subject:"\[flexcoders\] many\-to\-many managed association in Hibernate destination"

RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-13 Thread Douglas McCarroll

Hi Jeff,

  I could not follow the code.txt
  link in your post

I wonder why that wouldn't work for you. Let's try again. I've posted 
the file again with a different name:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/code_2.txt

Can you see this one?

  I suspect that you are still missing the intermediate
  destination in the FDMS configuration. I apologize
  if I wasn’t clear

No, I think that you were clear, and believe that I've implemented the 
intermediate filmActors destination as suggested. Let me know how it looks.

I'd also be happy to give you the whole app so that you can run it if 
you'd like.

Thanks,

Douglas




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RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-12 Thread Jeff Vroom

Hi Douglas,

 

(snip)

 

3. Jeff said that I should set the association properties for my 

filmActors destination as one-to-one. I'm guessing that this should be 

many-to-one, but am not sure. I've tried both it doesn't help my current


problem, but I'd love a definitive answer on which this should be. 

Victor Rubba sent me some code that uses many-to-one for an intermediate


object (albeit one with numeric ID, rather than complex object ID like 

mine). This is working code so it seems to support my guess.

 

I could not follow the code.txt link in your post but I suspect that you
are still missing the intermediate destination in the FDMS
configuration.   I apologize if I wasn't clear, but in this case since
you have 3 entity types in hibernate (Film, FilmActor, and Actor) in
hibernate, you need three destinations in FDMS one for each entity type.
The actor type would have a filmActors association property which is
of type: one-to-many or maybe many-to-many (we actually treat those two
as the same... we only care about the to-many or to-one part of the
association).  This one should point to the filmActors destination.
The filmActors destination would have a film association property and
an actor association property - both of these would be one-to-one or
many-to-one.   Probably all association properties should be marked
lazy=true.   If you can provide access to your FDMS configuration
somehow, I'll take a look to make sure that looks right.

 

Unfortunately I can't easily send an updated version of the
HibernateAssembler since the current version depends on some new code we
added that is not yet released.  

 

Jeff

 

 

 

 

 

 

 

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Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-09 Thread Douglas McCarroll

Douglas McCarroll wrote:
Thanks. I'll let you know how it goes.

Still stuck. :-)

Same Page request made for item with id = '{filmId=null}' error.

I believe that I've implemented Jeff's suggestions.

I've refreshed this code listing so that it reflects my current code:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/code.txt

Here's my current logging output:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/debug_log_02.txt

Here's a nice variable view showing what HibernateAssembler.fill() returns:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/actor_destination_fill_result_at_app_startup.jpg

The comments and questions that follow are addressed to Jeff Vroom in
particular, but all are welcome to contribute...

1. Jeff explained a while back in this thread that FDMS and Hibernate
currently don't do lazy loading in the same way -
http://tech.groups.yahoo.com/group/flexcoders/message/57339 - I assume
that this explains why fill() is returning so much data on Films in what
is supposed to be a lazy fill() of Actors.

2. In any case, both the fill() results and the logging output - which I
believe shows the data being sent over the wire - show the associated
films as having a filmId of zero (in Java) or null (passed over the wire).

3. Jeff said that I should set the association properties for my
filmActors destination as one-to-one. I'm guessing that this should be
many-to-one, but am not sure. I've tried both it doesn't help my current
problem, but I'd love a definitive answer on which this should be.
Victor Rubba sent me some code that uses many-to-one for an intermediate
object (albeit one with numeric ID, rather than complex object ID like
mine). This is working code so it seems to support my guess.

4. I'm wondering what general approach I should take to resolving this.
Here are my options:

a. I can continue to post code and logs and hope that Jeff (or
someone else) spots my error or identifies a bug in FDMS.

b. I can dig in with the debugger. I'm already looking at
HibernateAssembler.java (thanks, Adobe, for making source public!). Now
it occurs to me that Hibernate itself is open source. Should I be
digging into that and trying to figure out why it's giving me Film
instances without ID values? This could be dangerous - I might learn
more Java! :-) Seriously, what's the likelihood that I could help to
resolve this problem by doing this, given that I have more time to put
into this than Jeff does?

c. I could re-zip the whole project and repost it if anyone else
would like to play with it.

d. Other suggestions?

e. All of the above? :-)

5. Jeff said, I think the hibernate assembler is missing an error test
for snip. I’ll fix that right away as that would have saved you a lot
of time.
Can I get a copy of the fixed code?

Finally, thanks to Jeff and to all for all your input so far.

Douglas

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Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-09 Thread Douglas McCarroll

PS. Be careful. I just checked the links in this post and the code page
was retrieved from my cache. The new version does *not* have and error
message at the top. Hit refresh if it does. :-)

Douglas

Douglas McCarroll wrote:
Douglas McCarroll wrote:

Thanks. I'll let you know how it goes.

Still stuck. :-)

Same Page request made for item with id = '{filmId=null}' error.

I believe that I've implemented Jeff's suggestions.

I've refreshed this code listing so that it reflects my current code:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/code.txt

Here's my current logging output:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/debug_log_02.txt

Here's a nice variable view showing what HibernateAssembler.fill() returns:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/actor_destination_fill_result_at_app_startup.jpg

The comments and questions that follow are addressed to Jeff Vroom in
particular, but all are welcome to contribute...

