\test\tax direcory,
Could it continue ok?
Any suggestion would be appreciated!
In your example, if the tax directory exists in d:\ and contains the
test.class file, you need to set the CLASSPATH environment variable to
include d:\ so that it can find the class. You could also specify the
classpath on the java command line using "-classpath d:\"
tornado wrote:
> In a .java file.We can fold up them in a package.
> for example,in my test.java file:
> package tax;
> ...
>
> In other .class,I will call the test.class.
> I can use import ="tax.*"
> but how java achieve the search?
>
> I make a directory tax in d:\.Could java find it?
> after I javac test.java to test.class in the d:\tax,
> I move the test.class to d:\test\test\tax direcory,
> Could it continue ok?
>
> Any suggestion would be appreciated!
-
Wait on Asynchronous Call - why so long?
LV 2013, Win7
I have a window which comes and goes, during program operation.
This window has 72 subPanels, each containing a reentrant copy of the same VI for a "block". I insert the VI in the subpanel, and then run the VI with a CALL and FORGET call.
When the user closes the window, all the block VIs terminate, and the window closes. I don't care if the closing behind the scenes still goes on after the window disappears.
But when the user QUITs the program, with this window up, I need to make sure that all the block VIs have terminated before I shut down other things (close files, etc).
To that end, I changed the CALL and FORGET to a CALL and COLLECT operation, and installed a WAIT ON ASYNCHRONOUS CALL for each instance at the end of the big window code. This is after the blocks have been commanded to die (via an event).
I see from the debugging file (a portion is pictured) that it takes over 1000 mSec to wait for all the instances to die.
The thing is, if I change that "0" to "1000", then what I would expect is that the actual waiting time would drop to < 100 mSec.
My thinking is that during that timed wait, the blocks would be dying anyway, so it would take less time to actually wait on them.
But when I do that, nothing really changes. The listed time is still over 1000 mSec.
If I limit the number of blocks to 12, the time is 97 mSec, for 24 it is 185, for 36 it is 576, and so on - it's proportional to the number of blocks.
So, what is really happening? If it's just waiting on things to die, why doesn't the timed wait affect the numbers?
I originally (when I used CALL and FORGET) kept track of how many were opened and how many were closed and waited until that became zero, but this is a cleaner way of doing it, at least in theory.
Am I missing something?
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks
Solved!
Go to Solution.Have you checked how long the first loop of the For loop takes, versus all of the others?
So I tried that, several times - the pattern is the same as shown here. The first few lines are from the blocks themselves, it's the last thing they do.
Looks like there's ONE case where there's a bigger delay than expected, All told, this takes about 600 mSec.
Maybe the debugging process affects that (* waves to Mr. Heisenberg * )
The 300-400 mSec is back to where I first saw this delay. Apparently the unreleased refs clog up the system enough to drive it up to 1000 (or 2000 mSec as I saw in one case).
Still, I don't understand why a timed delay ahead of the WAITS doesn't affect the WAIT time.
But I guess that's not important. It must be actually doing more work than simply asking "is it dead yet?"
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks -
I am locked out of my Iphone. It says to log into my itunes to unlock. I log into my itunes and it says to put my password into my phone but I can't it just goes to the emergency call, How do I unlock my phone?
Place the iPhone into Recovery mode. If successful, this will require restoring the iPhone with iTunes which is required anyway in this situation.
http://support.apple.com/kb/HT1808 -
Anyone know how java can get html code
I have this great idea for a program but I need to know how java can get some source code off a web page (HTML) so i can then get certain information from it.
Then with that certain information on my side can I then like post data through a from like a cgi/php script through a post variable?
Have any of you heard of something like this?you can read the html easy enough, look in the docs for, of all things, objects that have html in their name.
if you are going to post back then you need an interface to post to--like a servlet--but in any case it has to be supported by the site you want to post back. -
Is there a way to process multiple asynchronous calls individually (instead of all at once)?
Hello,
I have a function that saves a record using a RPC call (asyncToken with a new responder). When I save an individual record (pressing "s" key), it works fine. However, when I attempt to save multiple records simultaneously (bound to "v" key) (I have a for loop running through the selectedItems in the datagrid), it performs strangely.
For anyone who hasn't experienced this, the successive calls seem to get stacked (literally - i.e. using a stack) and processed at the end of all operations in that block of code (I had trace functions before and after the call that were executed before I saw the result confirming this).
What I would like to do is to simulate multiple AsyncToken usages with a single click, but still have them all occur individually since right now, the function saves the last item in the stack 8 times instead of saving each of the 8 items separately.
OR
Is there another means of RPC using something like "interruptToken" as opposed to asyncToken? (In most other areas I've seen, asynchronous calls are performed as interrupts and dealt with immediately, thats why this procedure confused me for a bit)
Thanks in advance,The second paragraph you posted is definitely worthwhile - still figuring out some of the inner workings of Flex calls (not just RPC stuff) that I use as I am pretty new to flex.
I don't have the code with me at the moment, but I think I have to use separate calls to the save function. My situation is this (and I plan on updating with code on Monday if necessary):
I have a datagrid that is populated using a single RPC (which is loaded into an arrayCollection first then the datagrid). Changes are made to the datagrid through a copy/paste function that I made, but these changes are only reflected on the datagrid (i.e. not in the dataprovider). When the user hits "save", the selected line (selectedItem actually - i.e. not an index but the object itself) is passed to another class which contains a modified version of my "modify data" function (brings up a dialog after choosing a given line allowing editting/validation of certain fields regarding the selectedItem). This changed version of "modify data" is then called and immediately closed effectively saving this record (without allowing the user to alter fields - so they don't have to hit save twice).
With the copy/paste function, I make all of these changes en masse and then have a loop that goes something like
for each (_object:Object in myDatagrid.selectedItems)
callSaveFunction(this, _object);
which ideally loops through the data and saves each item that has been changed. If there is a way to save all of the data in the datagrid simultaneously, I would appreciate a bit of help there (perhaps dealing with the bindings - right now I have the object I save as the destination and the source is myDatagrid.selectedIndex.[field name]).
Good to know about the other stuff, though - my understanding was a little bit lacking before -
Notify an application user that an asynchronous call of a bi publisher report has been completed
Hi experts,
We have an ADF application (11g) from where we call BI Publisher (11g) reports by using bi publisher web services.
I have the following 2 requirements:
Run the reports asynchronously
Notify each user that the report which has been asynchronously called has been completed.
My thought was to use the scheduleReport web service which is asynchronous by default.
My problem is how to notify only the specific user using "http notification" that the report is ready.
http://docs.oracle.com/cd/E28280_01/bi.1111/e22259/reporttriggers.htm#BIPDV008
Can you please help me on this?
Regards,
DimitrisI've converted the Blob to a Clob but still can't get it to appear in the BI Report. It shows up in the XML file as a bunch of text character, but in the report if I use the fo: instructions it remains blank, and if I don't, it shows the same text data that is in the XML file.
Perhaps BI Reports aren't meant to show database images? Is there another tool I can use instead (data is in APEX 4.0) 11g.?
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