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Is it possible to store global variables only in current context? #2257

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AlBundy33 opened this issue Dec 1, 2014 · 1 comment
Closed

Is it possible to store global variables only in current context? #2257

AlBundy33 opened this issue Dec 1, 2014 · 1 comment
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Non-Release

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@AlBundy33
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In the example below the second execution uses global variables from the first one.
Is it possible to store global variables in the scriptcontext instead in the default-context of the engine?

We are executing a lot of scripts in our application an need to ensure that they have a "clean" context.
Our corrent workaround is to reset global variables after script-execution but this has the side-effect that variables will be gone if another script-execution is triggered inside the script.

this works:

  • call script
  • do something
  • reset global variables
    --> next execution will have a clean context.

this doesn't work:

  • call script
  • do something that triggers another script
  • "another script is executed"
  • "another script" clears global variables
  • return to main script - global variables are gone. :-(

For example we put a variable $tool into each context to access some helper-functions.
In the second example $tool is nil in the main-script after the "sub-script" is done.

Our expected behavior would be that each script-exection has it's only context including the global variables - so each script would have it's one instance of tool without affecting eachother.

    System.setProperty(
        PropertyName.LOCALCONTEXT_SCOPE.toString(), 
        LocalContextScope.THREADSAFE.toString().toLowerCase());
    System.setProperty(
        PropertyName.LOCALVARIABLE_BEHAVIOR.toString(), 
        LocalVariableBehavior.GLOBAL.toString().toLowerCase());

    final ScriptEngine _e = new JRubyEngineFactory().getScriptEngine();

    final StringWriter _s = new StringWriter();
    final PrintWriter _p = new PrintWriter(_s);

    _p.println("p $foo");
    _p.println("p $msg");
    _p.println("$foo = 'bar'");
    _p.println("p $foo");

    final SimpleBindings _ctx = new SimpleBindings();
    final Map<String, Object> _params = new HashMap<String, Object>();
    _params.put("msg", "Hello World");
    if (_params != null)
      for (Entry<String, Object> _pe : _params.entrySet())
        _ctx.put(_pe.getKey(), _pe.getValue());

    // first p shows nil
    _e.eval(_s.toString(), _ctx);

    final SimpleBindings _ctx2 = new SimpleBindings();
    if (_params != null)
      for (Entry<String, Object> _pe : _params.entrySet())
        _ctx2.put(_pe.getKey(), _pe.getValue());

    // first p shows bar instead of nil
    _e.eval(_s.toString(), _ctx2);
@kares kares added this to the Non-Release milestone Jun 23, 2017
@kares
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kares commented Jun 23, 2017

probably resolved by now, but for the record: sounds like you wanted to have multiple engines started.
probably the meaningful work-around would have been to use ScriptingContainer directly instead.
other possible 'solution', if you really want a single runtime would be to execute against an engine from multiple threads and set scope to CONCURRENT.

@kares kares closed this as completed Jun 23, 2017
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@kares @AlBundy33