Help on invokelater and invokeandwait

Hello,
i am developing an application using swing API.
in this application i have to read ceratin data from the database. and do operation on the data.
what i want to do is to fetch data based on a query and display the data to the user in a JTable on a separate JFrame. the user selects the row from the table, he wants to process and presses the select button on this frame, to set the static variable (say ROW_ID) in the class whcih invoked this frame.
now what should happen is that the invoking class object should wait untill i press the select button (ie when the ROW_ID is set).
i would like to know how to do it.
please help
thank you
Message was edited by:
vaibhavpingle

now what should happen is that the invoking class object should wait untill i press the select button (ie when the ROW_ID is set).
It doesn't sound like you want invokeLater() or invokeAndWait().
I think you want one of two things: the more likely is that you want to be using a modal JDialog to allow the user to select a row (if you display the table, make the selection and then close that new window). The other possibility is that you want your original object to have state, which is modified (on the Event Dispatch Thread) when the user makes the row selection. Until that state is modified, certain functionality is disabled.
i also tried to use the invokeAndWait(runnable) method but i got an exception saying that the call cannot be made
What exception? I don't know of one which says "the call cannot be made."

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InvokeLater() and invokeAndWait(): concerns over synchronization

I've been reading up on the methods invokeLater(Runnable) and invokeAndWait(Runnable) and I've understood this much: the difference is in the synchronization of the new thread with the main (or current) one. I somewhat familiar with what synchronization means (i.e. it's a way of guaranteeing that changes made to shared resources are seen by all threads as soon as they are made).
My question is: does a call to invokeAndWait() mean that I don't have to worry about synchronizing methods and code?

gib65 wrote:
My question is: does a call to invokeAndWait() mean that I don't have to worry about synchronizing methods and code?No. Both the invoke methods just push off code to be executed in the event thread. That might mean that you don't need synchronization, but only if the synchronization was needed because you had the event thread and another thread accessing same resources.
The difference is that invokeLater doesn't stop the execution of the current thread, while invokeAndWait stops the current thread until the task has been run on the event thread.

InvokeLater() and invokeAndWait()

I'm somewhat confused about when to use these.
from http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html - it says "you must take extreme care that Swing components and models are created, modified, and queried only from the event-dispatching thread"
I also understand that these two methods are basically the same though invokeAndWait only returns once the run() has completed while invokeLater will return immediately.
So, when should I use these? and which one should I use?
If I'm creating the GUI initially, use the invokeAndWait()
If I'm updating/quering the GUI components, use invokeLater()
is this the correct way of thinking?

You only need to use these methods if you are updating your GUI from a Thread you have spawned. These methods insure the GUI udpate is performed from the event dispatcher thread as those methods put the GUI update in the event queue.
If you are already updating the GUI from the event dispatcher thread (i.e. from an ActionListener, MouseListener, etc) you don't need to use them.
For instance lets say you do an expensive database query (takes a noticeable amount of time to return results) when you press a button. If you just do the database query in the main thread the rest of your application will block while the db query is performed. So you would spawn a new thread with your db query in it. However, now lets say when the db query is over you want to update some status label to notify the user. You would put the label update in a Runnable object and pass that to invokeLater() which would put your runnable oject in the event queue which would eventually get executed by the event dispatcher thread.
Now the rest of your application is responsive while the db query is occuring. And the label will be updated in a thread safe way when the db query is done.
Generally invokeLater() is used, as invokeAndWait() blocks until the runnable object you add to the event queue is executed. This isn't generally desireable. More or less you can safely ignore invokeAndWait(), although keep it in mind for those rare occasions where its usage would be desireable.
Here a very generic example:
public void actionPerformed(ActionEvent e) {
      //Button has been pressed lets query the db in a thread
      new Thread() {
            public void run() {
                //Hit the DB
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                    public void run() {
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        }.start();
}

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Help with writing and retrieving data from a table field with type "LCHR"

Hi Experts,
I need help with writing and reading data from a database table field which has a type of "LCHR". I have given an example of the original code but don't know what to change it to in order to fix it and still read in the original data that's stored in the LCHR field.
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C
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Hi Anuj,
The unicode flag is active.
When I run our report and then to try and save the list data a dump is happening at the following point
LOOP AT T_TAB into L_WA.
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APPEND T_DATA-RAWDATA to T_TAB.
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Using Search Help with ALV and Dynamic context node

