Unexpected loop behaviour with asynchronous call
I am having trouble with loop behaviour when using an asynchronous call.
I am building an application to record simultaneously temperature (NI USB-TC01 thermocouple), displacement (DC voltage, read from an Agilent 34401a) and resistivity (using a Keithley 2400 sourcemeter).
I am using a voltage sweep function on the Keithley 2400 to alternate current direction in a sample and measure the voltage drop - this is a common technique for eliminating thermal emf from resistance measurements. But what you need to know is that I set the number of current cycles I want and then wait for the instrument to measure and return the meausurements - up to 50 samples, which takes nearly 30 seconds. With the other two measurements, I have to programmatically call a measurement vi for each sample I want.
I have set up my application to asynchronously program the resistivity measurement and then wait for the response, and I want to in parallel measure temperature and position until the resistivity is done. I then want to record the mean and standard deviation for each signal. I used an event structure to interrupt the temperature and position measurements when done.
The problem I am running into is that after the first resistivity measurement is completed and I go to do the second one, the loop that measures temperature and displacement only runs twice, so I only get two samples, regardless of how many resistivity samples I want to collect. For example, if I want 50 resistivity samples at a time, the first iteration will measure rougly 40 samples of temperature and displacement, but any subsequent iterations will only measure twice.
I know this is probably overwhelming to understand the operation, but can anyone help? I have attached my code ('Delatometer') as well as a test vi I built that uses the same structure but has no interactions with instruments ('asynchronousCall').
The
Attachments:
Delatometer.zip 221 KB
asynchronousCall.zip 29 KB
I forgot to mention...the test vi that I uploaded executes as expected, so I am thinking that maybe its an issue with the instrument calls? I also found that if I run the Delatometer program in 'highligh execution mode' it runs properly, and it is my understanding that in 'highlight execution mode' there is no multi-threading.
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Important data:
Development environment: VB6
OO4O: 10.2.0.2.20
Oracle Client: 10.2.0.1.0
Oracle Net: 10.2.0.1.0
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Bug in cursor behaviour with duplicates
Dear Oracle guys and girls,
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service
with the old system that takes around 10 minutes to complete. We obviously
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Which makes
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[email protected]Thank you very much. That is exactly what our engineers came up with
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need
for Jolt isn't supplied when you BUY JOLT, but only if you buy the
SUPER-EXPENSIVE
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Carl J. Collin
Walgreen Co.
[email protected]
"Manoj SASIDHARAN" <[email protected]> wrote in message
news:[email protected]...
>
Hello Carl J. Collin,
I can suggest a workaround to make things happen.
From the browser call a Tuxedo service (synchronously) using Jolt whichinternally
does the following:
SVC(TPSVINFO...)
SvcName="Name of Service Currently called from Browser..";
ret=tpacall(SvcName,... TPNOREPLY);
tpreturn(...);
HTH
regards
MS
"Carl J. Collin" <[email protected]> wrote:
We are currently using Jolt 1.2 connected to a Tuxedo 6.5 system on
Solaris.
We are porting a Windows thick application to browser. We call a Tuxedo
service
with the old system that takes around 10 minutes to complete. Weobviously
call this
asynchronously. When we call this same service using Jolt it"times-out".
Which makes
sense since Jolt 1.2 seems to only allow synchronous ( aka
Request-Response ) calls.
I have looked at the documentation for Jolt 1.2, 1.2.1, the Jolt with
Tuxedo
7.1 and Tuxedo 8 and
I cannot find an ability to make a Asynchronous call. However, I did
find
it in the API documentation
for the Jolt that comes with Weblogic Enterprise 5.1 and above? Are
these
APIs available without
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Walgreen Co.
[email protected] -
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Solved!
Go to Solution.Have you checked how long the first loop of the For loop takes, versus all of the others?
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Culverson.com
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Solved!
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CSY -
Problems with a call transaction
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Thanks in advanceHi,
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PERFORM bdc_dynpro USING 'SAPMF05A' '0300'.
PERFORM bdc_field USING 'BDC_OKCODE' '/00'.
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PERFORM bdc_dynpro USING 'SAPMF05A' '0300'.
PERFORM bdc_field USING 'RF05A-NEWBS' t_resumen-bschl.
PERFORM bdc_field USING 'RF05A-NEWKO' t_resumen-hkont.
PERFORM bdc_field USING 'BDC_OKCODE' '/00'.
j_hkont = t_resumen-hkont.
j_clave = t_resumen-bschl.
PERFORM bdc_dynpro USING 'SAPMF05A' '0300'.
PERFORM bdc_field USING 'BDC_OKCODE' '/00'.
j_wrbtr = t_resumen-wrbtr.
REPLACE '.' WITH ',' INTO j_wrbtr.
PERFORM bdc_field USING 'BSEG-WRBTR' j_wrbtr.
PERFORM bdc_dynpro USING 'SAPLKACB' '0002'.
PERFORM bdc_field USING 'BDC_OKCODE' '/00'.
ENDCASE.
READ TABLE t_porcentajes WITH KEY gjahr = t_resumen-zzbad
zzbtd = t_resumen-zzbtd.
IF j_hkont = t_porcentajes-cfacpr.
PERFORM bdc_field USING 'COBL-PRCTR' t_porcentajes-prctrfac.
PERFORM bdc_field USING 'COBL-ZZBTD' t_resumen-zzbtd.
PERFORM bdc_field USING 'COBL-ZZBAD' t_resumen-zzbad.
