Making a GUI take precedence over other threads.
Hi,
Basically what I'm trying to do is display a message on screen after a user has clicked a button that starts a thread which conducts a Bluetooth device search. This message needs to say "please wait" or "discovery in progress" or something and will disappear once the Bluetooth thread has finished executing.
Currently the way I am trying to achieve this is creating a thread which constructs and displays a JFrame with a progress bar in it, when the "discover devices" button is clicked. Also in the action listener for this button, the Bluetooth device discovery thread is started.
The problem I'm having is that when the button is clicked a grey box appears (the "please wait" message) however, it is empty until the Bluetooth thread has finished executing, at which time the progress bar and labels are filled in.
What am I doing wrong? How can I get the "please wait" form to be displayed fully before the Bluetooth discovery thread starts?
By the way if anyone can suggest an entirely different way of displaying this message, please do.
Many thanks.
You need to create a separate Thread for your long running task so it doesn't block the GUI Thread.
Maybe the link from the Swing tutorial on [url http://java.sun.com/docs/books/tutorial/uiswing/components/progress.html]How to Use Progress Bars will help.
You can also read this article on [url http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html]Using Threads.
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What the advantages of having an BAPI over Other data migrations
What the advantages of having an BAPI over Other data migrations
Th advantages of BAPI
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You can also refer to below links:
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Basic learning guide:
http://searchsap.techtarget.com/originalContent/0,289142,sid21_gci948835,00.html
BAPI intro:
http://www.sappoint.com/abap/bapiintro.pdf
Overview:
http://www.planetsap.com/Bapi_main_page.htm
Also have a look at the following link :
http://www.planetsap.com/LIST_ALL_BAPIs.htm
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BAPI_CUSTOMER_CREATEFROMDATA
BAPI_CUSTOMER_CREATEFROMDATA1
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ie it can be invoked from remote programs like standalone JAVA programs, web interface etc..
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BAPIs that can create, change or delete instances of a business object type
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Change( )
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Check these Links out
http://searchsap.techtarget.com/ateQuestionNResponse/0,289625,sid21_cid558752_tax293481,00.html
http://www.sap-img.com/abap/interview-question-on-bapi-rfc-abap-objects-tables.htm
http://www.sap-img.com/fu033.htm
http://www.sap-img.com/abap/ale-bapi.htm
Please check out this thread..
Re: bapi
Also refer to the following links..
www.sappoint.com/abap/bapiintro.pdf
www.sap-img.com/bapi.htm
www.sap-img.com/abap/bapi-conventions.htm
www.planetsap.com/Bapi_main_page.htm
www.sapgenie.com/abap/bapi/index.htm
Checkout !!
http://searchsap.techtarget.com/originalContent/0,289142,sid21_gci948835,00.html
http://techrepublic.com.com/5100-6329-1051160.html#
http://www.sap-img.com/bapi.htm
http://www.sap-img.com/abap/bapi-conventions.htm
http://www.sappoint.com/abap/bapiintro.pdf
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BAPI's as i said earlier are remotely enabled function modules..
Hence, JCO can call also BAPI's(n not only BAPI's as u mentioned).
Check the following BDC over BAPI
The steps to be followed are :
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[for VA01 use BAPI_SALESORDER_CREATEFROMDAT2]
2. Create a Z program and call the BAPi (same as a Funtion module call).
2. Now, if you see this BAPi, it has
-> Importing structures.
eg: SALESDOCUMENT: this will take the Sales order header data as input.
-> Tables parameters:
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Note :
Only specify fields that should be changed
Select these fields by entering an X in the checkboxes
Enter a U in the UPDATEFLAG field
Always specify key fields when changing the data, including in the checkboxes
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Maintain quantities and dates in the schedule line data
Possible UPDATEFLAGS:
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D = delete
I = add
Example
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Notes
1. Minimum entry:
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You must always enter key fields for changes.
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Hi all,
I use JOptionPane.showConfirmDialog(...) in my actionPerformed method in my class. After clicking the Yes button, a long non GUI operation takes place. Until the long non GUI operation completes its execution, the place where the showConfirmDialog was there is filled by gray background until the non GUI operation completes its execution.