4. I'm wondering what general approach I should take to resolving this.
Here are my options:

a. I can continue to post code and logs and hope that Jeff (or
someone else) spots my error or identifies a bug in FDMS.

c. I could re-zip the whole project and repost it if anyone else
would like to play with it.

d. Other suggestions?

e. All of the above? :-)

5. Jeff said, I think the hibernate assembler is missing an error test
for snip. I’ll fix that right away as that would have saved you a lot
of time.
Can I get a copy of the fixed code?

Finally, thanks to Jeff and to all for all your input so far.

Douglas

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Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-04 Thread Douglas McCarroll

 more thing is that because 
 you are using a “complex” object type as an identity property, your 
 FilmActor.as class will need a function like:

 public function toString():String

 {

 return actorId + “:” + filmId

 }

 This is a requirement for complex object identity properties in FDMS 
 (due to the fact that there is no Hashtable like class in ActionScript 
 which uses equals/hashCode methods, we use a string key generated from 
 the toString values of all identity properties to keep track of 
 instances on the client).

 I think the hibernate assembler is missing an error test for the case 
 where the type of the referenced entity does not match the 
 destination’s entity type. I’ll fix that right away as that would have 
 saved you a lot of time. Instead, it is looking for a “filmId” 
 property on the FilmActor type and is getting back null (it should 
 also print an error instead here).

 One other thing I’ll mention as an aside is that you could potentially 
 implement the Film/Actors relationship without an intermediate 
 FilmActors class – both hibernate and FDMS will support that and since 
 you do not have any additional properties in the mapping table, it is 
 pretty common to avoid an extra type.

 You are right though that this fix will not greatly improve the 
 performance. We are still going to need to do a query for each actor 
 to retrieve the filmActors properties. It will be a little faster than 
 today because it won’t need to join in the Film table because of the 
 intermediate mapping object.

 Jeff

 

 *From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] 
 *On Behalf Of *Douglas McCarroll
 *Sent:* Thursday, November 30, 2006 5:39 PM
 *To:* flexcoders@yahoogroups.com
 *Subject:* Re: [flexcoders] many-to-many managed association in 
 Hibernate destination

 Hi Jeff,

 A couple more thoughts...

 It's worth noting that I don't get the error when I use the hierarchical
 values approach without lazy loading, and get my films info from my
 actor objects.

  Thanks for this info. The performance problem is most likely due to the
  fact that FDMS is fetching the list of films for each actor... this is
  the lazy loading issue we have currently that I mentioned in a previous
  post. If we were to follow the hibernate model more closely, we'd send
  actor instances to the client without having populated the list of
  films for each actor at all. The first get call made on the films
  property for a given actor would then go back to the server and fetch
  them. As it is now, we'll do one query to retrieve the list of actors,
  then a query for each actor to get its list of films. For a large DB,
  this is a lot of queries to do.

  This is a pretty high priority feature request. For now, the workaround
  would be to modify your domain model so there is an intermediate object
  but that is awkward when you are generating everything from the simple
  schema.

 I'm not sure that I understand this. I believe that I have an
 intermediate object - filmActor.java and filmActor.as.

 Are you suggesting that I use that object - or rather those objects - as
 a way of finding out what filmIds are related to an actorId? I.e. that I
 load them from their own destination? I'm tired so if this isn't clear,
 don't worry about it. :-)

 Do I understand correctly that until we get the fix lazy loading isn't
 necessarily going to solve any performance problems?

 Douglas

 Jeff Vroom wrote:
 
  Thanks for this info. The performance problem is most likely due to the
  fact that FDMS is fetching the list of films for each actor... this is
  the lazy loading issue we have currently that I mentioned in a previous
  post. If we were to follow the hibernate model more closely, we'd send
  actor instances to the client without having populated the list of
  films for each actor at all. The first get call made on the films
  property for a given actor would then go back to the server and fetch
  them. As it is now, we'll do one query to retrieve the list of actors,
  then a query for each actor to get its list of films. For a large DB,
  this is a lot of queries to do.
 
  This is a pretty high priority feature request. For now, the workaround
  would be to modify your domain model so there is an intermediate object
  but that is awkward when you are generating everything from the simple
  schema.
 
  As to why it is not working, from the output, the filmId of each Film
  object is getting sent to the client as a null value. I am not sure
  why... I can't tell if it is retrieving the values from the database as
  null or if FDMS is just not getting the values from the objects
  properly. It could have something to do with the short data type - I
  do not think we've tried id properties as short values so maybe
  something is getting messed up because of that? It might be worth
  changing that to an int if that is an easy test to run

RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-04 Thread Jeff Vroom

Hi Douglas,

I misspoke on one of my recommendations:

 One more thing is that because you are using a complex
 object type as an identity property, your FilmActor.as
 class will need a function like:
 public function toString():String
 {
 return actorId + : + filmId
 }

I meant to say add this to the FilmActorId.as class.  Sorry about that! 

 Two more questions:

 1. This would be so much easier if I had a working example to work
from. 
 I haven't found any examples that use the 'managed associations' 
 approach - with one-to-many or many-to-many relationships. Jeff, do
you 
 know of any? Does anyone?

Let me see if I can dig something up.  We have a few applications folks
built internally here that use hibernate with managed associations.  It
may take a bit of cleaning up to get it so they can be given out. 