The topic subject already describes my situation.
I have to create, populate and remove context nodes at runtime, and bind them to an ALV, to let user display the data or modify the data. The nodes I create are always typed with a table name, but the table name is of course, dynamic.
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I have checked with method GET_ATTRIBUTE_VALUEHELP_TYPE of interface IF_WD_CONTEXT_NODE_INFO, on an attribute which i know to have a search help (Foreign key of a check table).
The method returns 'N', that is the constant IF_WD_VALUE_HELP_HANDLER~CO_VH_TYPE_NO_HELP. So, the framework was not able to find a suitable search help.
Using method GET_ATTRIBUTE_VALUE_HELP of the same interface, on the same attribute, returns me '111', which is constant C_VALUE_HELP_MODE-AUTOMATIC.
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Help getting worse and worse

When CS5 went out, i spend a lot of time here trying to undertand what happened to the online help.
I even stopped adding comment and being part of the community help because metric driven design is,
as far as the help layout is concerned, a very very bad idea.
My hopes were limited for CS5.5 and I really wanted Adobe to correct this in CS6...
I wonder what happened with the online help part of Adobe apps in general, and AE specifically.
I wanted to check some stuff on it, and it’s a complete disaster (at least in french).
All the links in the "what’s new in cs6" are pointing to Todd’s blog home page, not even to the related post, and it even links to it when the topic is not disscussed at all on the blog. Hopefully, they all comes with another link to the home page of video brain, not even to the correct course or anything.
I’ll be more specific; For a tutorial I’m recording, I wanted to check some info on the new material properties, because I’m not a 3D guy and wanted to use the correct french words and be sure not to mess-up.
So I went to the online help home page, got in the what’s new in cs6 page, then scrolled down to new material option where it linked me to Todd’s blog and video brain. Both on the home page. Because I didn’t care about watching a video, and needed to read some stuff in french to get the correct words, I went to the Layer & properties part of the help.
What a joy, 6 of the 7 topics wheren’t updated since january 1st (meaning no info about new stuff in CS6) and the only part updated is about 3D layers, yay ! So let’s open that page.
I got 8 topics, none with info about the materials, old or new, only basics info about rotating,moving, 2d/3d layers, intersecting... and, on this "Product affected: Adobe After Effects CS6" page, info about Photoshop 3D layers, a feature removed from the product.
That’s when I used that handy "search box", because that’s what I was told when I complained about how lame was the CS5 docs navigation compared to the CS4 one: the paradigm shifted from topic related discovery to keyword search related discovery.
Let’s try to find out some info for the "Options Surface" category.
it takes me to the community help results: http://community.adobe.com/help/search.html?searchterm=optionsurface&q=optionsurface&lbl=aftereffects_product_adobelr&x=0&y=0&area=0&lr=en_US&hl=en_US
The first AE related link is 7th on the list despite a search in AE related docs... And on the 4 AE related links, nothing to do with what I need. Yes, I know, I searched the french name, but shouldn’t I get community results in french , or at least, official documention results in french ?
If I select the "only adobe content" radio button, it’s worse. Less AE links, less relevant.
If I click "support" instead of Community help, it’s not better, still more links pointing to Illustrator or Photoshop than After Effects. At least, 1 link is related to 3D layers in raytraced environment, but not what I’m looking for.
Oh yes, now there's a topic browsing page. Let's have a try with that. Guess what ? Couldn’t find the info I was looking for.
Removing the breadcrumb navigation in CS5 help was an ugly move, but this new help system is just... I don’t know how to say it politely. I haven’t been satisfied with the help system since CS5, when you removed the very usefull, always on context and organised bredcrumb navigation on the left hand side of the screen. I wished you stoped the "search" paradigm and went back to the "organised" one. I know your metrics shows people love searching. But how many search does they have to go through before getting the correct result ? How many unsuccessfull search before they don't bother anymore ? Honestly I’ve never seen such a messy help, and it really is confusing. It even feels like Adobe doesn’t bother about it anymore, and that it’s now relying only on external content, giving the feeling that the only thing up-to-date are the links to videobrain/creativecow/whatever rather than the official content itself. Hopefully, the curators for these links only points to very good tutorials.
The other thing that is bothering me, is that we get more and more video content instead of text content. Don’t get me wrong, I love watching videos. But I also love to read the docs. It’s much more effective that trying to seek in the video for that special piece of info you are looking for (and there no way to know if the info you’re looking for is indeed in the video or not, or to "search" it's content).
And don't get me started on the Help App, I never understood why you did it in the first place. Not as inconvenient as the website, but nearly.
Not having an efficiant documentation is bad. I’ve been asking for an help redesign since CS5, complained in a blog post and on the community help forums. With this new non-sensical online help, where nothing is to be found easily, this will soon become mendatory. If Adobe doesn’t care for help anymore, they should remove it completly instead of making it less and less relevant, and more and more messy. If you have an email address where I can send this rant I’d be glad to let the right people know.
Seb

