RE: [ve-dev] Getting Parent's Proxy Host

[Rich Kulp <richkulp@xxxxxxxxxx>]

Hi,

You need to understand that when doing
expressions the actual execution occurs later when you do invokeExpression.
That is why you get ExpressionProxy's back. They are place-holders ("proxies")
to the real IBeanProxy. Everything you do with an IExpression is simply
pushing your requests on to a pipe that will be executed asynchronously
from your requests. Not until invokeExpression does everything sync back
up.

To use an ExpressionProxy in a call
to something on the remote vm, see BeanAWTUtilities.invoke_addComponent
as an example of how you push a method call onto an IExpression.

getBeanProxy() only returns fully instantiated
bean proxies. Until the invokeExpression we only have the placeholder,
the ExpressionProxy.

Rich

"Janak Mulani" <janak.mulani@xxxxxxxxx>
Sent by: ve-dev-bounces@xxxxxxxxxxx

10/21/2005 01:51 PM

Please respond to
Discussions people developing code for the Visual Editor project

To	"Discussions people developing code for the Visual Editor project" <ve-dev@xxxxxxxxxxx>
cc
Subject	RE: [ve-dev] Getting  Parent's Proxy Host

Hi Rich,
 
Thanks! Few more questions:
 
To instantiate BeanProxy for a
component I call in ULCComponentProxyAdapter (extends BeanProxyAdapter)
 
protected final IProxy primInstantiateDroppedPart(IExpression
_expression_) throws AllocationException {
  preInstantiateStuff(_expression_);
  IProxy newbean = primPrimInstantiateDroppedPart(_expression_);
  postInstantiateStuff(_expression_, newbean);
  return newbean;
 }
 
It returns an ExpressionProxy.
In postInstantiateStuff, I want to add this bean to the ULCDialog (our
free form) )in the VM:
 
For this, in VE 1.0, we were doing
the following:
 
 public static void addVisualComponentToFreeForm(IBeanProxyDomain
domain, IBeanProxy visualComponentProxy) {
        IMethodProxy methodProxy = getEnvironmentTypeProxy(domain).getMethodProxy("addToFreeForm",
                "com.ulcjava.base.application.ULCComponent");
        try {
            methodProxy.invoke(getEnvironmentTypeProxy(domain),
visualComponentProxy);
        } catch (ThrowableProxy e) {
            JavaVEPlugin.log("Unable
to add the visual component to the free form on target VM");
            JavaVEPlugin.log(e, Level.WARNING);
        }
    }
 
In the target VM we have a class
Environment which has a method addToFreeForm which inturn adds the component
to the ULCDailog.
 
Note we do not hold proxies to
the FF dialog in IDE at all. We just hold a proxy to this Environment class
which facades the dialog.
 
Now the questions:
 
1. primInstantiateDroppedPart
is returning ExpressionProxy. Our method addVisualComponentToFreeForm takes
IBeanProxy. How do I get this out of ExpressionProxy?
 
2. Is there a way I can find out
if primInstantiateDroppedPart actually insatiated a class on target VM?
I am not getting any exceptions, but getBeanProxy() is returning null?
Although newBean is not null! What should one look at in a variable type
ExpressionProxy to see that it is properly created? 
 
3. In our targetVMHelper class
to invoke methods on target VM, we use IBeanProxy, using which we get IMethodProxy
and the invoke methods on this.
Does this need to change? If so
how?
 
 
Thanks and regards,
 
Janak
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