 2. Victor Rubba has been kind enough to show me some code that he has 
 that implements a many-to-many relationship with a link table. His
link 
 table has a numeric id column, which allows his code to avoid the
whole 
 complex id issue. Thus his destination config avoids 'composite-id'.

 Everything is much simpler. :-) (!) But we're wondering if this
approach 
 is correct, or if it's more correct to have a link table that only 
 contains IDs from the linked tables, i.e. a composite ID.

Both of those approaches work and so are correct in a certain sense.
Probably most DBAs would prefer the link table which only has the ids
from the linked tables since that extra id column is not strictly
necessary.  Note that FDMS supports Java/Actionscript objects which have
more than one id property but I think hibernate requires that all id
columns are stored in the same property in Java.  I am not sure about
that...

Jeff

-Original Message-
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Douglas McCarroll
Sent: Monday, December 04, 2006 6:00 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] many-to-many managed association in Hibernate
destination

Hi Jeff,

  Ok, so I think I see the problem then...

Thanks for the response. I'm having some trouble applying this to my 
particular case and would like to check a bit to make sure that we're on

the same page.


Here's my question:



If I run HibernateTools on a many-to-many table relationship with a link

table - as shown here: 
http://www.brightworks.com/technology/tech_questions/hibernate_lazy_asso
ciations/index.html 
- it creates a Java file like this:



FilmActor.java

package com.brightworks.apps.dvd_store;

import java.util.Date;

public class FilmActor {

private FilmActorId id;
private Film film;
private Actor actor;
private Date lastUpdate;

public FilmActor() {
}

public FilmActor(FilmActorId id, Film film, Actor actor, Date
lastUpdate) {
this.id = id;
this.film = film;
this.actor = actor;
this.lastUpdate = lastUpdate;
}

public FilmActorId getId() {
return this.id;
}

public void setId(FilmActorId id) {
this.id = id;
}

public Film getFilm() {
return this.film;
}

public void setFilm(Film film) {
this.film = film;
}

public Actor getActor() {
return this.actor;
}

public void setActor(Actor actor) {
this.actor = actor;
}

public Date getLastUpdate() {
return this.lastUpdate;
}

public void setLastUpdate(Date lastUpdate) {
this.lastUpdate = lastUpdate;
}

}




The link table uses actor_id and film_id columns to link to the other 
two tables.

But a FilmActor.java instance has:

a) References to the Actor and Film instances that it is linking
b) An instance of FilmActorId.java. This class obviously acts as the 
ID for FilmActor.java and contains ActorId and FilmId values. It's 
described in the mapping file like this:


composite-id
name=id
class=com.brightworks.apps.dvd_store.FilmActorId
key-property
name=actorId
type=short
column name=actor_id /
/key-property
key-property
name=filmId
type=short
column name=film_id /
/key-property
/composite-id



You wrote:

  One more thing is that because you are using a complex
  object type as an identity property, your FilmActor.as
  class will need a function like:

When you say complex object type I assume that you're referring
to FilmActorId. Am I correct so far?

But I run into a problem here:

  public function toString():String
  {
  return actorId + : + filmId
  }


My FilmActor.as looks like this:


package com.brightworks.apps.dvd_store.vo
{
[Managed]
[RemoteClass(alias=com.brightworks.apps.dvd_store.FilmActor)]

public class FilmActor
{
public function FilmActor() {}

public var filmActorId:FilmActorId;
public var film:Film;
public var actor:Actor;
public var lastUpdate:Date;
}
}


I wrote it to simply reflect FilmActor.java's structure.

It has no actorId or filmId, so I can't do return actorId + : +
filmId

I could add these properties, but I don't see how/why they'd get int 
values from FilmActor.java. Would FDMS or Hibernate know enough to pull 
them out of the FilmActor.java's complex ID?

  you could potentially implement the Film/Actors

RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-04 Thread Jeff Vroom

*  Do I need a fourth destination for the FilmActorID class?

 

Nope, that instance is managed by the FilmActor destination.   It does
not have its own id so it can't be in a separate destination. 

 

Jeff

Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-04 Thread Douglas McCarroll

Thanks. I'll let you know how it goes.


Jeff Vroom wrote:

 Ø Do I need a fourth destination for the FilmActorID class?

 Nope, that instance is managed by the FilmActor destination. It does 
 not have its own “id” so it can’t be in a separate destination.

 Jeff

  



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RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-12-03 Thread Jeff Vroom

Hi Douglas,

 

Ok, so I think I see the problem then - my apologies for not seeing it
sooner.   The FDMS destination does not have a destination for the
filmActors type.   Also, the property: Actor.filmActors has this
association tag:

 

many-to-many 

property=filmActors

destination=film.hibernate 

lazy=true /

 

it should instead refer to the new filmActors.hibernate destination you
would add.   This type would have its identity property with the name
id and would have lazy one-to-one association properties both for
film and actor which refer to the destinations film.hibernate and
actor.hibernate.   One more thing is that because you are using a
complex object type as an identity property, your FilmActor.as class
will need a function like:

 

   public function toString():String

   {

   return actorId + : + filmId

   }

 

This is a requirement for complex object identity properties in FDMS
(due to the fact that there is no Hashtable like class in ActionScript
which uses equals/hashCode methods, we use a string key generated from
the toString values of all identity properties to keep track of
instances on the client).

