First off, I''m a RoR beginner and am new to web dev in general, so
I''m
probably not going about this in the best way.
I''m trying to use thread.new to run an external application that has
the
potential to take a few minutes. The external app takes some info that
the user has selected on the web site and creates a file from it. What
I want to happen is that, when the user clicks a link, a window pops up
and the external app is started, but the .rhtml file is not loaded in
the popup until the external app is completed. Here''s my code:
on the list page, from where they will click the link to run the
external app:
<%= link_to ''External App'', :action =>
''extapp'', :popup =>
[''new_window'', ''height=300,width=600''] %>
in my controller:
def extapp
#create file
...
Thread.new {system("extapp.exe")}
end
in extapp.rhtml:
<%= link_to ''Download'', :action =>
''dl_output_file'' %>
So my problem is, extapp.rhtml is loaded immediately, giving the user a
link to download the file even though it hasn''t been created yet. If I
remove thread.new, extapp.rhtml doesn''t load until the app is done, but
then there is no threading and you can''t do anything else.
Any help would be greatly appreciated, thanks!
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zack wrote:> > First off, I''m a RoR beginner and am new to web dev in general, so I''m > probably not going about this in the best way. > > I''m trying to use thread.new to run an external application that has the > potential to take a few minutes. The external app takes some info that > the user has selected on the web site and creates a file from it. What > I want to happen is that, when the user clicks a link, a window pops up > and the external app is started, but the .rhtml file is not loaded in > the popup until the external app is completed. Here''s my code: > > on the list page, from where they will click the link to run the > external app: > > <%= link_to ''External App'', :action => ''extapp'', :popup => > [''new_window'', ''height=300,width=600''] %> > > > in my controller: > > def extapp > #create file > ... > > Thread.new {system("extapp.exe")} > end > > in extapp.rhtml: > <%= link_to ''Download'', :action => ''dl_output_file'' %> > > > > So my problem is, extapp.rhtml is loaded immediately, giving the user a > link to download the file even though it hasn''t been created yet. If I > remove thread.new, extapp.rhtml doesn''t load until the app is done, but > then there is no threading and you can''t do anything else. > > Any help would be greatly appreciated, thanks!You probably want to use Ajax: http://en.wikipedia.org/wiki/Ajax_(programming) Rails includes support for Ajax through the Prototype and script.aculo.us JavaScript libraries though you can use something else or roll your own if you like. -- Michael Wang --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
zack wrote:> in my controller: > > def extapp > #create file > ... > > Thread.new {system("extapp.exe")} > endThreading has a trick to it. The app can finish processing before the threads are finished. This bails out on the threads. You have to do a tricky thing that ensures all threads are done before processing continues. You can use Thread#join to do this. THis is a typical example for a some threaded operations. threads = [] threads << Thread.new { do_something(foo) } threads << Thread.new { do_something_else(bar) } threads.each do |thread| thread.join end or in your simplified example its even easier: Thread.new { system("extapp.exe") }.join Your code will not continu past the join method call unless the thread join is called on is completed. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---