Java Development

[anildeveloper]

i have an application with two possible main objects:

• UiApplication, for foreground process, we call it FG_UIApp
• Application for background process on auto-run-startup, we call it BG_App

For debugging I want to kill the BG_App by sending it a GlobalEvent from FG_UIApp. Ok, this works perfect. Now the BG_App doesn't run. It only runs again, when I do a full reboot. But now I would like to be able to start the BG_App again without reboot. I thought of a way like this:

1. user clicks the application 
2. now checking, if BG_App is running, when it doesn't run, just start it
3. for the user nothing happens, so he will again click the app
4. now checking, if BG_App is running -> it runs, so now we can start FG_UIApp

For this I implemented the following code. Step 1 + 2 are working, but when I do step 3 the debugger tells me, that my application is already running. Is there any way to simulate the autorun-entry-point without rebooting?

public static void main(String[] args) {
  boolean startbackground = false;
  if ( args.length > 0 && args[0].equals("autostart"))
    startbackground = true;
  else {
    boolean runtimestorevalues_are_existing = false;
    // checking some values in the runtime-store,
    // which are set by BG_App
    // if these values, don't exist, we start
    // the background-process
    if (!runtimestorevalues_are_existing) startbackground = true;
  }
  
  if (startbackground){
    new BG_App().enterEventDispatcher();
  }
  else {
    new FG_UiApp().enterEventDispatcher();
  }
}

 Regards, Anil

[MSohm]

Have a look at the link below.  You could get the ApplicationDescriptor for your alternate entry point and start it this way.

How To - Launch a third party application from another third party application
Article Number: DB-00455

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800620/How_To_...

[anildeveloper]

Hello Mark!

it still does not work. lets call my application "foo". I tried many different combinations with invoking foo by an application-descriptor following your provided example. It seems, that the provided example works for 3rd-party-applications to invoke ANOTHER  3rd-party-application. But it seems not to work for foo to invoke foo. In every combination I tried, every time when foo invokes foo, the debugger says:

Starting foo
Started foo(111)
JVM: bklt @9922: timer
JVM: bklt @9922: idle 3
JVM: bklt @9923: setTimer 19
Starting foo
foo already running

 Anil

[MSohm]

The behaviour you are seeing is expected.  Alternate entry points do not equal 2 copies of an application running at the same time.  Alternate entry points allow an application to take different actions based on how it was started. 

[anildeveloper · Accepted solution]

Hello Mark!

After playing with modifying ApplicationDescriptor it works. The solution is here:

/*
my cod-module is called foo
in my jde I have 2 projects
 - foo (the gui-application, called with no arguments)
 - fooautostart (the backgroundapp, called with the argument "autostart", 
    it is generally called, when the device is booting)
*/
public static void main(String[] args) {
if ( args.length > 0 && args[0].equals("autostart")){
  new BG_App().enterEventDispatcher();
}
else {
  RuntimeStore rts = RuntimeStore.getRuntimeStore();
  boolean runtimestorevalues_are_existing = false;
  /*
  now checking some values in the runtime-store,
  which are set by BG_App; if these values, don't exist,
  we have to invoke the background app in simulating the
  startup-entrypoint;
  */
  if (!runtimestorevalues_are_existing){
    try {
      int modHandle = CodeModuleManager.getModuleHandle("foo");
      ApplicationDescriptor[] apDes =
        CodeModuleManager.getApplicationDescriptors(modHandle);
      String[] args_for_descriptor = {"autostart"};
      ApplicationDescriptor descriptor =
        new ApplicationDescriptor (apDes[0], "fooautostart", args_for_descriptor);
      ApplicationManager.getApplicationManager().runApplication(descriptor);
      
    }
    catch (Exception e){
      System.out.println("background start exception ex: " + 
        e.toString() + ": " + e.getMessage();
    }
  }
  new FG_UiApp().enterEventDispatcher();
}
}

Thanks and best Regards to Canada.

Anil

Message Edited by anildeveloper on 09-08-2008 10:35 AM