 

I think the hibernate assembler is missing an error test for the case
where the type of the referenced entity does not match the destination's
entity type.  I'll fix that right away as that would have saved you a
lot of time.  Instead, it is looking for a filmId property on the
FilmActor type and is getting back null (it should also print an error
instead here). 

 

One other thing I'll mention as an aside is that you could potentially
implement the Film/Actors relationship without an intermediate
FilmActors class - both hibernate and FDMS will support that and since
you do not have any additional properties in the mapping table, it is
pretty common to avoid an extra type. 

 

You are right though that this fix will not greatly improve the
performance.  We are still going to need to do a query for each actor to
retrieve the filmActors properties.  It will be a little faster than
today because it won't need to join in the Film table because of the
intermediate mapping object.

 

Jeff 

 



From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Douglas McCarroll
Sent: Thursday, November 30, 2006 5:39 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] many-to-many managed association in Hibernate
destination

 

Hi Jeff,

A couple more thoughts...

It's worth noting that I don't get the error when I use the hierarchical

values approach without lazy loading, and get my films info from my 
actor objects.

 Thanks for this info. The performance problem is most likely due to
the
 fact that FDMS is fetching the list of films for each actor... this is
 the lazy loading issue we have currently that I mentioned in a
previous
 post. If we were to follow the hibernate model more closely, we'd send
 actor instances to the client without having populated the list of
 films for each actor at all. The first get call made on the films
 property for a given actor would then go back to the server and fetch
 them. As it is now, we'll do one query to retrieve the list of actors,
 then a query for each actor to get its list of films. For a large DB,
 this is a lot of queries to do.

 This is a pretty high priority feature request. For now, the
workaround
 would be to modify your domain model so there is an intermediate
object
 but that is awkward when you are generating everything from the simple
 schema.

I'm not sure that I understand this. I believe that I have an 
intermediate object - filmActor.java and filmActor.as.

Are you suggesting that I use that object - or rather those objects - as

a way of finding out what filmIds are related to an actorId? I.e. that I

load them from their own destination? I'm tired so if this isn't clear, 
don't worry about it. :-)

Do I understand correctly that until we get the fix lazy loading isn't 
necessarily going to solve any performance problems?

Douglas

Jeff Vroom wrote:

 Thanks for this info. The performance problem is most likely due to
the
 fact that FDMS is fetching the list of films for each actor... this is
 the lazy loading issue we have currently that I mentioned in a
previous
 post. If we were to follow the hibernate model more closely, we'd send
 actor instances to the client without having populated the list of
 films for each actor at all. The first get call made on the films
 property for a given actor would then go back to the server and fetch
 them. As it is now, we'll do one query to retrieve the list of actors,
 then a query for each actor to get its list of films. For a large DB,
 this is a lot of queries to do.

 This is a pretty high priority feature request. For now, the
workaround
 would be to modify your domain model so there is an intermediate
object
 but that is awkward when you

Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-30 Thread Douglas McCarroll

Hi Jeff,

A couple more thoughts...

It's worth noting that I don't get the error when I use the hierarchical 
values approach without lazy loading, and get my films info from my 
actor objects.

  Thanks for this info. The performance problem is most likely due to the
  fact that FDMS is fetching the list of films for each actor... this is
  the lazy loading issue we have currently that I mentioned in a previous
  post. If we were to follow the hibernate model more closely, we'd send
  actor instances to the client without having populated the list of
  films for each actor at all. The first get call made on the films
  property for a given actor would then go back to the server and fetch
  them. As it is now, we'll do one query to retrieve the list of actors,
  then a query for each actor to get its list of films. For a large DB,
  this is a lot of queries to do.

  This is a pretty high priority feature request. For now, the workaround
  would be to modify your domain model so there is an intermediate object
  but that is awkward when you are generating everything from the simple
  schema.

I'm not sure that I understand this. I believe that I have an 
intermediate object - filmActor.java and filmActor.as.

Are you suggesting that I use that object - or rather those objects - as 
a way of finding out what filmIds are related to an actorId? I.e. that I 
load them from their own destination? I'm tired so if this isn't clear, 
don't worry about it. :-)

Do I understand correctly that until we get the fix lazy loading isn't 
necessarily going to solve any performance problems?

Douglas




Jeff Vroom wrote:

 Thanks for this info. The performance problem is most likely due to the
 fact that FDMS is fetching the list of films for each actor... this is
 the lazy loading issue we have currently that I mentioned in a previous
 post. If we were to follow the hibernate model more closely, we'd send
 actor instances to the client without having populated the list of
 films for each actor at all. The first get call made on the films
 property for a given actor would then go back to the server and fetch
 them. As it is now, we'll do one query to retrieve the list of actors,
 then a query for each actor to get its list of films. For a large DB,
 this is a lot of queries to do.

 This is a pretty high priority feature request. For now, the workaround
 would be to modify your domain model so there is an intermediate object
 but that is awkward when you are generating everything from the simple
 schema.

 As to why it is not working, from the output, the filmId of each Film
 object is getting sent to the client as a null value. I am not sure
 why... I can't tell if it is retrieving the values from the database as
 null or if FDMS is just not getting the values from the objects
 properly. It could have something to do with the short data type - I
 do not think we've tried id properties as short values so maybe
 something is getting messed up because of that? It might be worth
 changing that to an int if that is an easy test to run.