Thx for the reply Terri,
i'll probably send you a mail with more thoughts, but what I feel from your answer is that you didn't get the major issue I have with the online doc since CS5.
Sure it's nice to know that you'll fix your broken search engine and that you'll add some filters back (reference only). But the major issue here is your paradigm shift from indexed content to searched only content. Nothing can be found easily. Absolutely nothing. Either in localised versions or in the english version. The layout is nerve breaking, and the search results are really bad (but this is what you are going to fix someday soon).
For an online help to be efficient we need properly organised and Indexed content first, and then a powerfull search engine to find it if we don't know where to look. Right now, you've wipped out the index & organisation and just piled stuff here and there leaving us the only way you think we want to browse the help: search. And that's the problem. We are not able to browse the help anymore; We can only search it, and we even cannot rely on that.
Sincerly, go browse the CS4 online help. it was clear, and working like a breath with the always handy, and always displayed breadcrumb navigation. It also featured search. Now, go back to CS6, and tell me where is the improvment. No way to properly separate official docs, from adobe official blog posts, from 3rd party sites/blogs. Everything is mixed-up and unbrowsable. Even some of the "topic pages" makes no sens, as I demoed in my previous post. No way to keep on context. No way to explore more without returning back to the search results. Having more great content from 3rd party is really interesting, but it's poor integration with the official docs makes it an experience breaker.
When I'm in my app and need help, I need to first and foremost go to the official help, I need it clearly organised and with an understandable and clean layout. And when I'm on my topic and feel I need more info/ in depth knowledge, a link to 3rd party tutorials, free or paying. And it's not the experience I'm getting. And it's the experience I need. I don't understand how it became so messy, but honestly, I've never seen something like that.
Also, you've increased focus on video content. Yeah watching tutorial is cool. But video is not searchable. Video is not immediate. When I need help, I need to read the answer first to fix my issue, and then, if I feel I need to learn more, go to AdobeTV, Videocopilot, Videobrain & such to learn more stuff. Your enphasis on 3rd party and video content have shrank the volume of quickly available info. We need more text content, and more text content from within the official documentation, not from partners. Because once again, each time i'm redirected to a partner site, I loose context...
So please, stop focusing on search only, and bring back the much stronger breadcrumb navigation, bring back in front the official documentation, so the info precise, findable, and not dilluted.

When I went to bed I had 3,000 song and multiple playlists. This morning I have ~30 songs and no playlists. What could have happened to my songs playlists? I run iTunes on a Windows 7 64-bit machine. HELP! (oh, and the Songs are not in recycle bin)

When I went to bed I had 3,000 song and multiple playlists. This morning I have ~30 songs and no playlists. What could have happened to my songs playlists? I run iTunes on a Windows 7 64-bit machine. HELP! (oh, and the Songs are not in recycle bin)
My wife's ipod nano was plugged into the machine overnight.
When she went running with it, there were no songs on it. She checked the computer and was horrified to see that the playlists had disappeared and most of the songs had disappeared.
QUESTIONS:
1. What could it be?
2. How can I fix it?

Hi, there alot of us suffering from this phernomonon but there is a forum topic about is already.
https://discussions.apple.com/message/16767377#16767377
Come check it out.
Hope this works out for all of us.

Help on invokelater and invokeandwait

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