ELSEIF t_resumen-hkont = t_porcentajes-cadmin.
PERFORM bdc_field USING 'COBL-KOSTL' '20801'.
ELSEIF t_resumen-hkont = t_porcentajes-creca.
PERFORM bdc_field USING 'COBL-KOSTL' '20401'.
ELSE.
IF d_clave = 01 OR d_clave = 04 OR d_clave = 40 OR d_clave = 09.
IF j_hkont >= 424001 AND j_hkont <= 424005.
PERFORM bdc_field USING 'COBL-PRCTR' 'DUMMY'.
ELSEIF j_hkont >= 424601 AND j_hkont <= 424605.
IF j_clave = 40.
PERFORM bdc_field USING 'COBL-PRCTR' 'DUMMY'.
ENDIF.
ENDIF.
ELSEIF d_clave = 11 OR d_clave = 12 OR d_clave = 14 OR d_clave = 50.
IF j_hkont >= 424001 AND j_hkont <= 424005.
PERFORM bdc_field USING 'COBL-PRCTR' 'DUMMY'.
ELSEIF j_hkont >= 424601 AND j_hkont <= 424605.
IF j_clave = 50.
PERFORM bdc_field USING 'COBL-PRCTR' 'DUMMY'.
ENDIF.
ENDIF.
ENDIF.
*Fin modificacion marzo 2007.----
PERFORM bdc_field USING 'COBL-ZZBTD' t_resumen-zzbtd.
PERFORM bdc_field USING 'COBL-ZZBAD' t_resumen-zzbad.
PERFORM bdc_field USING 'COBL-ZZBTT' t_resumen-zzbtt.
PERFORM bdc_field USING 'COBL-ZZBTU' t_resumen-zzbtu.
PERFORM bdc_field USING 'COBL-ZZBTS' t_resumen-zzbts.
PERFORM bdc_field USING 'COBL-ZZBAG' t_resumen-zzbag.
PERFORM bdc_field USING 'COBL-ZZBRE' t_resumen-zzbre.
PERFORM bdc_field USING 'COBL-ZZBC8' t_resumen-zzbc8.
PERFORM bdc_field USING 'COBL-ZZBC9' t_resumen-zzbc9.
ENDIF.
ENDLOOP. -
Asynchronous call to web servie using pl/sql
1) How do I make an aynschronous call uisng pl/sql. I am currently using utl_http.
But it is expecting me to get repsonse using utl_http.get_response.
Is there anyway I can make asynchronous call to web service? Please give me examples if any.Web services are NOT asynchronous as the HTTP application protocol is not asynchronous. A web service cannot (as an sync callback event) initiate a call to the web browser (client app) - as the web browser does not have a tcp listening endpoint. The web service must respond using the EXISTING tcp session established via a connect() call from the browser.
PL/SQL code executes in a dedicated or shared server process. Execution is serialised. So asynchronous calls are not supported and non-existent. Again, async processing requires some from of notification (callback event, message handler or signal interrupt handler) to inform the main process (while it is executing code), that the async call has completed.
And this does not exist in PL/SQL processing for very good reasons. (Oracle would have been one of the most unstable products on the market if it did support async PL/SQL processing, as 99% of developers would not understand how to use it correctly, and would have severely violated the fundamental concurrency and MVCC principles)
What can be done via PL/SQL (and SQL) is parallel processing - not to be confused with async processing. The API in PL/SQL to use for that is DBMS_PARALLEL_EXECUTE. You can also self roll this using DBMS_JOB or DBMS_SCHEDULER.
No default IPC exists for inter process communication between parallel processes. If IPC is needed, it needs to be manually coded using a standard SQL table (where row locking provides for mutexes and semaphores), or something like DBMS_PIPE. -
Strange repaint behaviour with JList & Keyboard actions
Hi everyone,
This is my first post to the forum. You guys have been a great help in the past and I hope to contribute more in the future.
Anyways, I've encountered some strange repainting behaviour with a JDialog that uses a JList and a JButton. The dialog is fairly straight-forward and basically this is how it works (like an open file dialog - yes I'm implementing my own filechooser of sorts):
* JList lists a number of simple items that the user can select from.
* Once a selection is made, an Open button (JButton) is enabled.
* <ENTER> key is registered (using registerKeyboardAction()) with a JPanel which is used as the main content pane in the dialog.
* The user can either click on the Open Button or hit the <ENTER> key which then closes the dialog and runs whatever logic that needs to.
Now, the repaint problem comes in when:
1. User selects an item.
2. User hits the <ENTER> button
3. Dialog closes
4. User brings the dialog back up. This entails reloading the list by removing all elements from the list and adding new ones back in.
5. Now... if the user uses the mouse to select an item lower in the list than what was done in step #1, the selection is made, but the JList doesn't repaint to show that the new selection was made.
I didn't include a code sample because the dialog setup is totally straight-forward and I'm not doing anything trick (I've been doing this kind of thing for years now).
If I remove the key registration for the <ENTER> key from the dialog, this problem NEVER happens. Has anyone seen anything like this? It's a minor problem since my workaround is to use a ListSelectionListener which manually calls repaint() on the JList inside the valueChanged() method.
Just curious,
HuyOh, my bad. I'm actually using a JToggleButton and not a JButton, so the getRootPane().setDefaultButton() doesn't apply because it only takes JButton as an input param. I wonder why it wasn't implemented to take AbstractButton. hmmm.
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