 I will try to get a chance to look at this more tomorrow.

 Jeff

 -Original Message-
 From: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com 
 [mailto:flexcoders@yahoogroups.com 
 mailto:flexcoders%40yahoogroups.com] On
 Behalf Of Douglas McCarroll
 Sent: Wednesday, November 29, 2006 11:26 AM
 To: flexcoders@yahoogroups.com mailto:flexcoders%40yahoogroups.com
 Subject: Re: [flexcoders] many-to-many managed association in Hibernate
 destination

 Jeff Vroom wrote:

  4) If you turn on debug logging in the server for
  the Endpoint.* logging category, you'll see the
  object graph which is sent to the client after
  your fill. I am curious if the time is being
  spent loading the data from the database or
  sending data to the client, or a combination of
  both.

 Okay, I've figured out how to do this part. Results here:

 http://www.brightworks.com/technology/tech_questions/hibernate_lazy_asso 
 http://www.brightworks.com/technology/tech_questions/hibernate_lazy_asso
 ciations/debug_log_01.txt

  If you can also turn on debug logging of the SQL
  that hibernate is using that would help figure out
  if we are just fetching too many objects or what.

 It looks as though I do this by adding a line to
 HibernateManager.java...

 public void createSessionFactory(Configuration hibernateConfig,
 boolean useTransactions) throws ExceptionInInitializerError
 {
 try
 {

 New Line - hibernateConfig.setProperty(hibernate.show_sql, true)

 sessionFactory = hibernateConfig.buildSessionFactory();

 Yes?

 BTW, in case someone finds this someday with Google, here are some
 resources:

 FDS Logging:

 http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/ww 
 http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/ww
 help.htm?context=LiveDocs_Partsfile=1112.html

 http://weblogs.macromedia.com/dharfleet/archives/2006/08/debugging_flex. 
 http

Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-29 Thread Douglas McCarroll

Jeff Vroom wrote:

  4) If you turn on debug logging in the server for
  the “Endpoint.*” logging category, you’ll see the
  object graph which is sent to the client after
  your fill. I am curious if the time is being
  spent loading the data from the database or
  sending data to the client, or a combination of
  both.

Okay, I've figured out how to do this part. Results here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/debug_log_01.txt


  If you can also turn on debug logging of the SQL
  that hibernate is using that would help figure out
  if we are just fetching too many objects or what.

It looks as though I do this by adding a line to HibernateManager.java...


public void createSessionFactory(Configuration hibernateConfig,
boolean useTransactions) throws ExceptionInInitializerError
{
try
{

New Line - hibernateConfig.setProperty(hibernate.show_sql, true)

sessionFactory = hibernateConfig.buildSessionFactory();


Yes?






BTW, in case someone finds this someday with Google, here are some 
resources:


FDS Logging:

http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Partsfile=1112.html

http://weblogs.macromedia.com/dharfleet/archives/2006/08/debugging_flex.cfm

http://tech.groups.yahoo.com/group/flexcoders/message/56192


Hibernate Logging:

http://www.javalobby.org/java/forums/t44119.html










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FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
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RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-29 Thread Jeff Vroom

Thanks for this info.  The performance problem is most likely due to the
fact that FDMS is fetching the list of films for each actor... this is
the lazy loading issue we have currently that I mentioned in a previous
post.  If we were to follow the hibernate model more closely, we'd send
actor instances to the client without having populated the list of
films for each actor at all.  The first get call made on the films
property for a given actor would then go back to the server and fetch
them.  As it is now, we'll do one query to retrieve the list of actors,
then a query for each actor to get its list of films.  For a large DB,
this is a lot of queries to do.

This is a pretty high priority feature request.  For now, the workaround
would be to modify your domain model so there is an intermediate object
but that is awkward when you are generating everything from the simple
schema. 

As to why it is not working, from the output, the filmId of each Film
object is getting sent to the client as a null value.  I am not sure
why... I can't tell if it is retrieving the values from the database as
null or if FDMS is just not getting the values from the objects
properly.  It could have something to do with the short data type - I
do not think we've tried id properties as short values so maybe
something is getting messed up because of that?  It might be worth
changing that to an int if that is an easy test to run.

I will try to get a chance to look at this more tomorrow.

Jeff

-Original Message-
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Douglas McCarroll
Sent: Wednesday, November 29, 2006 11:26 AM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] many-to-many managed association in Hibernate
destination

Jeff Vroom wrote:

  4) If you turn on debug logging in the server for
  the Endpoint.* logging category, you'll see the
  object graph which is sent to the client after
  your fill. I am curious if the time is being
  spent loading the data from the database or
  sending data to the client, or a combination of
  both.

Okay, I've figured out how to do this part. Results here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_asso
ciations/debug_log_01.txt


  If you can also turn on debug logging of the SQL
  that hibernate is using that would help figure out
  if we are just fetching too many objects or what.

It looks as though I do this by adding a line to
HibernateManager.java...


public void createSessionFactory(Configuration hibernateConfig,
boolean useTransactions) throws ExceptionInInitializerError
{
try
{

New Line - hibernateConfig.setProperty(hibernate.show_sql, true)

sessionFactory = hibernateConfig.buildSessionFactory();


Yes?






