From: "W.B.Hill" <mail@...>
Date: 2005-11-08T04:44:25+09:00
Subject: yajb usage queries...

Hi - I'm wanting to use yajb to script a fairly complex interface and I'm 
wondering if it's possible.

The interface is of the form:

$ cat iface.java

package org.wbh.testing;

import java.util.Vector;

public interface iface {
   public void     v();
   public int      i();
   public String   s();
   public String[] a();
   public Vector   V();
//  public void     p(int i);
}

$ cat aimpl.java

package org.wbh.testing;

import java.util.Vector;

public abstract class aimpl implements iface {
   public aimpl() {
     System.out.println("---> java constructor");
   }
   protected void finalize() {
     System.out.println("---> java finalizor");
   }
   public void jtest() {
     System.out.println("---> jtest() called");
     this.v();
     System.out.println("---> i() gave " + this.i());
     System.out.println("---> s() gave " + this.s());
     for(int i=0;i<this.a().length;i++) {
       System.out.println("---> a() gave " + i + " " + this.a()[i]);
     }
     System.out.println("---> V().firstElement()= 
"+this.V().firstElement());
//    this.p(31);
     System.out.println("---> jtest() finished");
   }
}

$ cat rtest.rb

require 'yajb/jbridge'

include JavaBridge

#JBRIDGE_OPTIONS={:jvm_log_level =>"debug",:bridge_log=>true}

jimport "java.util.Vector"
jimport "org.wbh.testing.*"

tclass=jextend(:aimpl)
class << tclass
   def rtest
       puts "---> rtest called"
   end
   def v
     puts "---> void method"
   end
   def i
     puts "---> int() method"
     return 42
   end
   def s
     puts "---> String() method"
     return "String??? Rope!!!"
   end
   def a
     puts "---> String[]() method"
     return [:t_string,"A001","A002"]
   end
   def V
     puts "---> V() method"
     vec=jnew(:Vector)
     vec.addElement(7)
     return vec
   end
#  def p(arg)
#    puts "---> Param given: " + arg
#  end
end

tclass.jtest
tclass.rtest
puts "---> That's all, folks!!!"


OK - How can I pass a value *from* java to the ruby implementation of the 
abstract class??? If the commented out code is activated it gives:
   jbridge.RemoteRuntimeException: class=TypeError  message=can't convert
   Fixnum into String

Also, this code seems to suffer from a race. *Sometimes* rtest is called 
before jtest has finished! Possibly related, one run can finish fine, but 
the next run gives:

Full thread dump Java HotSpot(TM) Client VM (1.4.2_09-b05 mixed mode):
"Thread-16" prio=1 tid=0x081c4520 nid=0x7cb8 waiting on condition 
[4d063000..4d0638b8]
         at java.lang.Thread.sleep(Native Method)
         at jbridge.BridgeServer$1.run(BridgeServer.java:248)
         at java.lang.Thread.run(Unknown Source)

How can I syncronize properly (I'm guessing this is an issue of the ruby 
end of the bridge quitting before the java's done, but I'd prefer not to 
have to do a wrapper on the java end of things.)

Any pointers? Thanks!
Bill

BTW, really like yajb for the integration, the way there's only jars and 
ruby, no JNI to mess around with!