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"Chris Danek" <[email protected]> wrote:
>
Good reading definitely, but it hasn't seemed to help
me. Have you
found a solution to your problem? I'm almost to the point
of just
letting "guest" always return true for that particular
function....
cd
"Don Dwoske" <[email protected]> wrote:
it seems we are having the same problem. look at the
discussion
tom and I are having.
If you figure out a nice solution, let me know what you
did.
Does your code always go into an infinite recursion?
Mine does
not, which is confusing the hell out of me, it seemsto
happen
at random.
-Don
"Chris Danek" <[email protected]> wrote:
I've got a custom realm which is doing a JNDI lookupas
part of
the getUser() function call, leading to infinitely looping
recursive
calls to getUser (since weblogic is checking my custom
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How to load 5.6 into ML.
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http://support.apple.com/kb/DL1482
Click to open the dmg but do not attempt to install the pkg.. it won't work anyway.
Leave the package open on the desktop so you can see the file. AirportUtility56.pkg
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http://www.timdoug.com/unpkg/
Run unpkg on the desktop.. If your Mac refuses to run the software, because it wasn’t downloaded from the Apple store, go to security in preferences and allow other software to work.. this is limitation of trade methinks. You can set back later if you like.
Now drag the AirPortUtility56.pkg file over to unpkg.. and it will create a new directory of the same name on the desktop.. in finder, open the new directory, drill down.. applications, utilities .. there lo and behold is Airport utility 5.6 .. drag it to your main utilities directory or just run it from current location.
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Primitive data changes visible to other threads?
I thought that if one thread changes an instance variable, the change may not be visible to other threads if synchronization is not used.
Today I read that primitive types whose assignment is atomic are an exception. Is that correct?
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The assignment of most types are atomic. They either contain a value or not. This does not nessecarly mean that they are written to the main memory, they could still be in the thread-local memory area. Once they are being transfered, the transferation will also be atomic. Example of non-atomic is that longs and doubles are assigned the first 32 bits and then the rest of the 32 bits. This would for instance if two threads wrote to the shared memory, you could end up with the first 32 bits belonging to the change made in thread 1 and the last 32 bits belonging to thread 2.
So, for a method that is not declared synchronous but assigns one single value before returning is "thread" safe in the aspect that one thread will manipulate the data on at the time. This does not however guarantee order. So, thread 1 can enter the method but not do the assignment, thread 2 enters the method, does the assignment that is imidiatly written over by thread 1. Synchronous would make sure that thread 2 could not enter until thread one written it's change.
There is a reserved keyword 'volatile' in java that has the purpose of warning JVM's that a variable is not allowed to be stored in thread-local memory space, but as far as I know, no JVM implements this functionality properly.
What the article states is that if you only do one assignment or return it will be executed atomically as long as we are not using long or double. It is a bit braver than I would say, since technically an reference assignment can be atomically assigned before the object is actually created (se articles from Doug Lea about the failure of double-checked locking ) and therefor some thread problem could occur as it might use an object before it is actually there.
Regards,
Peter Norell -
[svn] 4648: If text and content are both set on TextGraphic or TextView, content takes precedence.
Revision: 4648
Author: [email protected]
Date: 2009-01-23 14:33:27 -0800 (Fri, 23 Jan 2009)
Log Message:
If text and content are both set on TextGraphic or TextView, content takes precedence. Content can then be set to null to allow text to take precedence.
If there is no text in TextGraphic or TextView should still be able to enter text. Set contentChanged when original empty textFlow is created to make sure a flowComposer is allocated in updateDisplayList().
QE Notes:
Doc Notes:
Bugs: SDK-17307, SDK-16893
Reviewers: will be Gordan
Ticket Links:
http://bugs.adobe.com/jira/browse/SDK-17307
http://bugs.adobe.com/jira/browse/SDK-16893
Modified Paths:
flex/sdk/trunk/frameworks/projects/flex4/src/mx/components/TextView.as
flex/sdk/trunk/frameworks/projects/flex4/src/mx/graphics/TextGraphic.asHello!
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