BTW, in case someone finds this someday with Google, here are some 
resources:


FDS Logging:

http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/ww
help.htm?context=LiveDocs_Partsfile=1112.html

http://weblogs.macromedia.com/dharfleet/archives/2006/08/debugging_flex.
cfm

http://tech.groups.yahoo.com/group/flexcoders/message/56192


Hibernate Logging:

http://www.javalobby.org/java/forums/t44119.html










--
Flexcoders Mailing List
FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
Search Archives:
http://www.mail-archive.com/flexcoders%40yahoogroups.com 
Yahoo! Groups Links

[flexcoders] many-to-many managed association in Hibernate destination

2006-11-28 Thread Douglas McCarroll

Hi All,

This is essentially a repost of my How to implement Lazy Hibernate?
question.

I'm still completely stuck. Here's the error message I'm getting:

[RPC Fault faultString=Page request made for item with id =
'{filmId=null}'. The item was not in the cache and the adapter's get
method failed to return the item for destination = film.hibernate that
is expected to be in the requested page. faultCode=Server.Processing
faultDetail=null]

Here's the big picture:

I'm attempting to create a Cairngorm/FDMS/Hibernate/MySQL example program.

I have three tables. 'actor' and 'film' have a many-to-many relationship
so they're connected by a link table 'film_actor'.

I've used HibernateTools to create .java and .hbm.xml classes by reverse
engineering the DB. I assume the HibernateTools knows what it is doing
so I'm assuming that the generated code is correct.

And I've successfully implemented .as classes and
data-management-config.xml and displayed data. I can click on an actor
and display the films that s/he's in. This all works through a single
destination that uses my Actor.java class. This uses the 'hierarchical
values' approach to managing hierarchical collections, i.e. just using
the 'actor' destination.

This approach is problematic because there are circular references
between Actor and Film objects. It seems to me that the obvious solution
is lazy loading. I don't see anything in the docs explaining how to do
this with the hierarchical values approach, so I'm attempting to use a
'lazy' managed associations approach. But I get the above error.

Someone who knows FDMS might be able to look at my code and fairly
easily point me in the right direction.

I've zipped up the entire project - plus a .sql file you can use to
create my MySQL DB - and put them up for download:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/Bw_005.zip

Or, you can just look at the code here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/code.txt

The DB's schema is here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/index.html

And here's a lovely variables view of the circular references I'm trying
to avoid :-) :

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/deeply_nested_actors_and_films.jpg

Help?

Douglas

Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-28 Thread Richard Rodseth

I'm not currently using Flex, but I don't believe it's possible to map
ActionScript classes to lazily-loaded Hibernate classes because of all the
hibernate proxy stuff. I was under the impression that you have to use DTOs,
rather than mapping your client classes to your domain objects. Am I wrong?

- Richard

On 11/28/06, Douglas McCarroll [EMAIL PROTECTED]
wrote:

Hi All,

This is essentially a repost of my How to implement Lazy Hibernate?
question.

I'm still completely stuck. Here's the error message I'm getting:

Here's the big picture:

I'm attempting to create a Cairngorm/FDMS/Hibernate/MySQL example program.

I have three tables. 'actor' and 'film' have a many-to-many relationship
so they're connected by a link table 'film_actor'.

I've used HibernateTools to create .java and .hbm.xml classes by reverse
engineering the DB. I assume the HibernateTools knows what it is doing
so I'm assuming that the generated code is correct.

Someone who knows FDMS might be able to look at my code and fairly
easily point me in the right direction.

I've zipped up the entire project - plus a .sql file you can use to
create my MySQL DB - and put them up for download:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/Bw_005.zip

Or, you can just look at the code here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/code.txt

The DB's schema is here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/index.html

And here's a lovely variables view of the circular references I'm trying
to avoid :-) :

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/deeply_nested_actors_and_films.jpg

Help?

Douglas

Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-28 Thread Douglas McCarroll

Hi Richard,

I was under the impression that you have to use DTOs, rather
than mapping your client classes to your domain objects.

I Google flex hibernate lazy and I find this:

http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Partsfile=1201.html

It includes config code that looks like this:

destination id=HibernatePerson channels=rtmp-ac
adapter ref=java-adapter /
properties
sourceflex.data.assemblers.HibernateAssembler/source
scopeapplication/scope
metadata
identity property=id/
many-to-one property=group
destination=HibernateGroup lazy=true/
/metadata

This looks like they're mapping directly to a domain object, yes?

Douglas

Richard Rodseth wrote:

I'm not currently using Flex, but I don't believe it's possible to map
ActionScript classes to lazily-loaded Hibernate classes because of all
the hibernate proxy stuff. I was under the impression that you have to
use DTOs, rather than mapping your client classes to your domain
objects. Am I wrong?

- Richard

On 11/28/06, *Douglas McCarroll*
[EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:

Hi All,

This is essentially a repost of my How to implement Lazy Hibernate?
question.

I'm still completely stuck. Here's the error message I'm getting:

[RPC Fault faultString=Page request made for item with id =
'{filmId=null}'. The item was not in the cache and the adapter's get
method failed to return the item for destination = film.hibernate
that
is expected to be in the requested page.
faultCode=Server.Processing
faultDetail=null]

Here's the big picture:

I'm attempting to create a Cairngorm/FDMS/Hibernate/MySQL example
program.

