php-java-bridge-users Mailing List for PHP/Java Bridge

Hi Jost

Thank you very much for your explanations

On 7/24/06, php...@li...
<php...@li...> wrote:
> Hi Paul,
>
> > to keep certain Java objects (in my
> > case Lucene index searchers, query filters)
> > persistent between client calls.
>
> I usually use a factory class:
>
> public class FooFactory {
>   private static final Object foo=createFoo();
>   public Object getFoo() {
>      return foo;
>   }
> }
>
> This works because the JVM keeps the class Name=>Class
> bindings in a weak hash map and classes usually aren't
> gc'ed unless the VM runs short of memory.

That could be part of the solution, like a lucene indexreader for a
dedicated application. But in my case, I want to build an easy to
distribute/deploy PHP component requiring only the minimim work of
installing your php-java bridge as a stand-alone service (or for those
who can within tomcat or the likes).

> The above method can't be used if all nodes of a
> (weblogoc- or tomcat-) cluster should refer to the
> same foo instance or if there's no persistent VM at
> all(for example if lucene and the bridge classes have
> been compiled to native code and are started for each
> request).
>

That is not the case for me, I did not explore the option of compiling
to native code yet (but will do, curious about the performance with
respect to a VM install)

> > I also suspect
> > serializing (sometimes
> > larger) objects is beyond the scope of session
> > variable too.
>
> Depends on how long you want to keep the data and how
> expensive it is to create. If the data is really
> expensive I would use the JPersistenceAdapter,
> serialize the data and store it on the master node, on
> the web server or in a database and deserialize it
> when the next request comes in.

Ah, that's interesting! The data (lucene filters and sort objects
mainly) is rather expensive to create (roughly 50 to 200 msec per
instance for a "typical" index which has a few tens to a few hundred
fields and 100k records)

The main problem with JPersistenceAdapter is that I should find a way
to get this working in a PHP4 contextto which I'm tied now ... and
which does not look trivial now

Thank you very much again, I learned a lot andn admire your work on
the php-java bridge!

Best regards

Paul

-- 
http://walhalla.wordpress.com

Hi,


> i wanna return jl;
> 
> but it show me "object(Java)#2 (0) { } "

In PHP4 the code

$ob = new Java(...)
echo $ob;

prints the above, 

echo $ob->toString();

should display the string representation of $ob, if
$ob has a toString() method.


Regards,
Jost Boekemeier





	

	
		
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Hi Paul,

> to keep certain Java objects (in my
> case Lucene index searchers, query filters)
> persistent between client calls.

I usually use a factory class:

public class FooFactory {
  private static final Object foo=createFoo();
  public Object getFoo() {
     return foo;
  }
}

This works because the JVM keeps the class Name=>Class
bindings in a weak hash map and classes usually aren't
gc'ed unless the VM runs short of memory.

The above method can't be used if all nodes of a
(weblogoc- or tomcat-) cluster should refer to the
same foo instance or if there's no persistent VM at
all(for example if lucene and the bridge classes have
been compiled to native code and are started for each
request).


> I also suspect
> serializing (sometimes
> larger) objects is beyond the scope of session
> variable too.

Depends on how long you want to keep the data and how
expensive it is to create. If the data is really
expensive I would use the JPersistenceAdapter,
serialize the data and store it on the master node, on
the web server or in a database and deserialize it
when the next request comes in.

Regards,
Jost Boekemeier



		
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i wanna return jl;

but it show me "object(Java)#2 (0) { } "

HOW CAN I DO?




php code:
package newjava;

public class array{

public String arr_s(String ar[]){




return ar[0]+ar[1];

}



public String[] s_arr(){

String ar[]={"m1","m2"};

return ar;

}



public int[] int_arr(){

int ar[]={1,2,3,4};

return ar;

}



public jl jl_arr(){

jl myjl=new jl("Shanghai",9);

return myjl;

}


}

java code1:
package newjava;
import java.lang.Object;
public class jl extends Object{
String s;
int i;
public jl(String s, int i){
this.s=s;
this.i=i;
}
}

java code2:
package newjava;

public class array{

public String arr_s(String ar[]){
return ar[0]+ar[1];
}

public String[] s_arr(){
String ar[]={"m1","m2"};
return ar;
}

public int[] int_arr(){
int ar[]={1,2,3,4};
return ar;
}

public jl jl_arr(){
jl myjl=new jl("Shanghai",9);
return myjl;
}


}