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Subject DO NOT REPLY [Bug 52706] New: Make Execute class extensible to allow custom CommandLauncher implementation
Date Sun, 19 Feb 2012 11:01:12 GMT

             Bug #: 52706
           Summary: Make Execute class extensible to allow custom
                    CommandLauncher implementation
           Product: Ant
           Version: 1.8.2
          Platform: PC
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Core
    Classification: Unclassified

Created attachment 28353
A patch to implement the enhancement

Right now Execute uses a static CommandLauncher instance which is
initialize inside the static initializer ("class constructor").
CommandLauncher's responsibility is to create the Process instances.

Currently there isn't a way to make Execute use a different CommandLauncher

I have attached a patch containing the changes I made to Execute java class. 
What I have basically done is move the code that initializes the
CommandLauncher from the Execute class to to the CommandLauncher class. I have
made CommandLauncher class public and all the subclasses of it public too.  I
have added two static methods 
getVMLauncher and getShellLauncher to the CommandLauncher class. These methods
take a Project object as parameter and check if a reference to an existing
CommandLauncher is present in the project. If present then that instance is
returned. Otherwise the method checks if a system property containing the name
of the launcher class has been set. If so then an instance of that class is
created and returned, otherwise the default launcher is returned. I have also
added setVMLauncher and setShellLauncher methods that add reference to a given
CommandLauncher instance to the project. 

I have modified the Execute class to use these two methods to get the reference
of the CommandLauncher class. I have also created a CommandLauncherTask class
similar to the PropertyHelperTask that takes an instance of any CommandLauncher
class and adds a reference to it to the project.

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