I have three tables. 'actor' and 'film' have a many-to-many
relationship
so they're connected by a link table 'film_actor'.

I've used HibernateTools to create .java and .hbm.xml classes by
reverse
engineering the DB. I assume the HibernateTools knows what it is
doing
so I'm assuming that the generated code is correct.

And I've successfully implemented .as classes and
data-management-config.xml and displayed data. I can click on an
actor
and display the films that s/he's in. This all works through a single
destination that uses my Actor.java class. This uses the
'hierarchical
values' approach to managing hierarchical collections, i.e. just
using
the 'actor' destination.

This approach is problematic because there are circular references
between Actor and Film objects. It seems to me that the obvious
solution
is lazy loading. I don't see anything in the docs explaining how
to do
this with the hierarchical values approach, so I'm attempting to
use a
'lazy' managed associations approach. But I get the above error.

Someone who knows FDMS might be able to look at my code and fairly
easily point me in the right direction.

I've zipped up the entire project - plus a .sql file you can use to
create my MySQL DB - and put them up for download:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/Bw_005.zip

Or, you can just look at the code here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/code.txt

The DB's schema is here:

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/index.html

And here's a lovely variables view of the circular references I'm
trying
to avoid :-) :

http://www.brightworks.com/technology/tech_questions/hibernate_lazy_associations/deeply_nested_actors_and_films.jpg

Help?

Douglas

RE: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-28 Thread Jeff Vroom

Sorry for not chiming in sooner - I was on vacation the last couple of
days.

 

I'm afraid I haven't had a chance to look at the code you posted but I
have a few comments that will hopefully help.

 

1)   The HibernateAssembler does have some logic to deal with
hibernate's generated proxy classes when you are using FDMS with
hibernate.  This involves two parts: 1) pre-fetching any lazily loaded
data that we will need to serialize to the client and 2) unwrapping the
proxied classes so that the class names are properly mapped if you are
using strongly typed AS classes to map to your hibernate domain model
classes.   We need to do 1) so that hibernate has loaded all of the
object's state that the client requires while the transaction is still
open.  This also allows us to unwrap the proxies during deserialization
since we know all of the state we need will have been fetched in the
wrapped implementation instance.   There is a performance issue with the
code that implements 1) in that currently hibernate's lazy loading and
FDMS's lazy loading are a little different for multi-valued properties
and this could be contributing to your performance problem.   Basically,
weFDMS needs to prefetch the value of the multi-valued association
property even when the property is marked with lazy=true in your FDMS
configuration.  This is because FDMS wants to send the ids of the
referenced objects down with the state of the parent object... hibernate
initially does not fetch any values in the multi-valued association
property and when you first retrieve the collection it gets all of the
data in the collection.  We have an open enhancement request to support
a model for FDMS which matches hibernate's to make this more efficient.


2)   We should support bi-directional references in your object
graph though it is a good practice to ensure all back ptrs are marked
with lazy=true in the FDMS configuration. 

3)   In the flex-builder variables view you sent in the screen-shot,
keep in mind that flexbuilder is not good at letting you know when you
have hit a recursive ptr in the variables view.  It looks to me like you
are seeing the same objects over and over again rather than seeing a
huge tree that is being sent to the client (you can match up the
addresses flexbuilder displays for each object to detect this yourself).

4)   If you turn on debug logging in the server for the Endpoint.*
logging category, you'll see the object graph which is sent to the
client after your fill.  I am curious if the time is being spent loading
the data from the database or sending data to the client, or a
combination of both.  If you can also turn on debug logging of the SQL
that hibernate is using that would help figure out if we are just
fetching too many objects or what.  

 

I'll hopefully get a chance to look into the test case in more detail
later.  Regards,

 

Jeff

 



From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Douglas McCarroll
Sent: Tuesday, November 28, 2006 3:19 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] many-to-many managed association in Hibernate
destination

 

Hi Richard,

 I was under the impression that you have to use DTOs, rather
 than mapping your client classes to your domain objects.

I Google flex hibernate lazy and I find this:

http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/ww
help.htm?context=LiveDocs_Partsfile=1201.html
http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/w
whelp.htm?context=LiveDocs_Partsfile=1201.html 

It includes config code that looks like this:

destination id=HibernatePerson channels=rtmp-ac
adapter ref=java-adapter /
properties
sourceflex.data.assemblers.HibernateAssembler/source
scopeapplication/scope
metadata
identity property=id/
many-to-one property=group
destination=HibernateGroup lazy=true/ 
/metadata 

This looks like they're mapping directly to a domain object, yes?

Douglas

Richard Rodseth wrote:

 I'm not currently using Flex, but I don't believe it's possible to map

 ActionScript classes to lazily-loaded Hibernate classes because of all

 the hibernate proxy stuff. I was under the impression that you have to

 use DTOs, rather than mapping your client classes to your domain 
 objects. Am I wrong?

 - Richard

 On 11/28/06, *Douglas McCarroll* 
 [EMAIL PROTECTED]
mailto:org.yahoo_primary.001%40douglasmccarroll.com  
 mailto:[EMAIL PROTECTED]
mailto:org.yahoo_primary.001%40douglasmccarroll.com  wrote:

 Hi All,

 This is essentially a repost of my How to implement Lazy Hibernate?
 question.

 I'm still completely stuck. Here's the error message I'm getting:

 [RPC Fault faultString=Page request made for item with id =
 '{filmId=null}'. The item was not in the cache and the adapter's get
 method failed to return the item for destination = film.hibernate
 that
 is expected to be in the requested page.
 faultCode=Server.Processing

Re: [flexcoders] many-to-many managed association in Hibernate destination

2006-11-28 Thread Douglas McCarroll

Hi Jeff,

Thanks for your response!

I'm going to take a while to absorb (1) and (2) but here's a quick
response for (3) and (4).

(3)

It looks to me like you are seeing the same objects
over and over again rather than seeing a huge tree

Yes, absolutely. I'd noticed that that was the case.

And I assume that the fact that they are the same objects referenced
over and over limits the damage.

Instead of huge numbers of objects we just have huge numbers of
references? Or maybe we don't - I guess that we're just seeing the same
references over and over again too.

But something is slowing the app down big-time. I've pared the number of
records in the DB down to hundreds per table so that it loads in a few
seconds, but with thousands of records and non-lazy
hierarchical-data-approach it was taking over 30 seconds to load...

(4)

Can you give me a few details on how to turn on these two types of
debugging?

Even just file names would help - then I can Google/research the details
- and ask again if I get stuck. :-)

Thanks,

Douglas

Jeff Vroom wrote:

Sorry for not chiming in sooner – I was on vacation the last couple of
days.

I’m afraid I haven’t had a chance to look at the code you posted but I
have a few comments that will hopefully help.

1) The HibernateAssembler does have some logic to deal with
hibernate’s generated proxy classes when you are using FDMS with
hibernate. This involves two parts: 1) pre-fetching any lazily loaded
data that we will need to serialize to the client and 2) unwrapping
the proxied classes so that the class names are properly mapped if you
are using strongly typed AS classes to map to your hibernate domain
model classes. We need to do 1) so that hibernate has loaded all of
the object’s state that the client requires while the transaction is
still open. This also allows us to unwrap the proxies during
deserialization since we know all of the state we need will have been
fetched in the wrapped implementation instance. There is a performance
issue with the code that implements 1) in that currently hibernate’s
lazy loading and FDMS’s lazy loading are a little different for
multi-valued properties and this could be contributing to your
performance problem. Basically, we FDMS needs to prefetch the value of
the multi-valued association property even when the property is marked
with lazy=”true” in your FDMS configuration. This is because FDMS
wants to send the ids of the referenced objects down with the state of
the parent object… hibernate initially does not fetch any values in
the multi-valued association property and when you first retrieve the
collection it gets all of the data in the collection. We have an open
enhancement request to support a model for FDMS which matches
hibernate’s to make this more efficient.

2) We should support bi-directional references in your object graph
though it is a good practice to ensure all “back ptrs” are marked with
lazy=”true” in the FDMS configuration.

3) In the flex-builder variables view you sent in the screen-shot,
keep in mind that flexbuilder is not good at letting you know when you
have hit a recursive ptr in the variables view. It looks to me like
you are seeing the same objects over and over again rather than seeing
a huge tree that is being sent to the client (you can match up the
addresses flexbuilder displays for each object to detect this yourself).

4) If you turn on debug logging in the server for the “Endpoint.*”
logging category, you’ll see the object graph which is sent to the
client after your fill. I am curious if the time is being spent
loading the data from the database or sending data to the client, or a
combination of both. If you can also turn on debug logging of the SQL
that hibernate is using that would help figure out if we are just
fetching too many objects or what.

I’ll hopefully get a chance to look into the test case in more detail
later. Regards,

Jeff

*From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED]
*On Behalf Of *Douglas McCarroll
*Sent:* Tuesday, November 28, 2006 3:19 PM
*To:* flexcoders@yahoogroups.com
*Subject:* Re: [flexcoders] many-to-many managed association in
Hibernate destination

Hi Richard,

I was under the impression that you have to use DTOs, rather
than mapping your client classes to your domain objects.

I Google flex hibernate lazy and I find this:

http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Partsfile=1201.html

It includes config code that looks like this:

destination id=HibernatePerson channels=rtmp-ac
adapter ref=java-adapter /
properties
sourceflex.data.assemblers.HibernateAssembler/source

RE: [flexcoders] many-to-many managed association in Hibernate destination

RE: [flexcoders] many-to-many managed association in Hibernate destination

Re: [flexcoders] many-to-many managed association in Hibernate destination

Re: [flexcoders] many-to-many managed association in Hibernate destination

Re: [flexcoders] many-to-many managed association in Hibernate destination

RE: [flexcoders] many-to-many managed association in Hibernate destination

RE: [flexcoders] many-to-many managed association in Hibernate destination

Re: [flexcoders] many-to-many managed association in Hibernate destination

RE: [flexcoders] many-to-many managed association in Hibernate destination

Re: [flexcoders] many-to-many managed association in Hibernate destination

Re: [flexcoders] many-to-many managed association in Hibernate destination

RE: [flexcoders] many-to-many managed association in Hibernate destination

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Re: [flexcoders] many-to-many managed association in Hibernate destination

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